A person sitting in an open car moving at constant velocity throws a ball vertically upwards in air. If effect of air resistance is neglected, the ball will fall _____.

1. 1. In the car behind the person
   2. Outside the cars
   3. In the car ahead of the person
   4. Exactly in hands of the person

When light passes from air into glass it experiences change in _____.

1. 1. Frequency, wavelength and speed
   2. Wavelength and speed
   3. Frequency and speed
   4. Frequency and wavelength

A bomb is dropped at a point from a moving aeroplane. the pilot observes that _____.

1. 1. The bomb drops vertically downward
   2. The bomb remains stationary in the air for some time
   3. The bomb traverses a curved path and falls some distance ahead
   4. The bomb  traverses a curved path and falls some distance behind that point

Kinetic energy depends _____.

1. 1. Both mass and velocity of the moving body
   2. The velocity or speed of the moving body
   3. On the mass  of the moving body
   4. Pressure of the moving body

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