ECAT Pre Engineering Physics Chapter 20 MCQ Test With Answer

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

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

Question # 2

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

Question # 3

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

Question # 4

The He-Ne laser discharge tube is filled with:

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

Coulomb multiplied by volt by volt gives the unit called:

Question # 10

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

Question # 11

Tick the series which lie/s in. the infra-red region.

Question # 12

The range of wavelengths of colurs in the visible colours is

Question # 13

Static electricity is produced by the transfer of:

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 The inkjet printer eject a thin stream of:
A. Water
B. Oil
C. Ink
D. Any above
3 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
4 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true
5 Energy required by an electron revolving in certain orbit to jump to an excited state is called:
A. Ionization energy
B. Ionization potential
C. Excitation energy
D. Excitation potential
6 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
7 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
8 Static electricity is produced by the transfer of:
A. Electrons
B. Protons
C. One fluid
D. Two fluid
9 CT scanning is the abbreviated name of
A. Computed Technology
B. Computed Technique
C. Computed Technology
D. Computerized Technique
10 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

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