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

Question # 2

Balmer series was identified in:

Question # 3

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

Question # 4

Selenium is:

Question # 5

The life time of metastable state is equal to

Question # 6

The inkjet printer eject a thin stream of:

Question # 7

The photocopying process is called:

Question # 8

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

Question # 9

The value of the metastable state for Neon is

Question # 10

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

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

The spectrum emitted from hydrogen filled discharge tube is:

Question # 14

Braking radiation causes:

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Laser is a beam of:
A. Visible light
B. Infra red light
C. Ultra violet light
D. Violet light only
2 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
3 Static electricity is produced by the transfer of:
A. Electrons
B. Protons
C. One fluid
D. Two fluid
4 An compared to solid matter, a crack or an air bubble allows:
A. Great amount of X-rays to pass
B. Smallast amount of X-rays to pass
C. Very samall amount of X-rays to pass
D. Any of these
5 The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:
A.
one
B. two
C. three
D. four
6 The process of formation of spectrum is called:
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
7 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
8 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true
9 Balmer series lies in that region of electromagnetic wave spectrum which is called:
A. Visible region
B. Invisible region
C. Infra-red region
D. ultraviolet region
10 The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is
A. 1.24 x 10-10m
B. 7.92 x 10-20m
C. 2.78 x 10-14m
D. 3.88 x 10-11m

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