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

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MDCAT Physics Chapter 12 Atomic spectra MCQ's Test

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Question # 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:

Question # 2

To find longest wavelength radiation in Ballmer series, the value of n used is:

Question # 3

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

Question # 4

The minimum energy required to remove an electron is called:

Question # 5

The frequency and work function of an incident photon are n and𝝋𝟎. If f0 is the threshold frequency, then necessary condition for the emission of photo electron is:

Question # 6

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

Question # 7

The threshold frequency depends on the nature on:

Question # 8

If an electron is accelerated such that its K.E is 4 times of its rest mass energythen thetotal relativistic energy of electrons is about

Question # 9

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 # 10

The potential difference applied to an X-rays tube is increased. As a result, in the emitted radiation

Question # 11

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 # 12

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 # 13

Light of frequency 1.5 times the threshold frequency is incident on a photo sensitive material. If the frequency is halved and intensity is doubled the photo electric current becomes

Question # 14

Choose incorrect about properties of photon

Question # 15

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

Question # 16

In photoelectric effect experiment, stopping potential depend upon

Question # 17

electrons from the surface of a metal when:

Question # 18

Which of the following is not true?

Question # 19

As the intensity of incident light increases:

Question # 20

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

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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 As the intensity of incident light increases:
A. Photoelectric current increases
B. Photoelectric current decreases
C. Kinetic energy of emitted photoelectrons increases
D. Kinetic energy of emitted photoelectrons decreases
2 A photo cell receives light from a source at 50 cm away and produces 40mAcurrent inthe circuit. When the same source at is at distance 1 m from photo cell,current in the circuit will be
A. 20 mA
B. 80mA
C. 60 mA
D. 10 mA
3 The shortest wavelength of X-rays emitted from an X-rays tube depends on the:
A. Current in the tube
B. Voltage applied to the tube
C. Nature of gas in the tube
D. Nature of material of tube
4 When ultraviolet rays are incident in metal plate, then photoelectric effect does not occur. It occurs by the incidence of:
A. x-rays
B. Infrared rays
C. Radio wave
D. Greenhouse effect
5 Maximum speed of electrons in X-rays tube which is producing X-rays photons of frequency f is
6 In photoelectric effect experiment, stopping potential depend upon
A. Intensity of light
B. Frequency of light
C. Photoelectric current
D. Both A and B
7 Intensity of light from a point source at the edge of unit sphere will be:
A. 𝑃
B. 𝑃
C. P(4π)
D. 4𝜋
8
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:
A. 4 eV
B. 2 eV
C. 2.2 eV
D. 1.2 eV
9 de-Broglie wavelength associated with an electron moving at a speed of 1x106 ms-1 is
A. 4x10-10 ms-1
B. 5x10-10 m
C. 6x10-10 m
D. 7x10-10 m
10 Continuous spectrum of X-rays id due to an effect known as
A. Photoelectric effect
B. Compton effect
C. Heisenberg effect
D. Bremsstrahlung

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