Physics
Q. What is the potential energy of an object of mass 2 kg at a height of 5 m? (g = 9.8 m/s²) (2019)
A.
98 J
B.
100 J
C.
90 J
D.
80 J
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Solution
Potential Energy (PE) = mgh = 2 kg × 9.8 m/s² × 5 m = 98 J.
Correct Answer: A — 98 J
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Q. What is the potential energy of an object of mass 2 kg at a height of 5 m? (g = 10 m/s²) (2018)
A.
100 J
B.
50 J
C.
20 J
D.
10 J
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Solution
Potential Energy (PE) = mgh = 2 kg × 10 m/s² × 5 m = 100 J.
Correct Answer: A — 100 J
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Q. What is the power consumed by a 6Ω resistor when a current of 2A flows through it? (2023)
A.
12W
B.
24W
C.
6W
D.
8W
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Solution
Power (P) is given by P = I²R = (2A)² * 6Ω = 4 * 6 = 24W.
Correct Answer: A — 12W
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Q. What is the power consumed in an AC circuit with a voltage of 230V and a current of 5A with a power factor of 0.8? (2023)
A.
920W
B.
1150W
C.
115W
D.
460W
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Solution
Power = V × I × Power Factor = 230V × 5A × 0.8 = 920W.
Correct Answer: A — 920W
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Q. What is the power factor in a circuit with a resistance of 5 ohms and a reactance of 5 ohms? (2022)
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Solution
Power factor = R/Z = 5/√(5² + 5²) = 5/√50 = √2/2.
Correct Answer: D — √2/2
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Q. What is the power factor of a circuit with a resistance of 5Ω and an inductive reactance of 5Ω? (2022)
A.
0.5
B.
0.707
C.
1
D.
0
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Solution
Power factor = R/Z = 5 / √(5² + 5²) = 5 / √50 = 0.707.
Correct Answer: B — 0.707
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Q. What is the power factor of an AC circuit with a phase angle of 60°? (2022)
A.
0.5
B.
0.866
C.
1
D.
0.707
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Solution
The power factor is cos(60°) = 0.5.
Correct Answer: B — 0.866
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Q. What is the power output of a motor that does 1200 J of work in 30 seconds?
A.
20 W
B.
40 W
C.
60 W
D.
80 W
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Solution
Power = Work / Time = 1200 J / 30 s = 40 W.
Correct Answer: C — 60 W
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Q. What is the power output of a motor that does 3000 J of work in 15 seconds?
A.
200 W
B.
300 W
C.
400 W
D.
500 W
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Solution
Power = Work / Time = 3000 J / 15 s = 200 W.
Correct Answer: B — 300 W
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Q. What is the pressure exerted by a force of 100 N over an area of 5 m²? (2023)
A.
20 Pa
B.
25 Pa
C.
15 Pa
D.
30 Pa
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Solution
Pressure (P) = Force/Area = 100 N / 5 m² = 20 Pa.
Correct Answer: B — 25 Pa
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Q. What is the pressure exerted by a force of 200 N acting on an area of 4 m²? (2015)
A.
50 Pa
B.
100 Pa
C.
200 Pa
D.
400 Pa
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Solution
Pressure = Force/Area = 200 N / 4 m² = 50 Pa.
Correct Answer: B — 100 Pa
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Q. What is the relationship between the frequency and the period of a wave? (2021)
A.
Frequency is the square of the period
B.
Period is the reciprocal of frequency
C.
Frequency and period are unrelated
D.
Period is the square root of frequency
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Solution
The period T is the reciprocal of frequency f, given by T = 1/f.
Correct Answer: B — Period is the reciprocal of frequency
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Q. What is the SI unit of electric charge? (2020)
A.
Coulomb
B.
Ampere
C.
Volt
D.
Ohm
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Solution
The SI unit of electric charge is Coulomb (C).
Correct Answer: A — Coulomb
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Q. What is the specific heat capacity of a substance if it requires 500 J to raise the temperature of 2 kg of the substance by 5°C? (2021)
A.
20 J/kg°C
B.
50 J/kg°C
C.
100 J/kg°C
D.
200 J/kg°C
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Solution
Specific heat capacity (c) = Q / (m * ΔT) = 500 J / (2 kg * 5°C) = 50 J/kg°C.
Correct Answer: B — 50 J/kg°C
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Q. What is the specific heat capacity of water if it takes 4200 J to raise the temperature of 1 kg of water by 1°C? (2021)
A.
2100 J/kg°C
B.
4200 J/kg°C
C.
8400 J/kg°C
D.
1000 J/kg°C
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Solution
The specific heat capacity of water is defined as the amount of heat required to raise the temperature of 1 kg of water by 1°C, which is given as 4200 J/kg°C.
Correct Answer: B — 4200 J/kg°C
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Q. What is the speed of light in vacuum? (2020)
A.
