1st Year Physics Chapter 11 TestSpecial Theory of Relativity

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. A frame of reference that is accelerating w.r.t. an inertial frame is called:

   1. Inertial

   2. Stationary

   3. Non-inertial

   4. Rotational

2. The concept of space-time combines:

   1. Space and gravity

   2. Mass and velocity

   3. Space and time into a four-dimensional continuum

   4. Time and space

3. If an observer is moving in the same direction as a sound wave, the velocity of the wave seems to be:

   1. More

   2. Less

   3. Constant

   4. Sum of the two velocities

4. In relative motion, if object A is stationary and object B is moving, the velocity of B relative to A is:

   1. Equal to velocity of B

   2. Zero

   3. Equal to velocity of A

   4. Negative of velocity of A

5. The special theory of relativity is applicable to the object moving with maximum velocity equal to:

   1. Speed of light

   2. More than speed of light

   3. Less than speed of light

   4. Double the speed of light

6. Relative motion is defined as the motion of one object:

   1. W.r.t the ground

   2. W.r.t time

   3. W.r.t one another

   4. W.r.t itself

7. Which of the following is a non-inertial frame of reference?

   1. A train moving at constant speed on a straight track

   2. A stationary table

   3. A car accelerating forward

   4. A spaceship drifting in deep space with no forces acting

8. At what speed would the mass of an electron become double of its rest mass?

   1. 0.5 c

   2. 0.707 c

   3. 0.866 c

   4. 0.99 c

9. If the rest mass of a particle m_o increases to m due to its high speed, then its kinetic energy is:

   1. 1/2 mc²

   2. 1/2 mv²

   3. (m - m_o) c²

   4. 1/2 (m - m_o) c²

10. The speed of light (3x10^-4 ms^-2) in free space is:

    1. Variable

    2. Less than that in air

    3. Unpredictable

    4. Constant