ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

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

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Question # 3

The special theory of relativity is based on:

Question # 4

When low energy photon interact with a metal,which of the following effect is likely to be taken place

Question # 5

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Question # 6

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

Question # 7

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Question # 8

If a body reaches a speed equal to the speed of light, then its mass will became

Question # 9

Compton studied the scattering of x-rays by loosely bound electrons from:

Question # 10

0.1 kg mass will be equivalent to the energy

Question # 11

Victor de-Brogile received the Nobel prize in physics in

Question # 12

The energy of the 4th orbit in hydrogen atom is

Question # 13

The unit of work function is:

Question # 14

When a platinum wire is heated, it appears dull red at about

Question # 15

When a high energy photon interact with a metal, which of the following effect is most likely to be taken place

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 With the help of 50 K v electron microscope, a resolution of
A. 0.5 to 1 m to possible
B. 1 m to 10 m is possible
C. 0.5 to 1 nm is possible
D. 1 to 10 nm is possible
3 A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is
A. 1.66 m
B. 1.66 x 10-10m
C. 1.66 x 10-29cm
D. 1.66 x 10-29m
4 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
5 Photocell is a device which converts
A. chemical energy into electrical energy
B. electrical energy into light energy
C. heat energy into electrical energy
D. light energy into electrical energy
6 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
7 According to the de-Brogile relation, an object of large mass and ordinary speed has
A. very small wavelength
B. very large wavelength
C. very small frequency
D. all of these
8 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
9 The general theory of relativity treats problems involving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
10 Electromagnetic radiation or photons interact with matter in
A. two distinct ways
B. three distinct ways
C. four distinct ways
D. five distinct ways

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