3 x 10^8 m/s
B.
3 x 10^6 m/s
C.
3 x 10^7 m/s
D.
3 x 10^9 m/s
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Solution
The speed of light in vacuum is approximately 3 x 10^8 m/s.
Correct Answer: A — 3 x 10^8 m/s
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Q. What is the temperature in Celsius if the temperature in Kelvin is 273 K?
A.
0°C
B.
100°C
C.
-273°C
D.
273°C
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Solution
To convert Kelvin to Celsius, use the formula: °C = K - 273. Therefore, 273 K - 273 = 0°C.
Correct Answer: A — 0°C
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Q. What is the thermal conductivity of a material if a 1 m² area of it conducts 100 J of heat in 10 seconds with a temperature difference of 20°C?
A.
2 W/m°C
B.
5 W/m°C
C.
10 W/m°C
D.
20 W/m°C
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Solution
Using the formula Q = kA(T1-T2)t, we find k = Q / (A(T1-T2)t) = 100 J / (1 m² * 20°C * 10 s) = 0.5 W/m°C.
Correct Answer: B — 5 W/m°C
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Q. What is the total current in a circuit with a 15V battery and two 5Ω resistors in series? (2023)
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Solution
Total resistance R = 5Ω + 5Ω = 10Ω; I = V/R = 15V / 10Ω = 1.5A.
Correct Answer: B — 2A
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Q. What is the total current in a circuit with a voltage of 240V, resistance of 20 ohms, and inductive reactance of 30 ohms? (2022)
A.
8 A
B.
6 A
C.
4 A
D.
10 A
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Solution
Z = √(R² + Xl²) = √(20² + 30²) = √(400 + 900) = √1300 = 36.06 ohms. I = V/Z = 240/36.06 = 6.66 A.
Correct Answer: B — 6 A
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Q. What is the total current in a parallel circuit with two branches carrying 3A and 5A? (2020)
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Solution
In a parallel circuit, the total current (I_total) is the sum of the currents in each branch: I_total = 3A + 5A = 8A.
Correct Answer: A — 8A
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Q. What is the total current in a parallel circuit with two branches, one with 5A and the other with 3A? (2022)
A.
8A
B.
15A
C.
2.5A
D.
5A
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Solution
Total current in parallel = I1 + I2 = 5A + 3A = 8A.
Correct Answer: A — 8A
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Q. What is the total mechanical energy of a system at the highest point of a projectile's trajectory?
A.
Maximum potential energy
B.
Maximum kinetic energy
C.
Zero energy
D.
Constant energy
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Solution
At the highest point of a projectile's trajectory, the kinetic energy is minimum (zero at the peak) and potential energy is maximum, thus total mechanical energy is maximum potential energy.
Correct Answer: A — Maximum potential energy
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Q. What is the total power consumed in a circuit with two 10Ω resistors in series connected to a 20V source? (2020)
A.
20W
B.
40W
C.
10W
D.
30W
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Solution
Total resistance R = 10Ω + 10Ω = 20Ω. Power P = V²/R = 20² / 20 = 20W.
Correct Answer: B — 40W
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Q. What is the total power consumed in a circuit with two 5Ω resistors in series connected to a 30V battery? (2023)
A.
90W
B.
60W
C.
30W
D.
45W
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Solution
Total resistance R = 5Ω + 5Ω = 10Ω; Power P = V²/R = 30²/10 = 90W.
Correct Answer: B — 60W
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Q. What is the total resistance in a series circuit with resistors of 2Ω, 3Ω, and 5Ω?
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Solution
In a series circuit, total resistance (R_total) is the sum of individual resistances: R_total = R1 + R2 + R3 = 2Ω + 3Ω + 5Ω = 10Ω.
Correct Answer: A — 10Ω
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Q. What is the total resistance of two resistors of 4Ω and 6Ω connected in parallel? (2021)
A.
2.4Ω
B.
10Ω
C.
24Ω
D.
1.5Ω
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Solution
For parallel resistors, 1/R_eq = 1/R1 + 1/R2 = 1/4 + 1/6. Finding a common denominator gives R_eq = 2.4Ω.
Correct Answer: A — 2.4Ω
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Q. What is the unit of electric charge in the SI system? (2019)
A.
Coulomb
B.
Ampere
C.
Volt
D.
Ohm
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Solution
The unit of electric charge is Coulomb (C).
Correct Answer: A — Coulomb
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Q. What is the unit of work in the SI system? (2023)
A.
Joule
B.
Newton
C.
Watt
D.
Pascal
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Solution
The SI unit of work is Joule (J).
Correct Answer: A — Joule
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Q. What is the voltage across a 10Ω resistor carrying a current of 3A? (2022)
A.
30V
B.
20V
C.
10V
D.
15V
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Solution
Using Ohm's law, V = IR = 3A * 10Ω = 30V.
Correct Answer: A — 30V
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