ECAT Pre Computer Science Chapter 20 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 20 Atomic Spectra

Try The 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

Balmer series lies in that region of electromagnetic wave spectrum which is called:

Question # 2

The range of wavelengths of colurs in the visible colours is

Question # 3

Braking radiation causes:

Question # 4

Lyman series in the spectrum of hydrogen exists in the :

Question # 5

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

Question # 6

The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:

Question # 7

Coulomb multiplied by volt by volt gives the unit called:

Question # 8

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

Question # 9

Atoms of hydrogen gas can be excited by passing electric current through it when the gas is filled into the discharge tube at a pressure which is

Question # 10

By CAT scans, we can detect the density difference of the order of:

Question # 11

The holes created in the L and M shells are occupied by transitions of:

Question # 12

The electric field lines start from:

Question # 13

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

Question # 14

In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is

Question # 15

The photocopying process is called:

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ECAT Class Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays
2 The life time of metastable state is equal to
A. Life time of excited state
B. Greater than by excited state
C. Zero
D. Less than by excited state
3 The natural arrangement of colours in the spectrum of white light spectrum is
A. VIBGYOR
B. ROYBGIV
C. ROYBIGV
D. BIGROYV
4 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
5 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
6 Laser is a beam of:
A. Visible light
B. Infra red light
C. Ultra violet light
D. Violet light only
7 Lyman series in the spectrum of hydrogen exists in the :
A. Infra-red region
B. Visible region
C. Ultraviolet region
D. Both(A) and (B)
8 Ultraviolet region lies in ______ series
A. Layman
B. Balmer
C. P fund
D. B racket
9 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All
10 In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:
A. Short wavelength
B. Large wavelength
C. Very large wavelenth
D. Low frequency

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