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 value of the plank's constant 'h' is given by

Question # 2

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

Question # 3

The idea of quantization of energy was proposed by:

Question # 4

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

Question # 5

S.I. unit of planks constant is

Question # 6

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 7

When the atomic particle are moving with velocities approaching that of light:

Question # 8

The special theory of relatively treats the problems involving:

Question # 9

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 10

If a material object moves with the speed of light 'C' its mass becomes

Question # 11

There is no way to detect:

Question # 12

Wien's constant is measured in:

Question # 13

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

Question # 14

Which of the following is not an example of intertial frame

Question # 15

The value of the Stephen's constant for black body radiations is given by

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:
A. Lummer
B. Planck
C. Pringsheim
D. Both (A ) and (B)
3 When the atomic particle are moving with velocities approaching that of light:
A. Newton's laws become valid
B. Relativistic effects become prominent
C. Botha(A) and (B) are valid
D. Neither (A)nor (B)
4 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
5 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
6 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
A. 2.9 s
B. 3.0 s
C. 6.6 s
D. 9.6 s
7 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
8 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
9 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
10 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)

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