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
Q. Food is cooked in a pressure cooker quickly because -
1) Boiling point of water decreases
2) Boiling point of water increases
3) It absorbs heat quickly
4) It retains heat for a longer duration
Q. A transformer is used to -
1) Increase DC voltage
2) Increase or decrease AC voltage
3) Decrease DC voltage
4) Convert DC into AC
Q. Convex lenses are used for the correction of -
1) Long-sightedness
2) Short-sightedness
3) Cataract
4) None of these
Q. When the velocity of a body is doubled -
1) Its K.E. is doubled
2) Its acceleration is doubled
3) Its P.E. is doubled
4) Its momentum is doubled
Q. A bag is dropped From an aeroplane flying horizontally at a constant speed. Neglecting air resistance, where will the aeroplane be when the bag reaches the ground?
1) Data is not sufficient
2) Behind the bag
3) Ahead of the bag
4) Directly above the bag
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