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

In electron microscope, we use high speed electrons because them

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

To find longest wavelength radiation in Ballmer series, the value of n used is:

Question # 4

The minimum energy required to remove an electron is called:

Question # 5

The momentum of the moving photon is:

Question # 6

In photoelectric effect experiment, stopping potential depend upon

Question # 7

The threshold frequency depends on the nature on:

Question # 8

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

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

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

Question # 11

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 # 12

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 # 13

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 # 14

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

Question # 15

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 # 16

electrons from the surface of a metal when:

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

When an electron in an atom goes from a lower to higher its:

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

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

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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 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 For X-rays which of the following is not correct:
A. Cause of ionization in air when they pass through it
B. Can be deflected by electric and magnetic fields
C. Can be used to detect flaws in metal casting
D. Travel with the speed of light
3 To find longest wavelength radiation in Ballmer series, the value of n used is:
A. 2
B. 3
C. 4
D. ∞
4 The de-Broglie wavelength of the particle of mass m and energy E is:
B. ℎ
C. 𝜆 = ℎ√2𝑚𝐸
D. 𝜆 = 1
5 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
6 How many photons per second does a one-watt bulb emit if its efficiency is 10% and the wavelength of light is 500 nm:
A. 2.53 × 1017
B. 2.53 × 1019
C. 7.5 × 1019
D. 7.5 × 1017
7 The shortest wavelength of X-rays emitted from an X-rays tube depends on the:
A. Current in the tube
B. Voltage applied to the tube
C. Nature of gas in the tube
D. Nature of material of tube
8 The momentum of the moving photon is:
A. Zero
B. ℎ
C. 𝜆
D. ℎ𝜆
9 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
10 In photo electric cell, the photo electric current
A. Decreases with increase in frequency of light
B. Depends on intensity and frequency of light
C. Does not depend upon the frequency of light and but depends upon intensity of light
D. Increases with increase in frequency of light

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