Q. The Freezer in a refrigerator is located at the top section because -
1) The entire chamber of the refrigerator is cooled quickly due to convection
2) The motor is protected from heating
3) The heat gained from the environment is high
4) The heat gained from the environment is low
Q. If the potential difference between the ends of a fixed resistor is halved, the electric power will become -
1) double
2) half
3) four time
4) one by four times
Q. If a current is passed through a spring, then the spring will -
1) expand
2) compress
3) remain same
4) first expand then compress
Q. The twinkling of stars is due to -
1) Atmospheric refraction of star light
2) Scattering of light by dust particles
3) Dispersion of light by water drops
4) Reflection of light by clouds
Q. Which one of the following is an Acoustic unit?
1) Calorie
2) Decibel
3) Ampere
4) Volt
Q. Which of the following rays contain positively charged particles?
1) β rays
2) γ rays
3) x rays
4) α rays
Q. Nuclear fusion is related to?
1) Heavy nucleus splitting
2) Heavy nuclei combining
3) Light nucleus splitting
4) Light nuclei combining
Q. When the temperature difference between liquid and its surroundings is doubled, the rate of loss of heat will -
1) Double
2) Remain same
3) Three times
4) Four times
Q. The weight of a body at the centre of earth is -
1) half the weight at the surface
2) Infinite
3) zero
4) twice the weight at the surface
Q. The distance covered by an object depends upon -
1) Initial velocity
2) Final velocity
3) Acceleration velocity
4) Constant velocity
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