Metals are good conductors of electricity because:
They contain free electrons.
The atoms are lightly packed.
Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to:
The heating effect of current alone
Hysteresis loss alone
100 is formed by?
Siphon will fail to work if:
The densities of the liquid in the two vessels are equal.
The level of the liquid in the two vessels are at the same height.
Nuclear sizes are expressed in a unit named
Which of the following terms is not used in the field of physics?
Light from the Sun reaches us in nearly
Pick out the scalar quantity
Light year is a unit of
Rectifiers are used to convert:
Direct current to Alternating current
Alternating current to Direct current
Pa(Pascal) is the unit for
The absorption of ink by blotting paper involves:
Viscosity of ink
Capillary action phenomenon
Planets do not twinkle because
They emit light of a constant intensity
Their distance from the earth does not change with time
Stars appears to move from east to west because
All stars move from east to west
The earth rotates from west to east
Radiocarbon is produced in the atmosphere as a result of
Collision between fast neutrons and nitrogen nuclei present in the atmosphere.
Action of ultraviolet light from the sun on atmospheric oxygen.
It is easier to roll a stone up a sloping road than to lift it vertical upwards because
Work done in rolling is more than in lifting.
Work done in lifting the stone is equal to rolling it.
101 is formed by?
Mirage is due to:
Unequal heating of different parts of the atmosphere
Magnetic disturbances in the atmosphere
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