Physics Questions and Answers

1.

Two bulbs are fitted in a room in the domestic electric installation. One of them glows brighter than the other. Then

   A.) both the bulbs have the same resistance
   B.) the brighter bulb has smaller resistance
   C.) the brighter bulb has larger resistance
   D.) none of these

Answer: Option 'B'

the brighter bulb has smaller resistance

2.

A convex mirror is used to form an image of a real object. The image

   A.) is diminished in size
   B.) is erect
   C.) always lies between the pole and the focus
   D.) all of the above

Answer: Option 'D'

all of the above

3.

Total internal reflection can take place when light travels from

   A.) Water to glass
   B.) Diamond to glass
   C.) Air to water
   D.) Air to glass

Answer: Option 'B'

Diamond to glass

4.

Pick out the only vector quantity

   A.) gravitational potential
   B.) impulse
   C.) pressure
   D.) co-efficient of friction

Answer: Option 'B'

impulse

5.

It is more difficult to walk on ice than on a concrete road because 

   A.) there is very little friction between the ice and feet pressing it
   B.) ice is soft when compared to concrete
   C.) there is more friction between the ice and feer
   D.) None of these

Answer: Option 'A'

there is very little friction between the ice and feet pressing it

6.

Masses of stars and galaxies are usually expressed in terms of

   A.) solar mass
   B.) neutron mass
   C.) earth's mass
   D.) lunar mass

Answer: Option 'A'

solar mass

7.

A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will

   A.) remain unaffected
   B.) increase
   C.) decrease
   D.) have its shape changed

Answer: Option 'B'

The metal ball can be considered  to be made up of several layers of thinner ones. On heating each of these layers will increase in radius. As the inner most layer also increases its radius, the volume inside it i.e, the volume of the hollow portion will also increase.

8.

No current will flow between two charged bodies if they have the same 

   A.) potential
   B.) charge
   C.) resistance
   D.) charge/ potential ratio

Answer: Option 'A'

potential

9.

Buoyancy depends on

   A.) the depth to which the body is immersed
   B.) the shaped of the body
   C.) the mass of the liquid displaced
   D.) the mass of the body

Answer: Option 'C'

the mass of the liquid displaced

Buoyancy or Upthrust, is an upward force exerted by a fluid that opposes the weight of an immersed object.

In a column of fluid, pressure increases with depth as a result of the weight of the overlying fluid.

10.

On the Kelvin scale ,the melting point of ice is

   A.) 373K
   B.) 100K
   C.) 273K
   D.) 0 K

Answer: Option 'C'

273K

11.

SI unit of temperature is

   A.) Kelvin
   B.) Celsius
   C.) Fahrenheit
   D.) Joule

Answer: Option 'A'

Kelvin

12.

In a Cinema hall, the distance between the projector and the screen is increased by 2%. Then the intensity of illumination on the screen is 

   A.) decreased by 2%
   B.) decreased by 4%
   C.) increased by 2%
   D.) increased by 4%

Answer: Option 'B'

decreased by 4%

13.

Curie is the unit of

   A.) temparature
   B.) radio activity
   C.) heat
   D.) energy

Answer: Option 'B'

radio activity

14.

In a freezer ice cubes will be formed more quickly in trays made of 

   A.) aluminium
   B.) rubber
   C.) plastic
   D.) wood

Answer: Option 'A'

Aluminium being a good conductor of heat conducts away the heat from the substance quite easily and causes quick freezing.

15.

If a band is played on the moon the sound will 

   A.) reverberate
   B.) be heard by us faintly
   C.) be heard upto 10 km from it
   D.) not be heard at any distance at all from it

Answer: Option 'D'

As there is no atmosphere surrounding the moon, the second from any band that is played there cannot travel outwards there is no material medium surrounding if for its propagation.

Physics Questions and Answers Download Pdf