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

Question # 2

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

Question # 3

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 4

de-Broglies hypthesis was experimentally verified by

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

In photoelectric effect the energy of ejected electrons depend on

Question # 10

Newton's law of motion do not hold in

Question # 11

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

Question # 12

Pair production is the phenomenon in which

Question # 13

An inertial frame is that frame in which

Question # 14

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

Question # 15

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
2 The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:
A. Wien's constant
B. Stefen's constnat
C. Planck's constant
D. Boltzmann's constant
3 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
4 The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
A. classical mechanics
B. Newtonian mechanics
C. quantum mechanics
D. statistical mechanics
5 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
6 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
7 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
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 energy of a photon is represented by
A. h/c2
B. h/T
C. hc2
D. hf/c2
10 If a body reaches a speed equal to the speed of light, then its mass will became
A. zero
B. very small
C. infinity
D. none of these

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