Physics Syllabus (JEE Main)
Q. In a nuclear reaction, what is the term for the energy released?
A.
Kinetic energy
B.
Potential energy
C.
Binding energy
D.
Nuclear energy
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Solution
The energy released in a nuclear reaction is referred to as nuclear energy, which is a result of changes in the binding energy of the nucleus.
Correct Answer: D — Nuclear energy
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Q. In a nuclear reaction, what is the term for the mass difference between the reactants and products?
A.
Mass defect
B.
Binding energy
C.
Nuclear fusion
D.
Nuclear fission
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Solution
The mass defect is the difference in mass between the reactants and products in a nuclear reaction, which is related to the binding energy.
Correct Answer: A — Mass defect
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Q. In a p-n junction diode, what happens when it is forward biased?
A.
Depletion region widens
B.
Current flows easily
C.
No current flows
D.
Reverse breakdown occurs
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Solution
When a p-n junction diode is forward biased, the depletion region narrows, allowing current to flow easily through the junction.
Correct Answer: B — Current flows easily
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Q. In a p-n junction diode, what happens when it is reverse-biased?
A.
Current flows freely
B.
Depletion region widens
C.
Holes move towards the n-side
D.
Electrons move towards the p-side
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Solution
When a p-n junction diode is reverse-biased, the depletion region widens, preventing current flow.
Correct Answer: B — Depletion region widens
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Q. In a p-n junction, what is formed at the junction region?
A.
Electric field
B.
Magnetic field
C.
Thermal field
D.
Gravitational field
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Solution
An electric field is formed at the p-n junction due to the diffusion of charge carriers.
Correct Answer: A — Electric field
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Q. In a p-n junction, what is the region called where no charge carriers are present?
A.
Depletion region
B.
Conduction band
C.
Valence band
D.
Neutral zone
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Solution
The depletion region is the area around the p-n junction where charge carriers are depleted, creating an electric field.
Correct Answer: A — Depletion region
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Q. In a p-n junction, what is the region called where no charge carriers exist?
A.
Depletion region
B.
Conduction band
C.
Valence band
D.
Neutral zone
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Solution
The depletion region is the area around the p-n junction where charge carriers have recombined, leaving behind immobile ions.
Correct Answer: A — Depletion region
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Q. In a parallel circuit with three resistors of 2Ω, 3Ω, and 6Ω, what is the equivalent resistance?
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Solution
The equivalent resistance for resistors in parallel is given by 1/R_eq = 1/R1 + 1/R2 + 1/R3. Thus, 1/R_eq = 1/2 + 1/3 + 1/6 = 1. Therefore, R_eq = 1Ω.
Correct Answer: B — 2Ω
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Q. In a parallel circuit with three resistors of 6 ohms, 12 ohms, and 18 ohms, what is the equivalent resistance?
A.
3 ohms
B.
4 ohms
C.
2 ohms
D.
1 ohm
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Solution
Using the formula for resistors in parallel, 1/R_eq = 1/R1 + 1/R2 + 1/R3, we find R_eq = 1 / (1/6 + 1/12 + 1/18) = 3 ohms.
Correct Answer: A — 3 ohms
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Q. In a parallel circuit with three resistors of values 2Ω, 3Ω, and 6Ω, what is the equivalent resistance?
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Solution
1/R_eq = 1/R1 + 1/R2 + 1/R3 = 1/2 + 1/3 + 1/6 = 1. Therefore, R_eq = 3Ω.
Correct Answer: C — 3Ω
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Q. In a parallel circuit with three resistors of values 6 ohms, 3 ohms, and 2 ohms, what is the equivalent resistance?
A.
1.5 ohms
B.
2 ohms
C.
2.5 ohms
D.
3 ohms
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Solution
The formula for equivalent resistance in parallel is 1/R_eq = 1/R1 + 1/R2 + 1/R3. Thus, 1/R_eq = 1/6 + 1/3 + 1/2 = 1/6 + 2/6 + 3/6 = 6/6 = 1, so R_eq = 1 ohm.
Correct Answer: C — 2.5 ohms
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Q. In a parallel circuit with three resistors R1 = 2Ω, R2 = 3Ω, and R3 = 6Ω, what is the equivalent resistance?
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Solution
The equivalent resistance in parallel is given by 1/R_total = 1/R1 + 1/R2 + 1/R3. Thus, 1/R_total = 1/2 + 1/3 + 1/6 = 1Ω.
Correct Answer: A — 1Ω
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Q. In a parallel circuit with two resistors of 4 ohms and 6 ohms, what is the equivalent resistance?
A.
2.4 ohms
B.
10 ohms
C.
24 ohms
D.
12 ohms
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Solution
For parallel resistors, 1/R_eq = 1/R1 + 1/R2. Thus, 1/R_eq = 1/4 + 1/6 = 5/12, so R_eq = 12/5 = 2.4 ohms.
Correct Answer: A — 2.4 ohms
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Q. In a parallel circuit with two resistors of 4 ohms and 6 ohms, what is the total current if the voltage across the circuit is 12V?
A.
2 A
B.
3 A
C.
4 A
D.
5 A
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Solution
First, find the equivalent resistance: 1/R_eq = 1/4 + 1/6 => R_eq = 2.4 ohms. Then, I = V/R_eq = 12V / 2.4Ω = 5 A.
Correct Answer: B — 3 A
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Q. In a parallel circuit with two resistors of 4 ohms and 6 ohms, what is the total current if the voltage across the circuit is 12 V?
A.
2 A
B.
3 A
C.
