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

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Question # 1

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

Question # 2

CT scanning is the abbreviated name of

Question # 3

Ultraviolet region lies in ______ series

Question # 4

The process of formation of spectrum is called:

Question # 5

Tick the series which lies in the visible region:

Question # 6

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

Question # 7

The first shell near the neucles is

Question # 8

Static electricity is produced by the transfer of:

Question # 9

Photons must have energy equal to

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

The photocopying process is called:

Question # 14

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

Question # 15

The range of wavelengths of colurs in the visible colours is

Question # 16

Braking radiation causes:

Question # 17

We can excite an atom by

Question # 18

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

Question # 19

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

Question # 20

Laser is a beam of:

Question # 21

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

Question # 22

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

Question # 23

Lyman series in the spectrum of hydrogen exists in the :

Question # 24

The spectrum emitted from hydrogen filled discharge tube is:

Question # 25

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

Question # 26

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

Question # 27

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

Question # 28

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

Question # 29

The value of the metastable state for Neon is

Question # 30

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All
3 The life time of metastable state is equal to
A. Life time of excited state
B. Greater than by excited state
C. Zero
D. Less than by excited state
4 The lasing or active medium in He-Ne laser discharge tube is:
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
5 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
6 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)
7 The first shell near the neucles is
A. L-shell
B. X-shell
C. N-shell
D. M-shell
8 The inkjet printer eject a thin stream of:
A. Water
B. Oil
C. Ink
D. Any above
9 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays
10 CT scanning is the abbreviated name of
A. Computed Technology
B. Computed Technique
C. Computed Technology
D. Computerized Technique

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