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 Max plank, energy is redialed or absorbed in

Question # 2

Momentum is a parameter associated with

Question # 3

Photoelectric effect takes place with a photon of:

Question # 4

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

Question # 5

The concept of direction is purely:

Question # 6

The special theory of relativity is based on the

Question # 7

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Question # 8

Davision and Germer performed experiment to verify

Question # 9

As the light shines on the metal surface, the electrons are ejected

Question # 10

When a platinum wire is heated, it appears white at

Question # 11

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

Question # 12

When platinum wire is heated, it appears cherry red at

Question # 13

According to the special theory of relativity

Question # 14

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

Question # 15

If a material object moves with the speed of light 'C' its mass becomes

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 From the theory of relativity, momentum p of the photon is related to energy as
A. p = hfc
B. p = hf/c
C. p = f(hc,f)
D. p = cf/h
2 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)
3 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
4 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
5 If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers
A. larger
B. shorter
C. equal
D. none of these
6 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
7 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
8 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
9 The mass of an object will be doubled at speed
A. 1.6 x 108ms-1
B. 2.6 X 108ms-1
C. 2.6 x 107ms-1
D. 2.6 x 109ms-1
10 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C

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