Air is

• always a compound

• always a mixture

• a compound in pollution-free zones

• a mixture in industrial zones

Which of the following labeled points in the figure given above indicate the unstable state of an object?

• Point A only

• Point B only

• Points A and C

• Points B and D

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

Which one among the following is the true representation of (i) variable DC potential (ii) rheostat and (iii) AC ammeter respectively?

In India, distribution of electricity for domestic purpose is done in the form of

• 220 V; 50 Hz

• 110 V; 60 Hz

• 220 V; 60 Hz

• 110 V; 50 Hz