ECAT Pre Computer Science Chapter 20 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 20 Atomic Spectra

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ECAT Physics Chapter 20 Atomic Spectra

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Question # 1

X-rays produced in a tube operating at 105V. The speed of X-rays produced is

Question # 2

In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:

Question # 3

In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them

Question # 4

The spectrum emitted from hydrogen filled discharge tube is:

Question # 5

Spectrum represents the number of component colours present in certain light in terms of:

Question # 6

The electric field lines start from:

Question # 7

An electron of the hydrogen atom in the second orbit is called its:

Question # 8

We can excite an atom by

Question # 9

CT scanning is the abbreviated name of

Question # 10

A metastable stae:

Question # 11

Energy required by an electron revolving in certain orbit to jump to an excited state is called:

Question # 12

X-rays can penetrate in a solid matte through a distance of several:

Question # 13

Balmer series was identified in:

Question # 14

The inkjet printer eject a thin stream of:

Question # 15

The first shell near the neucles is

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Braking radiation causes:
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm
2 The holes created in the L and M shells are occupied by transitions of:
A. Electrons from lower states
B. Electrons from higher state
C. Positrons from higher states
D. Electrons from K shell
3 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
4 The shell closer to the nucleus is called:
A. N shell
B.
L shell
C. K shell
D. M shell
5 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays
6 In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is
A. Helium
B. Neon
C. Both
D. None of these
7 A metastable stae:
A. Is an excited state
B. Is that in which excited electron is stable
C. Is that in which excited electron is usually unstable
D. Means a time interval of 10-8second
8 The lasing or active medium in He-Ne laser discharge tube is:
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
9 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
10 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape

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