ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

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

Try The 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

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

Question # 2

A particle having mass and charge equal to that of an electron is called:

Question # 3

The concept of direction and position are purely

Question # 4

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

Question # 5

The idea of quantization of energy was proposed by:

Question # 6

The general theory of relativity treats problems involving

Question # 7

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

Question # 8

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

Question # 9

The Einstein's changes in length, mass and time are not observed in common life because

Question # 10

The special theory of relativity is based on:

Question # 11

Absolute motion cannot be detected

Question # 12

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:

Question # 13

Max Planck received the Nobel Prize for his discovery of energy quants in:

Question # 14

Compton was awarded Nobel prize in physics in

Question # 15

The photoelectric effect, the maximum energy of photoelectrons depends on the

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 0.1 kg mass will be equivalent to the energy
A. 9 x 1015J
B. 5 x 108J
C. 6 x 1016J
D. 9 x 10-16J
3 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
A. 1.66 m
B. 1.0 m
C. 0.66 m
D. 2.66 m
4 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
5 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
6 Electromagnetic radiation or photons interact with matter in
A. two distinct ways
B. three distinct ways
C. four distinct ways
D. five distinct ways
7 When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called
A. thermoionic electrons
B. free electrons
C. photoelectrons
D. slow electrons
8 If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:
A. Newton
B. Joule
C. Joule-Sec
D. Joule-s-1
9 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
10 According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the
A. number of photoelectrons
B. size of the photoelectrons
C. charge on photoelectrons
D. K.E of photoelectrons

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