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MCQs

Total Questions : 10
Question 1.


A football bounces when it falls on the ground because


  1.     it is made up of rubber
  2.     it is hollow
  3.     it is very light and is able to overcome the resistance of air
  4.     of its property of elasticity
 Discuss Question
Answer: Option D. -> of its property of elasticity
:
D

Option:(d)


Question 2.


Fish can survive inside a frozen lake because


  1.     fish are warm blooded animals
  2.     fish hibernate in ice
  3.     water near the bottom does not freeze
  4.     ice is a good conductor of heat
 Discuss Question
Answer: Option C. -> water near the bottom does not freeze
:
C

Option:(c)


Question 3.


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


  1.     its volume decreases uniformly, becoming minimum at 0°C.
  2.     its density increases uniformly, attaining maximum value at 0°C.
  3.     its volume decreases up to 4°C and then increases.
  4.     its density decreases up to 4°C and then increases.
 Discuss Question
Answer: Option C. -> its volume decreases up to 4°C and then increases.
:
C

Option:(c)


Question 4.


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


  1.     iron is at a higher temperature
  2.     iron is darker than wood
  3.     iron absorbs more heat
  4.     iron is a good conductor of heat
 Discuss Question
Answer: Option D. -> iron is a good conductor of heat
:
D

Option:(d)


Question 5.


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?


  1.     0°C
  2.     4°C
  3.     -15°C
  4.     -7.5°C
 Discuss Question
Answer: Option A. -> 0°C
:
A

Option:(a)


Question 6.


The best conductor of heat among liquid is


  1.     Water
  2.     mercury
  3.     ether
  4.     alcohol
 Discuss Question
Answer: Option B. -> mercury
:
B

Option:(b)


Question 7.


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


  1.     from top to bottom
  2.     from bottom to top
  3.     simultaneously throughout the depth
  4.     first on the surface, bottom and sides and then in the interior
 Discuss Question
Answer: Option B. -> from bottom to top
:
B

Option:(b)


Question 8.


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


  1.     rises
  2.     falls
  3.     remains the same
  4.     first rises and then falls
 Discuss Question
Answer: Option C. -> remains the same
:
C

Option:(c)


Question 9.


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


  1.     decrease
  2.     remain the same
  3.     increase
  4.     first increase, then decrease
 Discuss Question
Answer: Option C. -> increase
:
C

Option:(c)


Question 10.


In a sprayer the liquid rises in the tube due to


  1.     capillarity
  2.     evaporation
  3.     lower pressure at the upper end
  4.     unknown reasons
 Discuss Question
Answer: Option C. -> lower pressure at the upper end
:
C

Option:(c)


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