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MCQ's Test For Physics ECAT Pre Engineering Chapter 20 Atomic Spectra
Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 20 Atomic Spectra
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Total Questions15
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Time Allowed20
Physics ECAT Pre Engineering Chapter 20 Atomic Spectra
00:00
Question # 1
The process of formation of spectrum is called:
Question # 2
Gaussian surface is always:
Question # 3
The results of spectra obtained by Blamer were expressed in 1896 by
Question # 4
The shell closer to the nucleus is called:
Question # 5
If the distance between two charges is doubled,the force between them will become:
Question # 6
X-rays can penetrate in a solid matte through a distance of several:
Question # 7
Selenium is:
Question # 8
In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:
Question # 9
Coulomb multiplied by volt by volt gives the unit called:
Question # 10
Laser is a beam of:
Question # 11
Lyman series in the spectrum of hydrogen exists in the :
Question # 12
The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is
Question # 13
The lasing or active medium in He-Ne laser discharge tube is:
Question # 14
The inkjet printer eject a thin stream of:
Question # 15
The value of the metastable state for Neon is
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ECAT Physics Chapter 20 Important MCQ's
| Sr.# | Question | Answer |
|---|---|---|
| 1 | Tick the series which lie/s in. the infra-red region. |
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
|
| 2 | 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 |
A. Less than atmospheric pressure
B. Much less than atmospheric pressure
C. Greater than atmospheric pressure
D. Much greater than atmospheric pressure
|
| 3 | 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)
|
| 4 | 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
|
| 5 | 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
|
| 6 | 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
|
| 7 | By CAT scans, we can detect the density difference of the order of: |
A. 1%
B. 20%
C. 30%
D. 50%
|
| 8 | 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
|
| 9 | Balmer series was identified in: |
A. 1685
B. 1785
C. 1885
D. 1985
|
| 10 | The range of wavelengths of colurs in the visible colours is |
A. 140 nm to 456 nm
B. 10 nm to 56 nm
C. 410 nm to 656 nm
D. 910 nm to 956 nm
|
Test Questions