MDCAT Physics Chapter 15 MCQ Test With Answer for (Modern Physics)

MCQ's Test For MDCAT Physics Chapter 15 Modern Physics MCQ's Test

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MDCAT Physics Chapter 15 Modern Physics MCQ's Test

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Question # 1

The dimensions of Planck’s constant “h” are same as that of:

Question # 2

In a photocell, sodium and potassium emit electrons for:

Question # 3

The reverse process of photo-electric effect is called:

Question # 4

A human eye can detect the electromagnetic radiations of the type:

Question # 5

Interference and diffraction of light confirms its:

Question # 6

Davisson and Germer received the Nobel prize for their work on:

Question # 7

De-Broglie received the Nobel prize on his work on:

Question # 8

Moving photons posses:

Question # 9

Rest mass energy of electron is:

Question # 10

There is a certain frequency below which no electrons are emitted from the metal surface, this frequency is known as:

Question # 11

G.P Thomson revealed:

Question # 12

The energy of photon of energy 1 eV is:

Question # 13

In photoelectric effect, if we increase the frequency of the incident light then of the electrons increased

Question # 14

In a photocell, certain metal emits electrons for :

Question # 15

A human eye can detect the electromagnetic radiations of the type:

Question # 16

A photo cell is based on:

Question # 17

The stopping potential for a certain metal is 10 volt, the max. Energy of emitted electron is:

Question # 18

In order to increase the K.E of ejected photo electrons, there should be an increase in:

Question # 19

The maximum kinetic energy of emitted photoelectrons depends upon:

Question # 20

Interference and diffraction confirm:

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Sr.# Question Answer
1 A photo cell is based on:
A. Compton effect
B. Pair production
C. Photo cell
D. All of these
2 The unit Compton wavelength is same as:
A. Compton wavelength
B. Compton frequency
C. Compton shift
D. Both (a) & (b)
3 A human eye can detect the electromagnetic radiations of the type:
A. Infrared radiations
B. For- infrared radiations
C. X-rays radiations
D. Red radiations
4 The energy of photon of energy 1 eV is:
A. 1240 nm
B. 1040 nm
C. 1000 nm
D. 620 nm
5 In a photocell, cesium coated oxidized silver emits electrons for :
A. Visible light
B. Infrared light
C. Ultraviolet light
D. All of these
6 Rest mass energy of electron is:
A. 1.02 MeV
B. 0.51 MeV
C. 931 MeV
D. 200 MeV
7 Photo cells are used for :
A. Security and counting system
B. Automatic door system
C. Automatic street lighting
D. All of these
8 The photoelectric effect was explained by:
A. Einstein
B. Davison
C. Hertz
D. Planck
9 De-Broglie received the Nobel prize in
A. 1929
B. 1937
C. 1928
D. 1924
10 In photoelectric effect, if we increase the frequency of the incident light then of the electrons increased
A. Number
B. K.E
C. P.E
D. Frequency
11 In photoelectric effect, electrons are emitted with:
A. Same energy
B. Different energies
C. Both (a) & (b)
D. Intermittent energies
12 Potassium cathode in photocell emits electrons for a light:
A. Visible
B. Infrared
C. Ultraviolet
D. X-rays
13 The energy of photon of wavelength 620 nm is:
A. 0.5 eV
B. 1.0 eV
C. 1.5 eV
D. 2.0 eV
14 De-Broglie received the Nobel prize on his work on:
A. Wave nature of particle
B. Corpuscular nature of wave
C. Dual nature of particle
D. All of them
15 J.J Thomson finds:
A. Particle nature of the electron
B. Dual nature of electron
C. Wave nature of electron
D. Electromagnetic nature of electron
16 Joule-second is the unit of:
A. Energy
B. Heat
C. Planck’s constant
D. None of these
17 In a photocell, sodium and potassium emit electrons for:
A. Visible light
B. Infrared light
C. Ultraviolet light
D. All of these
18 Which of the particles, electron, proton and neutron moving with same speed has longest wave length?
A. Electron
B. Proton
C. Neutron
D. All have same
19 The maximum energy of the photoelectrons can be determined by making the:
A. Anode positive
B. Anode negative
C. Cathode positive
D. Both (b) & (c)
20 The reverse process of photo-electric effect is called:
A. Pair production
B. Compton effect
C. Annihilation of matter
D. X-rays

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