ECAT Pre General Science Physics Chapter 20 MCQ Test With Answer

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

Photons must have energy equal to

Question # 2

We can excite an atom by

Question # 3

The value of the metastable state for Neon is

Question # 4

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

Question # 5

The spectrum emitted from hydrogen filled discharge tube is:

Question # 6

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

Question # 7

The process of formation of spectrum is called:

Question # 8

The first shell near the neucles is

Question # 9

Tick the series which lies in the visible region:

Question # 10

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

Question # 11

CT scanning is the abbreviated name of

Question # 12

The inkjet printer eject a thin stream of:

Question # 13

Selenium is:

Question # 14

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

Question # 15

The range of wavelengths of colurs in the visible colours is

Question # 16

Laser is a beam of:

Question # 17

Graph of Black body radiation is example of

Question # 18

Coulomb multiplied by volt by volt gives the unit called:

Question # 19

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

Question # 20

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

Question # 21

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

Question # 22

Gaussian surface is always:

Question # 23

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

Question # 24

The He-Ne laser discharge tube is filled with:

Question # 25

The photocopying process is called:

Question # 26

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 # 27

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

Question # 28

Braking radiation causes:

Question # 29

Lyman series in the spectrum of hydrogen exists in the :

Question # 30

The electric field lines start from:

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
2 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)
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 The shell closer to the nucleus is called:
A. N shell
B.
L shell
C. K shell
D. M shell
5 The photocopying process is called:
A. Geography
B. Sonography
C. Xerography
D. Zerography
6 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
7 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
8 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
9 The first series which was identified in the spectrum of hydrogen is called:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
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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