Q. In a nuclear reaction, what is conserved?
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A.
Mass only
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B.
Charge only
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C.
Mass and charge
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D.
Energy only
Solution
In nuclear reactions, both mass and charge are conserved, according to the law of conservation of mass-energy and charge.
Correct Answer: C — Mass and charge
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Q. In a nuclear reaction, what is the term for the energy released when a nucleus is formed from its constituent nucleons?
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A.
Binding energy
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B.
Kinetic energy
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C.
Potential energy
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D.
Thermal energy
Solution
The energy released when a nucleus is formed from its constituent nucleons is called binding energy.
Correct Answer: A — Binding energy
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Q. In a nuclear reaction, what is the term for the energy released?
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A.
Kinetic energy
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B.
Potential energy
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C.
Binding energy
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D.
Nuclear energy
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?
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A.
Mass defect
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B.
Binding energy
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C.
Nuclear fusion
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D.
Nuclear fission
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 number system where 'A' represents 10, 'B' represents 11, and 'C' represents 12, what is the decimal equivalent of 'BAC'?
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A.
186
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B.
187
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C.
188
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D.
189
Solution
'BAC' = 11*16^2 + 10*16^1 + 12*16^0 = 186 + 10 + 12 = 188.
Correct Answer: B — 187
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Q. In a p-n junction diode, what happens when it is forward biased?
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A.
Depletion region widens
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B.
Current flows easily
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C.
No current flows
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D.
Reverse breakdown occurs
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?
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A.
Current flows freely
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B.
Depletion region widens
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C.
Holes move towards the n-side
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D.
Electrons move towards the p-side
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 happens when the junction is forward biased? (2019)
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A.
Depletion region widens
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B.
Depletion region narrows
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C.
No current flows
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D.
Reverse current increases
Solution
When a p-n junction is forward biased, the depletion region narrows, allowing current to flow.
Correct Answer: B — Depletion region narrows
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Q. In a p-n junction, what is formed at the junction region?
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A.
Electric field
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B.
Magnetic field
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C.
Thermal field
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D.
Gravitational field
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?
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A.
Depletion region
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B.
Conduction band
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C.
Valence band
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D.
Neutral zone
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?
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A.
Depletion region
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B.
Conduction band
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C.
Valence band
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D.
Neutral zone
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 p-n junction, which type of charge carriers are majority carriers in the p-type region? (2019)
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A.
Electrons
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B.
Holes
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C.
Protons
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D.
Neutrons
Solution
In the p-type region of a p-n junction, holes are the majority charge carriers.
Correct Answer: B — Holes
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Q. In a p-n junction, which type of charge carriers are predominant in the p-type region? (2019)
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A.
Electrons
-
B.
Holes
-
C.
Protons
-
D.
Neutrons
Solution
In a p-type region, holes are the predominant charge carriers.
Correct Answer: B — Holes
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Q. In a pair of vertically opposite angles, if one angle measures 120 degrees, what is the measure of the other angle? (2021)
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A.
60 degrees
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B.
120 degrees
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C.
180 degrees
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D.
90 degrees
Solution
Vertically opposite angles are equal. Therefore, if one angle measures 120 degrees, the other angle also measures 120 degrees.
Correct Answer: B — 120 degrees
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Q. In a parallel circuit with three resistors of 2Ω, 3Ω, and 6Ω, what is the equivalent resistance?
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?
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A.
3 ohms
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B.
4 ohms
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C.
2 ohms
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D.
1 ohm
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?
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?
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A.
1.5 ohms
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B.
2 ohms
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C.
2.5 ohms
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D.
3 ohms
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?
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?
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A.
2.4 ohms
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B.
10 ohms
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C.
24 ohms
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D.
12 ohms
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?
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A.
2 A
-
B.
3 A
-
C.
4 A
-
D.
5 A
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
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 12Ω, what is the total current if the voltage across the circuit is 24V? (2022)
Solution
First, find the equivalent resistance: 1/R_eq = 1/4 + 1/12 = 3/12 + 1/12 = 4/12, R_eq = 3Ω. Then, I = V/R_eq = 24V / 3Ω = 8A.
Correct Answer: C — 8A
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Q. In a parallel circuit with two resistors of 4Ω and 12Ω, what is the total current if the voltage across them is 24V? (2022)
Solution
Total current I = V/R_eq. First, find R_eq = 1/(1/4 + 1/12) = 3Ω. Then, I = 24V / 3Ω = 8A.
Correct Answer: A — 6A
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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?
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?
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A.
2 ohms
-
B.
4 ohms
-
C.
1.5 ohms
-
D.
9 ohms
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 of 6 ohms and 3 ohms, what is the total resistance?
-
A.
2 ohms
-
B.
4 ohms
-
C.
1.5 ohms
-
D.
9 ohms
Solution
The total resistance in parallel is given by 1/R_total = 1/R1 + 1/R2. Thus, 1/R_total = 1/6 + 1/3 = 1/2, so R_total = 2 ohms.
Correct Answer: A — 2 ohms
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Q. In a parallel circuit with two resistors of 6Ω and 3Ω, what is the total current if a 12V battery is connected? (2021)
Solution
First, find the equivalent resistance: 1/R_eq = 1/6 + 1/3 = 1/2, so R_eq = 2Ω. Then, I = V/R_eq = 12V / 2Ω = 6A.
Correct Answer: C — 6A
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Q. In a parallel circuit with two resistors of 6Ω and 3Ω, what is the total resistance? (2019)
-
A.
2Ω
-
B.
4Ω
-
C.
1.5Ω
-
D.
9Ω
Solution
Using the formula 1/R_eq = 1/R1 + 1/R2, we get 1/R_eq = 1/6 + 1/3 = 1/6 + 2/6 = 3/6, thus R_eq = 2Ω.
Correct Answer: B — 4Ω
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Q. In a parallel circuit with two resistors of 8Ω and 4Ω, what is the total current if the voltage across the circuit is 16V? (2022)
Solution
First, find the equivalent resistance: 1/R_eq = 1/8 + 1/4 = 1/8 + 2/8 = 3/8, so R_eq = 8/3Ω. Then, I = V/R_eq = 16V / (8/3)Ω = 16 * 3/8 = 6A.
Correct Answer: D — 8A
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