Mass of B is four times that of A. B moves with a velocity half that of A. Then B has:

• kinetic energy equal to that of A.

• half the kinetic energy of A.

• twice the kinetic energy of A.

• kinetic energy one-fourth of A

In a pressure, cooker cooking is faster because of the increase in vapour pressure

• increase the specific heat

• decreases the specific heat.

• decreases the boiling point

• increases the boiling point

Magnets attract magnetic substances such as iron, nickel, cobalt etc. They can also repel:

• paramagnetic substances

• ferromagnetic substances

• diamagnetic substances.

• non-magnetic substances

When a ray of light is going from one medium to another, it:

• wavelength remains same

• frequency remains the same.

• frequency increases

• wavelength increases.

Which of the following statements about diamonds are correct?

1. It is used as a gem in jewellery because of its ability to reflect light
2. It is a good conductor of electricity.
3. It is used for cutting glass, marble stones and other hard materials
4. It is used for drilling of rocks

Select the correct answer using the code given below:

• 1, 3 and 4

• 2, 3 and 4

• 1, 2 and 3

• 2 and 4 only

Sound moves with higher velocity if:

• pressure of the medium is decreased

• temperature of the medium is increased

• the humidity of the medium is increased

• both B and C above

Which one of the following is the correct angle between the incident and reflected rays when a ray of light incident normally on a plane mirror?

• 180°

• 90°

• 45°

• 0°

Which one of the following four glass lenses is a diverging lens?

The magnetism of a bar magnet can be destroyed if it is:

1. kept in the magnetic meridian
2. placed in a direction opposite that of the Earth's horizontal intensity.
3. heated to a temperature known as Curie temperature

Select the correct answer using the code given below:

• 1 and 3 only

• 2 only

• 2 and 3 only

• 1,2 and 3

The capacity of a parallel plate condenser can be doubled by:

1. doubling the areas of the plates
2. doubling the distance of separation between the plates
3. reducing the distance of separation between the plates to half the original separation
4. doubling both the areas of the plates and the distance of separation between the plates

Select the correct answer using the code given below:

• 1 and 4

• 1 and 3

• 3 only

• 2 and 3