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What is the gravitational force between two masses of 10 kg each separated by a distance of 1 m? (G = 6.67 × 10⁻¹¹ N m²/kg²)
6.67 × 10⁻⁹ N
6.67 × 10⁻¹⁰ N
6.67 × 10⁻¹¹ N
6.67 × 10⁻⁸ N
Correct Answer: A — 6.67 × 10⁻⁹ N
Explanation:
F = G × m₁ × m₂ / r² = 6.67 × 10⁻¹¹ × 10 × 10 / 1² = 6.67 × 10⁻⁹ N.
A resistor of 10 Ω is connected across a 5 V battery. What is the current through the resistor?
50 A
2 A
0.5 A
5 A
Correct Answer: C — 0.5 A
Explanation:
By Ohm's law: I = V / R = 5 / 10 = 0.5 A.
What is the speed of light in a vacuum?
3 × 10⁸ m/s
3 × 10⁶ m/s
3 × 10¹⁰ m/s
3 × 10⁴ m/s
Correct Answer: A — 3 × 10⁸ m/s
Explanation:
The speed of light in vacuum is approximately 3 × 10⁸ m/s.
A force of 20 N displaces a body by 5 m in the direction of force. What is the work done?
4 J
25 J
100 J
50 J
Correct Answer: C — 100 J
Explanation:
Work = Force × Displacement = 20 × 5 = 100 J.
A body starts from rest and accelerates uniformly at 4 m/s². What is its velocity after 5 seconds?
10 m/s
20 m/s
25 m/s
15 m/s
Correct Answer: B — 20 m/s
Explanation:
Using v = u + at. u = 0, a = 4 m/s², t = 5 s. v = 0 + 4 × 5 = 20 m/s.
