9th Class Physics Past Paper 2019
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) What is meant by base quantities and base units?
(ii) Define scientific notation.
(iii) Write four names of laboratory safety equipments.
(iv) Define terminal velocity.
(v) Differentiate between vectors and scalars.
(vi) What is meant by breaking and skidding?
(vii) Write two methods of reducing friction.
(viii) Define centripetal force and write its formula.
Q.3 Write short answers to any FIVE (5) questions:
(i) Define unstable equilibrium.
(ii) What is the difference between like and unlike parallel forces?
(iii) How can the mass of the Earth be determined?
(iv) Define field force.
(v) Write the value of ‘G’ and its SI unit.
(vi) What do you mean by light energy?
(vii) Define potential energy and write its equation.
(viii) Define power and write its SI unit.
Q.4 Write short answers to any FIVE (5) questions:
(i) State Hooke’s Law.
(ii) State Young’s Modulus.
(iii) Define density and elasticity.
(iv) Define latent heat of fusion.
(v) Differentiate between heat and temperature.
(vi) Define thermal conductivity of a substance.
(vii) Write the difference between land and sea breezers.
(viii) Write two uses of good conductors.
PART-II
Note: Attempt any TWO questions.
Q.5
(a) Derive the first equation of motion with the help of a 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-1?
Q.6
(a) State and explain the conditions of equilibrium.
(b) A motorboat moves at a steady speed of 4 m/s-1. The water resistance acting on it is 4000 N. Calculate the power of its engine.
Q.7
(a) Define volume thermal expansion. Derive the equation:
(b) An object has weight 18 N in air. Its weight is found to be 11.4 N when immersed in water. Calculate its density. Can you guess the material of the object?