Suppose you are standing 1 m in front of a plane mirror. What should be the minimum vertical size of the mirror so that you can see your full image in it?

• 0.50 m

• 2 m

• half of your height

• twice your height

Light travels slower in glass than in air because:

• the refractive index of air is less than that of glass.

• the refractive index of air is greater than that of glass

• the density of glass is greater than that of air.

• density of glass is less than that of air

The lines of force of a uniform magnetic field:

• must be convergent

• must be divergent.

• must be parallel to each other

• intersect.

A Jet engine works on the principle of conservation of

• linear momentum.

• angular momentum

• energy.

• mass

The surface temperature of the Sun is near:

• 2000 K

• 4000 K

• 6000 K

• 8000 K

If the electrical resistance of a typical substance suddenly drops to zero, then the substance is called:

• super conductor.

• semiconductor

• conductor.

• insulator

A spherical air bubble is embedded in a piece of glass. For a ray of light passing through the bubble, it behaves like a:

• converging lens

• diverging lens.

• piano-converging lens.

• plano-diverging lens.

'The stars seem to be higher on the sky than they actually are'. This can be explained by:

• atmospheric refraction

• dispersion of light.

• total internal reflection

• diffraction of light

349.

Which one among the following is not a source of renewable energy?

• Hydroelectricity

• Solar energy

• Fuel cell

• Wind energy

A liquid rises to a certain length in a capillary tube. The tube is inclined to an angle of 45°. The length of the liquid column will:

• increase.

• decrease.

• remain unchanged

• irst decrease and then increase.