All questions of Electronic Components for Grade 9 Exam
With which group of items could you not build a complete circuit?- a) Crocodile leads, bulbs, switch, buzzer
- b) Bulbs, crocodile leads, cell
- c) Cell, switch, buzzer, crocodile leads
- d) Wires, bulb, cell
Correct answer is option 'A'. Can you explain this answer?
a)
Crocodile leads, bulbs, switch, buzzer
b)
Bulbs, crocodile leads, cell
c)
Cell, switch, buzzer, crocodile leads
d)
Wires, bulb, cell
|
Yash Sen answered |
Understanding Circuit Components
To determine which group of items cannot form a complete circuit, it's essential to know the basic components required for a functioning circuit.
Essential Components of a Circuit:
- Power Source: Such as a battery or cell, which provides the electrical energy.
- Conductors: Typically wires or crocodile leads that connect components.
- Load: This can be a bulb, buzzer, or any device that uses electricity.
- Control Element: A switch that can open or close the circuit.
Analysis of Option A:
- Crocodile Leads: These are conductors and can connect components.
- Bulbs: Serve as a load that lights up when electricity flows.
- Switch: Allows control over the flow of electricity.
- Buzzer: Another type of load that can produce sound.
While this group seems to have all the necessary components, it lacks a power source. Without a cell or battery, the circuit cannot be powered, making it impossible to complete the circuit.
Analysis of Other Options:
- Option B: Contains bulbs, crocodile leads, and a cell. This can form a circuit as it has a power source and a load.
- Option C: Includes a cell, switch, buzzer, and crocodile leads, allowing for a complete circuit with control and a load.
- Option D: Comprises wires, a bulb, and a cell, which can also form a functioning circuit.
Conclusion:
The correct answer is option 'A' because it lacks a power source, making it impossible to create a complete circuit.
To determine which group of items cannot form a complete circuit, it's essential to know the basic components required for a functioning circuit.
Essential Components of a Circuit:
- Power Source: Such as a battery or cell, which provides the electrical energy.
- Conductors: Typically wires or crocodile leads that connect components.
- Load: This can be a bulb, buzzer, or any device that uses electricity.
- Control Element: A switch that can open or close the circuit.
Analysis of Option A:
- Crocodile Leads: These are conductors and can connect components.
- Bulbs: Serve as a load that lights up when electricity flows.
- Switch: Allows control over the flow of electricity.
- Buzzer: Another type of load that can produce sound.
While this group seems to have all the necessary components, it lacks a power source. Without a cell or battery, the circuit cannot be powered, making it impossible to complete the circuit.
Analysis of Other Options:
- Option B: Contains bulbs, crocodile leads, and a cell. This can form a circuit as it has a power source and a load.
- Option C: Includes a cell, switch, buzzer, and crocodile leads, allowing for a complete circuit with control and a load.
- Option D: Comprises wires, a bulb, and a cell, which can also form a functioning circuit.
Conclusion:
The correct answer is option 'A' because it lacks a power source, making it impossible to create a complete circuit.
Which component in a circuit converts electrical energy into light?- a)Switch
- b)Battery
- c)Light bulb
- d)Buzzer
Correct answer is option 'C'. Can you explain this answer?
Which component in a circuit converts electrical energy into light?
a)
Switch
b)
Battery
c)
Light bulb
d)
Buzzer
|
Focus Academy answered |
A light bulb converts electrical energy into light when electricity flows through it.
What is the primary role of a battery in an electric circuit?- a)To act as a switch
- b)To control the flow of electricity
- c)To provide the necessary power for the circuit
- d)To emit light and sound
Correct answer is option 'C'. Can you explain this answer?
What is the primary role of a battery in an electric circuit?
a)
To act as a switch
b)
To control the flow of electricity
c)
To provide the necessary power for the circuit
d)
To emit light and sound
|
Torcia Education answered |
A battery provides the driving force for electricity to flow from the positive to the negative pole, powering the entire circuit.
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.
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.
What is an electrical circuit?- a) A collection of electrical equipment
- b) A path around which electrical current flows
- c) A series of conductors and insulators
- d) A light bulb and battery
Correct answer is option 'B'. Can you explain this answer?
a)
A collection of electrical equipment
b)
A path around which electrical current flows
c)
A series of conductors and insulators
d)
A light bulb and battery
|
|
Torcia Education answered |
Electrical current flows in one direction from the negative pole of a battery around a complete circuit to the positive pole of the battery
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 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 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.
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.
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 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.
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.
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.
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.
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.
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 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.
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.
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 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.
You have made a simple circuit with one bulb. If you wanted to add an extra bulb without the first bulb dimming, what would you need to design?- a) A series circuit
- b) A parallel circuit
- c) A complex circuit
- d) An incomplete circuit
Correct answer is option 'B'. Can you explain this answer?
a)
A series circuit
b)
A parallel circuit
c)
A complex circuit
d)
An incomplete circuit
|
|
Focus Academy answered |
Unlike a series circuit, the lamps stay bright if you add more in a parallel circuit
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.
Chapter doubts & questions for Electronic Components - Physics 2025 is part of Grade 9 exam preparation. The chapters have been prepared according to the Grade 9 exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for Grade 9 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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