NEET PHYSICS 30 PYQ MCQS QUIZ AUGUST 19

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NEET Physics Theory-Based Chapter Test

30 MCQs | PYQ-Style Questions

+4 Correct | -1 Incorrect | 0 Unattempted

Instructions

• 30 theory-based Physics MCQs.
• Questions are based on important NEET/PYQ concepts.
• No numerical or calculation-based questions.
• Each correct answer carries +4 marks.
• Each incorrect answer carries -1 mark.
• Unattempted questions carry 0 marks.
• Correct answers and explanations appear after submission.

Test Result

1. According to Newton's first law of motion, a body continues in its state of rest or uniform motion unless:

A. Its mass changes B. An external unbalanced force acts on it C. Its velocity becomes zero D. Its acceleration becomes constant

Correct Answer: B. An external unbalanced force acts on it.
Newton's first law is the law of inertia. A body maintains its state of rest or uniform motion unless acted upon by an external unbalanced force.

2. Newton's second law of motion establishes a relationship between:

A. Mass and displacement B. Velocity and displacement C. Force and rate of change of momentum D. Energy and time

Correct Answer: C. Force and rate of change of momentum.
Newton's second law states that force is proportional to the rate of change of momentum.

3. The inertia of a body depends primarily on its:

A. Mass B. Velocity C. Acceleration D. Shape

Correct Answer: A. Mass.
Mass is a measure of the inertia of a body. Greater mass means greater resistance to a change in motion.

4. The work done by a force is zero when the angle between force and displacement is:

A. 0° B. 45° C. 60° D. 90°

Correct Answer: D. 90°.
Work done is the dot product of force and displacement. When they are perpendicular, their dot product is zero.

5. Which of the following is a conservative force?

A. Frictional force B. Gravitational force C. Viscous force D. Air resistance

Correct Answer: B. Gravitational force.
Gravitational force is conservative because the work done depends only on the initial and final positions.

6. The total mechanical energy of an isolated system remains constant when:

A. Only friction acts B. Air resistance acts C. Only conservative forces act D. External non-conservative forces act

Correct Answer: C. Only conservative forces act.
Mechanical energy remains conserved when only conservative forces are involved.

7. The centre of mass of a system is the point where:

A. The entire mass of the system may be considered concentrated for translational motion B. The entire system necessarily has zero velocity C. The system always has maximum potential energy D. All external forces vanish

Correct Answer: A.
The centre of mass is the effective point at which the mass of a system can be considered concentrated for describing translational motion.

8. The torque of a force about a point is maximum when the angle between the force and position vector is:

A. 0° B. 30° C. 60° D. 90°

Correct Answer: D. 90°.
Torque is maximum when the force is perpendicular to the position vector.

9. The angular momentum of a system remains conserved when:

A. Its angular velocity is zero B. The net external torque is zero C. Its mass is zero D. Its kinetic energy is zero

Correct Answer: B. The net external torque is zero.
Angular momentum remains conserved when the net external torque acting on the system is zero.

10. Kepler's second law states that the line joining a planet and the Sun sweeps:

A. Equal distances in equal times B. Equal angles in unequal times C. Equal areas in equal times D. Equal velocities in equal times

Correct Answer: C. Equal areas in equal times.
Kepler's second law is also known as the law of areas.

11. The escape velocity from a planet is independent of:

A. The mass of the escaping body B. The mass of the planet C. The radius of the planet D. Gravitational acceleration

Correct Answer: A. The mass of the escaping body.
Escape velocity depends on the mass and radius of the planet, but not on the mass of the escaping object.

12. According to Bernoulli's principle, for steady flow of an ideal fluid, an increase in fluid speed is associated with:

A. Increase in pressure B. No change in pressure C. Increase in density only D. Decrease in pressure

Correct Answer: D. Decrease in pressure.
For steady ideal fluid flow, an increase in velocity is accompanied by a decrease in pressure, keeping the Bernoulli relation satisfied.

13. Surface tension of a liquid is mainly due to:

A. Gravitational force only B. Cohesive forces between liquid molecules C. Magnetic forces D. Nuclear forces

Correct Answer: B. Cohesive forces between liquid molecules.
Surface tension results primarily from intermolecular cohesive forces.

14. In simple harmonic motion, the acceleration of the particle is:

A. Always constant B. Independent of displacement C. Directly proportional to displacement and opposite in direction D. Always in the direction of displacement

Correct Answer: C.
In SHM, acceleration is proportional to displacement and directed towards the mean position.

15. At the mean position of a particle executing simple harmonic motion, its:

A. Kinetic energy is maximum B. Potential energy is maximum C. Velocity is zero D. Acceleration is maximum

Correct Answer: A. Kinetic energy is maximum.
At the mean position, speed is maximum and displacement is zero, so kinetic energy is maximum.

16. Sound waves in air are:

A. Transverse electromagnetic waves B. Transverse mechanical waves C. Electromagnetic waves D. Longitudinal mechanical waves

Correct Answer: D. Longitudinal mechanical waves.
Sound travels through air by compressions and rarefactions, making it a longitudinal mechanical wave.

17. The phenomenon responsible for the change in frequency observed due to relative motion between source and observer is called:

A. Resonance B. Doppler effect C. Diffraction D. Polarisation

Correct Answer: B. Doppler effect.
The Doppler effect is the apparent change in frequency due to relative motion between the source and observer.

18. According to the first law of thermodynamics, heat supplied to a system is used to:

A. Only increase temperature B. Only perform work C. Change internal energy and/or perform work D. Destroy energy

Correct Answer: C.
Heat supplied can increase the internal energy of the system and/or be used in doing work.

19. In an isothermal process for an ideal gas, which quantity remains constant?

A. Temperature B. Pressure C. Volume D. Internal energy of every possible system

Correct Answer: A. Temperature.
An isothermal process occurs at constant temperature. For an ideal gas, internal energy is also a function only of temperature.

20. The second law of thermodynamics introduces the concept of:

A. Charge B. Mass C. Momentum D. Entropy

Correct Answer: D. Entropy.
The second law of thermodynamics is fundamentally associated with entropy and the direction of spontaneous processes.

21. According to Coulomb's law, electrostatic force between two point charges is proportional to:

A. Sum of their charges B. Product of their charges C. Difference between their charges D. Square of their charges individually

Correct Answer: B. Product of their charges.
The magnitude of electrostatic force is proportional to the product of the magnitudes of the two charges.

22. The electric field inside a conductor in electrostatic equilibrium is:

A. Maximum B. Variable C. Zero D. Infinite

Correct Answer: C. Zero.
In electrostatic equilibrium, the electric field inside a conductor is zero because free charges redistribute themselves until equilibrium is reached.

23. The capacitance of a capacitor depends on:

A. Geometry of the conductors and dielectric medium B. Charge stored only C. Current through the capacitor only D. Resistance of the connecting wire only

Correct Answer: A.
Capacitance is determined by the geometry of the capacitor and the dielectric medium between its conductors.

24. The direction of conventional current in an external circuit is taken as the direction of:

A. Electron flow B. Neutron flow C. Magnetic field D. Motion of positive charge

Correct Answer: D. Motion of positive charge.
Conventional current is defined in the direction in which positive charges would move.

25. A magnetic field exerts a force on a charged particle when the particle:

A. Is necessarily at rest