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

A particle having mass and charge equal to that of an electron is called:

Question # 2

The energy of a photon is represented by

Question # 3

From the theory of relativity, momentum p of the photon is related to energy as

Question # 4

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

Question # 5

The year when A.H. compton was awarded Nobel Prize is:

Question # 6

S.I. unit of planks constant is

Question # 7

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

Question # 8

In photoelectric effect the energy of ejected electrons depend on

Question # 9

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

Question # 10

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

Question # 11

The photon of radio-waves has energy of about

Question # 12

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

Question # 13

Pair production is the phenomenon in which

Question # 14

According to the special theory of relativity, time is

Question # 15

When a position comes close to an electron they annihilate into photons such that

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v
2 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
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 special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
5 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well
6 The value of the Stephen's constant for black body radiations is given by
A. 5.6 x 108Wm-2K-4
B. 5.67 x 10-8Wm-2K-4
C. 2.9 x 10-3mK
D. 2.9 x 103mK
7 The energy of a photon is represented by
A. h/c2
B. h/T
C. hc2
D. hf/c2
8 0.1 kg mass will be equivalent to the energy
A. 9 x 1015J
B. 5 x 108J
C. 6 x 1016J
D. 9 x 10-16J
9 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
10 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion

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