Free Physics18 Practice Test - IAS 

Question 1

A football bounces when it falls on the ground because

A. it is made up of rubber
B. it is hollow
C. it is very light and is able to overcome the resistance of air
D. of its property of elasticity

SOLUTION

Solution : D

Option:(d)

Question 2

An iron hammer, lying in the sun, appears much hotter than its wooden handle because

A. iron is at a higher temperature
B. iron is darker than wood
C. iron absorbs more heat
D. iron is a good conductor of heat

SOLUTION

Solution : D

Option:(d)

Question 3

The best conductor of heat among liquid is

A. Water
B. mercury
C. ether
D. alcohol

SOLUTION

Solution : B

Option:(b)

Question 4

What happens when water is cooled from 8°C to 0°C?

A. its volume decreases uniformly, becoming minimum at 0°C.
B. its density increases uniformly, attaining maximum value at 0°C.
C. its volume decreases up to 4°C and then increases.
D. its density decreases up to 4°C and then increases.

SOLUTION

Solution : C

Option:(c)

Question 5

Fish can survive inside a frozen lake because

A. fish are warm blooded animals
B. fish hibernate in ice
C. water near the bottom does not freeze
D. ice is a good conductor of heat

SOLUTION

Solution : C

Option:(c)

Question 6

The temperature of the top of a frozen lake is -15°C. What is the temperature of the water in the lake in contact with the ice layer?

A. 0°C
B. 4°C
C. -15°C
D. -7.5°C

SOLUTION

Solution : A

Option:(a)

Question 7

If water in a lake were to behave like other liquids, then in extremely cold weather it would freeze

A. from top to bottom
B. from bottom to top
C. simultaneously throughout the depth
D. first on the surface, bottom and sides and then in the interior

SOLUTION

Solution : B

Option:(b)

Question 8

When a cube of ice floating on water in a beaker melts, the level of water in the beaker

A. rises
B. falls
C. remains the same
D. first rises and then falls

SOLUTION

Solution : C

Option:(c)

Question 9

On heating a circular metallic disc with a circular hole at the centre, the diameter of the hole will

A. decrease
B. remain the same
C. increase
D. first increase, then decrease

SOLUTION

Solution : C

Option:(c)

Question 10

In a sprayer the liquid rises in the tube due to

A. capillarity
B. evaporation
C. lower pressure at the upper end
D. unknown reasons

SOLUTION

Solution : C

Option:(c)

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