CLASS 9TH TERM 1 SCIENCE

I TERMINAL EXAMINATION

CLASS-IX

SUBJECT: - SCIENCE

Time: 3 hrs.                                                                                                                         MM: 80

SECTION –A

(PHYSICS)

1. What does the path of an object look like when it is in uniform motion?              (1 mark)
2. What do you mean by buoyancy?                                                                           (1 mark)
3. “A body having zero velocity will not necessarily have zero acceleration. Give an example to support this statement.                                                                          (1 mark)
4. Why does an object float or sink when placed on surface of water.                       (1 mark)
5. In what direction does the buoyant force on an object immersed in a liquid act?  (1 mark)
6. A car covers 2/5^th of distance with velocity V₁ and rest 3/5^th of distance with V₂, then calculate the average speed of car.                                                                        (2 marks)
7. A student is standing at a distance of 50 metres from the bus. As soon as the bus begins its motion with an acceleration of 1m/s², the student starts running towards the bus with a uniform velocity of u. Assuming motion to be along a straight road, calculate minimum value of u, so that the student is able to catch the bus.                                           (2 marks)
8. A particle travels 10 m in 1^st 5 sec and 10 m in next 3 seconds. Assuming constant acceleration, what is the distance traveled in last 2 seconds.                                 (2 marks)
9. A ball thrown vertically up reaches its maximum height h in time T, the proved that at time T/2, its height is 3h/4.                                                                                    (3 marks)
10. A particle moving in a straight line covers half the distance with speed of 3m/s. the other half of the distance is covered in 2 equal time interval with speed of 4.5 m/s and 7.5m/s respectively, then calculate the average speed of the particle.                             (3 marks)
11. Why is the weight of an object on the moon 1/6^th of its weight on the earth?      (3 marks)
12. If a bullet losses 1/mth part of its velocity when passes through one wooden plank then prove that the least number of planks(n) required to stop the bullet is given by

n=m²/2m-1.                                                                                                                  (5 marks)

SECTION-B

(BIOLOGY)

1. Identify the phylum of following organisms; Palammnaeus, anabas, hemidactylus, struthio camelus                                                                                                     (1 mark)
2. How do poriferan animals differ from coelenterate animals?                               (1 mark)
3. Name atleast 2 phylum in which there is no body cavity between epidermis and gastrodermis.                                                                                                         (1 mark)
4. Name 7-obligate taxon in the hierarchy of classification.                                    (1 mark)
5. Name atleast one cell –organelle responsible for energy transformation.            (1 mark)
6. What are the advantages of classifying organism?                                               (2 marks)
7. Explain the basis for grouping organisms into 5 kingdoms.                                 (2 marks)
8. Name atleast 2 characteristics of muscles found in Iris.                                       (2 marks)
9. What is black reaction? Describe it with significance.                                         (3 marks)
10. How hydrolytic enzymes are made. What are their functions?                             (3 marks)
11. Why mitochondria is known as power house of the cell                                       (3 marks)
12. Describe the section of a stem, with a labelled diagram.                                      (5 marks)
13. Compare the structures of different types of muscular tissues.                             (5 marks)

SECTION- C

(CHEMISTRY)

1. Why ice floats on water.                                                                                        (1 mark)
2. For any substance, why does the temperature remain constant during the change of state?                                                                                                                        (1 mark)
3. What types of clothes should we wear in summer?                                              (1 mark)
4. Define one atomic mass unit.                                                                               (1 mark)
5. calculate the mass of 0.5 mole of N atoms                                                          (1 mark)
6. What are polyatomic ions? Give examples                                                          (2marks)
7. Convert 20 g of water into moles.                                                                        (2marks)
8. What are the 2 important laws of chemical combination?                                    (2marks)
9. How would you confirm that a colourless liquid given to you is pure water?      (3marks)
10. How will you separate a mixture containing kerosene and petrol (difference in their boiling points is more than 25 C), which are miscible with each-other.              (3marks)
11. What type of mixtures is separated by the technique of crystallization? Give important characteristics of centrifugation technique.                                                           (3marks)

Differentiate between true solution, suspension and colloidal solution under 5 important parameters.