Q. Sound waves travel fastest in -
1) Solids
2) liquids
3) gases
4) vacuum
Q. The power of a lens is measured in -
1) dioptre
2) aeon
3) lumen
4) candela
Q. Lightning can even burn a tree because it contains tremendous amount of -
1) heat energy
2) electric energy
3) chemical energy
4) nuclear energy
Q. Red phosphorus is used in the manufacture of safety matches. This is due to the fact that -
1) it shows phosphorescence
2) at ordinary temperature, it is less reactive than other varieties of phosphorus
3) it cannot be converted to white phosphorus on heating
4) it does not react with halogen on heating
Q. A body is falling freely under the action of gravity alone in vacuum. Which one of the following remains constant during the fall?
1) Potential energy
2) Kinetic energy
3) Total linear momentum
4) Total mechanical energy
Q. X-rays are -
1) deflected by an electric field but not by a magnetic field
2) deflected by a magnetic field but not by an electric field
3) deflected by both a magnetic field and an electric field
4) not deflected by an electric field or a magnetic field
Q. A brick is thrown vertically from an aircraft flying two kilometers above the earth. The brick will fall with a -
1) constant speed
2) constant velcoity
3) constant acceleration
4) constant speed for some time then with constant acceleration as it nears the earth
Q. Which one among the following is not a chemical change?
1) Curding of Milk
2) Ripening of fruit
3) Evaporation of Water
4) Burning of Coal
Q. Which of the following is a mechanical wave?
1) Radio-Waves
2) X-rays
3) Light waves
4) Sound waves
Q. Which pair of following is of Copper alloys?
1) Brass and invar
2) Bronze and Nichrome
3) Brass and Bronze
4) None of the above
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