Physics (Full Book) Paper Class: IX (9th)

 

Objective Part

Subject: Physics(Full Book)                            Class: IX                                    Total Marks: 60

Name:_______________________                                                                           Date:_______________

1.  The least count of Vernier calipers is:      

   (a) 0.01mm               (b)  0.1mm   (c)0.001mm         (d).01m

2. The average speed of a cheetah is:     

(a)  60kmh^-1                (b)  75kmh^-1    (c)  70kmh^-1    (d)  80kmh^-1

3. A ball is thrown vertically upward. Its velocity at the highest point is: 

   (a)  -10 ms^-1           (b)  zero      (c)  10 ms^-2      (d)  none of them

4. Inertia depends upon:                  

    (a)  force               (b)  net force            (c)  mass       (d) velocity

5. Racing cars are made stable by:    

  (a) increasing their speed  (b) decreasing their mass (c) lowering their center of gravity    (d) decreasing their width

6. Earth’s gravitational force of attraction vanishes at:     

       (a)    6400km      (b)  infinity    (c)      42300 km  (d)  1000 km

7.  Which one of the following converts light energy into electrical energy? 

(a) Electric bulb        (b)  Electric generator   (c)   Photocell (d) Electric cell

8. What should be the approximate length of a glass tube to construct a water barometer?

  (a)  0.5 m          (b)   1 m  (c)     2.5 m              (d)   11m

9. SI unit of pressure is the pascal, which is equal to:

      (a)  10⁴ Nm^-2      (b)      1 Nm ^-2      ( c)  10² Nm^-2    (d) 10³ Nm^-2

10.    The relation between the coefficient of linear expansion and volume expansion is;

(a)  a  = 3b       (b)  b  = 3a         (c)  a  = 3/b     (d)  b = 3/a

11. Rooms are heated using gas heaters by:     

 (a)  Conduction only (b) Convection and radiation (c) Radiation only (d) Convection only

12.     The example of a bad conductor is:     

       (a)    Wool         (b) Copper     (c) gold   (d)  iron

                                 Subjective Part 

2.  Answer briefly any five (5) parts of the following. (5×2=10)

       I. Write a note on the Solar House Heating System.

      II. Write the importance of Wind Energy.

    III.  What is geothermal energy?

    IV. How energy is obtained from biomass?

     V. What is the mass-energy equation? Explain.

    VI.  How does electricity production from fossil fuels?

   VII.      Define Plasma. Discuss it as the fourth state of matter.

  VIII.      Define density and write down its mathematical form and unit.   

3.  Answer briefly any five (5) parts of the following. (5×2=10)

a)  How the value of ‘g’ varies with altitude?

d) What is meant by Stopwatch? Write its types and their working. 

e)  Differentiate between Distance and Displacement. 

f)  How is a vector represented?    

g)  How can you relate a force with the change of momentum of a body? 

4.  Write short answers to any FIVE (5) of the following questions. (5×2=10)

a)  Why does a cup of hot tea become cold after some time?

b) Define a Couple. How is the torque produced in the right body due to the couple? 

c)  Define the terms: 

 (1)   Force (ii)    Inertia      (iii) Momentum

d) From where does centripetal force F_c come during motion on a circular (curved)track?

e)  Define the line of action of force and moment arm.      

f)  What is meant by the Centre of Gravity?    

g)  What is a moment? Write its principle. 

             Note: Attempt any Two (2) questions. (2×9=18)

1.   (a) What do you mean by the pressure of liquids? Also, prove that P = rgh .

 (b) The mass of 200 cm³ of stone is 500 g. Find its density. 

2. (a) What are the features of a kinetic molecular model of matter? Explain different states of matter.   

      (b) A polar satellite is launched at 850 km above Earth. Find its orbital speed.

 (a) Define satellites. Find the orbital velocity of artificial satellites. 

        (b) Define kinetic energy. Derive its formula and Write its examples.