Top 150 NEET physics MCQs With Detailed Answers

Top 150 NEET Physics MCQs With Detailed Answers | Best Practice Questions for NEET 2025

Boost your NEET preparation with our comprehensive collection of Top 150 NEET Physics MCQs designed to cover all important topics. Each question comes with detailed answers and explanations to help you understand key concepts deeply and improve your problem-solving skills. Whether you're revising Mechanics, Thermodynamics, Optics, or Electrodynamics, these expertly crafted multiple-choice questions are perfect for mastering NEET Physics.

Prepare effectively for the NEET 2025 exam with our carefully curated MCQs that follow the latest NEET syllabus and pattern. Access high-quality, NEET Physics practice questions to enhance your confidence and score higher marks.

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Top 150 NEET Physics MCQs With Detailed Answers

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Introduction

Preparing for NEET requires a strong grasp of Physics concepts and practicing multiple-choice questions (MCQs) regularly. This compilation of Top 150 NEET Physics MCQs with Detailed Answers is designed to help aspirants strengthen their concepts, improve speed, and boost confidence for the exam day. Each question is accompanied by an in-depth explanation to ensure clarity and deeper understanding.

Mechanics
Thermodynamics
Electrodynamics
Optics
Modern Physics

Sample MCQs

Mechanics

Q1. A block of mass 2 kg is sliding down a frictionless inclined plane of angle 30°. What is the acceleration of the block?
a) 9.8 m/s²
b) 4.9 m/s²
c) 5.0 m/s²
d) 3.2 m/s²

Answer: b) 4.9 m/s²

Explanation:
Acceleration along the incline, $a = g \sin \theta$
Given, $g = 9.8 \, m/s^2$ , $\theta = 30^\circ$
So, $a = 9.8 \times \sin 30^\circ = 9.8 \times \frac{1}{2} = 4.9 \, m/s^2$ .

Q2. A particle is moving in a circular path of radius 5 m with a constant speed of 10 m/s. What is the centripetal acceleration?
a) 10 m/s²
b) 15 m/s²
c) 20 m/s²
d) 25 m/s²

Answer: d) 20 m/s²

Explanation:
Centripetal acceleration, $a_c = \frac{v^2}{r}$
Here, $v = 10 \, m/s$ , $r = 5 \, m$
$a_c = \frac{10^2}{5} = \frac{100}{5} = 20 \, m/s^2$ .

Thermodynamics

Q3. The specific heat capacity of a gas at constant volume is $C_v$ . The gas is heated at constant pressure. The molar heat capacity at constant pressure $C_p$ is related to $C_v$ as:
a) $C_p = C_v$
b) $C_p = C_v + R$
c) $C_p = C_v - R$
d) $C_p = 2 C_v$

Answer: b) $C_p = C_v + R$

Explanation:
For an ideal gas, the relation between heat capacities is given by:
$C_p - C_v = R$
So, $C_p = C_v + R$ .

Electrodynamics

Q4. The resistance of a wire depends on:
a) Length only
b) Cross-sectional area only
c) Material and temperature only
d) Length, cross-sectional area, material, and temperature

Answer: d) Length, cross-sectional area, material, and temperature

Explanation:
Resistance $R$ is given by:
$R = \rho \frac{L}{A}$
where $\rho$ is resistivity (depends on material and temperature), $L$ is length, and $A$ is cross-sectional area. Hence all factors affect resistance.

Optics

Q5. The focal length of a concave lens is -20 cm. An object is placed at 30 cm from the lens. The image formed is:
a) Real, inverted, and magnified
b) Virtual, erect, and diminished
c) Real, erect, and magnified
d) Virtual, inverted, and magnified

Answer: b) Virtual, erect, and diminished

Explanation:
For a concave lens, focal length $f$ is negative. The image formed by a concave lens is always virtual, erect, and diminished regardless of the object distance.

Modern Physics

Q6. The photoelectric effect proves that light behaves as:
a) Wave only
b) Particle only
c) Both wave and particle
d) Neither wave nor particle

Answer: c) Both wave and particle

Explanation:
Photoelectric effect demonstrates the particle nature of light (photons), while other phenomena (interference, diffraction) show its wave nature. Hence, light exhibits dual nature.

Conclusion

This collection of Top 150 NEET Physics MCQs with detailed answers covers every major topic in the NEET syllabus and will enhance your problem-solving skills effectively. Regular practice and thorough understanding of these questions will help you achieve excellent scores in the Physics section of NEET.

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Mechanics (Continued)

Q7. A body is thrown vertically upward with velocity 20 m/s. What is the time taken to reach the highest point?
a) 2 s
b) 4 s
c) 10 s
d) 20 s

Answer: a) 2 s

Explanation:
At the highest point, velocity $v = 0$ .
Using equation $v = u - g t$ ,
$0 = 20 - 9.8 t \Rightarrow t = \frac{20}{9.8} \approx 2 \, s$ .

Q8. The work done by a conservative force along a closed path is:
a) Positive
b) Negative
c) Zero
d) Infinite

Answer: c) Zero

Explanation:
By definition, work done by a conservative force in any closed path is zero because the force depends only on initial and final positions.

Thermodynamics (Continued)

Q9. An ideal gas expands adiabatically. Which of the following is true?
a) Temperature remains constant
b) Pressure remains constant
c) No heat exchange with surroundings
d) Volume remains constant

Answer: c) No heat exchange with surroundings

Explanation:
In an adiabatic process, $Q = 0$ , meaning no heat is exchanged with surroundings.

Q10. The efficiency of a Carnot engine depends on:
a) Temperature of the hot reservoir only
b) Temperature of the cold reservoir only
c) Temperature difference between hot and cold reservoirs
d) Temperatures of both hot and cold reservoirs

Answer: d) Temperatures of both hot and cold reservoirs

Explanation:
Carnot engine efficiency,

\eta = 1 - \frac{T_C}{T_H}

where $T_H$ and $T_C$ are absolute temperatures of hot and cold reservoirs respectively.

Electrodynamics (Continued)

Q11. The SI unit of electric field is:
a) Volt (V)
b) Newton (N)
c) Newton per coulomb (N/C)
d) Coulomb (C)

Answer: c) Newton per coulomb (N/C)

Explanation:
Electric field $E = \frac{F}{q}$ , so its unit is force per unit charge, N/C.

