Which one among the following is an electrochemical cell that cannot be charged?

• Electrolytic cell

• Storage cell

• Primary cell

• Fuel cell

Which one among the following is the correct order of power consumption for the light of equal intensity?

• CFL tube < Fluorescent tube < Incandescent bulb < Light emitting diode

• Light emitting diode < CFL tube < Fluorescent tube < Incandescent bulb

• CFL tube < Fluorescent tube < Light emitting diode < Incandescent bulb

• Incandescent bulb < Light emitting diode < Fluorescent tube < CFL tube

One feels heavier in a lift when the lift

• is going down steadily

• just begins to go up

• is moving up steadily

• descends freely

A swinging pendulum has its maximum acceleration at

• the bottom of the swing

• the two extremities of the swing

• every point on the swing

• no particular portion of the pendulum

Which one among the following statements about thermal conductivity is correct?

• Steel> Wood> Water

• Steel> Water> Wood

• Water> Steel> Wood

• Water> Wood > Steel

The process of nuclear fusion in the sun requires

• very high temperature and very high pressure

• low temperature and high pressure

• high temperature and low pressure

• very high temperature and no pressure

The earth's magnetic field is approximately

• 1 Tesla

• 2 Gauss

• 10⁴ Tesla

• 1 Gauss

Yellow colour light is used as fog light because yellow colour

• light is most scattered by fog

• has the longest wavelength among all colours

• has the longest wavelength among all colours except red and orange but the red colour is already used for brake light and stop light whereas orange colour is avoided due to its similarity with red

• has the shortest wavelength among all colours not already reserved for other purpose

69.

A hot object loses heat to its surroundings in the form of heat radiation. The rate of loss of heat depends on the

• temperature of the object

• temperature of the surroundings

• temperature difference between the object and its surroundings

• average temperature of the object and its surroundings

Consider the following statements :

1. Diamond is hard and graphite is soft.
2. Diamond is soft and graphite is hard.
3. Diamond is a bad conductor but graphite is a good conductor.
4. Diamond is a good conductor but graphite is a bad conductor.

Which of the statements given above is/are correct?

• 1 and 3

• 1 only

• 2 and 3

• 1 and 4