Q. In a lottery, there are 10 tickets, and 3 are winning tickets. What is the probability of picking a winning ticket? (2022)
A.
1/3
B.
1/4
C.
1/5
D.
1/2
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Solution
Probability = Number of winning tickets / Total tickets = 3/10.
Correct Answer:
A
— 1/3
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Q. In a lottery, there are 100 tickets and 10 winning tickets. What is the probability of picking a winning ticket? (2023)
A.
1/10
B.
1/5
C.
1/20
D.
1/50
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Solution
Probability of winning = 10/100 = 1/10.
Correct Answer:
A
— 1/10
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Q. In a magnetic field, the force on a charged particle is maximum when the angle between the velocity and the magnetic field is: (2019)
A.
0 degrees
B.
90 degrees
C.
180 degrees
D.
45 degrees
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Solution
The force on a charged particle in a magnetic field is maximum when the angle between the velocity and the magnetic field is 90 degrees.
Correct Answer:
B
— 90 degrees
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Q. In a measurement, if the error is systematic, what can be said about the results? (2020)
A.
They are random
B.
They are biased
C.
They are accurate
D.
They are precise
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Solution
Systematic errors lead to biased results, consistently deviating from the true value.
Correct Answer:
B
— They are biased
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Q. In a measurement, if the error is systematic, what does it indicate? (2020)
A.
Random fluctuations
B.
Consistent bias
C.
Human error
D.
Instrument malfunction
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Solution
Systematic errors indicate a consistent bias in measurements.
Correct Answer:
B
— Consistent bias
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Q. In a measurement, if the precision is high, it means: (2019)
A.
The measurements are close to the true value
B.
The measurements are consistent with each other
C.
The measurements have low uncertainty
D.
The measurements are accurate
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Solution
High precision indicates that repeated measurements yield similar results.
Correct Answer:
B
— The measurements are consistent with each other
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Q. In a measurement, if the systematic error is known, how can it be corrected? (2020)
A.
By averaging multiple readings
B.
By subtracting the error from the measured value
C.
By ignoring the error
D.
By taking more measurements
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Solution
Systematic errors can be corrected by subtracting the known error from the measured value.
Correct Answer:
B
— By subtracting the error from the measured value
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Q. In a measurement, if the uncertainty is ±0.1 g, what does it indicate? (2023)
A.
The measurement is exact
B.
The measurement can vary by 0.1 g
C.
The measurement is inaccurate
D.
The measurement is precise
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Solution
An uncertainty of ±0.1 g indicates that the measurement can vary by 0.1 g from the reported value.
Correct Answer:
B
— The measurement can vary by 0.1 g
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Q. In a measurement, if the uncertainty is ±0.5 cm, what is the range of the measurement 10.0 cm? (2023)
A.
9.5 cm to 10.5 cm
B.
9.0 cm to 11.0 cm
C.
10.0 cm to 10.5 cm
D.
10.0 cm to 11.0 cm
Show solution
Solution
The range is calculated as (10.0 - 0.5) cm to (10.0 + 0.5) cm, which is 9.5 cm to 10.5 cm.
Correct Answer:
A
— 9.5 cm to 10.5 cm
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Q. In a measurement, if the value is reported as 3.00 kg, how many significant figures are there? (2019)
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Solution
The number 3.00 kg has three significant figures.
Correct Answer:
B
— 3
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Q. In a Michelson interferometer, what happens to the fringe pattern if one of the mirrors is moved away from the beam splitter? (2020)
A.
Fringe pattern moves to the left
B.
Fringe pattern moves to the right
C.
Fringe pattern disappears
D.
Fringe pattern becomes brighter
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Solution
Moving one mirror changes the path length, causing the fringe pattern to shift to the right.
Correct Answer:
B
— Fringe pattern moves to the right
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Q. In a Newton's ring experiment, if the radius of the first dark ring is found to be r, what is the radius of the second dark ring? (2020)
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Solution
The radius of the dark rings in Newton's rings is proportional to the square root of the ring number. Thus, the second dark ring will have a radius of 2r.
Correct Answer:
B
— 2r
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Q. In a Newton's rings experiment, if the radius of the nth dark ring is r_n, what is the relationship between r_n and the wavelength λ? (2021)
A.
r_n ∝ nλ
B.
r_n ∝ √nλ
C.
r_n ∝ n²λ
D.
r_n ∝ n/λ
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Solution
The radius of the dark rings in Newton's rings is given by r_n² = nλR, where R is the radius of curvature of the lens. Thus, r_n ∝ nλ.
