## Download our App

### JEE Mains Previous Years Questions with Solutions

4.5
star star star star star
(100k+ download)
1

### AIEEE 2002

MCQ (Single Correct Answer)
Even Carnot engine cannot give $100\%$ efficiency because we cannot
A
prevent radiation
B
find ideal sources
C
reach absolute zero temperature
D
eliminate friction.

## Explanation

$\eta = 1 - {{{T_2}} \over {{T_1}}}$
For $\eta = 1$ or $100\%$, ${T_2} = 0K.$
The temperature of $0$ $K$ (absolute zero) can not be obtained.
2

### AIEEE 2002

MCQ (Single Correct Answer)
Cooking gas containers are kept in a lorry moving with uniform speed. The temperature of the gas molecules inside will
A
increase
B
decrease
C
remain same
D
decrease for some, while increase for others

## Explanation

Since pressure and volume are not changing, so temperature remains same.
3

### AIEEE 2002

MCQ (Single Correct Answer)
If mass-energy equivalence is taken into account, when water is cooled to form ice, the mass of water should
A
increase
B
remain unchanged
C
decrease
D
first increase then decrease

## Explanation

When water is cooled to form ice, energy is released from water in the form of heat. As energy is equivalent to mass therefore when water is cooled to ice, its mass decreases.
4

### AIEEE 2002

MCQ (Single Correct Answer)
Which of the following is more close to a black body?
A
black board paint
B
green leaves
C
black holes
D
red roses

## Explanation

Black board paint is quite approximately equal to black bodies.

### Joint Entrance Examination

JEE Advanced JEE Main

### Graduate Aptitude Test in Engineering

GATE CSE GATE EE GATE ECE GATE ME GATE CE GATE PI GATE IN

NEET

Class 12