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

Question # 2

In photoelectric effect experiment, stopping potential depend upon

Question # 3

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

Question # 4

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

Question # 5

The threshold frequency depends on the nature on:

Question # 6

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 # 7

In photo electric cell, the photo electric current

Question # 8

As the intensity of incident light increases:

Question # 9

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

Question # 10

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

Question # 11

Which of the following is not true?

Question # 12

The maximum energy of the electrons released in a photo cell is independent of:

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

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 # 15

In electron microscope, we use high speed electrons because them

Question # 16

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 # 17

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

Question # 18

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

Question # 19

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

Question # 20

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

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Prepare Complete Set Wise MDCAT Physics Chapter 12 Atomic spectra MCQ's Test MCQs Online With Answers


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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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Sr.# Question Answer
1 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
2 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
3 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
4 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:
A. 4V
B. 8V
C. V/4
D. V/8
5 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:
A. 1
B. 2
C. 3
D. 4
6 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
7 Continuous spectrum of X-rays id due to an effect known as
A. Photoelectric effect
B. Compton effect
C. Heisenberg effect
D. Bremsstrahlung
8 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
9 The Balmer series is found in the spectrum of:
A. Hydrogen
B. Nitrogen
C. Oxygen
D. All
10 The momentum of the moving photon is:
A. Zero
B. ℎ
C. 𝜆
D. ℎ𝜆
11 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
12 In electron microscope, we use high speed electrons because them
A. Penetration power is higher
B. Wavelength is smaller
C. Frequency is smaller
D. K.E is smaller
13 In which region of the electromagnetic spectrum does the Lyman series of hydrogen atom lie?
A. Infrared
B. Visible
C. Ultraviolet
D. X-rays
14 Temperature of black body radiating at 270c is increased to 327oc, then emittedenergywill increase by
A. 2 times
B. 12 times
C. 16 times
D. 4 times
15 In photoelectric effect experiment, stopping potential depend upon
A. Intensity of light
B. Frequency of light
C. Photoelectric current
D. Both A and B
16 As the intensity of incident light increases:
A. Photoelectric current increases
B. Photoelectric current decreases
C. Kinetic energy of emitted photoelectrons increases
D. Kinetic energy of emitted photoelectrons decreases
17 Intensity of light from a point source at the edge of unit sphere will be:
A. 𝑃
B. 𝑃
C. P(4π)
D. 4𝜋
18 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
19 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
20 The threshold frequency depends on the nature on:
A. Natural frequency
B. Photosensitive anode
C. Photosensitive cathode
D. Photon

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