Exam (elaborations)
XI Physics _New Chap-4_ Laws of Motion (Impactful Statements).
XI Physics _New Chap-4_ Laws of Motion (Impactful Statements).
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XI Physics_New Chapter-4_Laws of Motion [True or False Statement Questions]Sl # Statement [INTRO] True/False
1 A bar magnet can attract an iron nail only when in direct contact with it. FALSE
2 A boat can move in a flowing river without any external force. TRUE
3 A boat moves in a flowing river without any external force acting on it. FALSE
4 A body in uniform motion requires no external force to maintain its motion. TRUE
5 A football at rest can be moved without an external force. FALSE
6 A football at rest can move only when an external force, like a kick, is applied. TRUE
A skater moving straight with constant speed on a horizontal ice slab requires an external
7 FALSE
force to maintain uniform motion.
8 A stone released from the top of a building accelerates downward due to air resistance. FALSE
A stone released from the top of a building accelerates downward due to the magnetic force
9 FALSE
of the Earth.
10 Acceleration is required for non-uniform motion. TRUE
11 An external force is necessary to retard or stop motion. TRUE
12 An external force is needed to throw a stone upwards. TRUE
13 An inclined plane can slow down a ball rolling down without applying any force. FALSE
External agencies like wind and stream can only exert force on objects in contact with them.
14 FALSE
15 External forces acting on a body are always proportional to the body's mass. FALSE
16 Gravitational forces can act on a body even from a distance. TRUE
17 Non-uniform motion necessitates the concept of acceleration. TRUE
18 Non-uniform motion needs only the concept of velocity. FALSE
To stop a ball rolling down an inclined plane, an external force should be applied in the
19 TRUE
direction of its motion.
20 Uniform motion only needs the concept of velocity, not acceleration. TRUE
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, XI Physics_New Chapter-4_Laws of Motion [True or False Statement Questions]
True/False
Sl # Statement [4.2 ARISTOTLE'S FALLACY]
A moving toy car comes to rest due to the external force of air resistance opposing its motion. FALSE
1
2 Aristotle believed an external force is required to keep a body in motion. TRUE
3 Aristotle's fallacy is based on his misunderstanding of the concept of inertia. TRUE
Aristotle's flaw was not considering the opposing force of friction, which led to his fallacy on TRUE
4
motion.
5 Aristotle's ideas on motion are still applicable in certain limited scenarios today. TRUE
Aristotle's view that an arrow keeps flying due to the air pushing it is now known to be FALSE
6
correct.
Assess the significant impact of Galileo's correction of Aristotle's fallacy on the development TRUE
7
of modern science.
Friction and viscous forces are always present in the natural world and require external forces TRUE
8
to overcome.
Galileo imagined a world with no frictional forces to arrive at the true law of nature for forces TRUE
9
and motion.
10 Galileo's contribution to modern science was to develop the concept of gravity. FALSE
Galileo's correct answer to Aristotle's question laid the foundation for Newtonian mechanics. TRUE
11
Galileo's correct answer to Aristotle's question was the result of advanced technological tools. FALSE
12
13 Galileo's insights on motion led to the birth of modern science. TRUE
Galileo's observations on motion involved a world with no frictional forces opposing uniform FALSE
14
motion.
15 Galileo's observations on motion relied solely on intuition and common experience. FALSE
If there were no friction, a child would not need to apply any force to keep a toy car in TRUE
16
uniform motion.
17 The flaw in Aristotle's argument was his failure to account for friction opposing motion. TRUE
The seventeenth-century discovery of Newtonian mechanics refuted Aristotle's ideas on TRUE
18
motion.
Uniform motion is possible without frictional forces opposing in a hypothetical world, as TRUE
19
imagined by Galileo.
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, XI Physics_New Chapter-4_Laws of Motion [True or False Statement Questions]
Sl # Statement [4.3 THE LAW OF INERTIA] True/False
1 A net external force is needed to maintain a body in uniform motion. FALSE
An external force is required to change the state of motion of a body according to the law of
2 TRUE
inertia.
Ancient Indian thinkers had a concept similar to inertia known as "vega," which referred to
3 TRUE
the tendency to move in a straight line.
Ancient Indian thinkers had an elaborate system of ideas on motion, including different types
4 TRUE
of forces and motion.
Galileo's experiments on inclined planes demonstrated that objects moving up an inclined
5 FALSE
plane accelerate.
In Galileo's experiment with a double inclined plane, the final height of the ball is nearly the
6 TRUE
same as the initial height when friction is absent.
In practice, a ball on a frictionless horizontal plane will continue to move with constant
7 TRUE
velocity due to the absence of friction.
In the absence of friction, a ball released on a smooth inclined plane will reach the same
8 TRUE
height it started from.
In the limiting case of a horizontal plane, the ball in Galileo's experiment travels an infinite
9 FALSE
distance.
In the limiting case when the slope of the second plane is zero (horizontal), the ball travels an
10 FALSE
infinite distance and never comes to rest.
Indian thinkers understood the difference between a wave and a current in the context of
11 TRUE
motion.
12 Inertia means "resistance to change," implying that a body resists changes in its motion. TRUE
13 Inertia refers to the body's tendency to change its state of rest or uniform motion. FALSE
14 Isaac Newton formulated the law of inertia as the second law of motion. FALSE
Isaac Newton played a significant role in the development of mechanics and formulated the
15 TRUE
first law of motion based on Galileo's law of inertia.
Motion on a horizontal plane is an intermediate situation between upward and downward
16 TRUE
motion.
17 Objects moving down an inclined plane accelerate, while those moving up retard. TRUE
The concept of "vega" in ancient Indian thought closely aligns with the modern concept of
18 TRUE
inertia.
The final height of a ball on a double inclined plane is always greater than its initial height in
19 FALSE
an idealized frictionless situation.
The law of inertia states that an object at rest remains at rest and an object in motion
20 TRUE
continues to move with constant velocity unless acted upon by an external force.
The law of inertia was inferred by Galileo from observations of motion on a double inclined
21 TRUE
plane.
The notion of "vega" in ancient Indian science is equivalent to the modern concept of air
22 FALSE
resistance.
The slope of the second plane in Galileo's experiment affects the distance the ball travels, but
23 FALSE
it always reaches the same height.
The state of rest and the state of uniform linear motion are equivalent according to Galileo's
24 TRUE
insights.
The state of rest and the state of uniform linear motion are not equivalent according to
25 FALSE
Galileo's observations.
When the slope of the second plane in the double inclined plane experiment is decreased, the
26 TRUE
ball reaches the same height but covers a longer distance.
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