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NCERT Solutions › Physics › Chapter 1

Chapter 1: Physical World

NCERT Solutions for CBSE Class 10 Physics — 12 solved questions with detailed explanations.

12
Questions
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Topics

Solved Questions

Q1. Which of the following is NOT a fundamental force of nature?

Difficulty: Easy · Topic: Fundamental Forces

Solution

Centripetal force is a pseudo/resultant force, not a fundamental force. The four fundamental forces are: gravitational, electromagnetic, strong nuclear, and weak nuclear.

Q2. Which branch of physics deals with the study of heat and temperature?

Difficulty: Easy · Topic: Branches

Solution

Thermodynamics is the branch that deals with heat, temperature, and their relation to energy and work.

Q3. Which of the following is a dimensionless quantity?

Difficulty: Easy · Topic: Fundamental Concepts

Solution

Strain = ΔL/L, a ratio of two lengths, hence dimensionless.

Q4. Physics is broadly divided into classical and:

Difficulty: Easy · Topic: Fundamental Concepts

Solution

Physics is divided into classical physics and modern physics (relativity + quantum mechanics).

Q5. Which of the following is NOT a fundamental interaction?

Difficulty: Easy · Topic: Fundamental Concepts

Solution

Spring force is a macroscopic manifestation of electromagnetic interaction, not a fundamental force.

Q6. The scientific method begins with:

Difficulty: Easy · Topic: Fundamental Concepts

Solution

The scientific method starts with observation, then hypothesis, experiment, and conclusion.

Q7. Unification of electricity and magnetism was achieved by:

Difficulty: Easy · Topic: Fundamental Concepts

Solution

James Clerk Maxwell unified electricity and magnetism in his electromagnetic theory (1865).

Q8. The gravitational force is always:

Difficulty: Easy · Topic: Fundamental Concepts

Solution

Gravitational force is always attractive between any two masses.

Q9. Which principle states that fundamental laws are the same everywhere?

Difficulty: Easy · Topic: Fundamental Concepts

Solution

The universality of physical laws means the same laws apply throughout the universe.

Q10. The weakest fundamental force is:

Difficulty: Easy · Topic: Fundamental Concepts

Solution

Gravitational force is the weakest (10^-39 times the strong force) but has infinite range.

Q11. The dimensional formula of Planck's constant is the same as that of:

Difficulty: Easy-Medium · Topic: Dimensions

Solution

Planck's constant h has dimensions [ML²T⁻¹]. Angular momentum L = mvr also has dimensions [ML²T⁻¹].

Q12. Which of the following quantities has the same dimensions as energy?

Difficulty: Easy-Medium · Topic: Dimensions

Solution

Torque and energy both have dimensions [ML²T⁻²].

Other Chapters in Physics

Ch 2: Units & MeasurementsCh 3: Motion in a Straight LineCh 4: Motion in a PlaneCh 5: Laws of MotionCh 6: Work Energy & PowerCh 7: System of ParticlesCh 8: GravitationCh 9: Mechanical Properties of SolidsCh 10: Mechanical Properties of FluidsCh 11: Thermal Properties of MatterCh 12: ThermodynamicsCh 13: Kinetic TheoryCh 14: OscillationsCh 15: Waves

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