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

The minimum energy required to remove an electron is called:

Question # 2

Maximum speed of electrons in X-rays tube which is producing X-rays photons of frequency f is

Question # 3

A proton and an 𝑎 − 𝒑𝒂𝒓𝒕𝒊𝒄𝒍𝒆 are accelerated through same voltage, the ratio of their de- Broglie wavelength will be:

Question # 4

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 # 5

Threshold wavelength for metal having work function 𝝋 is 𝝀. What is the threshold wavelength for metal having work function 2 𝒊𝒔:

Question # 6

Which of the following is not true?

Question # 7

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

Question # 8

In photoelectric effect experiment, stopping potential depend upon

Question # 9

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 # 10

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

Question # 11

In photo electric cell, the photo electric current

Question # 12

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 # 13

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

Question # 14

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 # 15

In electron microscope, we use high speed electrons because them

Question # 16

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

Question # 17

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 # 18

Continuous spectrum of X-rays id due to an effect known as

Question # 19

Light elements do not emit X-rays because

Question # 20

Light of frequency 4f0 is incident on the metal of the threshold frequency f0. The maximum kinetic energy of the emitted photoelectrons 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 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:
A. 13.6 eV
B. 4.53 eV
C. 3.4 eV
D. 1.51eV
2 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
A. 5 × 10–12 J
B. 4 × 10–13 J
C. 3 × 10–13 J
D. 6 × 10–12 J
3 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:
A. 2
B. 3
C. 4
D. 6
4 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
5 The de-Broglie wavelength of the particle of mass m and energy E is:
B. ℎ
C. 𝜆 = ℎ√2𝑚𝐸
D. 𝜆 = 1
6 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
7 When an electron in an atom goes from a lower to higher its:
A. K.E. increases, P.E. decreases
B. K.E. increases
C. P.E increases
D. K.E. decrease, P.E. increases
8
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
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 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:
A. < 𝑓0
B. 𝑓 ≥ 𝑓0
C. f = 𝑓0/2
D. None of these

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