Which of the following quantities is a scalar quantity?

• Weight

• Impulse

• Young's Modulus

• Acceleration

For every action, there is an equal and and opposite reaction, is Newton's ....................

• First Law

• Second Law

• Third Law

• Fourth Law

Which among the following is false about displacement?

• It can be positive, negative or zero.

• Displacement is never greater than Distance.

• Its SI unit is metre.

• It is always positive.

Who discovered theory of relativity?

• Issac Newton

• Albert Einstein

• Niel Bohr

• Michael Faraday

Which device is used to measure the depth of ocean?

• Lexometer

• Nanometer

• Fathometer

• Hydrometer

A person can jump higher on the Moon's surface than on the Earth because

• the acceleration due to gravity in Moon is smaller than that on the Earth

• the Moon has no atmosphere

• the Moon's surface is rough

• the Moon's surface is rough

The velocity of light is

8.

A seconds pendulum is a pendulum whose time period is

• 4 s

• 3 s

• 2 s

• 2 s

A jug is filled to the brim with water at 0°. A piece of ice floats in it. The moment the ice melts,

• water level increases

• water level decreases

• water level is unchanged

• water spills out of the jug

The atomic bomb is based on the principle of

• uncontrolled nuclear fusion

• Uncontrolled nuclear fission

• controlled nuclear fission

• controlled nuclear fission