Electricity and Magnetism

Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to:

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The heating effect of current alone The heating effect of current alone
Hysteresis loss alone Hysteresis loss alone

Light year is a unit of

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Time Time
Distance Distance

Pa(Pascal) is the unit for

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Thrust Thrust
Pressure Pressure

Which of the following terms is not used in the field of physics?

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Latent heat Latent heat
Stock value Stock value

Metals are good conductors of electricity because:

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They contain free electrons. They contain free electrons.
The atoms are lightly packed. The atoms are lightly packed.

The absorption of ink by blotting paper involves:

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Viscosity of ink Viscosity of ink
Capillary action phenomenon Capillary action phenomenon

Rectifiers are used to convert:

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Direct current to Alternating current Direct current to Alternating current
Alternating current to Direct current Alternating current to Direct current

Pick out the scalar quantity

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Force Force
Pressure Pressure

Radiocarbon is produced in the atmosphere as a result of

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Collision between fast neutrons and nitrogen nuclei present in the atmosphere.
Action of ultraviolet light from the sun on atmospheric oxygen.

100 is formed by?

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50+50 50+50
10x50 10x50
70+30 70+30
70+50 70+50

Siphon will fail to work if:

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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.

Light from the Sun reaches us in nearly

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2 minutes 2 minutes
4 minutes 4 minutes

Nuclear sizes are expressed in a unit named

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Fermi Fermi
Angstrom Angstrom

It is easier to roll a stone up a sloping road than to lift it vertical upwards because

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Work done in rolling is more than in lifting.
Work done in lifting the stone is equal to rolling it.

Planets do not twinkle because

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They emit light of a constant intensity They emit light of a constant intensity
Their distance from the earth does not change with time

Mirage is due to:

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Unequal heating of different parts of the atmosphere
Magnetic disturbances in the atmosphere

Stars appears to move from east to west because

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All stars move from east to west All stars move from east to west
The earth rotates from west to east The earth rotates from west to east

Electricity and Magnetism : Question 1 of 17