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

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

Question # 2

Tick the series which lies in the visible region:

Question # 3

Photons must have energy equal to

Question # 4

We can excite an atom by

Question # 5

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

Question # 6

Balmer series was identified in:

Question # 7

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

Question # 8

Braking radiation causes:

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

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

Question # 11

The shell closer to the nucleus is called:

Question # 12

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 # 13

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

Question # 14

Ultraviolet region lies in ______ series

Question # 15

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

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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 Tick the series which lie/s in. the infra-red region.
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
3 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
4 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
5 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
6 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
7 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
8 The photocopying process is called:
A. Geography
B. Sonography
C. Xerography
D. Zerography
9 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All
10 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron

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