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

00:00
Question # 1

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

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

In photoelectric effect experiment, stopping potential depend upon

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

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 # 11

Light elements do not emit X-rays because

Question # 12

The momentum of the moving photon is:

Question # 13

Of electron of 50 keV strike a heavy target. Then radiation emitted by target will be

Question # 14

The Balmer series is found in the spectrum of:

Question # 15

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

Question # 16

In electron microscope, we use high speed electrons because them

Question # 17

A proton, accelerated through a p.d V has a certain de Broglie wavelength. In order to have the same de Broglie wavelength, an 𝑎 −particles must be accelerated through a potential difference:

Question # 18

Which of the following is not true?

Question # 19

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

Question # 20

The threshold frequency depends on the nature on:

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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 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
2 The Balmer series is found in the spectrum of:
A. Hydrogen
B. Nitrogen
C. Oxygen
D. All
3 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
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 In which region of the electromagnetic spectrum does the Lyman series of hydrogen atom lie?
A. Infrared
B. Visible
C. Ultraviolet
D. X-rays
6 Intensity of light from a point source at the edge of unit sphere will be:
A. 𝑃
B. 𝑃
C. P(4π)
D. 4𝜋
7 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
8 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
9 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
A. Four times
B. Half
C. Double
D. Zero
10 A proton and an 𝑎 − 𝒑𝒂𝒓𝒕𝒊𝒄𝒍𝒆 are accelerated through same voltage, the ratio of their de- Broglie wavelength will be:
A. 1:2
B. √2: 1
C. 2√2: 1
D. 2:1

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