Correct Answer:
C
— r_n ∝ n²λ
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Q. In a nuclear reaction, if a nucleus emits an alpha particle, what happens to its atomic number? (2023)
A.
It increases by 2
B.
It decreases by 2
C.
It remains the same
D.
It decreases by 4
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Solution
An alpha particle consists of 2 protons and 2 neutrons, so the atomic number decreases by 2.
Correct Answer:
B
— It decreases by 2
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Q. In a p-n junction, what happens when the junction is forward biased? (2019)
A.
Depletion region widens
B.
Depletion region narrows
C.
No current flows
D.
Reverse current increases
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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, which type of charge carriers are majority carriers in the p-type region? (2019)
A.
Electrons
B.
Holes
C.
Protons
D.
Neutrons
Show solution
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)
A.
Electrons
B.
Holes
C.
Protons
D.
Neutrons
Show solution
Solution
In a p-type region, holes are the predominant charge carriers.
Correct Answer:
B
— Holes
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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)
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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 12Ω, what is the total current if the voltage across the circuit is 24V? (2022)
Show solution
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 6Ω and 3Ω, what is the total current if a 12V battery is connected? (2021)
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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
Show solution
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)
Show solution
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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Q. In a parallel circuit, if one branch has a resistance of 4Ω and another has 8Ω, what is the equivalent resistance? (2020)
A.
2.67Ω
B.
3Ω
C.
4Ω
D.
6Ω
Show solution
Solution
1/R_eq = 1/4 + 1/8 = 2/8 + 1/8 = 3/8, so R_eq = 8/3Ω ≈ 2.67Ω.
Correct Answer:
A
— 2.67Ω
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Q. In a parallel plate capacitor, if the distance between the plates is increased, what happens to the capacitance? (2022)
A.
It increases
B.
It decreases
C.
It remains the same
D.
It becomes zero
Show solution
Solution
The capacitance (C) of a parallel plate capacitor is inversely proportional to the distance (d) between the plates. If d increases, C decreases.
Correct Answer:
B
— It decreases
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Q. In a parallel RLC circuit, if R = 50 ohms, L = 0.2H, and C = 50μF, what is the total admittance? (2023)
A.
0.02 S
B.
0.04 S
C.
0.06 S
D.
0.08 S
Show solution
Solution
Y = 1/R + j(ωC - 1/ωL); calculate Y for given values.
Correct Answer:
C
— 0.06 S
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Q. In a parallel RLC circuit, if R = 50Ω, L = 0.2 H, and C = 50μF, what is the quality factor Q? (2015)
Show solution
Solution
Quality factor Q = (1/R) * √(L/C) = (1/50) * √(0.2/50e-6) = 2.
Correct Answer:
B
— 2
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Q. In a parallel RLC circuit, if the resistance is 10Ω, inductance is 0.2H, and capacitance is 50μF, what is the total current at resonance? (2022)
A.
0.5A
B.
1A
C.
2A
D.
4A
Show solution
Solution
At resonance, total current I = V/R. Calculate using V = 10V.
Correct Answer:
B
— 1A
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Q. In a parallel RLC circuit, if the resistance is 10Ω, inductance is 0.2H, and capacitance is 50μF, what is the quality factor Q? (2021)
Show solution
Solution
Quality factor Q = (1/R) * √(L/C) = (1/10) * √(0.2/50e-6) ≈ 3.
Correct Answer:
C
— 3
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Q. In a parallel RLC circuit, if the resistance is 10Ω, inductance is 0.2H, and capacitance is 50μF, what is the total admittance? (2022)
A.
0.1 S
B.
0.2 S
C.
0.3 S
D.
0.4 S
Show solution
Solution
Total admittance Y = 1/R + j(ωC - 1/ωL). Calculate Y using given values.
Correct Answer:
C
— 0.3 S
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Q. In a pedigree chart, a filled circle represents which of the following? (2023)
A.
Male
B.
Female
C.
Affected female
D.
Affected male
Show solution
Solution
In a pedigree chart, a filled circle represents an affected female.
Correct Answer:
C
— Affected female
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