Q. A simple harmonic oscillator has an amplitude of 5 cm. What is the maximum displacement from the mean position?
A.
0 cm
B.
2.5 cm
C.
5 cm
D.
10 cm
Show solution
Solution
The maximum displacement in simple harmonic motion is equal to the amplitude, which is 5 cm.
Correct Answer: C — 5 cm
Learn More →
Q. A simple pendulum completes 20 oscillations in 40 seconds. What is its time period? (2021)
A.
1 s
B.
2 s
C.
0.5 s
D.
0.25 s
Show solution
Solution
Time period (T) = Total time / Number of oscillations = 40 s / 20 = 2 s.
Correct Answer: B — 2 s
Learn More →
Q. A simple pendulum has a length of 1 m. What is its time period? (2023)
A.
1.0 s
B.
2.0 s
C.
0.5 s
D.
0.25 s
Show solution
Solution
The time period T of a simple pendulum is given by T = 2π√(L/g). For L = 1 m and g = 9.8 m/s², T = 2π√(1/9.8) ≈ 2.0 s.
Correct Answer: A — 1.0 s
Learn More →
Q. A simple pendulum oscillates with a period of 2 seconds. What is the length of the pendulum? (2021)
A.
0.5 m
B.
1 m
C.
2 m
D.
4 m
Show solution
Solution
The period T of a simple pendulum is given by T = 2π√(L/g). Rearranging gives L = (T^2 * g) / (4π^2). Using g = 9.8 m/s² and T = 2 s, we find L = (2^2 * 9.8) / (4π^2) ≈ 1 m.
Correct Answer: B — 1 m
Learn More →
Q. A small insect can walk on the surface of water due to which of the following phenomena?
A.
Viscosity
B.
Surface tension
C.
Capillarity
D.
Buoyancy
Show solution
Solution
The insect can walk on water due to surface tension, which creates a 'skin' on the surface of the water.
Correct Answer: B — Surface tension
Learn More →
Q. A small insect can walk on the surface of water due to which property?
A.
Viscosity
B.
Surface tension
C.
Capillarity
D.
Density
Show solution
Solution
The insect can walk on water because of surface tension, which creates a 'skin' on the surface that can support the weight of the insect.
Correct Answer: B — Surface tension
Learn More →
Q. A small insect can walk on the surface of water without sinking. This is primarily due to:
A.
Buoyancy
B.
Surface tension
C.
Viscosity
D.
Density
Show solution
Solution
The insect can walk on water due to surface tension, which creates a 'skin' on the surface that can support the weight of the insect.
Correct Answer: B — Surface tension
Learn More →
Q. A snack contains 150 calories, with 10% from protein, 50% from carbohydrates, and 40% from fats. How many calories are from fats?
A.
40 calories
B.
50 calories
C.
60 calories
D.
70 calories
Show solution
Solution
40% of 150 calories = 0.40 * 150 = 60 calories from fats.
Correct Answer: C — 60 calories
Learn More →
Q. A snack contains 150 calories, with 60% from carbohydrates, 20% from protein, and 20% from fat. How many calories come from fat?
A.
20 calories
B.
30 calories
C.
40 calories
D.
50 calories
Show solution
Solution
20% of 150 calories = 0.20 * 150 = 30 calories.
Correct Answer: C — 40 calories
Learn More →
Q. A snack contains 250 calories, with 40% from carbohydrates, 30% from fats, and 30% from proteins. How many calories come from carbohydrates? (2022)
A.
80 calories
B.
90 calories
C.
100 calories
D.
110 calories
Show solution
Solution
40% of 250 = 0.40 * 250 = 100 calories.
Correct Answer: C — 100 calories
Learn More →
Q. A soap bubble has a radius of 0.1 m. What is the surface area of the bubble?
A.
0.04 m²
B.
0.12 m²
C.
0.25 m²
D.
0.31 m²
Show solution
Solution
Surface area of a sphere = 4πr² = 4π(0.1)² = 0.1256 m², approximately 0.31 m².
Correct Answer: D — 0.31 m²
Learn More →
Q. A soap bubble has a radius of 5 cm. What is the surface area of the bubble?
A.
100π cm²
B.
50π cm²
C.
25π cm²
D.
20π cm²
Show solution
Solution
Surface area of a sphere = 4πr² = 4π(5)² = 100π cm².
Correct Answer: A — 100π cm²
Learn More →
Q. A soap solution is added to water. What happens to the surface tension?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
Adding soap to water decreases the surface tension because soap molecules disrupt the cohesive forces between water molecules.
Correct Answer: B — Decreases
Learn More →
Q. A soap solution is added to water. What is the effect on the surface tension?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes negative
Show solution
Solution
Adding soap decreases the surface tension of water.
Correct Answer: B — Decreases
Learn More →
Q. A soil sample contains 40% sand, 30% silt, and 30% clay. What is the percentage of clay in the sample? (2022)
A.
30%
B.
40%
C.
50%
D.
20%
Show solution
Solution
The percentage of clay is given as 30%.
Correct Answer: A — 30%
Learn More →
Q. A soil sample contains 40% sand, 30% silt, and 30% clay. What is the percentage of silt in the sample? (2023)
A.
30%
B.
40%
C.
50%
D.
20%
Show solution
Solution
The percentage of silt in the sample is given as 30%.
Correct Answer: A — 30%
Learn More →
Q. A soil sample contains 40% sand, 30% silt, and 30% clay. What is the percentage of silt in the soil?
A.
30%
B.
40%
C.
50%
D.
20%
Show solution
Solution
The percentage of silt in the soil is given as 30%.
