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

According to the Max plank, energy is redialed or absorbed in

Question # 2

The special theory of relativity is based on:

Question # 3

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

Question # 4

S.I. unit of planks constant is

Question # 5

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 6

The value of the Stephen's constant for black body radiations is given by

Question # 7

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

Question # 8

There is no way to detect:

Question # 9

The inside cavity of the black body is

Question # 10

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

Question # 11

The photon of radio-waves has energy of about

Question # 12

The special theory of relativity treats problems invoving

Question # 13

0.1 kg mass will be equivalent to the energy

Question # 14

The general theory of relativity treats problems involving

Question # 15

When a position comes close to an electron they annihilate into photons such that

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 Photocell is a device which converts
A. chemical energy into electrical energy
B. electrical energy into light energy
C. heat energy into electrical energy
D. light energy into electrical energy
3 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)
4 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
5 The Einstein's changes in length, mass and time are not observed in common life because
A. We dont observer then seriously
B. The masses are too large
C. Their speed is too small than the speed of right
D. All of the above
6 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
7 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
8 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these
9 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
10 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

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