1.
Two bulbs are fitted in a room in the domestic electric installation. One of them glows brighter than the other. Then
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
Answer: Option 'D'
all of the above
3.
Total internal reflection can take place when light travels from
Answer: Option 'B'
Diamond to glass
4.
Pick out the only vector quantity
Answer: Option 'B'
impulse
5.
It is more difficult to walk on ice than on a concrete road because
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
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
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
Answer: Option 'A'
potential
9.
Buoyancy depends on
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
Answer: Option 'C'
273K
11.
SI unit of temperature is
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
Answer: Option 'B'
decreased by 4%
13.
Curie is the unit of
Answer: Option 'B'
radio activity
14.
In a freezer ice cubes will be formed more quickly in trays made of
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
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.