ECAT Pre Engineering Physics Chapter 19 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Question # 1

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

Question # 2

Absolute motion cannot be detected

Question # 3

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

Question # 4

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 5

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Question # 6

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 7

Electromagnetic radiation or photons interact with matter in

Question # 8

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Question # 9

The nature of radiations emitted by a hot body depends upon its:

Question # 10

When a position comes close to an electron they annihilate into

Question # 11

In photoelectric effect the energy of ejected electrons depend on

Question # 12

Intensity of light determines the:

Question # 13

Strictly speaking, the earth is:

Question # 14

Wien's constant is measured in:

Question # 15

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
2 According to the special theory of relativity, a moving clock
A. runs faster
B. runs slower
C. neither runs faster nor slower
D. all of these
3 The special theory of relativity treats problems invoving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
4 From the theory of relativity, momentum p of the photon is related to energy as
A. p = hfc
B. p = hf/c
C. p = f(hc,f)
D. p = cf/h
5 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
6 According to the special theory of relativity
A. mass and energy are same entities
B. mass and energy are same entities but interconverible
C. mass and energy are different entities but interconverible
D. mass and energy are different entities but non-interconveritble
7 The value of threshold frequency for different metals is
A. different
B. same
C. may be different or may be same
D. none of these
8 According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the
A. number of photoelectrons
B. size of the photoelectrons
C. charge on photoelectrons
D. K.E of photoelectrons
9 The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum
A. 2.9 s
B. 3.0 s
C. 6.6 s
D. 9.6 s
10 Pair production is the phenomenon in which
A. matter is converted into energy
B. energy is converted into matter
C. light is converted into electrical energy
D. electrical energy is converted into light

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