Q. An AC current can be produced by -
1) transformer
2) dynamo
3) choke coil
4) None of the above
Q. Two objects of different masses falling freely near the surface of the Moon would -
1) undergo a change in their inertia
2) have same velocity at any instant
3) experience forces of same magnitude
4) have different accelerations
Q. Which of the following liquids is a bad conductor of electricity?
1) Lemon juice
2) Orange juice
3) Salted water
4) None of the above
Q. A photoelectric cell is a device which -
1) stores light energy
2) converts electric energy into light energy
3) converts light energy into electric energy
4) None of the above
Q. The image formed by the concave mirror is real, inverted, and of the same size as that of the object. The position of the object should be -
1) at the centre of curvature
2) between the focus and centre of curvature
3) beyond the centre of curvature
4) at the focus
Q. Myopia and Hypermetropia can be respectively corrected by -
1) Plano-concave and Cylindrical lens
2) Convex and Concave lens
3) Concave and convex lens
4) Concave and Cylindrical lens
Q. In the universe, what are pulsars?
1) Rotating neutron stars
2) Explosion of a star
3) Radio waves emitted by a star
4) A group of stars
Q. Concerning the sound waves, consider the following statements:
1. Sound waves do not need any medium and can travel in a vacuum also.
2. Sound waves are longitudinal waves.
3. In sound wave propagation, the particles do not move from one place to another, but they simply oscillate back and forth about their position of rest.
Which of the statements given above is/are correct?
1) 2 and 3 only
2) 1 and 2 only
3) 3 only
4) 1,2 and 3
Q. Which of the following is the least reactive metal?
1) Sodium
2) Calcium
3) Gold
4) Mercury
Q. Burning of coal is an example of -
1) decomposition reaction
2) double displacement reaction
3) combination reaction
4) displacement reaction
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