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All questions of Electronics for UPSC CSE Exam
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
Correct answer is option 'D'. Can you explain this answer?
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
|
Paradigm Institute answered |
Thermionic emission refers to the emission of electrons from a metal surface due to heat.
In the phenomenon of thermionic emission, electrons are emitted due to:- a)Electric field
- b)Magnetic field
- c)Heat energy
- d)Incident light
Correct answer is option 'C'. Can you explain this answer?
In the phenomenon of thermionic emission, electrons are emitted due to:
a)
Electric field
b)
Magnetic field
c)
Heat energy
d)
Incident light
|
|
Paradigm Institute answered |
Thermionic emission occurs due to the heat energy supplied to a metal, which causes the emission of electrons.
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
Correct answer is option 'A'. Can you explain this answer?
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
|
Catalyst Learningacademy answered |
The minimum amount of energy required to remove an electron from the surface of a metal is called the work function.
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
Correct answer is option 'A'. Can you explain this answer?
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
|
|
Catalyst Learningacademy answered |
Secondary emission refers to the process of electron emission due to the impact of high-energy electrons.
Which of the following particles is most commonly emitted in electron capture?- a)Electrons
- b)Protons
- c)Neutrons
- d)Positrons
Correct answer is option 'A'. Can you explain this answer?
Which of the following particles is most commonly emitted in electron capture?
a)
Electrons
b)
Protons
c)
Neutrons
d)
Positrons
|
|
Catalyst Learningacademy answered |
Electron capture involves the capture of an electron by an atomic nucleus.
Which of the following phenomena does NOT involve electron emission?- a)Photoelectric effect
- b)Thermionic emission
- c)Electron capture
- d)Field emission
Correct answer is option 'C'. Can you explain this answer?
Which of the following phenomena does NOT involve electron emission?
a)
Photoelectric effect
b)
Thermionic emission
c)
Electron capture
d)
Field emission
|
|
Paradigm Institute answered |
Electron emission involves the release of electrons, while electron capture involves the capture of an electron by an atomic nucleus.
Which of the following materials exhibits a negative temperature coefficient of resistance?- a)Conductors
- b)Insulators
- c)Semiconductors
- d)Superconductors
Correct answer is option 'C'. Can you explain this answer?
Which of the following materials exhibits a negative temperature coefficient of resistance?
a)
Conductors
b)
Insulators
c)
Semiconductors
d)
Superconductors
|
|
Catalyst Learningacademy answered |
Semiconductors exhibit a negative temperature coefficient of resistance, meaning their resistance decreases with increasing temperature.
Which of the following materials has the highest work function?- a)Sodium
- b)Copper
- c)Silver
- d)Platinum
Correct answer is option 'B'. Can you explain this answer?
Which of the following materials has the highest work function?
a)
Sodium
b)
Copper
c)
Silver
d)
Platinum
|
|
Paradigm Institute answered |
Copper has a higher work function compared to sodium, silver, and platinum.
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.
Correct answer is option 'D'. Can you explain this answer?
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.
|
|
Paradigm Institute answered |
The work function is independent of the frequency of the incident light.
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.
Correct answer is option 'B'. Can you explain this answer?
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.
|
|
Paradigm Institute answered |
The work function is the minimum energy required to remove an electron from an atom or a solid surface.
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
Correct answer is option 'A'. Can you explain this answer?
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
|
|
Catalyst Learningacademy answered |
Secondary emission refers to the process of electron emission from a solid surface when it is bombarded with high-energy electrons.
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
Correct answer is option 'D'. Can you explain this answer?
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
|
|
Catalyst Learningacademy answered |
The emission of electrons from a metal surface when bombarded with high-energy photons is known as the photoelectric effect.
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
Correct answer is option 'B'. Can you explain this answer?
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
|
|
Paradigm Institute answered |
Field emission is the process of electron emission due to the application of an electric field.
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
Correct answer is option 'D'. Can you explain this answer?
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
|
|
Paradigm Institute answered |
The photocurrent in the photoelectric effect depends on the frequency, intensity, and wavelength of the incident light.
The phenomenon of field emission is based on:- a)Quantum tunneling
- b)Thermal excitation
- c)Photon absorption
- d)Electric field induction
Correct answer is option 'A'. Can you explain this answer?
The phenomenon of field emission is based on:
a)
Quantum tunneling
b)
Thermal excitation
c)
Photon absorption
d)
Electric field induction
|
|
Catalyst Learningacademy answered |
Field emission is based on the quantum tunneling of electrons through a potential barrier.
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.
Correct answer is option 'C'. Can you explain this answer?
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.
|
|
Catalyst Learningacademy answered |
The photoelectric effect occurs instantaneously, without any time delay.
Which of the following materials has the highest electron affinity?- a)Noble gases
- b)Alkali metals
- c)Halogens
- d)Transition metals
Correct answer is option 'C'. Can you explain this answer?
Which of the following materials has the highest electron affinity?
a)
Noble gases
b)
Alkali metals
c)
Halogens
d)
Transition metals
|
|
Paradigm Institute answered |
Halogens have the highest electron affinity among the given options.
Which of the following devices uses thermionic emission?- a)Cathode ray tube
- b)Light-emitting diode
- c)Solar cell
- d)X-ray machine
Correct answer is option 'A'. Can you explain this answer?
Which of the following devices uses thermionic emission?
a)
Cathode ray tube
b)
Light-emitting diode
c)
Solar cell
d)
X-ray machine
|
|
Paradigm Institute answered |
Cathode ray tubes use thermionic emission to generate electrons for producing a beam of electrons.
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.
Correct answer is option 'D'. Can you explain this answer?
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.
|
|
Catalyst Learningacademy answered |
The intensity of the incident light does not affect the occurrence of the photoelectric effect.
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
Correct answer is option 'C'. Can you explain this answer?
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
|
|
Paradigm Institute answered |
The emission of electrons from a metal surface when exposed to light is known as the photoelectric effect.
Chapter doubts & questions for Electronics - Lucent for GK 2025 is part of UPSC CSE exam preparation. The chapters have been prepared according to the UPSC CSE exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for UPSC CSE 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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