CBSE Class 6 Science Around Us VBQs

Choose The Correct Answer.

Question. Moving air is known as:
a) Wind
b) Water vapour
c) Ozone
d) Wind mill
Answer : A

Question. Air contains highest percentage of which gas?
a) Oxygen
b) Nitrogen
c) Smoke
d) Carbon dioxide
Answer : B

Question. Earthworms come out of soil during:
a) Heavy rains
b) Cold weather
c) Snow
d) Hot weather
Answer : A

Question. Which gas is a supporter of combustion?
a) Nitrogen
b) Carbon dioxide
c) Smoke
d) Oxygen
Answer : D

Fill In The Blanks.

a). Plants gives out oxygen gas and breathe in carbon dioxide gas.

b). Nitrogen gas cannot be used directly from the atmosphere.

c). Earth is protected from the harmful rays of sun by ozone layer.

d). Atmosphere is important for the water cycle.

Write True Or False.

Question. Carbon dioxide gas is required for the burning of fuel. 
Answer : False

Question. Air contains equal amount of oxygen and nitrogen. 
Answer : False

Question. Oxygen gas protects us from the harmful UV rays of the sun. 
Answer : False

Question. Aquatic animals breathe carbon dioxide which is dissolved in water. 
Answer : False

Question. Composition of air always remain the same. 
Answer : False

Match The Column:-

Answer : (1) - (d), (2) - (c), (3) - (e), (4) - (b), (5) - (a), 

 

Very Short Answer Type Questions.

Question. Name one component of air that does not support burning.
Answer : Carbon dioxide.

Question. Which gas is essential for breathing of animals?
Answer : Oxygen.

Question. Name the components of air.
Answer : Air consists of various gases like nitrogen (78%), oxygen (21%), carbon dioxide (0.03%), some noble gases and water vapours etc.

Short Answer Type Questions.

Question. Why does a lump of cotton wool shrink in water?
Answer : Lump of cotton wool has air among gaps of cotton fibres. When water replaces the air from these gaps, the cotton lump becomes heavy and also shrinks due to removal of air gaps..

Question. Which gas in the atmosphere is essential for respiration?
Answer : Oxygen gas.

Question. How will you show that air dissolves in water?
Answer : Heat the glass vessel filled with water. Before they start boiling bubbles occur, these bubbles are due to air present in water. This experiment concludes air is present in the water.

Long Answer Type Questions.

Question. How will you show that air supports burning?
Answer : (a) Take a small burning candle. (b) Cover the burning candle with a glass jar. After few minutes the candle is extinguished. This experiment proves that air supports burning.

Question. How is the balance of carbon dioxide and oxygen gases are maintained in the atmosphere?
Answer : Animals and plants use oxygen from air during respiration and release carbon dioxide gas in air. But green plants release oxygen gas by using carbon dioxide during photosynthesis.