Q. Which one of the following statements about the aperture of a convex lens is correct?
1) It is equal to its radius of curvature
2) It is equal to its focal length
3) It is independent of its radius of curvature
4) It is equal to half of its focal length
Q. If an object is placed at the focus of a convex lens, its image is -
1) at the focus on the same side
2) at the focus on the opposite side
3) coincident with the lens
4) at infinity
Q. An object is dropped from a height onto the floor. Which one of the following remains uniform as it falls?
1) Its acceleration
2) Its momentum
3) Its kinetic energy
4) Its potential energy
Q. In the joining of railway tracks, iron oxide is made to react with -
1) Aluminium
2) Zinc
3) Copper
4) Tin
Q. A metal wire of length l and diameter d has a resistance R. What would be the resistance of another wire of the same metal and of the same length but having double the diameter?
1) R
2) R/4
3) R/2
4) 2R
Q. The device used for measuring electric current in a circuit is called -
1) Ammeter
2) Motor
3) Voltmeter
4) Generator
Q. The pitch of a sound wave depends upon which one of its following characteristics?
1) Speed
2) Loudness
3) Amplitude
4) Frequency
Q. If an object of mass 10 kg is moving with a uniform speed of 10 m/s, then the linear momentum and the kinetic energy of the object, respectively, are -
1) 100 N.s and 500 J
2) 100 N.s and 1000 J
3) 200 N.s and 500 J
4) 200 N.s and 1000 J
Q. School bells are made of metals because metals are -
1) Malleable
2) Sonorous
3) Ductile
4) Lustrous
Q. Which one of the following pairs of metals is a very good conductor of heat?
1) Silver and Copper
2) Silver and Lead
3) Copper and Mercury
4) Lead and Mercury
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