MDCAT Physics Chapter 12 MCQ Test With Answer for (Atomic spectra)

The students can get the MCQs of Chapter 12 of Physics from this page. The MCQs of all the other chapters are also available that help the students during their preparation phase of MDCAT. The candidates can access the MCQs easily in a hassle-free manner so that they can solve them to strengthen their preparation.

MCQ's Test For MDCAT Physics Chapter 12 Atomic spectra MCQ's Test

Try The MCQ's Test For MDCAT Physics Chapter 12 Atomic spectra MCQ's Test

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MDCAT Physics Chapter 12 Atomic spectra MCQ's Test

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Question # 1

Which of the following statement is true about soft X-rays?

Question # 2

The ratio of the longest and shortest wavelength of the Lyman series is approximately:

Question # 3

The minimum energy required to remove an electron is called:

Question # 4

Which one is the correct express of de-Broglie equation for the length of atoms of mass m at temp? T(k=Boltzmann’s constant):

Question # 5

When an electron in an atom goes from a lower to higher its:

Question # 6

Ultraviolet radiation of 6.2 eV falls on an aluminium surface having work function ∅ = 𝟒. 𝟐 𝒆𝑽.
The kinetic energy of the fastest electron emitted is:

Question # 7

Light of frequency 2 times the threshold frequency is incident on the metalsurface. Ifthe frequency is by quartered and intensity is doubled, the photoelectric becomes

Question # 8

How many photons per second does a one-watt bulb emit if its efficiency is 10% and the wavelength of light is 500 nm:

Question # 9

electrons from the surface of a metal when:

Question # 10

The Balmer series is found in the spectrum of:

Question # 11

In photo electric cell, the photo electric current

Question # 12

An electron in the n=1 orbit hydrogen atom is bound by 13.6 eV. If a hydrogen atom is in the n=3 state, how much energy is required to ionize it:

Question # 13

According to Bohr’s theory, a line in the Ballmer series arises when the electron jumps from any of the higher orbits to the orbit with quantum number:

Question # 14

The de-Broglie wavelength of the particle of mass m and energy E is:

Question # 15

Work function of all metals varies from 2 eV to 4eV. It is 4.2 eV for Aluminum and2eV for Sodium. If these two metals are illuminated by same light, the thresholdfrequency ofAluminum is

Question # 16

Choose incorrect about properties of photon

Question # 17

In which region of the electromagnetic spectrum does the Lyman series of hydrogen atom lie?

Question # 18

When ultraviolet rays are incident in metal plate, then photoelectric effect does not occur. It occurs by the incidence of:

Question # 19

What will be the number of photons emitted per second by 25 W source of monochromatic light of wavelength 600 nm:

Question # 20

Temperature of black body radiating at 270c is increased to 327oc, then emittedenergywill increase by

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This online test contains MCQs about following topics:.

a) Describe energy of photon E =hf .
b) Understand the concept of photoelectric effect, threshold frequency and work function energy.
c) Explain why the maximum photoelectric energy is independent of intensity where as photoelectric current is proportional to intensity.
d) Describe Einstein’s Photoelectric equation 2 max 2 1 hf = mv .
e) Define and explain de Broglie wavelength and use p h .
f) Understand discrete energy levels of hydrogen atom and spectral lines
g) Use the relation = hf = (E1 -E2 .
h) Describe the production of X-rays and main features of X-rays tube.
i) Identify use of X-rays.
j) Explain Band Theory and its terms valence band, conduction band and forbidden band.

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MCAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1
Monochromatic light of wavelength 300 nm is incident normally on a surface of area 4 cm2.
If the intensity of light is 150 mW/m2; the rate at which photon strike the surface:
A. 2.53 × 1019
B. 7.5 × 1019
C. 9.1 × 1013
D. 2.53 × 1013
2 Light of frequency 4f0 is incident on the metal of the threshold frequency f0. The maximum kinetic energy of the emitted photoelectrons is
A. 3h f0
B. 3/2h f0
C. 2h f0
D. 1/2h f0
3 The Balmer series is found in the spectrum of:
A. Hydrogen
B. Nitrogen
C. Oxygen
D. All
4 Choose incorrect about properties of photon
A. Rest mass of photon is zero
B. A photon is never at rest
C. Photon is not deflected by electric field not by magnetic field
D. The velocity of photon is different in different media
5 Which one is the correct express of de-Broglie equation for the length of atoms of mass m at temp? T(k=Boltzmann’s constant):
A.
6 electrons from the surface of a metal when:
A. It is heated to a high temperature
B. Radiation of suitable wavelength falls on it
C. Electrons of suitable velocity strike it
D. It is placed in a strong electric field
7 Which of the following is not true?
A. The Lyman series is a continuous spectrum
B. The Ballmer series is a line spectrum in the visible region
C. The Paschen series is a line spectrum in the infrared region
D. The spectral series formula can be derived from Rutherford’s model of the hydrogen atom 18. The photoelectric effect is the ejection of
8 What is the momentum of a photon of light of wavelength 500 nm in kgm/s:
A. 1.32 × 10−21
B. 1.32 × 10−23
C. 1.32 × 10−25
D. 1.32 × 10−27
9 The momentum of the moving photon is:
A. Zero
B. ℎ
C. 𝜆
D. ℎ𝜆
10 Of electron of 50 keV strike a heavy target. Then radiation emitted by target will be
A. Visible light
B. Radio waves
C. Ultraviolet
D. None of these

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