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Test: Electron Emission - UPSC MCQ

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20 Questions MCQ Test Lucent for GK - Test: Electron Emission

Test: Electron Emission for UPSC 2024 is part of Lucent for GK preparation. The Test: Electron Emission questions and answers have been prepared according to the UPSC exam syllabus.The Test: Electron Emission MCQs are made for UPSC 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Electron Emission below.

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Test: Electron Emission - Question 1

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Which of the following phenomena does NOT involve electron emission?

A.
Photoelectric effect
B.
Thermionic emission
C.
Electron capture
D.
Field emission

Detailed Solution for Test: Electron Emission - Question 1

Electron emission involves the release of electrons, while electron capture involves the capture of an electron by an atomic nucleus.

Test: Electron Emission - Question 2

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The emission of electrons from a metal surface due to heat is known as:

A.
Field emission
B.
Secondary emission
C.
Photoelectric effect
D.
Thermionic emission

Detailed Solution for Test: Electron Emission - Question 2

Thermionic emission refers to the emission of electrons from a metal surface due to heat.

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Test: Electron Emission - Question 3

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The minimum amount of energy required to remove an electron from the surface of a metal is called:

A.
Work function
B.
Ionization energy
C.
Threshold energy
D.
Activation energy

Detailed Solution for Test: Electron Emission - Question 3

The minimum amount of energy required to remove an electron from the surface of a metal is called the work function.

Test: Electron Emission - Question 4

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The photocurrent in the photoelectric effect depends on:

A.
Frequency of incident light
B.
Intensity of incident light
C.
Wavelength of incident light
D.
All of the above

Detailed Solution for Test: Electron Emission - Question 4

The photocurrent in the photoelectric effect depends on the frequency, intensity, and wavelength of the incident light.

Test: Electron Emission - Question 5

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Which of the following materials exhibits a negative temperature coefficient of resistance?

A.
Conductors
B.
Insulators
C.
Semiconductors
D.
Superconductors

Detailed Solution for Test: Electron Emission - Question 5

Semiconductors exhibit a negative temperature coefficient of resistance, meaning their resistance decreases with increasing temperature.

Test: Electron Emission - Question 6

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In the phenomenon of thermionic emission, electrons are emitted due to:

A.
Electric field
B.
Magnetic field
C.
Heat energy
D.
Incident light

Detailed Solution for Test: Electron Emission - Question 6

Thermionic emission occurs due to the heat energy supplied to a metal, which causes the emission of electrons.

Test: Electron Emission - Question 7

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The phenomenon of field emission is based on:

A.
Quantum tunneling
B.
Thermal excitation
C.
Photon absorption
D.
Electric field induction

Detailed Solution for Test: Electron Emission - Question 7

Field emission is based on the quantum tunneling of electrons through a potential barrier.

Test: Electron Emission - Question 8

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Which of the following devices uses thermionic emission?

A.
Cathode ray tube
B.
Light-emitting diode
C.
Solar cell
D.
X-ray machine

Detailed Solution for Test: Electron Emission - Question 8

Cathode ray tubes use thermionic emission to generate electrons for producing a beam of electrons.

Test: Electron Emission - Question 9

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The process of electron emission from a solid surface when it is bombarded with high-energy electrons is known as:

A.
Secondary emission
B.
Photoelectric effect
C.
Field emission
D.
Thermionic emission

Detailed Solution for Test: Electron Emission - Question 9

Secondary emission refers to the process of electron emission from a solid surface when it is bombarded with high-energy electrons.

Test: Electron Emission - Question 10

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The emission of electrons from a metal surface when exposed to light is called the:

A.
Thermionic emission
B.
Field emission
C.
Photoelectric effect
D.
Secondary emission

Detailed Solution for Test: Electron Emission - Question 10

The emission of electrons from a metal surface when exposed to light is known as the photoelectric effect.

Test: Electron Emission - Question 11

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Which of the following is NOT a requirement for the occurrence of the photoelectric effect?

A.
The incident light must have sufficient energy.
B.
The metal surface must have a low work function.
C.
The incident light must be monochromatic.
D.
The intensity of the incident light must be high.

Detailed Solution for Test: Electron Emission - Question 11

The intensity of the incident light does not affect the occurrence of the photoelectric effect.

Test: Electron Emission - Question 12

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Which of the following statements about the work function is correct?

A.
It depends on the intensity of incident light.
B.
It is the energy required to remove an electron from an atom.
C.
It determines the speed of emitted electrons.
D.
It is the same for all materials.

Detailed Solution for Test: Electron Emission - Question 12

The work function is the minimum energy required to remove an electron from an atom or a solid surface.

Test: Electron Emission - Question 13

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Which of the following particles is most commonly emitted in electron capture?

A.
Electrons
B.
Protons
C.
Neutrons
D.
Positrons

Detailed Solution for Test: Electron Emission - Question 13

Electron capture involves the capture of an electron by an atomic nucleus.

Test: Electron Emission - Question 14

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The process of electron emission due to the application of an electric field is called:

A.
Thermionic emission
B.
Field emission
C.
Secondary emission
D.
Photoelectric effect

Detailed Solution for Test: Electron Emission - Question 14

Field emission is the process of electron emission due to the application of an electric field.

Test: Electron Emission - Question 15

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Which of the following statements about the photoelectric effect is correct?

A.
The photoelectric current decreases with increasing intensity of incident light.
B.
The photoelectric current depends on the color of the incident light.
C.
The photoelectric effect is instantaneous.
D.
The photoelectric effect can occur even with low-frequency light.

Detailed Solution for Test: Electron Emission - Question 15

The photoelectric effect occurs instantaneously, without any time delay.

Test: Electron Emission - Question 16

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Which of the following materials has the highest electron affinity?

A.
Noble gases
B.
Alkali metals
C.
Halogens
D.
Transition metals

Detailed Solution for Test: Electron Emission - Question 16

Halogens have the highest electron affinity among the given options.

Test: Electron Emission - Question 17

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The emission of electrons from a metal surface when bombarded with high-energy photons is known as:

A.
Secondary emission
B.
Thermionic emission
C.
Field emission
D.
Photoelectric effect

Detailed Solution for Test: Electron Emission - Question 17

The emission of electrons from a metal surface when bombarded with high-energy photons is known as the photoelectric effect.

Test: Electron Emission - Question 18

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Which of the following statements about the work function is true?

A.
It depends on the intensity of the incident light.
B.
It is the same for all materials.
C.
It is the energy required to remove a proton from an atom.
D.
It is independent of the frequency of the incident light.

Detailed Solution for Test: Electron Emission - Question 18

The work function is independent of the frequency of the incident light.

Test: Electron Emission - Question 19

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The process of electron emission due to the impact of high-energy electrons is called:

A.
Secondary emission
B.
Field emission
C.
Photoelectric effect
D.
Thermionic emission

Detailed Solution for Test: Electron Emission - Question 19

Secondary emission refers to the process of electron emission due to the impact of high-energy electrons.

Test: Electron Emission - Question 20

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Which of the following materials has the highest work function?

A.
Sodium
B.
Copper
C.
Silver
D.
Platinum

Detailed Solution for Test: Electron Emission - Question 20

Copper has a higher work function compared to sodium, silver, and platinum.

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