Q12. A wire of length $L$ and cross-sectional area $A$ has resistance $R$ . If length is doubled and area is halved, the new resistance is:
a) $R/4$
b) $4R$
c) $2R$
d) $R/2$

Answer: b) $4R$

Explanation:
Resistance,

R = \rho \frac{L}{A}

New resistance,

R' = \rho \frac{2L}{A/2} = \rho \frac{2L \times 2}{A} = 4 \rho \frac{L}{A} = 4R

Optics (Continued)

Q13. The refractive index of a medium is defined as:
a) Ratio of speed of light in vacuum to speed in the medium
b) Ratio of speed of light in medium to speed in vacuum
c) Ratio of wavelength in vacuum to wavelength in medium
d) Both a and c

Answer: d) Both a and c

Explanation:
Refractive index $n = \frac{c}{v} = \frac{\lambda_0}{\lambda}$ , where $c$ is speed in vacuum, $v$ in medium, $\lambda_0$ wavelength in vacuum, and $\lambda$ wavelength in medium.

Q14. A concave mirror forms an image of magnification -1. The object distance is 20 cm. The focal length of the mirror is:
a) 10 cm
b) 20 cm
c) 40 cm
d) 5 cm

Answer: a) 10 cm

Explanation:
Magnification $m = \frac{v}{u} = -1 \Rightarrow v = -u$
Given, $u = -20 \, cm$ (object distance is negative in mirror formula conventions)
So, $v = 20 \, cm$
Using mirror formula,

\frac{1}{f} = \frac{1}{v} + \frac{1}{u} = \frac{1}{20} + \frac{1}{-20} = 0

This seems contradictory, so check signs carefully: For concave mirror, object is in front, $u = -20$ , $m = -1 \Rightarrow v = m \times u = (-1)(-20) = 20$ cm (real image, positive).

Then,

\frac{1}{f} = \frac{1}{v} + \frac{1}{u} = \frac{1}{20} - \frac{1}{20} = 0

No focal length? This means image formed at center of curvature (since $v = -u$ ).

Actually, magnification $m = -1$ means image size is same but inverted, image at center of curvature, so radius of curvature $R = 20 \, cm$ ,

f = \frac{R}{2} = 10 \, cm

Modern Physics (Continued)

Q15. The half-life of a radioactive substance is 10 hours. What fraction of the substance remains after 30 hours?
a) $\frac{1}{2}$
b) $\frac{1}{4}$
c) $\frac{1}{8}$
d) $\frac{1}{16}$

Answer: c) $\frac{1}{8}$

Explanation:
After each half-life, half of the substance remains.
Number of half-lives = $\frac{30}{10} = 3$
Fraction remaining = $\left(\frac{1}{2}\right)^3 = \frac{1}{8}$ .

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Mechanics (Continued)

Q16. Two forces of 3 N and 4 N act at a point at right angles. The magnitude of the resultant force is:
a) 1 N
b) 5 N
c) 7 N
d) 12 N

Answer: b) 5 N

Explanation:
Since the forces are perpendicular, use Pythagoras theorem:

R = \sqrt{3^2 + 4^2} = \sqrt{9 + 16} = \sqrt{25} = 5\, \text{N}

Q17. A body of mass 5 kg is moving with velocity 10 m/s. Its kinetic energy is:
a) 250 J
b) 125 J
c) 50 J
d) 500 J

Answer: b) 250 J

Explanation:
Kinetic energy,

KE = \frac{1}{2} m v^2 = \frac{1}{2} \times 5 \times 10^2 = \frac{1}{2} \times 5 \times 100 = 250 \, J

Q18. The velocity of a body moving in uniform circular motion is:
a) Constant in magnitude and direction
b) Constant in magnitude but changing in direction
c) Changing in magnitude but constant in direction
d) Changing both in magnitude and direction

Answer: b) Constant in magnitude but changing in direction

Explanation:
In uniform circular motion, speed (magnitude of velocity) is constant but velocity direction continuously changes.

Thermodynamics (Continued)

Q19. The first law of thermodynamics is based on the principle of:
a) Conservation of energy
b) Conservation of mass
c) Conservation of momentum
d) Conservation of charge

Answer: a) Conservation of energy

Explanation:
The first law states that the internal energy change of a system equals heat added minus work done by the system, expressing conservation of energy.

Q20. During an isothermal expansion of an ideal gas:
a) Temperature increases
b) Temperature decreases
c) Temperature remains constant
d) Pressure remains constant

Answer: c) Temperature remains constant

Explanation:
In isothermal processes, temperature $T$ remains constant throughout the expansion or compression.

Electrodynamics (Continued)

Q21. The capacitance of a capacitor depends on:
a) Area of plates
b) Distance between plates
c) Dielectric constant of material between plates
d) All of the above

Answer: d) All of the above

Explanation:
Capacitance $C = \epsilon_0 \epsilon_r \frac{A}{d}$ depends on plate area $A$ , plate separation $d$ , and dielectric constant $\epsilon_r$ .

Q22. Two resistors $R_1 = 4 \, \Omega$ and $R_2 = 6 \, \Omega$ are connected in series. The equivalent resistance is:
a) 2.4 Ω
b) 10 Ω
c) 1.5 Ω
d) 24 Ω

Answer: b) 10 Ω

Explanation:
For series resistors, equivalent resistance:

R = R_1 + R_2 = 4 + 6 = 10 \, \Omega

Optics (Continued)

Q23. Which phenomenon confirms the wave nature of light?
a) Photoelectric effect
b) Compton effect
c) Interference
d) Blackbody radiation

Answer: c) Interference

Explanation:
Interference, along with diffraction and polarization, is evidence for light’s wave nature.

Q24. The image formed by a plane mirror is:
a) Real and inverted
b) Virtual and erect
c) Real and erect
d) Virtual and inverted

Answer: b) Virtual and erect

Explanation:
Plane mirrors always produce virtual, erect, and laterally inverted images.

Modern Physics (Continued)

Q25. The energy of a photon is directly proportional to:
a) Frequency
b) Wavelength
c) Intensity
d) Speed

Answer: a) Frequency

Explanation:
Energy of photon $E = h \nu$ , where $\nu$ is frequency and $h$ is Planck’s constant.

Q26. The nucleus of an atom contains:
a) Only protons
b) Only neutrons
c) Protons and neutrons
d) Electrons and neutrons

Answer: c) Protons and neutrons

Explanation:
The nucleus contains positively charged protons and neutral neutrons.

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Mechanics (Continued)

Q27. The momentum of a body of mass 3 kg moving with velocity 4 m/s is:
a) 12 kg·m/s
b) 7 kg·m/s
c) 1.33 kg·m/s
d) 0.75 kg·m/s

Answer: a) 12 kg·m/s

Explanation:
Momentum $p = m \times v = 3 \times 4 = 12 \, \text{kg·m/s}$ .

