Q. If a machine does 200 J of work in 5 seconds, what is its power? (2022)
A.
40 W
B.
50 W
C.
20 W
D.
30 W
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Solution
Power (P) = Work Done (W) / Time (t) = 200 J / 5 s = 40 W
Correct Answer:
B
— 50 W
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Q. If a machine does 2000 J of work in 5 seconds, what is its power? (2022)
A.
400 W
B.
200 W
C.
100 W
D.
500 W
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Solution
Power (P) = Work Done / Time = 2000 J / 5 s = 400 W
Correct Answer:
A
— 400 W
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Q. If a material has a high shear modulus, what does it indicate about the material? (2023)
A.
It is very elastic
B.
It is very ductile
C.
It resists shear deformation
D.
It is very brittle
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Solution
A high shear modulus indicates that the material resists shear deformation.
Correct Answer:
C
— It resists shear deformation
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Q. If a material has a shear modulus of 80 GPa and a shear stress of 40 MPa is applied, what is the shear strain? (2023)
A.
0.0005
B.
0.005
C.
0.5
D.
0.05
Show solution
Solution
Shear strain (γ) = Shear stress (τ) / Shear modulus (G) = 40 MPa / 80 GPa = 0.0005.
Correct Answer:
A
— 0.0005
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Q. If a measurement has a relative error of 5%, what does this indicate? (2022)
A.
The measurement is very accurate
B.
The measurement is very precise
C.
The measurement is off by 5% of the true value
D.
The measurement is exact
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Solution
A relative error of 5% indicates that the measurement is off by 5% of the true value.
Correct Answer:
C
— The measurement is off by 5% of the true value
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Q. If a measurement is accurate but not precise, what does it imply? (2019)
A.
All measurements are close to each other
B.
Measurements are close to the true value
C.
Measurements vary widely
D.
None of the above
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Solution
Accuracy refers to how close a measurement is to the true value.
Correct Answer:
B
— Measurements are close to the true value
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Q. If a measurement is accurate, it means: (2019)
A.
It is close to the true value
B.
It is consistent
C.
It has a small error
D.
It is precise
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Solution
Accuracy refers to how close a measured value is to the true value.
Correct Answer:
A
— It is close to the true value
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Q. If a measurement is said to have a precision of 0.01 cm, what does this imply? (2019)
A.
The measurement is accurate to 0.01 cm
B.
The measurement can vary by 0.01 cm
C.
The measurement is exact
D.
The measurement is rounded to 0.01 cm
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Solution
A precision of 0.01 cm implies that the measurement can vary by this amount, indicating the level of uncertainty.
Correct Answer:
B
— The measurement can vary by 0.01 cm
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Q. If a resistor has a current of 2A flowing through it and a voltage of 10V across it, what is the resistance? (2023)
A.
2Ω
B.
5Ω
C.
10Ω
D.
20Ω
Show solution
Solution
Using Ohm's Law, R = V / I = 10V / 2A = 5Ω.
Correct Answer:
B
— 5Ω
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Q. If a resistor has a resistance of 10Ω and a current of 2A flows through it, what is the voltage across the resistor? (2023)
A.
5V
B.
10V
C.
20V
D.
30V
Show solution
Solution
Using Ohm's Law, V = I * R = 2A * 10Ω = 20V.
Correct Answer:
C
— 20V
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Q. If a resistor has a resistance of 10Ω and a current of 5A flows through it, what is the voltage across the resistor? (2023)
A.
10V
B.
20V
C.
30V
D.
50V
Show solution
Solution
Using Ohm's Law, V = I * R = 5A * 10Ω = 50V.
Correct Answer:
B
— 20V
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Q. If a resistor has a resistance of 8Ω and the current flowing through it is 4A, what is the power dissipated by the resistor? (2022)
A.
16W
B.
32W
C.
64W
D.
8W
Show solution
Solution
Power (P) can be calculated using P = I^2 * R = (4A)^2 * 8Ω = 16 * 8 = 128W.
Correct Answer:
B
— 32W
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Q. If a resistor has a resistance of 8Ω and the current flowing through it is 4A, what is the voltage across the resistor? (2022)
A.
32V
B.
16V
C.
8V
D.
4V
Show solution
Solution
Using Ohm's Law, V = I * R = 4A * 8Ω = 32V.
Correct Answer:
B
— 16V
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Q. If a ruler has a least count of 0.1 cm, what is the maximum error in measurement? (2023)
A.
0.05 cm
B.
0.1 cm
C.
0.2 cm
D.
0.01 cm
Show solution
Solution
The maximum error is typically taken as the least count of the measuring instrument, which is 0.1 cm.
Correct Answer:
B
— 0.1 cm
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Q. If a ruler has a least count of 0.1 cm, what is the smallest measurement it can accurately provide? (2023)
A.
0.1 cm
B.
0.05 cm
C.
0.01 cm
D.
1 cm
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Solution
The least count of a measuring instrument is the smallest value that can be measured accurately, which in this case is 0.1 cm.
Correct Answer:
A
— 0.1 cm
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Q. If a thin film of oil on water produces a green color due to interference, what can be inferred about the thickness of the film? (2023)
A.
It is very thick
B.
