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

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

Question # 2

Selenium is:

Question # 3

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 # 4

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

Question # 5

The results of spectra obtained by Blamer were expressed in 1896 by

Question # 6

An compared to solid matter, a crack or an air bubble allows:

Question # 7

The life time of metastable state is equal to

Question # 8

Ultraviolet region lies in ______ series

Question # 9

The spectrum emitted from hydrogen filled discharge tube is:

Question # 10

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

Question # 11

Tick the series which lies in the visible region:

Question # 12

The electric field lines start from:

Question # 13

Coulomb multiplied by volt by volt gives the unit called:

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
2 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
3 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
4 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
5 Spectrum represents the number of component colours present in certain light in terms of:
A. Wavelength
B. Frequency
C. Energy
D. Both (A) and (B)
6 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
7 The photocopying process is called:
A. Geography
B. Sonography
C. Xerography
D. Zerography
8 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
9 The first shell near the neucles is
A. L-shell
B. X-shell
C. N-shell
D. M-shell
10 The inkjet printer eject a thin stream of:
A. Water
B. Oil
C. Ink
D. Any above

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