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

00:00
Question # 1

A metastable stae:

Question # 2

The spectrum emitted from hydrogen filled discharge tube is:

Question # 3

The shell closer to the nucleus is called:

Question # 4

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

Question # 5

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

Question # 6

Selenium is:

Question # 7

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

Question # 8

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

Question # 9

Photons must have energy equal to

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

The photocopying process is called:

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
2 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays
3 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
4 Lyman series in the spectrum of hydrogen exists in the :
A. Infra-red region
B. Visible region
C. Ultraviolet region
D. Both(A) and (B)
5 In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:
A. Short wavelength
B. Large wavelength
C. Very large wavelenth
D. Low frequency
6 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
A. Frequency
B. Penetrating power
C. Energy
D. Method of creation
7 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
8 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
9 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
10 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true

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