ECAT Pre General Science Physics Chapter 20 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 20 Atomic Spectra

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 20 Atomic Spectra

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ECAT Pre General Science Physics Chapter 20 Atomic Spectra

00:00
Question # 1

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

Question # 2

Coulomb multiplied by volt by volt gives the unit called:

Question # 3

The spectrum emitted from hydrogen filled discharge tube is:

Question # 4

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 # 5

Ultraviolet region lies in ______ series

Question # 6

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

Question # 7

Gaussian surface is always:

Question # 8

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

Question # 9

A metastable stae:

Question # 10

Graph of Black body radiation is example of

Question # 11

If the distance between two charges is doubled,the force between them will become:

Question # 12

The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is

Question # 13

The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:

Question # 14

The process of formation of spectrum is called:

Question # 15

Balmer series was identified in:

Question # 16

Lyman series in the spectrum of hydrogen exists in the :

Question # 17

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

Question # 18

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

Question # 19

The photocopying process is called:

Question # 20

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

Question # 21

Tick the series which lies in the visible region:

Question # 22

The lasing or active medium in He-Ne laser discharge tube is:

Question # 23

Braking radiation causes:

Question # 24

The results of spectra obtained by Balmer were expressed in 1896 by:

Question # 25

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 # 26

The first shell near the neucles is

Question # 27

The life time of metastable state is equal to

Question # 28

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

Question # 29

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

Question # 30

The inkjet printer eject a thin stream of:

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The spectrum emitted from hydrogen filled discharge tube is:
A. Line spectrum
B. Discrete spectrum
C. And spectrum
D. Absorption spectrum
2 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
3 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
4 Braking radiation causes:
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm
5 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays
6 The inkjet printer eject a thin stream of:
A. Water
B. Oil
C. Ink
D. Any above
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 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
9 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
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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