Question : A bomb explodes on the moon. You will hear its sound on the Earth after _____.

Option 1: 20 minutes

Option 2: 2 hours and 20 minutes

Option 3: 3.7 hours

Option 4: You cannot hear the sound of explosion

Question : Hydrogen bomb is based on the principle of

Option 1: controlled fission reaction

Option 2: uncontrolled fission reaction

Option 3: controlled fusion reaction

Option 4: uncontrolled fusion reaction

Question : Directions: In the question, a part of the sentence is in bold. Below are given alternatives to the bold part at (1), (2), and (3) that may improve the sentence. Choose the correct alternative. In case no improvement is needed, your answer is (4).

No one was there on the platform after the train had left.

(1) No on were there on 

(2) No one was on there

(3) None was there on 

(4) No Improvement

Option 1: (1)

Option 2: (2)

Option 3: (3)

Option 4: (4)

Question : Sound is heard over longer distances on rainy days because

Option 1: sound travels slowly in moist air

Option 2: sound travels faster in moist air

Option 3: moist air does not absorb sound

Option 4: moist air absorbs sound

Question : Burning of coal is an example of_________.

Option 1: decomposition reaction

Option 2: double displacement reaction

Option 3: combination reaction

Option 4: displacement reaction