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

00:00
Question # 1

The idea of quantization of energy was proposed by:

Question # 2

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Question # 3

The energy of the 4th orbit in hydrogen atom is

Question # 4

According to the special theory of relativity, a moving clock

Question # 5

The concept of direction and position are purely

Question # 6

Photocell is a device which converts

Question # 7

The Einstein's changes in length, mass and time are not observed in common life because

Question # 8

The value of threshold frequency for different metals is

Question # 9

The special theory of relatively treats the problems involving:

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 14

Newton's law of motion do not hold in

Question # 15

When platinum wire is heated, it appears cherry red at

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Max Planck received the Nobel Prize for his discovery of energy quants in:
A. 1718 AD
B. 1918 AH
C. 1818 AD
D. 1918 AD
2 According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the
A. number of photoelectrons
B. size of the photoelectrons
C. charge on photoelectrons
D. K.E of photoelectrons
3 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero
4 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
5 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
6 The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes
A. 2 mo
B. 1.67 mo
C. 0.67 mo
D. 2.67 mo
7 G.P. Thomson observer experimentally that electrons and neutrons possess
A. particle-like properties
B. wave-like properties
C. neither particle nor wave like properties
D. none of these
8 Newton's law of motion do not hold in
A. an accelerated frame of reference
B. an unaccelerated frame of reference
C. both of these
D. none of these
9 Strictly speaking, the earth is:
A. An accelerated frame of reference
B. A non-inertial frame of reference
C. An inertial frame of reference
D. A non-accelerated frame of reference
10 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume

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    hasnain

    30 May 2018

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