Physics 9th full book test

Pre Board   Examination Feb 2020

  Paper: Physics   Class: 9  Marks:12   Time: 15 mints

  

                        OBJECTIVE PART

     Tick   the correct answer.

 I : which one of the following is the smallest quantity?

(a)             0.01g (b) 2mg  (c) 100   (d) 500 ng

2: The measuring cylinder is used to measure:

(a)             mass (b) area  (c) volume (d) level of a liquid

3: Rate of doing work is called

(a) energy  (b) torque (c) power  (d) momentum

4: Falcon can fly at a speed of

(a) 100 km    (b) 120 km    (c) 200 km    (d) none

5: which of the following is the unit of momemtum ?          

(a) Nm               (b)   kgm (c)   Ns      (d)   none

6: which of the substances is the lightest one

(a) copper  (b) mercury  (c) aluminum (d) lead

7: The number of forces that can be added by head to tail rule

(a)        2           (b)     3        (c)     4        (d) any number

    8: Which of the following material has large specific heat ?

(a) copper  (b) ice  (c) water  (d) mercury 

9: the orbital speed of a low orbit satellite is :

(a) zero  (b) 8 m (c) 800 m (d)  8000 m

10: which of the following material has large value of   temprature

(a) aluminum (b) steel (c) glass (d) gold

11: In solids heat is transferred by :

(a) radiation (b) conduction (c) convection (d) absorption

12: In gasses heat is mainly transferred by

(a) molecular collision (b) conduction (C) convection (d)radiation

   

           Pre board  Examination Feb 2020

  Paper: Physics   Class: 9  Marks:12   Time: 1:45

          

                       SUBJECTIVE   PART-I

Q2. Write short answers of any five parts.           

        I.            What is the least count of vernier calipers. How it is measured.

      II.            Differentiate between molecular physics and atomic physics.

    III.            Define prefix with example.

    IV.            Differentiate between  distance and displacement.

      V.            What is meant by positive acceleration and negative acceleration.

    VI.            define Momentum and write its SI unit.

  VII.            Why does oiling the moving parts of a machine lowers friction?

VIII.            When a gun is fired, it recoils, Why?

Q3. Write short answers of any five parts.

        I.            What is meant by center of gravity.

      II.            Define rigid body.

    III.            Why the height of vehicles is kept as low as possible?

    IV.            State law of gravitation with its formula.

      V.            Why does the value of 'g' vary from place to place?

    VI.            Define kinetic energy and write its formula.

  VII.            What is the second name of solar cell and how it is made.

VIII.            A stone of 500g is thrown up with a velocity of 15 m .Find its kinetic energy.

Q4. Write short answers of any five parts.

        I.            Define pressure .What is the unit of pressure in SI system.

      II.            State Pascal's law.

    III.            Define Young's modulus.

    IV.            What is clinical thermometer?

      V.            Define specific heat capacity and write its  mathematically form.

    VI.            Differentiate between land and sea breezes.

  VII.            What is green house effects.

VIII.            Define convection.

                                                      

 

                                             PART-II

  Note:   Attempt any two questions.

Q5. (a) Derive third equation of motion with the help of graph.

        (b) A body has weight 20 Newton how much force is required to move it                

              vertically upward with an acceleration of 2 meter per second square.

Q6. (a) Define kinetic energy and derive its equation.

       (b) A force of hundred newton is applied perpendicularly on a spanner at a

            distance of of 10 cm from nut. Find the torque produced by the force.

Q7. (a)State and explain Archimedes principle.

       (b) An electric heater supplies heat at 1000 joules per second. How much time 

             is required to raise the temperature of 200 g of water from 20 to 90?