When an electric bulb breaks, there is a mild bang due to _____.

1. 1. The compressed gases rushing out suddenly
   2. The air rushing in to fill the evacuated space
   3. The chemical reaction between the enclosed gases
   4. None of these

A small weight is put on the pressure cooker. It increase the pressure of the steam because _____.

1. 1. The weight stops the steam from escaping
   2. Of Bernoulli’s principle
   3. the weight is proportionate to the steam required
   4. Area of contact is small 

A liquid rises in a syringe when its piston is pulled up because _____.

1. 1. Of the action of atmospheric pressure
   2. There is a force of cohesion between the liquid molecules and the glass syringe
   3. Of the property of surface tension
   4. Of capillary action

A silver spoon and a book are both at room temperature. The spoon feels colder to the touch because _____.

1. 1. Silver is an almost pure material
   2. Of an illusory effect
   3. Silver is a very good heat conductor
   4. It is made of a denser material

Aviation fuel for jet aeroplanes consists of purified _____.

1. 1. Kerosene
   2. Gasoline
   3. Diesel
   4. Petrol

Optic fibers are mainly used for which of the following?

1. 1. Weaving
   2. Communication
   3. Musical instruments
   4. Food industry

In an atomic explosion, enormous energy is released which is due to the _____.

1. 1. Conversion of chemical energy into nuclear energy
   2. Conversion of chemical energy into heat energy
   3. Conversion of mass into energy
   4. Conversion of neutrons into protons

Which of the following is good nuclear fuel?

1. 1. Plutonium-239
   2. Neptunium-239
   3. Uranium-238
   4. Thorium-236

Which of the following is used as a coolant in unclear reactors?

1. 1. Graphite
   2. Heavy water
   3. Cadmium
   4. Liquid sodium

Two cars, passing each other at high speed, are in danger of side swiping because _____.

1. 1. Of decrease in the velocity of air molecules between them
   2. Of decrease in air pressure in the space between them
   3. Increase n the velocity of air molecules between them
   4. Of the increase in air pressure int he space between them