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

00:00
Question # 1

Lyman series in the spectrum of hydrogen exists in the :

Question # 2

Coulomb multiplied by volt by volt gives the unit called:

Question # 3

The range of wavelengths of colurs in the visible colours is

Question # 4

The He-Ne laser discharge tube is filled with:

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

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

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

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

Question # 11

Photons must have energy equal to

Question # 12

Static electricity is produced by the transfer of:

Question # 13

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

Question # 14

Braking radiation causes:

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 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)
4 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
5 The first shell near the neucles is
A. L-shell
B. X-shell
C. N-shell
D. M-shell
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 CT scanning is the abbreviated name of
A. Computed Technology
B. Computed Technique
C. Computed Technology
D. Computerized Technique
8 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
9 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All
10 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor

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  • Salmankhan

    Salmankhan

    01 Feb 2018

    Some mcqs having wrong answers.

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