ECAT Pre Engineering Physics Chapter 19 MCQ Test With Answer

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 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 # 2

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Question # 3

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

Question # 4

Pair production is the phenomenon in which

Question # 5

A black body is

Question # 6

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

Question # 7

A photon is considered to have

Question # 8

The energy of the 4th orbit in hydrogen atom is

Question # 9

According to the special theory of relativity, time is

Question # 10

The special theory of relativity treats problems invoving

Question # 11

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 12

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

Question # 13

Wien's constant is measured in:

Question # 14

In photoelectric effect the energy of ejected electrons depend on

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
2 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
3 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion
4 G.P. Thomson observer experimentally that electrons and neutrons possess
A. particle-like properties
B. wave-like properties
C. neither particle nor wave like properties
D. none of these
5 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
6 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer
7 The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is
A. 100 J
B. 1.6 x 10-17J
C. 100 eV
D. 1.6 x 10-17eV
8 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
9 The special theory of relatively treats the problems involving:
A. Inertial frames of reference
B. Non-inertial frames
C. Non-accelerated frame
D. Botha (A) and (C)
10 An intertial frame of reference is a frame of reference which is
A. at rest
B. moving with uniform velocity
C. either at rest or moving with uniform velocity
D. none of these

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