Science sample paper class 9

 CLASS 9
SUBJECT SCIENCE

mcq

1.       The numerical ratio of displacement to distance for a moving object is :

(a)    always less than 1                                          (b) equal to 1 or less than 1

(c) always more than 1                                         (d) equal to 1 or more than 1

2. What do you get by the product of mas and velocity:

(a) Force   (b)   Inertia   (c)    Momentum     (d)     Newton  

3. Which part of human ear converts sound vibrations into electrical signals:

  (a)  hammer    (b)    stirrup   (c)      Tympanic membrane    (d)   Cochlea

 

fill in the blanks

1.       ……… energy is possessed by running water.

2.       At the centre of the earth, the acceleration due to gravity is ………

 

1 marks q

1.       What does the odometer of an auto mobile measures?

2.       Define 1 hertz.

2 marks q

1.       State two effects of force.

2.       A person holds a body of mass 20kg over his head for 10sec. Has he done any work ?Justify your answer.

 

3 MARKS QUESTION

1.       Explain and prove the laws of conservation of energy.

2.       (a) Draw the sound waves for a low pitched  and the high pitched sound.

(b)   Write one use of ultrasonography.

(c)    Which wave property determines pitch?

4 marks question

1.       An observer far away from a railway station hears the train starting. The sound arrives both from the steel rails and through air with a time difference of 3.5 sec .How far is the railway station from the observer? The speed of sound in air and steel is 340m/s and 5130m/s respectively.

2.       A body weighs 63N on the surface of the earth .What is the gravitational force on it due to the earth at a height equal to half the radius of the earth?