Correct Answer: A — 30%
Learn More →
Q. A soil sample has a moisture content of 20%. If the dry weight of the soil is 80 kg, what is the weight of the water in the sample?
A.
20 kg
B.
16 kg
C.
24 kg
D.
32 kg
Show solution
Solution
Weight of water = Moisture content × Dry weight = 0.20 × 80 kg = 16 kg.
Correct Answer: C — 24 kg
Learn More →
Q. A soldier can run 100 meters in 12 seconds. What is his speed in km/h? (2019)
A.
18 km/h
B.
20 km/h
C.
25 km/h
D.
30 km/h
Show solution
Solution
Speed = Distance / Time = 100 m / 12 s = 8.33 m/s. Converting to km/h: 8.33 * 18/5 = 30 km/h.
Correct Answer: B — 20 km/h
Learn More →
Q. A soldier runs 12 km in 1 hour and 15 minutes. What is his speed in km/h? (2023)
A.
8 km/h
B.
9 km/h
C.
10 km/h
D.
11 km/h
Show solution
Solution
Time = 1 hour + 15 minutes = 1.25 hours. Speed = Distance / Time = 12 km / 1.25 h = 9.6 km/h.
Correct Answer: B — 9 km/h
Learn More →
Q. A soldier runs 12 km in 1 hour and 30 minutes. What is his average speed in km/h? (2023)
A.
7.5 km/h
B.
8 km/h
C.
8.5 km/h
D.
9 km/h
Show solution
Solution
Average Speed = Distance / Time = 12 km / (1.5 h) = 8 km/h
Correct Answer: A — 7.5 km/h
Learn More →
Q. A soldier runs 5 km in 30 minutes. What is his speed in km/h? (2019)
A.
8 km/h
B.
10 km/h
C.
12 km/h
D.
15 km/h
Show solution
Solution
Speed = Distance / Time = 5 km / (30/60) h = 10 km/h
Correct Answer: B — 10 km/h
Learn More →
Q. A soldier runs a distance of 400 meters in 50 seconds. What is his average speed in m/s? (2022)
A.
6 m/s
B.
7 m/s
C.
8 m/s
D.
9 m/s
Show solution
Solution
Average speed = Distance / Time = 400 m / 50 s = 8 m/s.
Correct Answer: A — 6 m/s
Learn More →
Q. A solenoid has a length of 1 m and a cross-sectional area of 0.01 m². If the magnetic field inside it is 0.4 T, what is the magnetic flux?
A.
0.004 Wb
B.
0.04 Wb
C.
0.4 Wb
D.
0.1 Wb
Show solution
Solution
Magnetic flux (Φ) = B * A = 0.4 T * 0.01 m² = 0.004 Wb.
Correct Answer: B — 0.04 Wb
Learn More →
Q. A solenoid has a length of 1 m and a cross-sectional area of 0.01 m². If the magnetic field inside it is 0.2 T, what is the magnetic flux?
A.
0.002 Wb
B.
0.01 Wb
C.
0.02 Wb
D.
0.1 Wb
Show solution
Solution
Magnetic flux (Φ) = B * A. Here, Φ = 0.2 T * 0.01 m² = 0.002 Wb.
Correct Answer: C — 0.02 Wb
Learn More →
Q. A solenoid has a length of 1 m and a cross-sectional area of 0.01 m². If the magnetic field inside the solenoid is 0.2 T, what is the magnetic flux through one turn of the solenoid?
A.
0.002 Wb
B.
0.01 Wb
C.
0.02 Wb
D.
0.1 Wb
Show solution
Solution
Magnetic flux (Φ) = B * A = 0.2 T * 0.01 m² = 0.002 Wb. For one turn, the flux is 0.002 Wb.
Correct Answer: C — 0.02 Wb
Learn More →
Q. A solenoid of length L and cross-sectional area A carries a current I. What is the magnetic field inside the solenoid?
A.
μ₀nI
B.
μ₀I/n
C.
μ₀I/(nA)
D.
μ₀I/(2n)
Show solution
Solution
The magnetic field inside a solenoid is given by B = μ₀nI, where n is the number of turns per unit length.
Correct Answer: A — μ₀nI
Learn More →
Q. A solenoid produces a magnetic field similar to that of a bar magnet. What is the primary factor that determines the strength of the magnetic field in a solenoid? (2021)
A.
Length of the solenoid
B.
Number of turns per unit length
C.
Material of the solenoid
D.
Current flowing through the solenoid
Show solution
Solution
The strength of the magnetic field in a solenoid is primarily determined by the number of turns per unit length and the current flowing through it.
Correct Answer: B — Number of turns per unit length
Learn More →
Q. A solenoid produces a magnetic field similar to that of a bar magnet. What is the main factor that affects the strength of the magnetic field in a solenoid? (2021)
A.
Length of the solenoid
B.
Number of turns per unit length
C.
Material of the solenoid
D.
Current flowing through the solenoid
Show solution
Solution
The strength of the magnetic field in a solenoid is primarily affected by the number of turns per unit length and the current flowing through it.
Correct Answer: B — Number of turns per unit length
Learn More →
Q. A solenoid produces a magnetic field when an electric current passes through it. What happens to the magnetic field if the current is reversed?
A.
The magnetic field disappears
B.
The magnetic field direction reverses
C.
The magnetic field strength increases
D.
The magnetic field strength decreases
Show solution
Solution
Reversing the current in a solenoid reverses the direction of the magnetic field according to the right-hand rule.
Correct Answer: B — The magnetic field direction reverses
Learn More →
Showing 2161 to 2190 of 25216 (841 Pages)