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
Q. Electric conduction in a semiconductor takes place due to -
1) Electrons only
2) Holes only
3) Both electrons and holes
4) Neither electrons nor holes
Q. Which of the following is not true about X-rays ?
1) have low penetrating power
2) travel with the speed of light
3) can be reflected or refracted
4) can affect photographic plates
Q. The amount of heat required to change the unit mass of a liquid to gaseous state without any change in temperature is known as -
1) Specific heat capacity
2) Mechanical equivalent
3) Latent heat of vaporization
4) Quenching
Q. An optical illusion which occurs mainly in deserts during hot summer is based on the principle of -
1) Reflection
2) Interference
3) Dispersion
4) Total internal reflection
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