Q28. A body is thrown horizontally from the top of a building 20 m high with speed 10 m/s. How long will it take to reach the ground? (Take $g = 9.8 \, m/s^2$ )
a) 2.02 s
b) 4.04 s
c) 1.43 s
d) 0.45 s

Answer: a) 2.02 s

Explanation:
Time to fall vertically:

h = \frac{1}{2} g t^2 \Rightarrow t = \sqrt{\frac{2h}{g}} = \sqrt{\frac{2 \times 20}{9.8}} = \sqrt{4.08} \approx 2.02 \, s

Thermodynamics (Continued)

Q29. The specific heat capacity at constant pressure $C_p$ of an ideal gas is related to $C_v$ by:
a) $C_p = C_v$
b) $C_p = C_v + R$
c) $C_p = C_v - R$
d) $C_p = 2C_v$

Answer: b) $C_p = C_v + R$

Explanation:
This relation comes from Mayer’s relation, where $R$ is the gas constant.

Q30. In an isobaric process, the pressure remains:
a) Constant
b) Increasing
c) Decreasing
d) Variable

Answer: a) Constant

Explanation:
Isobaric process means constant pressure.

Electrodynamics (Continued)

Q31. The unit of magnetic field is:
a) Tesla
b) Newton
c) Weber
d) Coulomb

Answer: a) Tesla

Explanation:
Magnetic field strength or magnetic flux density is measured in Tesla (T).

Q32. The current flowing through a conductor is 3 A. The charge flowing through it in 2 seconds is:
a) 1.5 C
b) 6 C
c) 3 C
d) 0.66 C

Answer: b) 6 C

Explanation:
Charge $Q = I \times t = 3 \times 2 = 6 \, \text{C}$ .

Optics (Continued)

Q33. The power of a lens is +2 diopters. Its focal length is:
a) 0.5 m
b) 2 m
c) 50 cm
d) 25 cm

Answer: a) 0.5 m

Explanation:
Power $P = \frac{100}{f(\text{cm})} \Rightarrow f = \frac{100}{P} = \frac{100}{2} = 50 \, \text{cm} = 0.5 \, m$ .

Q34. The phenomenon of bending of light when it passes from one medium to another is called:
a) Reflection
b) Refraction
c) Diffraction
d) Dispersion

Answer: b) Refraction

Explanation:
Refraction occurs due to change in speed of light in different media causing bending.

Modern Physics (Continued)

Q35. The De Broglie wavelength $\lambda$ of a particle is inversely proportional to:
a) Its energy
b) Its momentum
c) Its velocity squared
d) Its mass

Answer: b) Its momentum

Explanation:
De Broglie relation:

\lambda = \frac{h}{p}

where $p$ is momentum.

Q36. In the nuclear reaction $_6^{14}C \rightarrow _7^{14}N + \beta^-$ , what happens?
a) Proton number increases by 1
b) Neutron number increases by 1
c) Mass number increases by 1
d) Both proton and neutron numbers decrease

Answer: a) Proton number increases by 1

Explanation:
Beta decay converts a neutron to a proton, increasing atomic number by 1 but mass number remains the same.

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Mechanics (Continued)

Q37. A 5 kg object is moving with velocity 3 m/s. What is its kinetic energy?
a) 7.5 J
b) 15 J
c) 22.5 J
d) 30 J

Answer: c) 22.5 J

Explanation:

KE = \frac{1}{2} m v^2 = \frac{1}{2} \times 5 \times 3^2 = \frac{1}{2} \times 5 \times 9 = 22.5 \, J

Q38. The acceleration due to gravity on the surface of the Moon is about 1/6th that of Earth. If an object weighs 60 N on Earth, what is its weight on the Moon?
a) 10 N
b) 60 N
c) 360 N
d) 6 N

Answer: a) 10 N

Explanation:
Weight on Moon = $\frac{1}{6} \times$ Weight on Earth = $\frac{1}{6} \times 60 = 10\, N$ .

Thermodynamics (Continued)

Q39. The process in which volume remains constant but pressure and temperature change is called:
a) Isothermal
b) Isobaric
c) Isochoric
d) Adiabatic

Answer: c) Isochoric

Explanation:
In isochoric process, volume is constant.

Q40. Which law states that pressure and volume of a gas are inversely proportional at constant temperature?
a) Boyle’s Law
b) Charles’s Law
c) Gay-Lussac’s Law
d) Avogadro’s Law

Answer: a) Boyle’s Law

Explanation:
Boyle’s law: $P \propto \frac{1}{V}$ at constant $T$ .

Electrodynamics (Continued)

Q41. What is the direction of current in a wire?
a) Direction of electron flow
b) Direction opposite to electron flow
c) Direction of magnetic field
d) None of the above

Answer: b) Direction opposite to electron flow

Explanation:
Conventional current flows from positive to negative, opposite to electron flow.

Q42. The resistance of a wire depends on:
a) Length only
b) Area only
c) Both length and area
d) Neither length nor area

Answer: c) Both length and area

Explanation:
Resistance $R = \rho \frac{L}{A}$ , depends on length $L$ and cross-sectional area $A$ .

Optics (Continued)

Q43. When white light passes through a prism, it splits into various colors. This phenomenon is called:
a) Reflection
b) Refraction
c) Dispersion
d) Diffraction

Answer: c) Dispersion

Explanation:
Dispersion is the separation of white light into colors due to different refractive indices.

Q44. The image formed by a convex lens when the object is at the focal point is:
a) Real and inverted at infinity
b) Virtual and erect
c) Real and inverted between focus and lens
d) Virtual and inverted

Answer: a) Real and inverted at infinity

Explanation:
Object at focal point of convex lens produces rays parallel after refraction, image formed at infinity.

Modern Physics (Continued)

Q45. Which of the following particles has the least mass?
a) Proton
b) Neutron
c) Electron
d) Alpha particle

Answer: c) Electron

Explanation:
Electron has the least mass compared to proton, neutron, and alpha particle.

Q46. The unit of Planck’s constant is:
a) Joule-second
b) Joule
c) Watt
d) Volt

Answer: a) Joule-second

Explanation:
Planck’s constant has units of energy × time = Joule-second (J·s).

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Mechanics (Continued)

Q47. The acceleration of a body moving in a circle of radius $r$ with uniform speed $v$ is:
a) $\frac{v^2}{r}$ directed towards center
b) $\frac{v^2}{r}$ directed away from center
c) $\frac{v}{r}$ directed towards center
d) $\frac{v}{r}$ directed away from center

Answer: a) $\frac{v^2}{r}$ directed towards center

Explanation:
Centripetal acceleration in uniform circular motion is $a_c = \frac{v^2}{r}$ , always directed towards the center.

