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1451. Consider the following metals : 1. Uranium 2. Radium3. PlutoniumWhich of these are used in making nuclear weapons ?
A. 1 and 2
B. 1, 2 and 3
C. 2 and 3
D. 1 and 3
Explanation:
1452. On which of the following factors does the temperature of steam in a pressure cooker depend /
A. Material of which cooker is made
B. Temperature of the flame
C. Quantity of cooking material
D. Size of the pressure
Explanation:
1453. Why are two blankets warmer than one ?
A. Two blankets have more wool and hence, provide greater warmth
B. Two blankets enclose air which does not allow the cold to penetrate
C. Two blnkets compress the air in between the body and the blankets and this compression produces that
D. None of these
Explanation:
1454. Whose experiments proved that the speed of light was always the same ?
A. James Clark Maxwell
B. Michelson and Morley
C. Miller and Stanley
D. Warner Heisenberg
Explanation:
1455. Small drops of a liquid are spherical in shape because :
A. the earth attracts all the particles of the drop equally
B. for a given volume, the surface area of a sphere is maximum
C. the surface energy is maximum for the spherical shape
D. the surface energy is minimumd for the spherical shape
Explanation:
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