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 value of the metastable state for Neon is

Question # 2

The range of wavelengths of colurs in the visible colours is

Question # 3

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

Question # 4

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

Question # 5

The spectrum emitted from hydrogen filled discharge tube is:

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

Energy required by an electron revolving in certain orbit to jump to an excited state is called:

Question # 10

Laser is a beam of:

Question # 11

Tick the series which lies in the visible region:

Question # 12

Selenium is:

Question # 13

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

Question # 14

We can excite an atom by

Question # 15

The first shell near the neucles is

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
2 The first shell near the neucles is
A. L-shell
B. X-shell
C. N-shell
D. M-shell
3 Tick the series which lie/s in. the infra-red region.
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
4 Balmer series lies in that region of electromagnetic wave spectrum which is called:
A. Visible region
B. Invisible region
C. Infra-red region
D. ultraviolet region
5 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays
6 The natural arrangement of colours in the spectrum of white light spectrum is
A. VIBGYOR
B. ROYBGIV
C. ROYBIGV
D. BIGROYV
7 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
8 The inkjet printer eject a thin stream of:
A. Water
B. Oil
C. Ink
D. Any above
9 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
10 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron

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