### JEE Mains Previous Years Questions with Solutions

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1

### AIEEE 2002

Heat given to a body which raises its temperature by ${1^ \circ }C$ is
A
water equivalent
B
thermal capacity
C
specific heat
D

## Explanation

Heat required for raising the temperature of the whole body by ${1^ \circ }C$ is called the thermal capacity of the body.
2

A
spectrometer
B
pyrometer
C
nanometer
D
photometer

## Explanation

Pyrometer is used to detect infra-red radiation.
3

### AIEEE 2002

Which statement is incorrect?
A
all reversible cycles have same efficiency
B
reversible cycle has more efficiency than an irreversible one
C
Cannot cycle is a reversible one
D
Cannot cycle has the maximum efficiency in all cycles.

## Explanation

All reversible engines working for the same temperature of source and sink have same efficiencies. If the temperatures are different, the efficiency is different.