Explore topic-wise MCQs in Science.

This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Science knowledge and support exam preparation. Choose a topic below to get started.

1.

Read the two sentences given in the box. (i) The compressed air in a tyre exerts a force large enough to lift a heavy car. (ii) In a syringe, the plunger compresses the liquid.

A.  Both the statements are true.
B.  Both the statements are false.
C. Turtle
D.  Statement (i) is false but statement (ii) is true.
Answer» D.  Statement (i) is false but statement (ii) is true.
Discussion
2.

Which of the following methods need air?

A.  Hand picking
B.  Sieving
C. Both A & B are true 
D.  Filtration
Answer» D.  Filtration
Discussion
3.

DIRECTIONS: Read the passage(s) given below and answer the questions that follow Passage - 3 If in a closed room there is some material that is burning, you may have felt suffocation. This is due to excess carbon dioxide that may be accumulating in the room. Plants and animals consume oxygen for respiration and produce carbon dioxide. Assertion (A): The gases nitrogen and oxygen together make 90% (by volume) of air. Reason (R): Air contains some dust particles.

A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is not the correct explanation of A.
C. Snakes
D. A is false but R is true.
Answer» E.
Discussion
4.

Glass panes usually appear hazy because

A.  water vapour settles on tiny dust particles on glass surfaces.
B.  chemical reactions take place on the glass surfaces.
C. Flippers 
D.  they have been used over a long time.
Answer» B.  chemical reactions take place on the glass surfaces.
Discussion
5.

DIRECTIONS: Read the passage(s) given below and answer the questions that follow Passage - 1 Until eighteenth century, people thought that air was just one substance. Now it has been experiment all proved that it is really not so. Air is a mixture of gases. Which of the following statement(s) is/are correct?

A. Water is present in air in vapour form
B. Water is not present in air
C. Carnivorous animals eat flesh of dead and decaying animals only
D. Water is present in air in solid form
Answer» B. Water is not present in air
Discussion
6.

DIRECTIONS: Match Column-I with Column-II and select the correct answer using the codes given below the columns. Column-I (Name of gas in Air) Column-II (% age of gas in air) A. Oxygen (p) 20% B. Nitrogen (q) 79% C. Carbon dioxide (r) 0.04% D. Other gases (s) Less than 1%

A. \[A\to (p);B\to (q);C\to (r);D\to (s)\]
B. \[A\to (q);B\to (p);C\to (r);D\to (s)\]
C.  Crocodile
D. \[A\to (q);B\to (p);C\to (s);D\to (r)\]
Answer» B. \[A\to (q);B\to (p);C\to (r);D\to (s)\]
Discussion
7.

An animal placed in an air tight jar is kept in sunlight as shown in the figure. How can the animal be helped to survive for a longer time?

A.  By placing another mouse in it
B.  By placing a green plant in it
C. Nymph
D.  By placing a burning candle in it
Answer» C. Nymph
Discussion
8.

When we heat water, we find bubbles coming from it. This shows that

A.  water contains air.
B.  air contains water.
C.     
D.  water contains dissolved minerals.
Answer» B.  air contains water.
Discussion
9.

Which of the following can reduce air pollution?

A. Planting more trees on roadsides
B. Using CNG in vehicles
C.     
D. All of the above
Answer» E.
Discussion
10.

What can be said about the nature of air?

A.  Air is heterogeneous.
B.  Air is a compound.
C.  Tiger   
D.  Air is an alloy.
Answer» D.  Air is an alloy.
Discussion
11.

Lime water turns milky when exposed to air. This shows that air contains

A.  carbon dioxide.
B.  hydrogen.
C.     Crocodiles, lizards and turtles use their legs to crawl on the ground.
D.  oxygen.
Answer» B.  hydrogen.
Discussion
12.

Which of the following gases cause the harmful greenhouse effect?

A.  Hydrogen
B.  Oxygen
C.     p-iv, q-iii, r-ii, s-i
D.  Nitrogen
Answer» D.  Nitrogen
Discussion