Physics Quiz - Competitive Exams JEE

Free practice quiz: Physics (Competitive Exams JEE). 74 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This Competitive Exams JEE practice quiz has 74 multiple-choice questions on Physics. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. A particle starts from rest with uniform acceleration 2 m/s². The distance traveled in the 5th second is:

   1. 18 m
   2. 10 m
   3. 9 m
   4. 25 m
   Show answer

   Answer: C. 9 m

2. The resonant frequency of a series LCR circuit is:

   1. 1/(2πLC)
   2. 1/(2π√(LC))
   3. √(LC)/(2π)
   4. 2π√(LC)
   Show answer

   Answer: B. 1/(2π√(LC))

3. A satellite orbits Earth in a circular orbit of radius r. If the gravitational force is proportional to 1/r², the total mechanical energy of the satellite is proportional to:

   1. 1/r²
   2. 1/r
   3. -1/r
   4. -1/r²
   Show answer

   Answer: C. -1/r

4. The pressure inside a soap bubble of radius r and surface tension T exceeds the outside pressure by:

   1. 2T/r
   2. 4T/r
   3. T/2r
   4. T/r
   Show answer

   Answer: B. 4T/r

5. A current-carrying wire is bent into a circular arc of radius R subtending an angle of 90° at the center. The magnetic field at the center is:

   1. μ₀I/4πR
   2. μ₀I/4R
   3. μ₀I/2R
   4. μ₀I/8R
   Show answer

   Answer: D. μ₀I/8R

More questions in this quiz

Answers and explanations are in the full quiz.

1. For a projectile launched at angle θ with the horizontal, the ratio of maximum height H to horizontal range R is:
2. Two masses 3 kg and 5 kg are connected by a light string over a frictionless pulley. The acceleration of the system is (g = 10 m/s²):
3. A 2 kg body moving at 10 m/s is brought to rest by a constant force in 5 m. The work done by the force is:
4. The ratio of moments of inertia of a uniform rod about an axis through its end perpendicular to its length to that about an axis through its center perpendicular to its length is:
5. If the mass of Earth is doubled keeping radius the same, the escape velocity from its surface becomes:
6. A simple pendulum of length L is in a lift accelerating upward with acceleration a. Its time period is:
7. The speed of sound in an ideal gas at absolute temperature T is proportional to:
8. In an adiabatic compression of an ideal gas, which of the following is true?
9. The electric field due to an infinite line charge of linear charge density λ at perpendicular distance r is:
10. The energy stored in a capacitor is E. If the potential difference across it is doubled, the stored energy becomes:
11. In a conductor, if the current is doubled and the cross-sectional area is halved, the drift velocity of electrons becomes:
12. A charged particle moving perpendicular to a uniform magnetic field follows a circular path. The work done by the magnetic force in one full revolution is:
13. Lenz's law is a consequence of:
14. The critical angle for a medium of refractive index 1.5 with respect to air is approximately:
15. A metal has work function 2 eV. If light of photon energy 5 eV is incident, the maximum kinetic energy of emitted photoelectrons is:
16. A radioactive sample has half-life 10 days. The fraction remaining after 30 days is:
17. Zener diode is generally used as:
18. The dimensional formula of Planck's constant is:
19. Bernoulli's theorem is based on conservation of:
20. Young's modulus of a material has the same dimensions as:
21. Two tuning forks of frequencies 256 Hz and 260 Hz are sounded together. The beat frequency is:
22. Newton's law of cooling states that the rate of cooling of a body is proportional to:
23. An ice skater rotating with arms outstretched pulls her arms inward. Assuming no external torque, which quantity remains constant?
24. The dimensional formula of angular momentum is:
25. A block of mass m is placed on a rough inclined plane with angle of inclination θ. If the coefficient of static friction is μ, the minimum force parallel to the incline required to just prevent the block from sliding down is:
26. Kepler's second law is a direct consequence of:
27. Which of the following is a scalar quantity?
28. The terminal velocity of a small spherical ball falling through a viscous fluid depends on its radius r as:
29. A Carnot engine operates between reservoirs at 500 K and 300 K. Its efficiency is:
30. A wire is stretched by 0.1% of its original length. The percentage increase in its electrical resistance (assuming volume constant) is approximately:
31. Three resistors of 2 Ω, 3 Ω, and 6 Ω are connected in parallel. The equivalent resistance is:
32. A galvanometer of resistance G is converted into an ammeter of range I by connecting a shunt resistance S. The value of S is given by:
33. The magnetic field at the center of a circular coil of radius R carrying current I and having N turns is:
34. A series LCR circuit has L = 1 H, C = 1 μF, and R = 100 Ω. The quality factor Q of the circuit is:
35. The phenomenon responsible for the blue colour of the sky is:
36. In a Young's double-slit experiment, if the separation between the slits is halved and the distance between slits and screen is doubled, the fringe width becomes:
37. The energy of an electron in the nth orbit of a hydrogen atom is proportional to:
38. If the momentum of a particle is doubled, its de Broglie wavelength becomes:
39. In a p-n junction diode under reverse bias, the width of the depletion layer:
40. The number of significant figures in 0.00320 is:
41. A particle executes simple harmonic motion with amplitude A. At what displacement from the mean position is its kinetic energy equal to its potential energy?
42. A black body at temperature T emits radiation with maximum intensity at wavelength λ. If the temperature is doubled, the wavelength of maximum intensity becomes:
43. The internal resistance of a cell of emf 2 V is 0.5 Ω. The maximum power that can be delivered to an external resistance is:
44. A body is thrown vertically upwards with velocity u. The time taken to reach the highest point is:
45. The equivalent capacitance of two capacitors C₁ and C₂ connected in series is:
46. A car accelerates uniformly from rest and covers 100 m in 5 s. What is its acceleration?
47. A ball is thrown horizontally from a height of 20 m with a speed of 15 m/s. How far from the base of the cliff does it land? (Take g = 10 m/s²)
48. A block of mass 2 kg is pulled up a frictionless incline of angle 30° by a force parallel to the incline. What force is required to move it with constant velocity? (g = 10 m/s²)
49. A body of mass 1 kg moving at 4 m/s collides head-on with a stationary 3 kg body. If they stick together, what is the loss in kinetic energy?
50. A solid cylinder of mass M and radius R rolls without slipping down an incline. What is its acceleration?
51. The gravitational potential energy of a satellite of mass m in a circular orbit of radius r around Earth (mass M) is:
52. A wire of length L and mass M is under tension T. The speed of a transverse wave on the wire is:
53. An ideal gas undergoes an isothermal expansion. Which statement is correct?
54. Two point charges +q and -q are separated by distance 2a. The electric potential at the midpoint of the line joining them is:
55. A parallel plate capacitor is charged and then disconnected from the battery. If a dielectric of constant K is inserted, the energy stored:
56. A coil of area A and N turns rotates in a uniform magnetic field B with angular velocity ω. The maximum induced emf is:
57. In an AC circuit containing only an ideal inductor, the current:
58. A convex lens of focal length 20 cm forms a real image at 60 cm. The object distance is:
59. Light of wavelength λ in air enters a medium of refractive index n. Its wavelength inside the medium becomes:
60. The threshold wavelength for photoelectric emission from a metal is 600 nm. If light of 300 nm is used, the maximum kinetic energy of emitted electrons is:

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