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

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

Question # 2

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

Question # 3

The idea of quantization of energy was proposed by:

Question # 4

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

Question # 5

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Question # 6

the symbol to be used in relativity problems denotes:

Question # 7

Position was discovered by Carl Anderson in

Question # 8

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

Question # 9

The inside cavity of the black body is

Question # 10

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

Question # 11

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

Question # 12

When a platinum wire is heated, it appears orange red at

Question # 13

Compton shift refers to:

Question # 14

The energy of a photon is represented by

Question # 15

Photocell is a device which converts

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as
A. ON switch
B. off switch
C. function switch
D. none of these
2 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
3 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
4 The energy of the 4th orbit in hydrogen atom is
A. 2.5 ev
B. - 3.5 ev
C. -0.85 ev
D. -13.6 ev
5 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
A. photoelectric effect
B. pair production
C. Compton effect
D. uncertainty principle
6 An intertial frame of reference is a frame of reference which is
A. at rest
B. moving with uniform velocity
C. either at rest or moving with uniform velocity
D. none of these
7 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
8 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass
9 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
10 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v

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