Q48. The SI unit of work is:
a) Joule
b) Newton
c) Watt
d) Pascal

Answer: a) Joule

Explanation:
Work = force × displacement, unit = Newton × meter = Joule (J).

Thermodynamics (Continued)

Q49. The entropy of a system:
a) Always decreases
b) Always increases
c) Remains constant for irreversible processes
d) Increases for irreversible processes

Answer: d) Increases for irreversible processes

Explanation:
Entropy increases for irreversible processes, remains constant for reversible ones.

Q50. In an adiabatic process, the work done by the gas comes from:
a) Heat supplied to the system
b) Internal energy of the system
c) External force
d) Temperature increase

Answer: b) Internal energy of the system

Explanation:
In adiabatic process, no heat exchange ( $Q=0$ ), so work done reduces internal energy.

Electrodynamics (Continued)

Q51. Ohm’s law states:
a) Current is proportional to voltage for a conductor at constant temperature
b) Voltage is inversely proportional to current
c) Resistance is independent of temperature
d) Power is proportional to current

Answer: a) Current is proportional to voltage for a conductor at constant temperature

Explanation:
Ohm’s law: $V = IR$ , current proportional to voltage if resistance is constant.

Q52. The energy stored in a capacitor of capacitance $C$ charged to voltage $V$ is:
a) $\frac{1}{2} C V^2$
b) $C V^2$
c) $\frac{1}{2} C V$
d) $CV$

Answer: a) $\frac{1}{2} C V^2$

Explanation:
Energy stored $U = \frac{1}{2} C V^2$ .

Optics (Continued)

Q53. The focal length of a lens depends on:
a) Radius of curvature of the lens surfaces
b) Refractive index of lens material
c) Both (a) and (b)
d) Neither (a) nor (b)

Answer: c) Both (a) and (b)

Explanation:
Lens maker’s formula:

\frac{1}{f} = (n - 1) \left( \frac{1}{R_1} - \frac{1}{R_2} \right)

Q54. The phenomenon where light bends around corners and spreads after passing through narrow openings is called:
a) Reflection
b) Refraction
c) Diffraction
d) Dispersion

Answer: c) Diffraction

Explanation:
Diffraction is the bending and spreading of waves around obstacles.

Modern Physics (Continued)

Q55. Which radiation has the shortest wavelength?
a) Gamma rays
b) X-rays
c) Ultraviolet rays
d) Infrared rays

Answer: a) Gamma rays

Explanation:
Gamma rays have shortest wavelength and highest energy in electromagnetic spectrum.

Q56. The photoelectric effect proves the particle nature of light because:
a) Light behaves as wave
b) Energy is absorbed in discrete packets called photons
c) Energy depends on amplitude of light wave
d) Electrons move in circular orbits

Answer: b) Energy is absorbed in discrete packets called photons

Explanation:
Photoelectric effect shows electrons emitted only when light frequency is above threshold, supporting photon concept.

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Mechanics (Continued)

Q57. A block of mass 2 kg is pulled with a force of 10 N on a frictionless surface. What is its acceleration?
a) 2 m/s²
b) 5 m/s²
c) 10 m/s²
d) 20 m/s²

Answer: a) 5 m/s²

Explanation:
Using Newton’s second law,

a = \frac{F}{m} = \frac{10}{2} = 5 \, m/s^2

Q58. The work done in moving a charge $q$ through a potential difference $V$ is:
a) $q/V$
b) $q \times V$
c) $V/q$
d) $q^2 V$

Answer: b) $q \times V$

Explanation:
Work done $W = qV$ .

Thermodynamics (Continued)

Q59. For an ideal gas, the internal energy depends on:
a) Volume only
b) Temperature only
c) Pressure only
d) Both pressure and volume

Answer: b) Temperature only

Explanation:
Internal energy of an ideal gas depends only on temperature.

Q60. Which process does no work on or by the gas?
a) Isothermal
b) Isobaric
c) Isochoric
d) Adiabatic

Answer: c) Isochoric

Explanation:
Volume remains constant in isochoric process, so no work is done.

Electrodynamics (Continued)

Q61. The resistance of a wire of length $L$ and area $A$ is $R$ . If the length is doubled and area halved, the new resistance is:
a) $R/2$
b) $2R$
c) $4R$
d) $8R$

Answer: d) $8R$

Explanation:
Resistance $R = \rho \frac{L}{A}$ .
New resistance:

R' = \rho \frac{2L}{A/2} = \rho \frac{2L \times 2}{A} = 4 \times \frac{L}{A} = 4R

Actually, re-check: doubling length doubles resistance, halving area doubles resistance → total resistance is $2 \times 2 = 4R$ . So answer is 4R.

Correction: Answer is c) 4R

Q62. The magnetic force on a moving charge is maximum when the velocity vector is:
a) Parallel to magnetic field
b) Perpendicular to magnetic field
c) At 45° to magnetic field
d) Zero

Answer: b) Perpendicular to magnetic field

Explanation:
Magnetic force $F = qvB \sin \theta$ , max at $\theta = 90^\circ$ .

Optics (Continued)

Q63. A ray of light passes from air into glass. The speed of light in glass is:
a) Greater than in air
b) Less than in air
c) Equal to speed in air
d) Infinite

Answer: b) Less than in air

Explanation:
Light slows down when entering denser medium.

Q64. The image formed by a concave mirror when object is between focal point and mirror is:
a) Real and inverted
b) Virtual and erect
c) Real and erect
d) Virtual and inverted

Answer: b) Virtual and erect

Explanation:
Object between mirror and focus produces virtual, erect, enlarged image.

Modern Physics (Continued)

Q65. The half-life of a radioactive substance is:
a) Time taken for complete decay
b) Time taken for half the nuclei to decay
c) Time taken for twice the nuclei to decay
d) None of these

Answer: b) Time taken for half the nuclei to decay

Explanation:
Half-life is the time in which half the radioactive nuclei decay.

Q66. Which particle is emitted during alpha decay?
a) Electron
b) Proton
c) Helium nucleus
d) Neutron

Answer: c) Helium nucleus

Explanation:
Alpha particle is a helium nucleus consisting of 2 protons and 2 neutrons.

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Mechanics (Continued)

Q67. A stone is thrown vertically upward with a speed of 20 m/s. The maximum height reached is:
a) 20 m
b) 10 m
c) 40 m
d) 30 m

Answer: a) 20 m

Explanation:
Using formula $h = \frac{v^2}{2g} = \frac{20^2}{2 \times 9.8} = \frac{400}{19.6} \approx 20.4\, m$ .

Q68. The velocity of an object is doubled. Its kinetic energy:
a) Doubles
b) Halves
c) Quadruples
d) Remains the same

Answer: c) Quadruples

Explanation:
$KE \propto v^2$ , so if velocity doubles, KE increases by $2^2 = 4$ .

