9th Class Physics Past Paper 2017
Note: Physics 1st Time Paper of 9th Class.
Group-I (Subjective) 40 Marks
Part– I
Q.2 Write short answers to any FIVE (5) questions:
(i) Differentiate between atomic physics and nuclear physics.
(ii) You are fifteen years old. Estimate your age in seconds.
(iii) What is meant by least count of vernier callipers?
(iv) Define uniform acceleration.
(v) What is the difference between scalars and vectors?
(vi) Differentiate between distance and displacement.
(vii) Define unit of force.
(viii) Write two advantages of friction.
Q3. Write short answers to any FIVE (5) questions:
(i) What is meant by resolution of forces?
(ii) Define axis of rotation.
(iii) Write the mathematical form of conditions of torque.
(iv) Define force of gravitation.
(v) State the law of gravitation.
(vi) Define satellites and give an example.
(vii) Define mechanical energy and give its unit.
(viii) What is power?
Q4. Write short answers to any FIVE (5) questions:
(i) State Hooke’s law.
(ii) Define plasma. What is its relation with electric current?
(iii) Define elasticity.
(iv) How many scales are there for the measurement of temperature? Write their names.
(v) What is meant by freezing point and melting point?
(vi) How does cross-sectional area of solid affect thermal conductivity?
(vii) Define convection.
(viii) What is meant by the greenhouse effect?
PART-II
Note: Attempt any TWO questions.
Q.5
(a) What do you mean by centripetal force? Derive the equation for centripetal force:
(b) A boy throws a ball vertically up. It returns to the ground after five seconds. Find:
(i) The maximum height reached by the ball.
(ii) The velocity with which the ball is thrown up.
Q.6
(a) Define both conditions for equilibrium. Describe each with one example.
(b) A body of mass 50 kg is raised to a height of 3 m. What is its potential energy? (g=10 m/s-2)
Q.7
(a) Describe and explain the kinetic molecular model of matter.
(b) Normal human body temperature is 98.6 °F. Convert it into Celsius and kelvin scale.