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

00:00
Question # 1

Intensity of light from a point source at the edge of unit sphere will be:

Question # 2

In electron microscope, we use high speed electrons because them

Question # 3

Light of frequency 4f0 is incident on the metal of the threshold frequency f0. The maximum kinetic energy of the emitted photoelectrons is

Question # 4

The minimum energy required to remove an electron is called:

Question # 5

The hydrogen atoms are excited to the stationary state designated by the principal quantum number n=4, the number of maximum spectral lines are observe:

Question # 6

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 # 7

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 # 8

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 # 9

In photo electric cell, the photo electric current

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

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 # 15

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 # 16

In photoelectric effect experiment, stopping potential depend upon

Question # 17

For X-rays which of the following is not correct:

Question # 18

What is the momentum of a photon of light of wavelength 500 nm in kgm/s:

Question # 19

The Balmer series is found in the spectrum of:

Question # 20

An electron and a proton are accelerated through the same potential. If their masses are me and mp respectively, then the ratio of their de-Broglie wavelength is:

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By practicing the online MCQs, the students have better insight into all the topics included in the chapter. After preparing, the students should spend the maximum time solving the MCQs. It will help the students to ace the exam with a better score. The primary purpose of providing online MCQs is to facilitate the students so they can prepare for the upcoming exam in a better way. Moreover, it is also mandatory for the students to score the maximum marks to get admission to medical and dental colleges. For further updates, keep visiting this platform.

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 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
2 To find longest wavelength radiation in Ballmer series, the value of n used is:
A. 2
B. 3
C. 4
D. ∞
3 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
A. Less than Sodium
B. Equal to that of Sodium
C. Grater than Sodium
D. Can’t be decided
4 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
5 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
6 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
7 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.
8 Maximum speed of electrons in X-rays tube which is producing X-rays photons of frequency f is
9 The de-Broglie wavelength of the particle of mass m and energy E is:
B. ℎ
C. 𝜆 = ℎ√2𝑚𝐸
D. 𝜆 = 1
10 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

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