Thermodynamics (Continued)

Q69. Which gas has the highest root mean square speed at room temperature?
a) Oxygen
b) Nitrogen
c) Hydrogen
d) Carbon dioxide

Answer: c) Hydrogen

Explanation:
$v_{rms} = \sqrt{\frac{3kT}{m}}$ , so lighter gas (hydrogen) has higher rms speed.

Q70. The efficiency of a Carnot engine depends on:
a) Heat supplied only
b) Heat rejected only
c) Temperature of source and sink
d) Pressure and volume

Answer: c) Temperature of source and sink

Explanation:
Efficiency $\eta = 1 - \frac{T_C}{T_H}$ , depends only on temperatures of hot and cold reservoirs.

Electrodynamics (Continued)

Q71. The potential difference across a 10 Ω resistor carrying 2 A current is:
a) 5 V
b) 10 V
c) 20 V
d) 40 V

Answer: c) 20 V

Explanation:
$V = IR = 2 \times 10 = 20\, V$ .

Q72. The unit of electric charge is:
a) Coulomb
b) Ampere
c) Volt
d) Ohm

Answer: a) Coulomb

Explanation:
Charge is measured in Coulombs.

Optics (Continued)

Q73. Which color of light has the highest refractive index in glass?
a) Red
b) Blue
c) Green
d) Yellow

Answer: b) Blue

Explanation:
Blue light has shorter wavelength and higher refractive index causing more bending.

Q74. The critical angle of water-air interface is approximately:
a) 42°
b) 48°
c) 60°
d) 90°

Answer: a) 42°

Explanation:
Critical angle $\theta_c = \sin^{-1} \left(\frac{n_2}{n_1}\right) = \sin^{-1} \left(\frac{1}{1.33}\right) \approx 48.7^\circ$ . Common approximation is 42°.

Note: Actually, critical angle for water to air is about 48.7°, so the closest correct is b) 48°. Please consider this corrected answer.

Modern Physics (Continued)

Q75. The rest mass energy of an electron is approximately:
a) 0.511 MeV
b) 1 MeV
c) 938 MeV
d) 511 keV

Answer: a) 0.511 MeV

Explanation:
Electron rest mass energy $E = m c^2 \approx 0.511 \, \text{MeV}$ .

Q76. The frequency of a photon is $6 \times 10^{14}$ Hz. Its energy is (take $h = 6.63 \times 10^{-34}$ J·s):
a) $3.98 \times 10^{-19}$ J
b) $1.10 \times 10^{-19}$ J
c) $6.63 \times 10^{-34}$ J
d) $3.98 \times 10^{-15}$ J

Answer: a) $3.98 \times 10^{-19}$ J

Explanation:
Energy $E = h \nu = 6.63 \times 10^{-34} \times 6 \times 10^{14} = 3.978 \times 10^{-19} \, \text{J}$ .

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Mechanics (Continued)

Q77. A block slides down a frictionless incline of height 5 m. The speed at the bottom is:
a) 10 m/s
b) 9.9 m/s
c) 5 m/s
d) 7 m/s

Answer: b) 9.9 m/s

Explanation:
Using energy conservation:

mgh = \frac{1}{2} m v^2 \Rightarrow v = \sqrt{2gh} = \sqrt{2 \times 9.8 \times 5} \approx 9.9 \, m/s

Q78. The time period of a simple pendulum depends on:
a) Mass of the bob
b) Length of the string
c) Amplitude of oscillation
d) Both mass and length

Answer: b) Length of the string

Explanation:
Time period $T = 2\pi \sqrt{\frac{l}{g}}$ , independent of mass and amplitude (for small angles).

Thermodynamics (Continued)

Q79. For a perfect gas undergoing an isothermal process, the change in internal energy is:
a) Positive
b) Negative
c) Zero
d) Variable

Answer: c) Zero

Explanation:
Internal energy of ideal gas depends only on temperature; in isothermal process, temperature is constant.

Q80. The work done by gas during isothermal expansion from volume $V_1$ to $V_2$ is:
a) $nRT \ln \frac{V_2}{V_1}$
b) $nRT \frac{V_2 - V_1}{V_1}$
c) $\frac{1}{2} nRT (V_2 - V_1)$
d) $nR (V_2 - V_1)$

Answer: a) $nRT \ln \frac{V_2}{V_1}$

Explanation:
Work done in isothermal expansion:

W = nRT \ln \frac{V_2}{V_1}

Electrodynamics (Continued)

Q81. The SI unit of capacitance is:
a) Farad
b) Henry
c) Weber
d) Tesla

Answer: a) Farad

Explanation:
Capacitance is measured in Farads (F).

Q82. The total resistance in series circuit of resistors $R_1$ , $R_2$ , and $R_3$ is:
a) $\frac{1}{R_1} + \frac{1}{R_2} + \frac{1}{R_3}$
b) $R_1 + R_2 + R_3$
c) $R_1 R_2 R_3$
d) $R_1 R_2 + R_2 R_3 + R_3 R_1$

Answer: b) $R_1 + R_2 + R_3$

Explanation:
Resistances add directly in series.

Optics (Continued)

Q83. The refractive index of a medium is defined as:
a) Speed of light in vacuum / speed of light in medium
b) Speed of light in medium / speed of light in vacuum
c) Wavelength in vacuum / wavelength in medium
d) Both a) and c)

Answer: d) Both a) and c)

Explanation:
Refractive index $n = \frac{c}{v} = \frac{\lambda_0}{\lambda}$ .

Q84. Which type of lens is used to correct myopia?
a) Convex lens
b) Concave lens
c) Cylindrical lens
d) Plane glass

Answer: b) Concave lens

Explanation:
Myopia (nearsightedness) corrected by diverging (concave) lens.

Modern Physics (Continued)

Q85. The photoelectric current is proportional to:
a) Frequency of incident light
b) Intensity of incident light
c) Work function of metal
d) Velocity of emitted electrons

Answer: b) Intensity of incident light

Explanation:
Photoelectric current depends on number of photons (intensity), not frequency.

Q86. The electron has:
a) Positive charge
b) Negative charge
c) No charge
d) Variable charge

Answer: b) Negative charge

Explanation:
Electron carries negative electric charge.

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Mechanics (Continued)

Q87. Two bodies of masses $m$ and $2m$ are moving with velocities $v$ and $2v$ respectively. Their total momentum is:
a) $3mv$
b) $5mv$
c) $6mv$
d) $4mv$

Answer: b) $5mv$

Explanation:
Total momentum $p = m \times v + 2m \times 2v = mv + 4mv = 5mv$ .

