Q. If a force of 10 N is applied to a mass of 2 kg, what is the acceleration of the mass? (2020)
A.
2 m/s²
B.
5 m/s²
C.
10 m/s²
D.
20 m/s²
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Solution
Using F = ma, acceleration a = F/m = 10 N / 2 kg = 5 m/s².
Correct Answer:
B
— 5 m/s²
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Q. If a force of 10 N is applied to move an object 3 m in the direction of the force, what is the work done?
A.
30 J
B.
10 J
C.
3 J
D.
0 J
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Solution
Work done = Force * Distance = 10 N * 3 m = 30 J.
Correct Answer:
A
— 30 J
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Q. If a force of 15 N is applied to a 3 kg object, what is the net force acting on the object if it is already moving with a velocity of 5 m/s? (2022)
A.
15 N
B.
3 N
C.
0 N
D.
18 N
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Solution
The net force is still 15 N as it does not depend on the velocity of the object.
Correct Answer:
A
— 15 N
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Q. If a force of 15 N is applied to a mass of 3 kg, what is the acceleration of the mass? (2023)
A.
3 m/s²
B.
4 m/s²
C.
5 m/s²
D.
6 m/s²
Show solution
Solution
Using F = ma, a = F/m = 15 N / 3 kg = 5 m/s².
Correct Answer:
B
— 4 m/s²
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Q. If a force of 15 N moves an object 3 m in the direction of the force, what is the work done? (2022)
A.
45 J
B.
30 J
C.
60 J
D.
15 J
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Solution
Work done = Force × Distance = 15 N × 3 m = 45 J
Correct Answer:
A
— 45 J
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Q. If a force of 20 N moves an object 5 m in the direction of the force, what is the work done?
A.
100 J
B.
50 J
C.
20 J
D.
200 J
Show solution
Solution
Work = Force * Distance = 20 N * 5 m = 100 J.
Correct Answer:
A
— 100 J
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Q. If a machine does 3000 J of work in 10 seconds, what is its power output?
A.
300 W
B.
150 W
C.
600 W
D.
1000 W
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Solution
Power (P) = Work (W) / Time (t) = 3000 J / 10 s = 300 W.
Correct Answer:
A
— 300 W
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Q. If a machine has a power output of 200 W, how much work can it do in 5 seconds? (2000)
A.
500 J
B.
1000 J
C.
1500 J
D.
2000 J
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Solution
Work done (W) = Power (P) × Time (t) = 200 W × 5 s = 1000 J.
Correct Answer:
B
— 1000 J
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Q. If a magnetic field is increasing at a rate of 0.1 T/s, what is the induced EMF in a coil of 50 turns and area 0.2 m²? (2021)
A.
1 V
B.
0.5 V
C.
0.2 V
D.
0.1 V
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Solution
Induced EMF (ε) = -N * (dB/dt) * A = -50 * 0.1 T/s * 0.2 m² = -1 V.
Correct Answer:
A
— 1 V
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Q. If a person does 200 J of work in 5 seconds, what is their power output?
A.
40 W
B.
50 W
C.
60 W
D.
30 W
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Solution
Power (P) = Work (W) / Time (t) = 200 J / 5 s = 40 W.
Correct Answer:
B
— 50 W
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Q. If a person does 300 J of work in 15 seconds, what is their average power output?
A.
20 W
B.
15 W
C.
25 W
D.
30 W
Show solution
Solution
Power = Work / Time = 300 J / 15 s = 20 W
Correct Answer:
A
— 20 W
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Q. If a person does 300 J of work in 15 seconds, what is their power output?
A.
20 W
B.
15 W
C.
25 W
D.
30 W
Show solution
Solution
Power = Work / Time = 300 J / 15 s = 20 W
Correct Answer:
A
— 20 W
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Q. If a person does 500 J of work in 5 seconds, what is their power output?
A.
100 W
B.
50 W
C.
200 W
D.
150 W
Show solution
Solution
Power (P) = Work (W) / Time (t) = 500 J / 5 s = 100 W.
Correct Answer:
A
— 100 W
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Q. If a person lifts a 20 kg box to a height of 2 m, what is the work done against gravity? (g = 9.8 m/s²)
A.
392 J
B.
196 J
C.
588 J
D.
784 J
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Solution
Work = m * g * h = 20 kg * 9.8 m/s² * 2 m = 392 J.
Correct Answer:
B
— 196 J
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Q. If a physical quantity has dimensions [M^0 L^1 T^-1], what is it? (2020)
A.
Velocity
B.
Acceleration
C.
Force
D.
Energy
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Solution
The dimensions [M^0 L^1 T^-1] correspond to velocity, which is defined as distance traveled per unit time.
Correct Answer:
A
— Velocity
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Q. If a physical quantity has dimensions [M^2 L^3 T^-1], what could it represent? (2020)
A.
Force
B.
Pressure
C.
Volume flow rate
D.
Energy
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Solution
The dimensions [M^2 L^3 T^-1] correspond to volume flow rate, which is volume per unit time.
