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NEET Practice Questions (MCQs) with Answers & Solutions

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A balloon is inflated and then released. The air rushes out of the nozzle, and the balloon moves in the opposite direction. This phenomenon best demonstrates which of Newton's laws of motion?

A. Newton's First Law of Motion B. Newton's Second Law of Motion C. Newton's Third Law of Motion D. Law of Conservation of Energy

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Explanation

The expulsion of air (action) creates a thrust force on the balloon in the opposite direction (reaction), causing it to move. This is a direct application of Newton's Third Law: 'To every action, there is always an equal and opposite reaction'.

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When a person walks, they push the ground backward with their feet. According to Newton's Third Law, the ground simultaneously:

A. Pushes the person forward with an equal and opposite force. B. Pushes the person backward with an equal and opposite force. C. Exerts no force on the person. D. Absorbs the force exerted by the person.

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Explanation

The NCERT states, 'Force on a body A by body B is equal and opposite to the force on the body B by A.' When the person pushes the ground backward (action), the ground pushes the person forward (reaction), enabling them to move.

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A force $F_{ ext{AB}}$ is exerted by body A on body B. According to Newton's Third Law, the force exerted by body B on body A, $F_{ ext{BA}}$, will satisfy which condition?

A. $F_{ ext{AB}} = F_{ ext{BA}}$ B. $F_{ ext{AB}} = -F_{ ext{BA}}$ C. $F_{ ext{AB}} > F_{ ext{BA}}$ D. $F_{ ext{AB}} < F_{ ext{BA}}$

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Explanation

The NCERT text explicitly states, 'Force on a body A by body B is equal and opposite to the force on the body B by A'. This means the forces have the same magnitude but act in opposite directions, represented by the negative sign in the vector equation.

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In the context of Newton's Third Law, what does the term 'action' refer to?

A. force that precedes another force. B. Any of the two mutual forces between a pair of bodies. C. force that causes a reaction. D. The initial force in a sequence of interactions.

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Explanation

The NCERT states, 'Any of the two mutual forces can be called action and the other reaction. Action and reaction forces are simultaneous forces. There is no cause-effect relation between action and reaction.' This clarifies that 'action' does not imply precedence or causality in physics.

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Which of the following scenarios best illustrates an action-reaction pair?

A. Gravity pulling a ball downwards and the normal force of the ground pushing it upwards when it's at rest on the ground. B. person pushing a wall and the wall pushing back on the person. C. car accelerating forward and the force of friction between the tires and the road. D. satellite orbiting Earth due to Earth's gravitational pull.

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Explanation

An action-reaction pair involves forces between two interacting bodies. When a person pushes a wall, the wall simultaneously pushes back on the person with an equal and opposite force. The other options describe forces acting on a single body or a single force component.

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According to the NCERT text, why can't action and reaction forces cancel each other out?

A. Because they are always of different magnitudes. B. Because they act simultaneously. C. Because they act on different bodies. D. Because they are not always opposite in direction.

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Explanation

The NCERT text clearly states, 'Action and reaction act on different bodies and so they cannot be cancelled out.' For forces to cancel, they must act on the same body.

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Newton's Third Law primarily describes the interactions between:

A. body and its environment. B. single body and an external force. C. Pairs of bodies. D. Forces within a single body.

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Explanation

The text states, 'Forces in nature always occur between pairs of bodies.' Newton's Third Law defines these mutual interactions.

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The Law of Conservation of Momentum is a consequence of which other laws of motion?

A. Newton's First Law and Second Law B. Newton's Second Law and Third Law C. Newton's First Law and Third Law D. Only Newton's Second Law

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Explanation

The NCERT states, 'The law [of Conservation of Momentum] follows from the second and third law of motion.'

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When a gun is fired, the bullet moves forward, and the gun recoils backward. This backward movement of the gun is due to:

A. Newton's First Law (inertia) B. Newton's Second Law ($ ext{F=ma}$) C. Newton's Third Law (action-reaction) D. Conservation of energy

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Explanation

The force exerted by the gun on the bullet (action) causes the bullet to move forward. Simultaneously, the bullet exerts an equal and opposite force on the gun (reaction), causing the gun to recoil. This is a classic example of Newton's Third Law.

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Which of the following statements correctly describes the impact of a substituent on the benzene ring's reactivity towards electrophilic substitution and the orientation of the incoming group?

A. The nature of groups or substituents attached to the benzene ring influences its stability but not its reactivity or orientation. B. Substituents only affect the orientation of the incoming group, not the overall reactivity of the benzene ring. C. The nature of groups or substituents attached to the benzene ring is responsible for activation or deactivation of the benzene ring towards further electrophilic substitution and also for orientation of the incoming group. D. Activation or deactivation of the benzene ring is solely dependent on the size of the substituent, not its electronic nature.

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Explanation

The NCERT text states: 'The nature of groups or substituents attached to benzene ring is responsible for activation or deactivation of the benzene ring towards further electrophilic substitution and also for orientation of the incoming group.' This directly supports option o3.

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