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

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

Question # 2

Lyman series in the spectrum of hydrogen exists in the :

Question # 3

Ultraviolet region lies in ______ series

Question # 4

The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is

Question # 5

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 # 6

A metastable stae:

Question # 7

Static electricity is produced by the transfer of:

Question # 8

Coulomb multiplied by volt by volt gives the unit called:

Question # 9

The inkjet printer eject a thin stream of:

Question # 10

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

Question # 11

The first shell near the neucles is

Question # 12

Laser is a beam of:

Question # 13

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

Question # 14

An electron of the hydrogen atom in the second orbit is called its:

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 CT scanning is the abbreviated name of
A. Computed Technology
B. Computed Technique
C. Computed Technology
D. Computerized Technique
2 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)
3 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
4 X-rays produced in a tube operating at 105V. The speed of X-rays produced is
A. 3 x 108m/s
B. 3.1 x 108m/s
C. 2.8 x 108m/s
D. 1.88 x 108m/s
5 In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is
A. Helium
B. Neon
C. Both
D. None of these
6 The first shell near the neucles is
A. L-shell
B. X-shell
C. N-shell
D. M-shell
7 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
8 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
9 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
10 The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:
A. Ultra red region
B. Visible region
C. Ultraviolet region
D. Any of these

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