Physics MCQs
Topic Notes: Physics
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
81
Which of the following is correct about moon's gravitation?
Answer:
Moon's gravitation = $${\frac{1}{6}^{th}}$$ of Earth's gravitation
Source answer preserved: option A (Moon's gravitation = $${\frac{1}{6}^{th}}$$ of Earth's gravitation). AI attempted to change protected answer data (option_a, option_b, option_c, option_d), so this item is flagged for manual review before study use.
82
Which physical law states that every particle in the universe attracts every other particle with a force proportional to the product of their masses and inversely proportional to the square of the distance between them?
Answer:
law of gravitation
Newton's Law of Universal Gravitation describes the gravitational attraction between two point masses. The formula F = G * (m1 * m2) / r^2 defines this relationship, where G is the gravitational constant. This law explains the motion of planets, the behavior of falling objects on Earth, and the structure of the universe on a large scale.
83
What is the name of the fundamental force that causes every object in the universe to attract every other object?
Answer:
gravitation
Gravitation is the universal force of attraction acting between all matter that possesses mass. According to Newton's Law of Universal Gravitation, every point mass attracts every other point mass by a force acting along the line intersecting both points, proportional to the product of their masses and inversely proportional to the square of the distance between them.
84
Which scientist is historically credited with formulating the universal law of gravitation?
Answer:
Isaac Newton
Sir Isaac Newton is widely recognized for developing the law of universal gravitation in his work 'Philosophiæ Naturalis Principia Mathematica'. He proposed that every particle of matter in the universe attracts every other particle with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
85
How does the gravitational force between two particles change if the distance separating them is increased?
Answer:
decreases
According to Newton's Law of Universal Gravitation, the force F is inversely proportional to the square of the distance r between the centers of the two masses (F ∝ 1/r²). Therefore, as the distance r increases, the gravitational force F must decrease.
86
How does the gravitational force between two objects change if the distance separating them is doubled?
Answer:
Gravitational force will decrease 4 times
According to Newton's Law of Universal Gravitation, the force is inversely proportional to the square of the distance between the centers of two masses (F ∝ 1/r²). If the distance r is doubled (2r), the force becomes proportional to 1/(2r)² = 1/(4r²). Therefore, the force decreases by a factor of four.
87
According to the law of universal gravitation, the force of attraction between two objects is proportional to which of the following?
Answer:
product of their masses
Newton's Law of Universal Gravitation states that every particle of matter in the universe attracts every other particle with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
88
Approximately how long does it take for light emitted from the Sun to reach the Earth?
Answer:
8 min
Light travels at a constant speed of approximately 300,000 kilometers per second. Given that the average distance from the Sun to the Earth is about 150 million kilometers, the light takes roughly 500 seconds, or approximately 8 minutes and 20 seconds, to complete the journey.
89
Two bodies kept at a certain distance feel a gravitational force F to each other. If the distance between them is made double the former distance, the force will be
Answer:
$$\frac{1}{4}F$$
Source answer preserved: option D ($$\frac{1}{4}F$$). AI attempted to change protected answer data (option_b, option_d), so this item is flagged for manual review before study use.
90
What happens to the magnitude of the gravitational force exerted by the Earth as an object moves further away from its surface?
Answer:
weaker
According to Newton's Law of Universal Gravitation, the gravitational force between two objects is inversely proportional to the square of the distance between their centers. As the distance from the Earth increases, the denominator in the force equation grows, causing the overall gravitational force to decrease. Therefore, the force becomes weaker as the object moves further away.