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

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MDCAT Physics Chapter 12 Atomic spectra MCQ's Test

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Question # 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

Question # 2

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

Question # 3

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

Question # 4

In photoelectric effect experiment, stopping potential depend upon

Question # 5

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

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

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

Question # 8

Choose incorrect about properties of photon

Question # 9

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 # 10

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

Question # 11

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

Question # 12

The potential difference applied to an X-rays tube is increased. As a result, in the emitted radiation

Question # 13

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

Question # 14

The Balmer series is found in the spectrum of:

Question # 15

Continuous spectrum of X-rays id due to an effect known as

Question # 16

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

Question # 17

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 # 18

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

Question # 19

As the intensity of incident light increases:

Question # 20

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:

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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 Maximum speed of electrons in X-rays tube which is producing X-rays photons of frequency f is
2 The threshold frequency depends on the nature on:
A. Natural frequency
B. Photosensitive anode
C. Photosensitive cathode
D. Photon
3 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
4 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
5 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
6 The maximum energy of the electrons released in a photo cell is independent of:
A. Frequency of incident light
B. Intensity of incident light
C. Nature of cathode rays
D. None of these
7
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
8 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
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:
A. 4V
B. 8V
C. V/4
D. V/8
10 The de-Broglie wavelength of the particle of mass m and energy E is:
B. ℎ
C. 𝜆 = ℎ√2𝑚𝐸
D. 𝜆 = 1

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