Q88. The angular displacement of a particle rotating with angular velocity $\omega$ after time $t$ is:
a) $\omega t$
b) $\frac{\omega}{t}$
c) $\omega + t$
d) $\omega t^2$

Answer: a) $\omega t$

Explanation:
Angular displacement $\theta = \omega t$ when angular velocity is constant.

Thermodynamics (Continued)

Q89. The specific heat capacity at constant volume for an ideal monoatomic gas is:
a) $\frac{3}{2} R$
b) $\frac{5}{2} R$
c) $3R$
d) $\frac{7}{2} R$

Answer: a) $\frac{3}{2} R$

Explanation:
For monoatomic ideal gas, $C_V = \frac{3}{2} R$ .

Q90. The first law of thermodynamics is a statement of:
a) Conservation of mass
b) Conservation of momentum
c) Conservation of energy
d) Increase in entropy

Answer: c) Conservation of energy

Explanation:
First law states $\Delta U = Q - W$ , energy conservation principle.

Electrodynamics (Continued)

Q91. The magnetic field due to a long straight current-carrying wire at distance $r$ is:
a) $\frac{\mu_0 I}{2\pi r}$
b) $\frac{\mu_0 I r}{2\pi}$
c) $\frac{\mu_0 I}{4\pi r^2}$
d) $\frac{2\pi r}{\mu_0 I}$

Answer: a) $\frac{\mu_0 I}{2\pi r}$

Explanation:
From Biot-Savart law, magnetic field around wire:

B = \frac{\mu_0 I}{2 \pi r}

Q92. The unit of magnetic flux is:
a) Tesla
b) Weber
c) Ampere
d) Henry

Answer: b) Weber

Explanation:
Magnetic flux unit is Weber (Wb).

Optics (Continued)

Q93. The power of a lens is +2 diopters. Its focal length is:
a) 0.5 m
b) 2 m
c) -0.5 m
d) -2 m

Answer: a) 0.5 m

Explanation:
Power $P = \frac{100}{f (\text{cm})}$ , so $f = \frac{100}{P} = \frac{100}{2} = 50 \text{cm} = 0.5\, m$ .

Q94. The image formed by a plane mirror is:
a) Real and inverted
b) Virtual and erect
c) Real and erect
d) Virtual and inverted

Answer: b) Virtual and erect

Explanation:
Plane mirrors produce virtual, erect images same size as object.

Modern Physics (Continued)

Q95. The wavelength associated with a particle of mass $m$ moving with velocity $v$ is given by:
a) $\frac{h}{mv}$
b) $\frac{mv}{h}$
c) $\frac{h}{m}$
d) $\frac{v}{h}$

Answer: a) $\frac{h}{mv}$

Explanation:
De Broglie wavelength: $\lambda = \frac{h}{p} = \frac{h}{mv}$ .

Q96. The work function of a metal is 2 eV. What is the threshold frequency? (Take $h = 6.63 \times 10^{-34}$ J·s, $1 \text{ eV} = 1.6 \times 10^{-19}$ J)
a) $4.8 \times 10^{14}$ Hz
b) $3.2 \times 10^{14}$ Hz
c) $1.2 \times 10^{15}$ Hz
d) $2.4 \times 10^{15}$ Hz

Answer: a) $4.8 \times 10^{14}$ Hz

Explanation:

\phi = h \nu_0 \Rightarrow \nu_0 = \frac{\phi}{h} = \frac{2 \times 1.6 \times 10^{-19}}{6.63 \times 10^{-34}} = 4.8 \times 10^{14} \, Hz

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Mechanics (Continued)

Q97. The momentum of a particle is doubled. The kinetic energy is:
a) Doubled
b) Quadrupled
c) Halved
d) Unchanged

Answer: b) Quadrupled

Explanation:
Kinetic energy $K = \frac{p^2}{2m}$ . If momentum $p \to 2p$ , then

K' = \frac{(2p)^2}{2m} = 4 \times \frac{p^2}{2m} = 4K

Q98. The force acting on a body moving in a circle at constant speed is:
a) Centrifugal force
b) Centripetal force
c) Gravitational force
d) Frictional force

Answer: b) Centripetal force

Explanation:
Centripetal force acts toward the center to keep the body in circular motion.

Thermodynamics (Continued)

Q99. The heat absorbed during a phase change from liquid to vapor at constant temperature is called:
a) Specific heat
b) Latent heat of vaporization
c) Latent heat of fusion
d) Heat capacity

Answer: b) Latent heat of vaporization

Explanation:
Energy required to convert liquid to vapor without temperature change is latent heat of vaporization.

Q100. In an adiabatic process, the work done by the gas comes from:
a) Heat absorbed
b) Internal energy
c) Work done on surroundings
d) None of the above

Answer: b) Internal energy

Explanation:
No heat exchange in adiabatic process; work comes from internal energy change.

Electrodynamics (Continued)

Q101. The emf induced in a coil is maximum when the coil is rotated:
a) Parallel to magnetic field
b) Perpendicular to magnetic field
c) At 45° to magnetic field
d) At rest

Answer: b) Perpendicular to magnetic field

Explanation:
Maximum change in flux, hence emf, occurs when coil’s plane is perpendicular to magnetic field.

Q102. The direction of induced current is given by:
a) Faraday’s law
b) Lenz’s law
c) Newton’s law
d) Coulomb’s law

Answer: b) Lenz’s law

Explanation:
Lenz’s law states induced current opposes the change producing it.

Optics (Continued)

Q103. A concave lens always forms an image that is:
a) Real and inverted
b) Virtual and erect
c) Real and erect
d) Virtual and inverted

Answer: b) Virtual and erect

Explanation:
Concave lens forms virtual, erect, and diminished images.

Q104. When light passes from air into a denser medium, its:
a) Speed increases
b) Wavelength decreases
c) Frequency changes
d) Frequency decreases

Answer: b) Wavelength decreases

Explanation:
Speed and wavelength decrease, frequency remains constant.

Modern Physics (Continued)

Q105. The unit of Planck’s constant is:
a) Joule-second
b) Joule
c) Second
d) Meter

Answer: a) Joule-second

Explanation:
Planck’s constant $h$ has units of energy × time = Joule-second.

Q106. The phenomenon of emission of electrons from a metal surface when light falls on it is called:
a) Compton effect
b) Photoelectric effect
c) Electron diffraction
d) Pair production

Answer: b) Photoelectric effect

Explanation:
Photoelectric effect describes emission of electrons due to incident light.

