set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

When does heart rest?

a) Between two beats

b) Never

c) While sleeping

d) While doing yoga

Question : 2

No pain is felt while cutting the nails because

a) Nails are made of calcium phosphate

b) Nails are made of the material of dead cells in which there is no blood circulation

c) Nails are a useless part of the body

d) None of the above

Question : 3

The amount of which of the following components in the air does not change in the process of respiration?

a) Water vapours

b) Carbon dioxide (CO₂)

c) Oxygen

d) Nitrogen

Question : 4

At the age of 20 years, the number of bones in human body is approximately

a) 300

b) 100

c) 200

d) None of these

Question : 5

The temperature of the human body

a) Neither decreases in winters nor increases in summers

b) Decreases in winters

c) Increases in summers

d) Increases in winters

Question : 6

Where is the governing centre of reflex action located?

a) In spinal cord

b) In cerebrum

c) In cerebellum

d) In nerve cells