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

00:00
Question # 1

The process of formation of spectrum is called:

Question # 2

Consider a photon of continuous X-ray and a photon of characteristics X-ray of same wavelength. Which of the following is/are different for the two photons

Question # 3

Ultraviolet region lies in ______ series

Question # 4

A metastable stae:

Question # 5

The natural arrangement of colours in the spectrum of white light spectrum is

Question # 6

Coulomb multiplied by volt by volt gives the unit called:

Question # 7

The He-Ne laser discharge tube is filled with:

Question # 8

The photocopying process is called:

Question # 9

Tick the series which lie/s in. the infra-red region.

Question # 10

The first series which was identified in the spectrum of hydrogen is called:

Question # 11

Laser is a beam of:

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

The range of wavelengths of colurs in the visible colours is

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The inkjet printer eject a thin stream of:
A. Water
B. Oil
C. Ink
D. Any above
2 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
A. Less than atmospheric pressure
B. Much less than atmospheric pressure
C. Greater than atmospheric pressure
D. Much greater than atmospheric pressure
3 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
4 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
5 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
6 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
7 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
8 In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them
A. Small
B. Greater
C. Equal
D. Sometimes
9 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
10 X-rays produced in a tube operating at 105V. The speed of X-rays produced is
A. 3 x 108m/s
B. 3.1 x 108m/s
C. 2.8 x 108m/s
D. 1.88 x 108m/s

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