A piece of rubber 10 cm long stretches 6 mm when a load of 100 N is hung from it. What is the strain?

Which metal is commonly used for making an electromagnet?

Kilowatt – hour is a unit of

Find the acceleration of a body of mass 20kg under forces of 3N and 10N acting horizontally in opposite directions.

If the tape of a ticker-timer shows dots equally spaced at 1cm apart and the vibrator makes 50 dots per second, what is the speed of the tape in m/s?

The dimensions of surface tension are

Which of the following is equivalent to Kgm/s?

A particle of  weight 120N is placed on a plane inclined at an angle 30° to the horizontal.
If the plane has an efficiency of 60%, what is the force required to push the weight uniformly up the plane?

Who discovered X-Rays?

In which of the following devices is the expansion of a solid a disadvantage?

I. Simple pendulum   
II. Fire alarms   
III. Thermostat   
IV. Bimetallic thermometer

One of the following readings represents the measurement of the length of a metal rod using vernier callipers.

A single force which produces the same effect as a set of forces acting together at a point is known as the

In order to remove the error of parallax when taking measurements with a meter rule, the eye should be focused

The power source of a ticker-timer vibrates 40 times in one second.
If the ticker-timer made 200 dots during an experiment, determine how long the experiment lasted.

In an elastic collision:

I. Energy is conserved   
II. Energy is decreased   
III. Energy is increased   
IV. Linear momentum is conserved

Fire in the diesel engine is produced by which of the following?

At what temperature will the density of water be maximum?

The lower fixed point corresponds to a length of 20 mm on the stem of a thermometer while the upper fixed point corresponds to 160 mm.
The temperature corresponding to a length of 48 mm is

The resultant force of a couple is

Which of the following pairs of physical quantities comprises vectors?