ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

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

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

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ECAT Physics Chapter 19 Dawn of Modern Physics

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Question # 1

The photoelectric effect, the maximum energy of photoelectrons depends on the

Question # 2

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Question # 3

Photoelectric effect takes place with a photon of:

Question # 4

According to the Max plank, energy is redialed or absorbed in

Question # 5

Which of the following phenomenon proves the particle nature of light

Question # 6

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Question # 7

A non-inertial frame of reference is one, in which

Question # 8

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 9

As the light shines on the metal surface, the electrons are ejected

Question # 10

In photoelectric effect the energy of ejected electrons depend on

Question # 11

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 12

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 13

Photocell is a device which converts

Question # 14

The general theory of relativity treats problems involving

Question # 15

According to the special theory of relativity, a moving clock

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The Einstein's changes in length, mass and time are not observed in common life because
A. We dont observer then seriously
B. The masses are too large
C. Their speed is too small than the speed of right
D. All of the above
2 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
3 An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
A. 1.66 x 10-29m
B. 1.74 x 10-10cm
C. 17.4 x 10-6m
D. 1.74 x 10-10m
4 A high temperature, the proportion of shorter wavelengths radiation, emitted by the body
A. decreases
B. first increases then decreases
C. increases
D. any one of them
5 The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:
A. Lummer
B. Planck
C. Pringsheim
D. Both (A ) and (B)
6 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
7 When low energy photon interact with a metal,which of the following effect is likely to be taken place
A. pair production
B. photoelectric
C. Compton effect
D. None of these
8 The special theory of relatively treats the problems involving:
A. Inertial frames of reference
B. Non-inertial frames
C. Non-accelerated frame
D. Botha (A) and (C)
9 When a platinum wire is heated, it appears orange red at
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
10 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero

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