Correct Answer:
C
— Volume flow rate
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Q. If a vehicle accelerates from 0 to 60 m/s in 12 seconds, what is its acceleration?
A.
2 m/s²
B.
4 m/s²
C.
5 m/s²
D.
6 m/s²
Show solution
Solution
Using the formula: a = (v - u) / t = (60 - 0) / 12 = 5 m/s².
Correct Answer:
B
— 4 m/s²
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Q. If a wave has a frequency of 50 Hz and a wavelength of 2 m, what is its speed? (2018)
A.
100 m/s
B.
50 m/s
C.
25 m/s
D.
200 m/s
Show solution
Solution
Wave speed = frequency × wavelength = 50 Hz × 2 m = 100 m/s.
Correct Answer:
A
— 100 m/s
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Q. If a wave has a frequency of 50 Hz, what is its period? (2022)
A.
0.02 s
B.
0.5 s
C.
2 s
D.
20 s
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Solution
Period (T) = 1/Frequency = 1/50 Hz = 0.02 s.
Correct Answer:
A
— 0.02 s
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Q. If the amplitude of a simple harmonic oscillator is increased, what happens to its total energy? (2021)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
The total energy (E) in a simple harmonic oscillator is given by E = (1/2)kA². If amplitude (A) increases, energy increases.
Correct Answer:
A
— Increases
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Q. If the amplitude of a simple harmonic oscillator is tripled, how does the total energy change? (2020)
A.
Increases by 3 times
B.
Increases by 6 times
C.
Increases by 9 times
D.
Remains the same
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Solution
Total energy in SHM is proportional to the square of the amplitude. If amplitude is tripled, energy increases by 3^2 = 9 times.
Correct Answer:
C
— Increases by 9 times
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Q. If the amplitude of a wave is doubled, how does it affect the energy of the wave? (2020)
A.
Remains the same
B.
Doubles
C.
Increases by four times
D.
Halves
Show solution
Solution
Energy of a wave is proportional to the square of the amplitude. If amplitude is doubled, energy increases by (2^2) = 4 times.
Correct Answer:
C
— Increases by four times
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Q. If the amplitude of a wave is doubled, how does this affect the energy carried by the wave? (2021)
A.
Energy is halved
B.
Energy remains the same
C.
Energy is doubled
D.
Energy is quadrupled
Show solution
Solution
The energy carried by a wave is proportional to the square of the amplitude. Therefore, if the amplitude is doubled, the energy increases by a factor of four.
Correct Answer:
D
— Energy is quadrupled
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Q. If the area of a coil is doubled while keeping the magnetic field constant, what happens to the magnetic flux through the coil? (2023)
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
Show solution
Solution
Magnetic flux (Φ) is given by the product of magnetic field (B) and area (A). If the area is doubled and the magnetic field remains constant, the magnetic flux also doubles.
Correct Answer:
A
— It doubles
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Q. If the area of a loop in a magnetic field is doubled while keeping the magnetic field strength constant, what happens to the magnetic flux through the loop?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
Show solution
Solution
Magnetic flux (Φ) is given by Φ = B * A. If the area (A) is doubled and the magnetic field (B) remains constant, the magnetic flux also doubles.
Correct Answer:
A
— It doubles
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Q. If the capacitance in an AC circuit is increased, what happens to the capacitive reactance? (2023)
A.
It increases
B.
It decreases
C.
It remains the same
D.
It becomes zero
Show solution
Solution
Capacitive reactance XC = 1/(ωC). If capacitance C increases, XC decreases.
Correct Answer:
B
— It decreases
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Q. If the charge on a capacitor is doubled, what happens to the energy stored? (2019)
A.
It remains the same
B.
It doubles
C.
It quadruples
D.
It halves
Show solution
Solution
The energy stored in a capacitor is proportional to the square of the charge (U = Q^2/(2C)). Doubling the charge increases the energy by a factor of 4.
Correct Answer:
C
— It quadruples
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Q. If the current in an AC circuit is given by I(t) = I0 cos(ωt), what is the RMS current? (2023)
A.
I0/√2
B.
I0
C.
2I0
D.
I0/2
Show solution
Solution
RMS current I_rms = I0/√2 for a cosine function.
Correct Answer:
A
— I0/√2
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Q. If the current in an AC circuit is I(t) = 5√2 sin(100t + π/4), what is the RMS current? (2021)
A.
5 A
B.
2.5 A
C.
7.07 A
D.
3.54 A
Show solution
Solution
The RMS current is I_rms = I_peak / √2 = 5√2 / √2 = 5 A.
Correct Answer:
B
— 2.5 A
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Q. If the current through a resistor is tripled, what happens to the power dissipated in the resistor? (2022)
A.
Increases by 3 times
B.
Increases by 9 times
C.
Remains the same
D.
Decreases by 3 times
Show solution
Solution
Power is proportional to the square of the current (P = I²R). If I is tripled, P increases by 3² = 9 times.
Correct Answer:
B
— Increases by 9 times
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