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 electric field lines start from:

Question # 2

The photocopying process is called:

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

The inkjet printer eject a thin stream of:

Question # 8

Lyman series in the spectrum of hydrogen exists in the :

Question # 9

Coulomb multiplied by volt by volt gives the unit called:

Question # 10

A metastable stae:

Question # 11

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

Question # 12

The results of spectra obtained by Blamer were expressed in 1896 by

Question # 13

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

Question # 14

Graph of Black body radiation is example of

Question # 15

The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:

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Sr.# Question Answer
1 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
2 Tick the series which lie/s in. the infra-red region.
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
3 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
4 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
5 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
6 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
7 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
8 The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is
A. 1.24 x 10-10m
B. 7.92 x 10-20m
C. 2.78 x 10-14m
D. 3.88 x 10-11m
9 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
10 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
11 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
12 Braking radiation causes:
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm
13 CT scanning is the abbreviated name of
A. Computed Technology
B. Computed Technique
C. Computed Technology
D. Computerized Technique
14 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
15 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays

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