It is very thin
C.
It is of variable thickness
D.
It is equal to the wavelength of green light
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Solution
Thin films produce colors due to interference; a green color indicates a thin film where the thickness is comparable to the wavelength of visible light.
Correct Answer:
B
— It is very thin
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Q. If a torque of 10 Nm is applied to a body with a moment of inertia of 2 kg·m², what is the angular acceleration? (2022)
A.
5 rad/s²
B.
10 rad/s²
C.
2 rad/s²
D.
20 rad/s²
Show solution
Solution
Using the formula τ = Iα, we have α = τ/I = 10 Nm / 2 kg·m² = 5 rad/s².
Correct Answer:
A
— 5 rad/s²
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Q. If a trait is controlled by multiple alleles, what is this phenomenon called? (2022)
A.
Polygenic inheritance
B.
Multiple alleles
C.
Incomplete dominance
D.
Codominance
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Solution
When a trait is controlled by multiple alleles, it is referred to as multiple alleles.
Correct Answer:
B
— Multiple alleles
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Q. If a wave has a frequency of 50 Hz and a wavelength of 3 m, what is its speed? (2019)
A.
150 m/s
B.
100 m/s
C.
50 m/s
D.
200 m/s
Show solution
Solution
Wave speed (v) can be calculated using the formula v = fλ. Here, v = 50 Hz * 3 m = 150 m/s.
Correct Answer:
B
— 100 m/s
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Q. If a wave has a frequency of 50 Hz and a wavelength of 4 m, what is its speed? (2019)
A.
100 m/s
B.
200 m/s
C.
50 m/s
D.
25 m/s
Show solution
Solution
The speed of a wave can be calculated using the formula v = f × λ. Here, v = 50 Hz × 4 m = 200 m/s.
Correct Answer:
A
— 100 m/s
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Q. If a wave has a speed of 300 m/s and a frequency of 150 Hz, what is its wavelength? (2023)
A.
1 m
B.
2 m
C.
3 m
D.
4 m
Show solution
Solution
Using the wave equation v = fλ, we can rearrange it to find λ = v/f. Thus, λ = 300 m/s / 150 Hz = 2 m.
Correct Answer:
B
— 2 m
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Q. If the amplitude of a simple harmonic motion is doubled, what happens to the total energy of the system? (2022)
A.
It remains the same
B.
It doubles
C.
It quadruples
D.
It halves
Show solution
Solution
Total energy (E) in SHM is proportional to the square of the amplitude (A). If A is doubled, E becomes 4A^2, hence it quadruples.
Correct Answer:
C
— It quadruples
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Q. If the amplitude of a wave is increased, what effect does it have on the energy carried by the wave? (2019)
A.
Energy decreases
B.
Energy remains the same
C.
Energy increases
D.
Energy becomes zero
Show solution
Solution
The energy carried by a wave is proportional to the square of its amplitude. Therefore, if the amplitude increases, the energy also increases.
Correct Answer:
C
— Energy increases
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Q. If the amplitude of a wave is increased, what effect does it have on the energy of the wave? (2022)
A.
Energy decreases
B.
Energy remains the same
C.
Energy increases
D.
Energy becomes zero
Show solution
Solution
The energy of a wave is proportional to the square of its amplitude. Therefore, if the amplitude increases, the energy also increases.
Correct Answer:
C
— Energy increases
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Q. If the amplitude of a wave is increased, what happens to its energy? (2019)
A.
Decreases
B.
Increases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
The energy of a wave is proportional to the square of its amplitude. Therefore, if the amplitude increases, the energy also increases.
Correct Answer:
B
— Increases
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Q. If the amplitude of a wave is tripled, what happens to the energy carried by the wave? (2019)
A.
It remains the same
B.
It doubles
C.
It triples
D.
It increases by a factor of nine
Show solution
Solution
The energy carried by a wave is proportional to the square of the amplitude. Therefore, if the amplitude is tripled, the energy increases by a factor of 3^2 = 9.
Correct Answer:
D
— It increases by a factor of nine
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Q. If the angular momentum of a system is conserved, what can be said about the net external torque acting on the system? (2023)
A.
It is zero
B.
It is constant
C.
It is maximum
D.
It is minimum
Show solution
Solution
If angular momentum is conserved, it implies that the net external torque acting on the system is zero.
Correct Answer:
A
— It is zero
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Q. If the capacitance of a capacitor is doubled while keeping the charge constant, what happens to the potential difference across it? (2020)
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
Show solution
Solution
Capacitance C is defined as C = Q/V. If C is doubled and Q remains constant, then V must halve to maintain the equation.
Correct Answer:
B
— It halves
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Q. If the capacitance of a parallel plate capacitor is C, what will be the capacitance if the distance between the plates is doubled? (2020)
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Solution
The capacitance C of a parallel plate capacitor is given by C = εA/d. If the distance d is doubled, the new capacitance will be C/2.
Correct Answer:
A
— C/2
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Q. If the charge on a capacitor is doubled while keeping the voltage constant, what happens to the capacitance? (2022)
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
Show solution
Solution
Capacitance C = Q/V. If Q is doubled and V remains constant, C must also double.
Correct Answer:
A
— It doubles
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