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

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

Question # 2

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

Question # 3

The inkjet printer eject a thin stream of:

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

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

Question # 6

The electric field lines start from:

Question # 7

In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them

Question # 8

Braking radiation causes:

Question # 9

Tick the series which lies in the visible region:

Question # 10

The He-Ne laser discharge tube is filled with:

Question # 11

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

Question # 12

Graph of Black body radiation is example of

Question # 13

The process of formation of spectrum is called:

Question # 14

The range of wavelengths of colurs in the visible colours is

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true
2 The first shell near the neucles is
A. L-shell
B. X-shell
C. N-shell
D. M-shell
3 Braking radiation causes:
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm
4 The photocopying process is called:
A. Geography
B. Sonography
C. Xerography
D. Zerography
5 A metastable stae:
A. Is an excited state
B. Is that in which excited electron is stable
C. Is that in which excited electron is usually unstable
D. Means a time interval of 10-8second
6 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
7 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
8 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
9 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays
10 The inkjet printer eject a thin stream of:
A. Water
B. Oil
C. Ink
D. Any above

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