4 A
D.
5 A
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Solution
First, find the equivalent resistance: 1/R_eq = 1/4 + 1/6 => R_eq = 2.4 ohms. Then, I = V/R_eq = 12 V / 2.4 ohms = 5 A.
Correct Answer: B — 3 A
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Q. In a parallel circuit with two resistors of 4Ω and 6Ω, what is the total current if the voltage across the circuit is 12V?
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Solution
First, find the equivalent resistance: 1/R_eq = 1/4 + 1/6 => R_eq = 2.4Ω. Then, I = V/R_eq = 12V / 2.4Ω = 5A.
Correct Answer: B — 3A
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Q. In a parallel circuit with two resistors of 6 ohms and 3 ohms, what is the equivalent resistance?
A.
2 ohms
B.
4 ohms
C.
1.5 ohms
D.
9 ohms
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Solution
Using the formula for resistors in parallel, 1/R_eq = 1/R1 + 1/R2, we have 1/R_eq = 1/6 + 1/3 = 1/6 + 2/6 = 3/6. Therefore, R_eq = 6/3 = 2 ohms.
Correct Answer: B — 4 ohms
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Q. In a parallel circuit with two resistors R1 = 6Ω and R2 = 3Ω, what is the equivalent resistance?
A.
2Ω
B.
4Ω
C.
1.5Ω
D.
9Ω
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Solution
1/R_eq = 1/R1 + 1/R2 = 1/6 + 1/3 = 1/6 + 2/6 = 3/6, thus R_eq = 2Ω.
Correct Answer: A — 2Ω
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Q. In a parallel circuit, if one resistor fails, what happens to the total current?
A.
It increases.
B.
It decreases.
C.
It remains the same.
D.
It becomes zero.
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Solution
In a parallel circuit, if one resistor fails, the total current decreases because the total resistance increases.
Correct Answer: B — It decreases.
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Q. In a parallel circuit, if one resistor is removed, what happens to the total resistance?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes infinite
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Solution
In a parallel circuit, removing a resistor decreases the total resistance.
Correct Answer: B — Decreases
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Q. In a parallel combination of capacitors, how is the total capacitance calculated?
A.
C_eq = C1 + C2 + C3
B.
1/C_eq = 1/C1 + 1/C2 + 1/C3
C.
C_eq = 1/(C1 + C2 + C3)
D.
C_eq = C1 * C2 * C3
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Solution
In a parallel combination, the total capacitance is simply the sum of the individual capacitances: C_eq = C1 + C2 + C3.
Correct Answer: A — C_eq = C1 + C2 + C3
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Q. In a parallel plate capacitor, if the area of the plates is doubled while keeping the separation constant, what happens to the capacitance?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
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Solution
Capacitance is directly proportional to the area of the plates. Doubling the area will double the capacitance.
Correct Answer: A — It doubles
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Q. In a parallel plate capacitor, if the distance between the plates is doubled while keeping the charge constant, what happens to the electric potential?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
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Solution
The electric potential V is directly proportional to the distance d between the plates, so if d is doubled, V also doubles.
Correct Answer: A — It doubles
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Q. In a parallel plate capacitor, if the distance between the plates is halved, what happens to the capacitance?
A.
It halves
B.
It doubles
C.
It remains the same
D.
It quadruples
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Solution
Capacitance C = ε₀ * A / d. If d is halved, C doubles.
Correct Answer: B — It doubles
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Q. In a parallel RLC circuit, what happens to the total current if the frequency is increased?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Depends on R
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Solution
In a parallel RLC circuit, increasing frequency generally increases the total current due to lower reactance.
Correct Answer: A — Increases
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Q. In a photoelectric effect experiment, increasing the intensity of light increases the number of emitted electrons. What does this imply?
A.
Light is a wave
B.
Light is a particle
C.
Energy of each photon increases
D.
Number of photons increases
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Solution
Increasing the intensity of light increases the number of photons hitting the surface, which in turn increases the number of emitted electrons.
Correct Answer: D — Number of photons increases
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Q. In a photoelectric experiment, if the frequency of light is just above the threshold frequency, what can be said about the emitted electrons?
A.
They have maximum kinetic energy
B.
They are emitted with zero kinetic energy
C.
They are emitted with high kinetic energy
D.
No electrons are emitted
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Solution
If the frequency of light is just above the threshold frequency, the emitted electrons will have zero kinetic energy, as all the energy is used to overcome the work function.
Correct Answer: B — They are emitted with zero kinetic energy
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Q. In a photoelectric experiment, if the stopping potential is increased, what does it indicate about the emitted electrons?
A.
They have higher kinetic energy
B.
They have lower kinetic energy
C.
They are emitted at a lower rate
D.
They are not emitted
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Solution
Increasing the stopping potential indicates that the emitted electrons have higher kinetic energy, as more energy is required to stop them.
Correct Answer: A — They have higher kinetic energy
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Q. In a photoelectric experiment, if the stopping potential is increased, what happens to the current?
A.
It increases
B.
It decreases
C.
It remains constant
D.
It becomes zero
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Solution
Increasing the stopping potential reduces the number of electrons reaching the anode, thus decreasing the current.
Correct Answer: B — It decreases
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Q. In a photoelectric experiment, if the stopping potential is increased, what happens to the energy of the emitted electrons?
A.
It increases
B.
It decreases
C.
It remains the same
D.
It becomes negative
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Solution
The stopping potential does not affect the energy of the emitted electrons; it only affects the number of electrons reaching the detector.
Correct Answer: C — It remains the same
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