9th Class Physics Past Paper 2023
Note: Physics 1st Time Paper of 9th Class.
Group-I (Subjective) 48 Marks
Part– I
Q.2 Write short answers to any FIVE (5) questions:
(i) Differentiate between base quantities and derived quantities.
(ii) Define plasma physics.
(iii) Write down two rules to identify the significant figures.
(iv) Differentiate between vectors and scalars.
(v) Define position.
(vi) Write down the mathematical form of the 3rd equation of motion.
(vii) Write down two disadvantages of friction.
(viii) Differentiate between centripetal and centrifugal force.
Q.3 Write short answers to any FIVE (5) questions:
(i) What is a solar cell? Write down its uses.
(ii) Why is an energy saver lamp better than an ordinary lamp?
(iii) Define power. Write down its SI unit.
(iv) Define force of gravitation.
(v) What is meant by artificial satellites? Write down their uses.
(vi) Why does the value of ‘g’ vary from place to place?
(vii) Write the difference between like and unlike parallel forces.
(viii) Define center of mass.
Q.4 Write short answers to any FIVE (5) questions:
(i) What is meant by elastic limit?
(ii) Define density and write its unit.
(iii) Write four differences between solid and gas states of matter.
(iv) What is meant by internal energy of a body?
(v) Define specific heat capacity.
(vi) What is meant by transfer of heat? Write its modes.
(vii) Upon which factors does radiation depend?
(viii) Why does land breeze blow in the night?
PART-II
Note: Attempt any TWO questions.
Q.5
(a) Derive the second equation of motion with the help of the speed-time graph.
(b) How much centripetal force is needed to make a body of mass 0.5 kg move in a circle of radius 50 cm with a speed of 3 m/s?
Q.6
(a) Explain any two states of equilibrium.
(b) Calculate the value of g at a height of 3600 km above the surface of the Earth.
Q.7
(a) Define and explain latent heat of fusion.
(b) A student presses her pin by her thumb with a force of 75 N. What would be the pressure under the thumb if the contact area is 1.5 cm²?