Q. The free surface of a liquid behaves like a sheet and tends to contract to the smallest possible area due to the -
1) Force of adhesion
2) Force of friction
3) Centrifugal force
4) Force of cohesion
Q. The steel of more elastic than rubber because -
1) its density is high
2) it is a metal
3) the ratio of stress to strain is more
4) the ratio of stress to strain is less
Q. A transistor is most likely to be found in a -
1) Fuse
2) Fluorescent lamp
3) Hearing aid
4) Wristwatch
Q. Radioactive substances can be produced readily in -
1) an electron gun
2) an atomic pile
3) a transistor
4) a Wilson cloud chamber
Q. The volume of which of the following materials decreases when it is heated from 0° C to 5° C?
1) Air
2) Copper
3) Water
4) Mercury
Q. A triode differs from a diode in the way that -
1) it can amplify a signal
2) it has a vacuum inside
3) it has a heated cathode
4) the photoelectric effect causes it's current
Q. The element of an electric stove is made of -
1) copper
2) aluminium
3) magnalium
4) nicrome
Q. Which of the following sounds cannot be heard by the human ear?
1) 300 vibrations/sec
2) 1,000 vibrations/sec
3) 10,000 vibration/sec
4) 30,000 vibrations/sec
Q. A photo-electric cell converts -
1) Sound energy into electrical energy
2) Light energy into electrical energy
3) An electrical signal into sound waves
4) Electrical energy into light energy
Q. Gold and copper happen to absorb ......... and violet light, leaving yellow light.
1) green
2) blue
3) red
4) orange
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