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

In photo electric cell, the photo electric current

Question # 2

The minimum energy required to remove an electron is called:

Question # 3

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 # 4

Which of the following is not true?

Question # 5

As the intensity of incident light increases:

Question # 6

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

Question # 7

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

Question # 8

Light elements do not emit X-rays because

Question # 9

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 # 10

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 # 11

The momentum of the moving photon is:

Question # 12

Choose incorrect about properties of photon

Question # 13

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

Question # 14

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 # 15

In photoelectric effect experiment, stopping potential depend upon

Question # 16

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

Question # 17

electrons from the surface of a metal when:

Question # 18

de-Broglie wavelength associated with an electron moving at a speed of 1x106 ms-1 is

Question # 19

The shortest wavelength of X-rays emitted from an X-rays tube depends on the:

Question # 20

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

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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 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:
A. 1
B. mp/me
C. me/mp
3 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
4 To find longest wavelength radiation in Ballmer series, the value of n used is:
A. 2
B. 3
C. 4
D. ∞
5 The potential difference applied to an X-rays tube is increased. As a result, in the emitted radiation
A. The intensity increases
B. The minimum wavelength decrease
C. The intensity remains unchanged
D. Both B & C
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
A. Quadrupled
B. Zero
C. Doubled
D. Halved
7 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
8 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
9 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
10
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

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