ECAT Pre General Science Physics Chapter 19 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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Question # 1

G.P. Thomson observer experimentally that electrons and neutrons possess

Question # 2

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Question # 3

Photocell is a device which converts

Question # 4

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

Question # 5

The energy of a photon is represented by

Question # 6

Pair production is the phenomenon in which

Question # 7

The existence of position was predicted by Dirace in

Question # 8

When a platinum wire is heated, it appears dull red at about

Question # 9

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

Question # 10

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

Question # 11

At the temperature, a body emits radiation which is principally

Question # 12

The length contraction happens only

Question # 13

Which of the following is not an example of intertial frame

Question # 14

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

Question # 15

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

Question # 16

de-Broglies hypthesis was experimentally verified by

Question # 17

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

Question # 18

0.1 kg mass will be equivalent to the energy

Question # 19

Which one of the following physical quantities changes with relativistic speed

Question # 20

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Question # 21

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Question # 22

Electromagnetic radiation or photons interact with matter in

Question # 23

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

Question # 24

Wien's constant is measured in:

Question # 25

Which of the following phenomenon proves the particle nature of light

Question # 26

Victor de-Brogile received the Nobel prize in physics in

Question # 27

Strictly speaking, the earth is:

Question # 28

When a position comes close to an electron they annihilate into

Question # 29

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

Question # 30

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

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Sr.# Question Answer
1 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
2 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
3 According to the Max plank, energy is redialed or absorbed in
A. discrete packets
B. continuous waves
C. either of them
D. none of these
4 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
5 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
6 A non-inertial frame of reference is one, in which
A. law of inertial is valid
B. all laws of physics are the same in all frames
C. a>0 or a<0
D. a=0
7 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
8 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)
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 Due to relative motion of observer and the frame of reference of events, time always:
A. Dilates itself
B. Contracts itself
C. Stretches itself
D. Both (A) and (C)
11 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
12 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
13 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935
14 Davision and Germer performed experiment to verify
A. de-Brogile hypothesis
B. theory of relativity
C. Newton's law of gravitation
D. Mass-energy relation
15 At the temperature, a body emits radiation which is principally
A. of long wavelengths in the visible region
B. of long wavelengths in the invisible infrared region
C. of short wavelength in invisible ultraviolet region
D. none of these
16 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
17 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
18 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
19 According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body
A. Remains constant
B. Decreases
C. Increases to infinity
D. Reduced to zero
20 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
21 The special theory of relativity treats problems invoving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
22 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
23 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
24 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
25 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)
26 Which of the following phenomenon proves the particle nature of light
A. interference
B. diffraction
C. photoelectric effect
D. none of these
27 Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
A. Energy only
B. Momentum only
C. Mass only
D. Charge only
28 The energy of a photon is represented by
A. h/c2
B. h/T
C. hc2
D. hf/c2
29 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
30 The general theory of relativity treats problems involving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these

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