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 value of threshold frequency for different metals is

Question # 2

The mass of an object will be doubled at speed

Question # 3

Due to relative motion of observer and the frame of reference of events, time always:

Question # 4

At the temperature, a body emits radiation which is principally

Question # 5

Max Planck received the Nobel Prize for his discovery of energy quants in:

Question # 6

With the help of 50 K v electron microscope, a resolution of

Question # 7

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 8

In photoelectric effect the energy of ejected electrons depend on

Question # 9

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Question # 10

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

Question # 11

The energy of photon 'E' is proported to

Question # 12

A photon is considered to have

Question # 13

If a material object moves with the speed of light 'C' its mass becomes

Question # 14

Electromagnetic radiation or photons interact with matter in

Question # 15

The concept of direction and position are purely

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
2 According to the de-Brogile relation, an object of large mass and ordinary speed has
A. very small wavelength
B. very large wavelength
C. very small frequency
D. all of these
3 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)
4 The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is
A. 100 J
B. 1.6 x 10-17J
C. 100 eV
D. 1.6 x 10-17eV
5 In photoelectric effect the energy of ejected electrons depend on
A. The frequency
B. The intensity
C. Both frequency and intensity
D. None of these
6 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
7 Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
A. Energy only
B. Momentum only
C. Mass only
D. Charge only
8 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
9 Which of the following phenomenon proves the particle nature of light
A. interference
B. diffraction
C. photoelectric effect
D. none of these
10 The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
A. classical mechanics
B. Newtonian mechanics
C. quantum mechanics
D. statistical mechanics

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