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Mechanics (Continued)

Q107. The acceleration due to gravity on the surface of the Earth is approximately:
a) 9.8 m/s²
b) 10 m/s²
c) 9.8 cm/s²
d) 9.8 km/s²

Answer: a) 9.8 m/s²

Explanation:
Standard acceleration due to gravity on Earth is approximately 9.8 m/s².

Q108. The work done by a force is zero when:
a) Force is parallel to displacement
b) Force is perpendicular to displacement
c) Force is opposite to displacement
d) Displacement is zero

Answer: b) Force is perpendicular to displacement

Explanation:
Work done $W = F d \cos \theta$ , if $\theta = 90^\circ$ , then $W = 0$ .

Thermodynamics (Continued)

Q109. The gas which does not obey the ideal gas equation under normal conditions is:
a) Hydrogen
b) Helium
c) Carbon dioxide
d) Oxygen

Answer: c) Carbon dioxide

Explanation:
CO₂ shows significant deviations from ideal behavior due to molecular interactions.

Q110. The efficiency of a Carnot engine operating between 500 K and 300 K is:
a) 0.4
b) 0.6
c) 0.3
d) 0.5

Answer: a) 0.4

Explanation:

\eta = 1 - \frac{T_C}{T_H} = 1 - \frac{300}{500} = 1 - 0.6 = 0.4

Electrodynamics (Continued)

Q111. Ohm’s law states that:
a) Voltage is proportional to current at constant temperature
b) Current is inversely proportional to voltage
c) Resistance varies with current
d) None of the above

Answer: a) Voltage is proportional to current at constant temperature

Explanation:
Ohm’s law: $V = IR$ .

Q112. The unit of electric current is:
a) Volt
b) Coulomb
c) Ampere
d) Ohm

Answer: c) Ampere

Explanation:
Electric current is measured in Amperes (A).

Optics (Continued)

Q113. The phenomenon of splitting of white light into its constituent colors is called:
a) Reflection
b) Refraction
c) Dispersion
d) Diffraction

Answer: c) Dispersion

Explanation:
Dispersion causes white light to separate into colors due to different refractive indices.

Q114. The magnification produced by a plane mirror is:
a) Greater than 1
b) Less than 1
c) Equal to 1
d) Zero

Answer: c) Equal to 1

Explanation:
Plane mirror produces image same size as the object.

Modern Physics (Continued)

Q115. The velocity of light in vacuum is approximately:
a) $3 \times 10^6$ m/s
b) $3 \times 10^8$ m/s
c) $3 \times 10^{10}$ m/s
d) $3 \times 10^5$ m/s

Answer: b) $3 \times 10^8$ m/s

Explanation:
Speed of light in vacuum $c = 3 \times 10^8$ m/s.

Q116. In the photoelectric effect, increasing the intensity of incident light will:
a) Increase kinetic energy of emitted electrons
b) Increase number of emitted electrons
c) Increase threshold frequency
d) Decrease stopping potential

Answer: b) Increase number of emitted electrons

Explanation:
Intensity is proportional to number of photons, so more electrons emitted.

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Mechanics (Continued)

Q117. A projectile is fired with velocity $u$ at an angle $\theta$ with the horizontal. The time of flight is:
a) $\frac{2u \cos \theta}{g}$
b) $\frac{u \sin \theta}{g}$
c) $\frac{2u \sin \theta}{g}$
d) $\frac{u \cos \theta}{g}$

Answer: c) $\frac{2u \sin \theta}{g}$

Explanation:
Time of flight $T = \frac{2u \sin \theta}{g}$ .

Q118. The SI unit of moment of inertia is:
a) kg·m²
b) kg·m
c) N·m
d) J·s

Answer: a) kg·m²

Explanation:
Moment of inertia units come from mass × (distance)².

Thermodynamics (Continued)

Q119. For an ideal gas, the molar specific heat at constant pressure is:
a) $\frac{3}{2} R$
b) $\frac{5}{2} R$
c) $3R$
d) $2R$

Answer: b) $\frac{5}{2} R$

Explanation:
For monoatomic gas, $C_p = C_v + R = \frac{3}{2} R + R = \frac{5}{2} R$ .

Q120. The entropy of a perfect crystal at absolute zero is:
a) Zero
b) Maximum
c) Infinity
d) Undefined

Answer: a) Zero

Explanation:
Third law of thermodynamics states entropy of a perfect crystal at 0 K is zero.

Electrodynamics (Continued)

Q121. In an LC circuit, the energy oscillates between:
a) Electric field and magnetic field
b) Electric field and kinetic energy
c) Magnetic field and kinetic energy
d) Thermal energy and kinetic energy

Answer: a) Electric field and magnetic field

Explanation:
Energy oscillates between capacitor’s electric field and inductor’s magnetic field.

Q122. The capacitance of a parallel plate capacitor depends on:
a) Area of plates and distance between them
b) Only area of plates
c) Only distance between plates
d) Neither area nor distance

Answer: a) Area of plates and distance between them

Explanation:
$C = \frac{\epsilon_0 A}{d}$ , depends on area $A$ and distance $d$ .

Optics (Continued)

Q123. The focal length of a convex lens is 20 cm. Its power is:
a) +5 D
b) -5 D
c) +20 D
d) -20 D

Answer: a) +5 D

Explanation:
Power $P = \frac{100}{f(\text{cm})} = \frac{100}{20} = 5 \, \text{D}$ and convex lens has positive power.

Q124. Total internal reflection occurs when light passes from:
a) Denser to rarer medium with angle of incidence less than critical angle
b) Rarer to denser medium
c) Denser to rarer medium with angle of incidence greater than critical angle
d) Rarer to denser medium with angle of incidence greater than critical angle

Answer: c) Denser to rarer medium with angle of incidence greater than critical angle

Explanation:
Total internal reflection occurs only if light goes from denser to rarer medium and incidence angle exceeds critical angle.

Modern Physics (Continued)

Q125. The energy of a photon is given by:
a) $E = h \nu$
b) $E = m c^2$
c) $E = \frac{1}{2} m v^2$
d) $E = qV$

Answer: a) $E = h \nu$

Explanation:
Photon energy depends on frequency $\nu$ and Planck’s constant $h$ .

Q126. The nucleus of an atom contains:
a) Protons only
b) Neutrons only
c) Protons and neutrons
d) Electrons only

Answer: c) Protons and neutrons

Explanation:
Atomic nucleus is made of protons and neutrons.

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Mechanics (Continued)

Q127. The velocity of a body moving in uniform circular motion is:
a) Tangential to the circle
b) Radial towards the center
c) Radial away from the center
d) Zero

Answer: a) Tangential to the circle

Explanation:
In uniform circular motion, velocity vector is always tangent to the path.

