1st Year Physics Chapter 13 Test13. Relativity

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

1. The first postulate of special relativity states that the laws of physics are same in:
   1. All accelerating frames
   2. All inertial frames
   3. All rotating frames
   4. All gravitational fields
2. A frame of reference that is at rest or moving with uniform velocity is called a:
   1. stationary frame
   2. inertial frame
   3. non-inertial frame
   4. rotational frame
3. Minkowski space combines:
   1. Time with three spatial dimensions
   2. Time with mass
   3. Time with energy
   4. Length with velocity
4. Value of speed of light (c) is approximately:
   1. 3×10² m/s
   2. 3×10⁵ m/s
   3. 3×10⁸ m/s
   4. 3×10¹⁰ m/s
5. An inertial frame of reference is the one.
   1. Which is at rest.
   2. Which is moving with a uniform velocity along a straight line.
   3. Which has zero acceleration.
   4. All of these
6. Length of a moving object becomes:
   1. Larger
   2. Shorter
   3. Stays the same
   4. Infinite
7. The spacetime model is:
   1. A physical machine
   2. A mathematical model
   3. An experimental device
   4. A real four-dimensional object
8. Which equation expresses mass-energy equivalence?
   1. F = ma
   2. p = mv
   3. E = mc²
   4. W = Fd
9. A frame of reference that is accelerating is called:
   1. inertial frame
   2. non-inertial frame
   3. gravitational frame
   4. absolute frame
10. Explain what is meant by a frame of reference.
    1. A frame of reference is a graph plotted between distance and time.
    2. A frame of reference is a graph plotted between speed and time.
    3. A frame of reference is the velocity of an object through empty space without regard to its surroundings.
    4. A frame of reference is an arbitrarily fixed point with respect to which motion of other points is measured.