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

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

Question # 2

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

Question # 3

The life time of metastable state is equal to

Question # 4

The electric field lines start from:

Question # 5

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

Question # 6

The photocopying process is called:

Question # 7

Braking radiation causes:

Question # 8

Balmer series was identified in:

Question # 9

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

Question # 10

Coulomb multiplied by volt by volt gives the unit called:

Question # 11

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

Question # 12

Selenium is:

Question # 13

The inkjet printer eject a thin stream of:

Question # 14

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

Question # 15

Laser is a beam of:

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
2 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
3 The natural arrangement of colours in the spectrum of white light spectrum is
A. VIBGYOR
B. ROYBGIV
C. ROYBIGV
D. BIGROYV
4 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
5 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true
6 The holes created in the L and M shells are occupied by transitions of:
A. Electrons from lower states
B. Electrons from higher state
C. Positrons from higher states
D. Electrons from K shell
7 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
8 By CAT scans, we can detect the density difference of the order of:
A. 1%
B. 20%
C. 30%
D. 50%
9 The lasing or active medium in He-Ne laser discharge tube is:
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
10 In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them
A. Small
B. Greater
C. Equal
D. Sometimes

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