ECAT Pre Engineering Physics Chapter 20 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 20 Atomic Spectra

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 20 Atomic Spectra

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Physics ECAT Pre Engineering Chapter 20 Atomic Spectra

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Question # 1

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

Question # 2

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

Question # 3

We can excite an atom by

Question # 4

Balmer series was identified in:

Question # 5

The electric field lines start from:

Question # 6

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 # 7

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

Question # 8

The first shell near the neucles is

Question # 9

Photons must have energy equal to

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

The range of wavelengths of colurs in the visible colours is

Question # 14

The photocopying process is called:

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays
3 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
4 Braking radiation causes:
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm
5 Static electricity is produced by the transfer of:
A. Electrons
B. Protons
C. One fluid
D. Two fluid
6 CT scanning is the abbreviated name of
A. Computed Technology
B. Computed Technique
C. Computed Technology
D. Computerized Technique
7 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
8 Laser is a beam of:
A. Visible light
B. Infra red light
C. Ultra violet light
D. Violet light only
9 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
A. Less than atmospheric pressure
B. Much less than atmospheric pressure
C. Greater than atmospheric pressure
D. Much greater than atmospheric pressure
10 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

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