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

the dilation of time applies to the timing processes which are:

Question # 2

The mass of an object will be doubled at speed

Question # 3

The general theory of relativity treats problems involving

Question # 4

Newton's law of motion do not hold in

Question # 5

The special theory of relativity is based on:

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Question # 10

An inertial frame is that frame in which

Question # 11

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 # 12

de-Broglies hypthesis was experimentally verified by

Question # 13

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

Question # 14

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

Question # 15

The special theory of relatively treats the problems involving:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
3 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
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 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
6 As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:
A. Smaller
B. Lerger
C. Same
D. Much larger
7 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
A. photoelectric effect
B. pair production
C. Compton effect
D. uncertainty principle
8 Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
A. 1890
B. 1895
C. 1900
D. 1905
9 In the compton's effect, it is found that the wavelength of incident x-rays is
A. greater than the wavelength of scattered x-rays
B. equal to the wavelength of scattered x-rays
C. less than the wavelength of scattered x-rays
D. any one of these
10 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

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    hasnain

    30 May 2018

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