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1. What is the value of Universal Gravitational Constant (G)?
A. 9.8 m/s²
B. 6.67 × 10⁻¹¹ N·m²/kg²
C. 6.67 × 10¹¹ N·m²/kg²
D. 9.8 × 10⁻¹¹ N·m²/kg²
Answer: B. 6.67 × 10⁻¹¹ N·m²/kg²
Explanation: The accepted value of G was measured by Henry Cavendish and is 6.673 × 10⁻¹¹ N·m²/kg².
2. How does the gravitational force between two objects change if the distance between them is doubled?
A. Doubles
B. Quadruples
C. Becomes one-half
D. Becomes one-fourth
Answer: D. Becomes one-fourth
Explanation: Gravitational force follows inverse-square law (F ∝ 1/d²). If distance d is doubled (2d), F becomes 1/(2)² = 1/4th of its initial value.
3. What is the average acceleration due to gravity (g) near the surface of the Earth?
A. 9.8 m/s²
B. 6.67 m/s²
C. 9.8 N·m²/kg²
D. 0 m/s²
Answer: A. 9.8 m/s²
Explanation: Standard acceleration due to gravity on Earth's surface is approximately 9.8 m/s².
4. The weight of an object on the Moon is approximately how much of its weight on Earth?
A. 1/2
B. 1/4
C. 1/6
D. Same as on Earth
Answer: C. 1/6
Explanation: Because the mass and radius of the Moon are smaller, acceleration due to gravity on the Moon (g_moon) is about 1/6th of g_earth.
5. Which of the following statements about Mass and Weight is correct?
A. Mass changes with location, weight remains constant
B. Mass is a vector quantity, weight is a scalar quantity
C. Mass remains constant everywhere, weight varies with gravity
D. Both mass and weight have the same SI unit
Answer: C. Mass remains constant everywhere, weight varies with gravity
Explanation: Mass is the amount of matter in a body and stays constant. Weight (W = mg) is a force that depends on local acceleration due to gravity (g).
6. What is the SI unit of Pressure?
A. Newton (N)
B. Pascal (Pa)
C. Joule (J)
D. kg/m³
Answer: B. Pascal (Pa)
Explanation: Pressure is force per unit area (N/m²). One Newton per square meter is defined as 1 Pascal (Pa).
7. According to Archimedes' Principle, when a body is immersed fully or partially in a fluid, it experiences an upward buoyant force equal to:
A. Total volume of the fluid
B. Mass of the body immersed
C. Weight of the fluid displaced by it
D. Total surface area of the body
Answer: C. Weight of the fluid displaced by it
Explanation: Archimedes' Principle states that buoyant force acting on a submerged object equals the weight of the liquid displaced by that object.
8. An object will float in a liquid if its density is:
A. Greater than the density of the liquid
B. Less than or equal to the density of the liquid
C. Double the density of the liquid
D. Independent of liquid density
Answer: B. Less than or equal to the density of the liquid
Explanation: If an object has a density less than (or equal to) the liquid, the buoyant force balances its weight, allowing it to float.
9. What is Relative Density?
A. Density of substance / Density of water
B. Density of water / Density of substance
C. Mass of substance × Volume of water
D. Density of substance × Density of water
Answer: A. Density of substance / Density of water
Explanation: Relative density is the ratio of the density of a substance to the density of water at 4°C. It has no units.
10. If an object weighs 60 N on Earth, what would be its weight on the surface of the Moon?
A. 60 N
B. 360 N
C. 10 N
D. 6 N
Answer: C. 10 N
Explanation: Weight on Moon = 1/6 × Weight on Earth = 1/6 × 60 N = 10 N.
This page contains a chapter-wise objective practice set. Try the questions without checking the answer first, then use the explanation to understand the point you missed. The current page contains 10 questions, so you can practise in smaller sets when you are revising.
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