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

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Question # 1

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 2

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

Question # 3

Due to relative motion of observer and the frame of reference of events, time always:

Question # 4

As the light shines on the metal surface, the electrons are ejected

Question # 5

Which of the following is not an example of intertial frame

Question # 6

the symbol to be used in relativity problems denotes:

Question # 7

The value of threshold frequency for different metals is

Question # 8

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

Question # 9

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

Question # 10

The Stephen-Boltzmann law for the black body radiation is given by

Question # 11

From the theory of relativity, momentum p of the photon is related to energy as

Question # 12

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

Question # 13

The positron was discovered by:

Question # 14

According to the special theory of relativity, time is

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 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
2 If a material object moves with the speed of light 'C' its mass becomes
A. Equal to its rest mass
B. Four times of its rest mass
C. Double of its rest mass
D. Infinite
3 According to the special theory of relativity
A. mass and energy are same entities
B. mass and energy are same entities but interconverible
C. mass and energy are different entities but interconverible
D. mass and energy are different entities but non-interconveritble
4 Momentum is a parameter associated with
A. wave motion
B. particle motion
C. neither wave nor particle motion
D. none of these
5 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
6 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)
7 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
8 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
9 When a platinum wire is heated, it appears dull red at about
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
10 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them

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