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

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 # 2

Graph of Black body radiation is example of

Question # 3

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

Question # 4

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

Question # 5

Photons must have energy equal to

Question # 6

The shell closer to the nucleus is called:

Question # 7

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

Question # 8

The life time of metastable state is equal to

Question # 9

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

Question # 10

X-ray are also known as

Question # 11

Tick the series which lies in the visible region:

Question # 12

Coulomb multiplied by volt by volt gives the unit called:

Question # 13

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

Question # 14

The process of formation of spectrum is called:

Question # 15

Static electricity is produced by the transfer of:

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:
A. Ultra red region
B. Visible region
C. Ultraviolet region
D. Any of these
2 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
3 CT scanning is the abbreviated name of
A. Computed Technology
B. Computed Technique
C. Computed Technology
D. Computerized Technique
4 The first shell near the neucles is
A. L-shell
B. X-shell
C. N-shell
D. M-shell
5 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
6 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
7 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
8 An electron of the hydrogen atom in the second orbit is called its:
A. Ground state
B. Excited state
C. Ionized state
D. Any of these
9 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
10 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

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