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IIT JEE Physics Practice Test Questions
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IIT JEE Physics Practice Test Questions
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1. Two satellites A and B move round the earth in the same orbit. The mass of B is twice the mass of A. Which of the following is correct?
2. A freshly prepared radioactive source of half life 2 hrs emits radiation of intensity which is 32 times the permissible safe value of intensity. Which of the following is the minimum time after which it would be possible to work safely with this source?
3. There are two concentric metal shells of radii r1 and r2(>r1). If the outer shell has a charge q and the inner shell is grounded, the charge on the inner shell is
4. Two satellites of masses m1 and m2(m1 > m2) are revolving round the earth in circular orbits of radii r1 and r2 (r1 > r2) respectively. Which of the following statements is true regarding their speeds v1 and v2 ?
5. Two satellites are orbiting around the earth in circular orbits of same radius. One of them is 10 times greater in mass than the other. Their period of revolutions are in the ratio
6. A beam of electrons accelerated by a large potential difference V is made to strike a metal target to produce X-rays. For which of the following values of V, the resulting X-rays have the lowest minimum wave length:
7. An alternating voltage E (in volts) = 200√2 sin (100t) is connected to a 1 μF capacitor through an a.c. ammeter. The reading of the ammeter shall be
8. The velocity of a transverse wave in a string does not depend on
9. The ionisation energy of the ionised sodium atom Na+10 is :
10. Kepler’s third law of planetary motion provides information about
11. The escape velocity of a particle of mass m varies as:
12. Let V and E be the gravitational potential and gravitational field at a distance r from the centre of a uniform spherical shell. Consider the following two statements
A. The plot of V against r is discontinuous and
B. The plot of E against r is discontinuous.
13. If I is the moment of inertia of a solid body, the change in l corresponding to a small change in temperature is
14. Energy required to accelerate a car from 10 to 20 m/s compared with that required to accelerate from 0 to 10 m/s is
15. The X-ray beam emerging from an X-ray tube
16. A person brings a mass of 1 kg from infinity to a point A. Initially the mass was at rest but it moves at a speed of 2 m/s as it reaches A. The work done by a person on the mass is –3J. The potential at A is:
17. The total energy of the electron in the hydrogen atom in the ground state is -13.6 eV. Which of the following is its kinetic energy in the first excited state?
18. In a series L, R, C, circuit which is connected to a.c. source. When resonance is obtained then net impedance Z will be
19. In a series R, L, C circuit XL = 10Ω , XC = 4Ω and R = 6Ω. Find the power factor of the circuit.
20. A particle moves towards a concave mirror of focal length 30 cm along its axis and with a constant speed of 4 cm/ sec. What is the speed of its image when the particle is at 90 cm from the mirror?
21. A massive ball moving with speed v collides with a tiny ball having a mass very much smaller than the mass of the first ball. If the collision is elastic, then immediately after the impact, the second ball will move with a speed approximately equal to:
22. A bomb travelling in a parabolic path under the effect of gravity, explodes in mid air. The centre of mass of fragments will:
23. A simple pendulum has some time period T. What will be the percentage change in its time period if its amplitudes is decreased by 5 % ?
24. The ionisation potential of a hydrogen atom is 13.6 volt. The energy required to remove an electron from the second orbit of hydrogen is:
25. An ice cube contains a glass ball. The cube is floating on the surface of water contained in a trough on the surface of water contained in a trough. What will happen to the water level, when the cube melts?

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