ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

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

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

Question # 2

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

Question # 3

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

Question # 4

The length contraction happens only

Question # 5

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

Question # 6

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 7

Victor de-Brogile received the Nobel prize in physics in

Question # 8

When a platinum wire is heated, it appears yellow at

Question # 9

The concept of direction is purely:

Question # 10

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Question # 11

According to the special theory of relativity

Question # 12

With the help of 50 K v electron microscope, a resolution of

Question # 13

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 14

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

Question # 15

The year when A.H. compton was awarded Nobel Prize is:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
2 If a body reaches a speed equal to the speed of light, then its mass will became
A. zero
B. very small
C. infinity
D. none of these
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 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
5 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
6 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
7 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v
8 The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:
A. Wien's constant
B. Stefen's constnat
C. Planck's constant
D. Boltzmann's constant
9 In photoelectric effect the energy of ejected electrons depend on
A. The frequency
B. The intensity
C. Both frequency and intensity
D. None of these
10 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these

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