Q128. The work done by gravitational force when a body moves from height $h_1$ to $h_2$ is:
a) $mg(h_2 - h_1)$
b) $mg(h_1 - h_2)$
c) Zero
d) $mg(h_1 + h_2)$

Answer: b) $mg(h_1 - h_2)$

Explanation:
Work done = Force × displacement in force direction; gravity acts downward.

Thermodynamics (Continued)

Q129. Which of the following is an extensive property?
a) Temperature
b) Pressure
c) Volume
d) Density

Answer: c) Volume

Explanation:
Volume depends on the size of the system (extensive).

Q130. The efficiency of a heat engine is zero when:
a) Heat absorbed equals heat rejected
b) Work done equals heat absorbed
c) Heat absorbed is zero
d) Heat rejected is zero

Answer: a) Heat absorbed equals heat rejected

Explanation:
No net energy conversion into work when heat input = heat output.

Electrodynamics (Continued)

Q131. The resistance of a wire is directly proportional to:
a) Length and cross-sectional area
b) Length and inversely proportional to cross-sectional area
c) Cross-sectional area only
d) Length only

Answer: b) Length and inversely proportional to cross-sectional area

Explanation:
Resistance $R = \rho \frac{L}{A}$ .

Q132. The magnetic field inside a long solenoid carrying current $I$ is:
a) $\mu_0 n I$
b) $\frac{\mu_0 I}{2 \pi r}$
c) Zero
d) $\mu_0 I$

Answer: a) $\mu_0 n I$

Explanation:
$n$ is the number of turns per unit length.

Optics (Continued)

Q133. The critical angle for total internal reflection depends on:
a) Wavelength of light
b) Refractive indices of the two media
c) Intensity of light
d) Polarization of light

Answer: b) Refractive indices of the two media

Explanation:
Critical angle $\theta_c = \sin^{-1} \left(\frac{n_2}{n_1}\right)$ where $n_1 > n_2$ .

Q134. The image formed by a concave mirror of a distant object is:
a) Virtual and magnified
b) Real and diminished
c) Real and inverted
d) Virtual and erect

Answer: c) Real and inverted

Explanation:
Distant objects form real, inverted images at the focus of a concave mirror.

Modern Physics (Continued)

Q135. The atomic number of an element represents the number of:
a) Protons
b) Neutrons
c) Electrons
d) Protons and neutrons

Answer: a) Protons

Explanation:
Atomic number is number of protons in the nucleus.

Q136. The half-life of a radioactive substance is:
a) The time taken for half the nuclei to decay
b) The time taken for all nuclei to decay
c) Twice the time taken for full decay
d) None of the above

Answer: a) The time taken for half the nuclei to decay

Explanation:
Half-life is time for half the radioactive atoms to disintegrate.

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Mechanics (Continued)

Q137. The displacement-time graph of a simple harmonic oscillator is:
a) A straight line
b) A sine or cosine wave
c) A parabola
d) A hyperbola

Answer: b) A sine or cosine wave

Explanation:
SHM displacement varies sinusoidally with time: $x = A \sin(\omega t + \phi)$ .

Q138. The velocity of an object in SHM is zero when:
a) Displacement is zero
b) Displacement is maximum
c) Acceleration is zero
d) None of the above

Answer: b) Displacement is maximum

Explanation:
At maximum displacement (amplitude), velocity is zero (turning points).

Thermodynamics (Continued)

Q139. Which gas law states that volume is inversely proportional to pressure at constant temperature?
a) Boyle’s law
b) Charles’s law
c) Gay-Lussac’s law
d) Avogadro’s law

Answer: a) Boyle’s law

Explanation:
Boyle’s law: $PV = \text{constant}$ at constant $T$ .

Q140. An isochoric process is a process at:
a) Constant pressure
b) Constant volume
c) Constant temperature
d) None of the above

Answer: b) Constant volume

Explanation:
Volume remains constant, so no work done during an isochoric process.

Electrodynamics (Continued)

Q141. In a conductor, free electrons move due to:
a) Electric field
b) Magnetic field
c) Gravitational field
d) Nuclear forces

Answer: a) Electric field

Explanation:
Electric field exerts force causing drift velocity of free electrons.

Q142. The unit of electric potential difference is:
a) Volt
b) Ampere
c) Ohm
d) Watt

Answer: a) Volt

Explanation:
Volt is unit of potential difference (1 V = 1 J/C).

Optics (Continued)

Q143. When light passes from one medium to another, which of the following remains constant?
a) Speed
b) Frequency
c) Wavelength
d) Intensity

Answer: b) Frequency

Explanation:
Frequency remains constant; speed and wavelength change.

Q144. The image formed by a concave mirror of an object placed between the pole and focus is:
a) Real and inverted
b) Virtual and erect
c) Real and erect
d) Virtual and inverted

Answer: b) Virtual and erect

Explanation:
Object between pole and focus forms virtual, erect, magnified image.

Modern Physics (Continued)

Q145. The energy levels of an atom are:
a) Continuous
b) Discrete
c) Random
d) Infinite

Answer: b) Discrete

Explanation:
Electrons can only occupy specific allowed energy levels.

Q146. The radiation emitted by a black body depends on:
a) Temperature only
b) Pressure only
c) Volume only
d) Both temperature and volume

Answer: a) Temperature only

Explanation:
Blackbody radiation intensity depends on temperature alone.

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Mechanics (Continued)

Q147. The linear momentum of a system of particles is:
a) Sum of the momentum of each particle
b) Product of momentum of all particles
c) Average of the momenta
d) None of the above

Answer: a) Sum of the momentum of each particle

Explanation:
Total linear momentum is vector sum of individual momenta.

Q148. If a body moves with uniform velocity, its acceleration is:
a) Zero
b) Constant
c) Increasing
d) Variable

Answer: a) Zero

Explanation:
Uniform velocity means no change in speed or direction, so acceleration is zero.

Thermodynamics (Continued)

Q149. The first law of thermodynamics is a statement of:
a) Conservation of mass
b) Conservation of energy
c) Entropy increase
d) Energy dissipation

Answer: b) Conservation of energy

Explanation:
First law relates internal energy change to heat added and work done.

Q150. A gas expands isothermally, then:
a) Its internal energy increases
b) Its internal energy decreases
c) Its internal energy remains constant
d) Its temperature increases

Answer: c) Its internal energy remains constant

Explanation:
Internal energy depends on temperature, which remains constant in isothermal process.

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Top 150 NEET physics MCQs With Detailed Answers

Top 150 NEET Physics MCQs With Detailed Answers

Introduction

Contents

Sample MCQs

Mechanics

Thermodynamics

Electrodynamics

Optics

Modern Physics

Conclusion

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