## Contents in Disha Ncert Xtract Physics Pdf

In this pdf book, There are a total of 30 chapters. These names are the following:

1. Physical World
2. Units and Measurements
3. Motion in a Straight Line
4. Motion in a Plane
5. Laws of Motion
6. Work, Energy, and Power
7. System of Particles and Rotational Motion
8. Gravitation
9. Mechanical Properties of Solids
10. Mechanical Properties of Fluids
11. Thermal Properties of Matter
12. Thermodynamics
13. Kinetic Theory
14. Oscillations
15. Waves
16. Electric Charges and Fields
17. Electrostatic Potential and Capacitance
18. Current Electricity
19. Moving Charges and Magnetism
20. Magnetism and Matter
21. Electromagnetic Induction
22. Alternating Current
23. Electromagnetic Waves
24. Ray Optics and Optical Instruments
25. Wave Optics
26. Dual Nature of Radiation and Matter
27. Atoms
28. Nuclei
29. Semiconductor Electronics: Materials, Devices, and Simple Circuits
30. Communication Systems

## Important Questions of Physics

What is the unit of electric potential difference?
A) Ohm
B) Ampere
C) Volt
D) Coulomb

Which law of motion states that for every action, there is an equal and opposite reaction?
A) Newton’s First Law
B) Newton’s Second Law
C) Newton’s Third Law
D) Newton’s Law of Universal Gravitation

What is the SI unit of frequency?
A) Hertz
B) Newton
C) Pascal
D) Joule

Which of the following is a vector quantity?
A) Mass
B) Temperature
C) Speed
D) Displacement

What is the SI unit of work and energy?
A) Newton
B) Watt
C) Joule
D) Ohm

What is the state of matter in which particles have high energy and are not held together by strong forces?
A) Solid
B) Liquid
C) Gas
D) Plasma

Which of the following is an example of an electromagnetic wave used in communication?
A) Sound wave
B) X-ray
D) Water wave

What is the principle that states that the total electric charge in an isolated system remains constant?
A) Gauss’s Law
B) Coulomb’s Law
D) Conservation of Charge

Which of the following is the SI unit of pressure?
A) Pascal
B) Watt
C) Joule
D) Newton

What is the process by which a solid changes directly into a gas without passing through the liquid phase called?
A) Sublimation
B) Evaporation
C) Condensation
D) Melting

## Important MCQs of Physics for NEET, JEE

Which law of thermodynamics states that energy cannot be created or destroyed, only converted from one form to another?
A) Zeroth Law
B) First Law
C) Second Law
D) Third Law

What is the acceleration due to gravity on the surface of Earth?
A) 1 m/s²
B) 10 m/s²
C) 9.8 m/s²
D) 5 m/s²

Which electromagnetic wave has the highest energy per photon?
B) Microwave
C) Ultraviolet
D) Infrared

What is the SI unit of electric resistance?
A) Ohm
B) Ampere
C) Volt
D) Coulomb

What is the law that states that the pressure of a gas is inversely proportional to its volume at a constant temperature?
A) Boyle’s Law
B) Charles’s Law
C) Gay-Lussac’s Law

Which of the following is a unit of luminous intensity?
A) Lux
B) Candela
C) Lumen
D) Hertz

What is the energy stored in an object due to its position or height above the ground?
A) Kinetic energy
B) Gravitational potential energy
C) Elastic potential energy
D) Chemical energy

What is the principle that states that the angle of incidence is equal to the angle of reflection?
A) Snell’s Law
B) Huygens’ Principle
C) Fermat’s Principle
D) Law of Reflection

Which type of lens converges light rays to a single focal point?
A) Convex lens
B) Concave lens
C) Diverging lens
D) Plano-concave lens

What is the fundamental force that holds the nucleus of an atom together?
A) Gravitational force
B) Electromagnetic force
C) Weak nuclear force
D) Strong nuclear force