Medical Entrance
Q. If a circuit has a current of 3 A and a resistance of 4 Ω, what is the power consumed? (2020)
A.
12 W
B.
7 W
C.
3 W
D.
1 W
Show solution
Solution
Power (P) can be calculated using P = I² × R = (3 A)² × 4 Ω = 12 W.
Correct Answer: A — 12 W
Learn More →
Q. If a circuit has a resistance of 12Ω and a current of 3A, what is the power consumed in the circuit? (2022)
A.
36W
B.
24W
C.
12W
D.
9W
Show solution
Solution
Power (P) can be calculated using the formula P = I^2 * R = (3A)^2 * 12Ω = 36W.
Correct Answer: A — 36W
Learn More →
Q. If a circuit has a total resistance of 10Ω and a current of 3A, what is the voltage across the circuit? (2021)
A.
10V
B.
20V
C.
30V
D.
40V
Show solution
Solution
Using Ohm's law, V = I * R = 3A * 10Ω = 30V.
Correct Answer: C — 30V
Learn More →
Q. If a circuit has a total resistance of 12Ω and a current of 2A, what is the voltage across the circuit? (2020)
A.
12V
B.
24V
C.
6V
D.
18V
Show solution
Solution
Using Ohm's law, V = I * R = 2A * 12Ω = 24V.
Correct Answer: B — 24V
Learn More →
Q. If a circuit has a total resistance of 8Ω and a current of 2A flows through it, what is the voltage across the circuit? (2020)
A.
4V
B.
8V
C.
12V
D.
16V
Show solution
Solution
Using Ohm's law, V = I * R = 2A * 8Ω = 16V.
Correct Answer: B — 8V
Learn More →
Q. If a circuit has a total voltage of 24V and a total resistance of 6Ω, what is the total current flowing through the circuit? (2023)
Show solution
Solution
Using Ohm's law, I = V/R = 24V/6Ω = 4A.
Correct Answer: B — 4A
Learn More →
Q. If a circuit has a total voltage of 24V and a total resistance of 6Ω, what is the total current? (2020)
Show solution
Solution
Using Ohm's law, I = V/R = 24V/6Ω = 4A.
Correct Answer: B — 4A
Learn More →
Q. If a circuit has a total voltage of 24V and a total resistance of 8Ω, what is the total current flowing through the circuit? (2023)
Show solution
Solution
Using Ohm's law, I = V/R = 24V/8Ω = 3A.
Correct Answer: C — 4A
Learn More →
Q. If a circuit has a voltage of 12 V and a resistance of 3 ohms, what is the current flowing through the circuit? (2022)
A.
4 A
B.
3 A
C.
2 A
D.
1 A
Show solution
Solution
Using Ohm's law (I = V/R), I = 12 V / 3 Ω = 4 A.
Correct Answer: A — 4 A
Learn More →
Q. If a circuit has a voltage of 24V and a current of 6A, what is the resistance? (2022)
Show solution
Solution
Using Ohm's Law, R = V/I = 24V / 6A = 4Ω.
Correct Answer: D — 8Ω
Learn More →
Q. If a force of 10 N is applied to a mass of 2 kg, what will be the acceleration of the mass? (2019)
A.
2 m/s²
B.
5 m/s²
C.
10 m/s²
D.
20 m/s²
Show solution
Solution
Using F = ma, a = F/m = 10 N / 2 kg = 5 m/s².
Correct Answer: B — 5 m/s²
Learn More →
Q. If a force of 10 N moves an object 5 m in the direction of the force, what is the work done? (2020)
A.
50 J
B.
10 J
C.
5 J
D.
25 J
Show solution
Solution
Work Done (W) = Force (F) * Distance (d) = 10 N * 5 m = 50 J
Correct Answer: A — 50 J
Learn More →
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
Show solution
Solution
Power (P) = Work Done (W) / Time (t) = 200 J / 5 s = 40 W
Correct Answer: B — 50 W
Learn More →
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
Show solution
Solution
Power (P) = Work Done / Time = 2000 J / 5 s = 400 W
Correct Answer: A — 400 W
Learn More →
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
Show solution
Solution
A high shear modulus indicates that the material resists shear deformation.
Correct Answer: C — It resists shear deformation
Learn More →
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
Show solution
Solution
Accuracy refers to how close a measurement is to the true value.
Correct Answer: B — Measurements are close to the true value
Learn More →
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
Show solution
Solution
Accuracy refers to how close a measured value is to the true value.
Correct Answer: A — It is close to the true value
Learn More →
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
Learn More →
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
Learn More →
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
Learn More →
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
Learn More →
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
Learn More →
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
Learn More →
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
Learn More →
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
Learn More →
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
Learn More →
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)
Show solution
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
Learn More →
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
Learn More →
Q. If the current flowing through a resistor is 2A and the voltage across it is 6V, what is the resistance? (2022)
Show solution
Solution
Using Ohm's Law, R = V / I = 6V / 2A = 3Ω.
Correct Answer: A — 3Ω
Learn More →
Q. If the current through a conductor is doubled, what happens to the heat produced in the conductor? (2020)
A.
It halves
B.
It doubles
C.
It quadruples
D.
It remains the same
Show solution
Solution
The heat produced is proportional to the square of the current (H ∝ I²), so if I is doubled, heat becomes 4 times.
Correct Answer: C — It quadruples
Learn More →
Showing 61 to 90 of 1434 (48 Pages)
