CBSE Class 3 Science The Respiratory System MCQs

Question: The lungs are ________ air bags in our chest

a) 2

b) 3

c) 4

d) 5

Answer: 2

Question: The process of taking the air inside the lungs is called

a) inhalation

b) exhalation

c) digestion

d) excretion

Answer: inhalation

Question: When we breathe in air enters the body through the

a) nose

b) windpipe

c) foodpipe

d) ear

Answer: nose

Question: The oxygen is used to get energy from the ________ food

a) digested

b) undigested

c) protective

d) junk

Answer: digested

Question: Carbon dioxide is carried back to the lungs by the

a) blood

b) food

c) urine

d) oxygen

Answer: blood

Question: The process of pushing the air out of lungs is called the

a) exhalation

b) digestion

c) excretion

d) reproduction

Answer: exhalation

Question: The breathing is a part of

a) respiration

b) circulation

c) digestion

d) excretion

Answer: respiration

Question: We need energy to

a) all of these

b) live

c) move

d) grow

Answer: all of these

Question: We should breathe _______ air

a) fresh

b) impure

c) stale

d) polluted

Answer: fresh

Question: Dirty air is said to be

a) polluted

b) fresh

c) pure

d) all of these

Answer: polluted

Question: When we breathe polluted air the substances get into our body

a) harmful

b) useful

c) both

d) none of these

Answer: harmful

Question: Polluted air cause diseases, particularly in the system

a) respiratory

b) circulatory

c) excretory

d) nervous

Answer: respiratory

Question: Polluted air affects our lungs resulting in

a) all of these

b) breathing problem

c) sneezing

d) coughing

Answer: all of these

Question: Attacks of a dangerous lung disease known as

a) asthma

b) inhalation

c) exhalation

d) none of these

Answer: asthma

Question: During diwali air can get very heavily polluted because of

a) firecrackers

b) sounds

c) all of these

d) colours

Answer: firecrackers

Question: The most common disease people suffer from

a) all of these

b) typhoid

c) asthma

d) cold

Answer: all of these

Question: What should we do when we feel cold?

a) wear proper cloth

b) eat ice-cream

c) drink cold-drink

d) all of these

Answer: wear proper cloth

Question: What carry oxygen to all the parts of the body

a) blood

b) saliva

c) urine

d) all of these

Answer: blood

Question: _________ can spread from one person to another

a) cold

b) asthma

c) typhoid

d) all of these

Answer: cold

Question: Lungs can be affected by our

a) none of these

b) seeing

c) posture

d) hearing senses

Answer: none of these

Question: We exhale

a) carbon dioxide

b) nitrogen

c) hydrogen

d) sulphur

Answer: carbon dioxide

Question: Posture means how you

a) both

b) sit

c) stand

d) none of these

Answer: both

Question: Maintaining a straight posture will help you better

a) breathe

b) smell

c) taste

d) hear

Answer: breathe

Question: The respiratory system consists of

a) all of these

b) lungs

c) windpipe

d) nose

Answer: all of these