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

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 # 2

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 # 3

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

Question # 4

Choose incorrect about properties of photon

Question # 5

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 # 6

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

Question # 7

In photoelectric effect experiment, stopping potential depend upon

Question # 8

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 # 9

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 # 10

electrons from the surface of a metal when:

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

Figure represents a graph of kinetic energy (K) of the photoelectrons (in eV) and frequency (v) for a metal used as cathode in photoelectric experiment. The work function of metal is:

Question # 15

In electron microscope, we use high speed electrons because them

Question # 16

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

Question # 17

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

Question # 18

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

Question # 19

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 # 20

How many photons per second does a one-watt bulb emit if its efficiency is 10% and the wavelength of light is 500 nm:

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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 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
2 Choose incorrect about properties of photon
A. Rest mass of photon is zero
B. A photon is never at rest
C. Photon is not deflected by electric field not by magnetic field
D. The velocity of photon is different in different media
3 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
4 The Balmer series is found in the spectrum of:
A. Hydrogen
B. Nitrogen
C. Oxygen
D. All
5 To find longest wavelength radiation in Ballmer series, the value of n used is:
A. 2
B. 3
C. 4
D. ∞
6 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
7 Threshold wavelength for metal having work function 𝝋 is 𝝀. What is the threshold wavelength for metal having work function 2 𝒊𝒔:
A. /𝟐
B. 2
C. 4
D. 𝝀/𝟒
8 The de-Broglie wavelength of the particle of mass m and energy E is:
B. ℎ
C. 𝜆 = ℎ√2𝑚𝐸
D. 𝜆 = 1
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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