Physics Quiz

An experiment that led to the theory of relativity was performed by

• Einstein

• Michelson & Morley

• Rutherford

• Lorentz

The rest mass of a particle is defined as

• mass when absolutely at rest

• mass when moving with speed of light

• mass of the particle moving at a speed very small compared with the speed of light

• mass of the particle moving at a speed which is half the speed of light

Einstein's mass - energy relation shows that

• mass disappears to reappear as energy

• energy disappears to reappear as mass

• mass and energy are two different forms of the same entity

• all the above statements are correct

A source of light moves with a velocity c/2 towards the observer, then speed of light is

• 3c/2

• c/2

• c

• 2c

The special theory of relativity shows that Newtonian mechanics is valid at

• all velocities

• velocity nearer to that of light

• velocities much smaller that light velocity

• zero velocity

which of the following is invariant under Galilean transformations?

• Velocity

• Acceleration

• Speed

• None of the above

which of the following is not invariant under Galilean transformations?

• Space interval

• Time interval

• Mass

• Momentum

At what speed the mass of a body will be almost doubled?

• 0.97c

• 0.87c

• 0.77c

• none of the other

According to the special theory of relativity, which of the following has same value in all inertial frames?

• mass of an object

• length of an object

• velocity of sound

• velocity of light

A rod of length one metre is moving with a velocity of 0.8c. What is the contraction in its length as measured by an observer at rest?

• 0.04cm

• 0.4cm

• 4cm

• 60 cm