ECAT Pre Computer Science Chapter 20 MCQ Test With Answer

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 first shell near the neucles is

Question # 2

Lyman series in the spectrum of hydrogen exists in the :

Question # 3

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

Question # 4

Static electricity is produced by the transfer of:

Question # 5

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

Question # 6

X-ray are also known as

Question # 7

Balmer series was identified in:

Question # 8

Selenium is:

Question # 9

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

Question # 10

Tick the series which lies in the visible region:

Question # 11

A metastable stae:

Question # 12

Coulomb multiplied by volt by volt gives the unit called:

Question # 13

The spectrum emitted from hydrogen filled discharge tube is:

Question # 14

Braking radiation causes:

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
2 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
3 X-rays can penetrate in a solid matte through a distance of several:
A. Kilo metres
B. Metres
C. Centimeters
D. A few angstroms
4 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
5 An compared to solid matter, a crack or an air bubble allows:
A. Great amount of X-rays to pass
B. Smallast amount of X-rays to pass
C. Very samall amount of X-rays to pass
D. Any of these
6 Laser is a beam of:
A. Visible light
B. Infra red light
C. Ultra violet light
D. Violet light only
7 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
8 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)
9 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true
10 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these

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