First Terminal Examination 2073

Class: 9 F.M. 75

Time: 2 hrs. 30 mins. Subject: Science P.M. 24

Attempt all the questions.

  1. a) What is physical quantity? Give examples of non-physical quantities. 2

b) Why is Newton called derived unit? 3

  1. a) What is vector quantity? Give two examples of scalars. 2

b) "A car is in a uniformly accelerated motion." What do you understand by the statement? 3

  1. a) State Newton's first law of motion. 2

b) The fruits fall down when the branches of a fruit tree are shaken, why?

3

  1. a) What is an ideal machine? 2

b) What do you understand by greater than one value of Mechanical Advantage (MA>1)? 3

  1. a) What do you mean by binomial system of nomenclature? 2

b) Hydra is classified in phylum coelenterate, why? 3

  1. a) What is skeleton? 2

b) Why is brain covered by cranium? Name the bones present in cranium. 3

  1. A brick is 25cm long, 10 cm wide and 6 cm thick. Calculate the area of the smallest face, the area of the largest face and the total area of all its face.

3

  1. Define 1 meter length. How would you find out the volume of irregular piece of stone? Explain. 3
  2. Prove that: v2 – u2 = 2as 4
  3. A bus of mass 1000 kg is moving with a velocity of 72 km/hr. The brakes are suddenly applied and is brought to rest in 8 secs. 4

Calculate:

i) the retardation

ii) the force applied by the brake to stop the bus

iii) the distance travelled in 4 seconds

  1. Study the given diagram and answer the following questions: 4

i) Claculate MA

ii) Calculate VR

iii) What can be done to increase MA?

iv) What happens if the fulcrum is shifted towards right?

  1. A body starts from rest and moves with a uniform acceleration of 2m/s2. How far can it travel in 10 seconds? 3
  2. A crowbar of length 3 m is used to lift a load of 400N applying an effort of 50N. How far should the fulcrum be placed from effort to keep the crowbar in balance? 4
  3. A book of volume 15 cm x 5 cm x 2 cm weighs 2 kg. If the book consists 250 pages, find the weight of one page. 3
  4. Why is there no perfect machine? Usually long spanners is used to unscrew a very tight knot, why? 3
  5. Classify: i) devil fish ii) hydra 3
  6. Write the characteristics features of phylum Arthropoda. 3
  7. Draw a labelled diagram of front view of human skull. 6
  8. Pelvic girdle of female is wider than that of male, why? 2

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