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 nature of radiations emitted by a hot body depends upon its:

Question # 2

Newton's law of motion do not hold in

Question # 3

Pair production is the phenomenon in which

Question # 4

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

Question # 5

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Question # 6

Which of the following phenomenon proves the particle nature of light

Question # 7

When a platinum wire is heated, it appears yellow at

Question # 8

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

Question # 9

G.P. Thomson observer experimentally that electrons and neutrons possess

Question # 10

The mass of an object will be doubled at speed

Question # 11

The positron was discovered by:

Question # 12

The energy of the 4th orbit in hydrogen atom is

Question # 13

Converse of pair production is known as

Question # 14

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

Question # 15

Which of the following is not an example of intertial frame

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be
A. 2.120°A
B. 0.212°A
C. 21.2°A
D. 0.14°
a
3 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
4 The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of
A. 2 cm/s
B. 20 cm/s
C. 200 cm/s
D. 2000 cm/s
5 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
6 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
7 The mass of an object will be doubled at speed
A. 1.6 x 108ms-1
B. 2.6 X 108ms-1
C. 2.6 x 107ms-1
D. 2.6 x 109ms-1
8 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
9 According to the Max plank, energy is redialed or absorbed in
A. discrete packets
B. continuous waves
C. either of them
D. none of these
10 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron

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