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

The special theory of relatively treats the problems involving:

Question # 2

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

Question # 3

According to Einstein, with the great increase in the speed of the body the relativistic length of the body

Question # 4

Photoelectrons are emitted when ultraviolet light falls on:

Question # 5

0.1 kg mass will be equivalent to the energy

Question # 6

The value of the plank's constant 'h' is given by

Question # 7

The unit of work function is:

Question # 8

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

Question # 9

There is no way to detect:

Question # 10

The special theory of relativity is based on the

Question # 11

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

Question # 12

The existence of position was predicted by Dirace in

Question # 13

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

Question # 14

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by
A. Max plank
B. Newton
C. Einstein
D. J.J. Thomson
2 The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be
A. 500 m
B. 500 nm
C. 500 km
D. 500 cm
3 If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:
A. Newton
B. Joule
C. Joule-Sec
D. Joule-s-1
4 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
5 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
6 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
7 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
8 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
9 When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called
A. thermoionic electrons
B. free electrons
C. photoelectrons
D. slow electrons
10 There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
A. maximum frequency
B. minimum frequency
C. threshold frequency
D. all of these

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