9th physics important long questions

Virtual Science Academy

Physics Questions

Chapter 2

Discuss base and derived quantities and units. Also, make their table.

What is vernier calipers? Discuss its working and draw a labeled diagram.

What is screw gauge? Discuss its pitch. Also explain its Z.E and Z.C.

What is physical balance? How it can be used to find mass of a small stone?

What are measuring cylinders? How they can be used?

What are significant figures? Write their rules.

Chapter 3

Define motion and explain its types.

What are vectors? How they can be represented?

Explain distance-time and speed-time graphs.

Derive the first equation of motion with the help of a graph.

Derive the second equation of motion with the help of a graph.

Derive the third equation of motion with the help of a graph OR derive an equation of motion which is independent of time.

Explain motion of free-falling objects.

Chapter 4

State and explain Newton's first law of motion or law of inertia with examples.

State and explain Newton's second law of motion. How is it related to the rate of change in momentum?

Find tension and acceleration in a string when two objects attached to the string move vertically.

Explain the law of conservation of momentum with examples.

What is friction and coefficient of friction? Explain losses and gains of friction. Give ways to reduce friction.

Chapter 5

State Newton's law of gravitation. How is it according to the third law of motion?

What is a gravitational field?

Derive an equation for the mass of the Earth.

How does the value of g vary with altitude?

What are artificial satellites? Discuss their motion.

Chapter 6

Define work, derive its formula. On what factors does it depend?

Define kinetic energy. Derive its formula.

How can fossil fuels and nuclear fuels be used as a source of energy? Write their dangers.

Explain solar cells and wind energy.

What is thermal pollution? Write its effects on the environment. Discuss steps to reduce thermal pollution.

Chapter 7

Discuss properties of solids, gases, liquids, and plasma using the kinetic molecular model of matter.

What is atmospheric pressure? How can it be measured?

Derive an equation for pressure in liquids.

State Pascal’s law and explain the hydraulic press and braking system of vehicles.

State Archimedes' principle. How can it be used to find the density of objects?

Discuss the principle of floatation. How does it explain the motion of ships and submarines?

State Hooke’s law and sketch a graph between force and extension.

Explain Young’s modulus by defining stress and strain.

Chapter 8

What is a thermometer? Discuss scales of temperature.

What is specific heat capacity? Write the importance of the large specific heat of water.

Discuss latent heat of fusion and vaporization.

What is evaporation? Discuss factors affecting the rate of evaporation.

Derive an equation for linear thermal expansion in solids.

Discuss volumetric thermal expansion.

Write applications and consequences of thermal expansion (Bi-metallic strip).

Explain real and apparent thermal expansion with the help of an activity.

Chapter 9

Explain conduction.

What is thermal conductivity? Derive its formula.

Write uses of conductors and non-conductors.

Explain convection with the help of an activity.

What are convection currents? Write their uses.

Explain the greenhouse effect.

What are radiations? Write their consequences and applications.