ECAT Pre Engineering Physics Chapter 19 MCQ Test With Answer

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

Try The 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

According to the special theory of relativity, a moving clock

Question # 2

Practically the quantity v/c is always:

Question # 3

The special theory of relatively treats the problems involving:

Question # 4

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

Question # 5

The mass of an object will be doubled at speed

Question # 6

Pair production is the phenomenon in which

Question # 7

The special theory of relativity treats problems invoving

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

Converse of pair production is known as

Question # 14

Strictly speaking, the earth is:

Question # 15

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
3 When a platinum wire is heated, it appears dull red at about
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
4 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above
5 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
6 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
7 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
8 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
9 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
10 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion

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