Term 1 - Summative Assessment

Science (Theory)

Question Paper Set - 2

Instructions:

1. The question paper consists of two sections, A and B. You are to attempt both the sections.
2. All questions are compulsory.
   
3. There is no overall choice. However, internal choice has been provided in all the three questions of five marks each. You have to attempt only one option in each question.
4. All questions in Section A and all questions in Section B are to be attempted separately.
5. Question numbers 1 to 4 in Section A carry 1 mark each. These are to be answered in one word or one sentence each.
   
6. Question numbers 5 to 13 carry 2 marks each. These are to be answered in about 30 words each.
7. Question numbers 14 to 22 carry 3 marks each. These are to be answered in about 50 words each.
8. Question numbers 23 to 25 carry 5 marks each. These are to be answered in about 70 words each.
9. Question numbers 26 to 41 in Section B are multiple-choice questions based on practical skills. Each question carries one mark. You are to choose the most appropriate answer from among the options given.

Section A

1. The plant growth in a crop slowed down, and the stems and older leaves turned yellow. What type of fertiliser should the famer use to safeguard his crop?
2. Identify the solute and solvent in tincture of iodine.
3. What is the nature of the displacement-time graph for a body moving with uniform velocity, starting from rest?
4. What is the shape of the orbit of a planet revolving around the sun?
5. If RBC’s are placed in a hypertonic solution and almonds in a hypotonic solution, what changes would you observe and why?
6. Which state of matter has:
   • Big inter-molecular spaces between particles
   • Highest diffusability
   • Highest fluidity
   • Weak inter-molecular forces of attraction between particles
7. Define the following terms: a. Concentration b. Solubility
8. Here is the velocity-time graph of an object. Find the displacement of the body between the third second and the fifth second.
   
9. A body starts from rest and gains a velocity of 6 m/s in 2 s of time. Find the acceleration of the body and its average velocity for the given time.
10. (a) Define momentum of a body.
    (b) A body of mass 5 kg moving at 2 m/s is stopped in 1 s. Find the retarding force on the body.
11. Given that the value of acceleration due to gravity on the surface of the moon is one-sixth of that on the surface of the earth, what is the mass of a body whose weight on the surface of the moon is equal to that of a 5 kg body on the surface of the earth?
12. Give an example of selective hybridisation between local and foreign breeds of cow to generate a new variety. Write any two characteristics taken into consideration.
13. What are the two tissues that prevent a plant from falling down on a windy day?
14. What is composite fish farming? Name the different species of fish used in it. How does it benefit the farmer?
15. What are the crops grown in the winter and rainy seasons called? What are the different crops that are grown in these seasons?
16. Define evaporation and explain the factors that affect the rate of evaporation.
17. a. What are the fourth and fifth states of matter? (1 mark)
    b. What symbols are used to represent following units? (i) kelvin (ii) pascal (1)
    c. Define sublimation. (1)
18. Find the acceleration, deceleration and displacement of the body whose velocity-time graph is as shown.
    
19. A net force of 20 N is applied on a wooden block at rest. If the mass of the block is 5 kg, find the acceleration on the block and its velocity at the end of 2 s.
20. Calculate the mass of the moon from the given data. The acceleration due to gravity on the surface of the moon is 1.67 m/s², the radius of the moon is 1.74 × 10⁶ m, and the universal gravitational constant is 6.67 x 10^-11 N m²/kg²
21. A stone is dropped from the top of a tower. Find its velocity and displacement at the end of 2 s from its fall. (Take
22. Identify the tissues and describe their functions:
    • Tissue with intercalated discs
    • Striated cells
    • Fluid tissue
23. Describe the process of fractional distillation with a diagram. What is the principle used? Give an example.
    Or
    • What are alloys? Give four examples. (2 marks)
    • Name the separation technique that you will use to separate:
      i. Oil and water ii. Cream from milk (1 mark)
    • A 26 per cent mass/mass solution is made by dissolving "x" grams of glucose in 74 grams of water. What is the value of "x"? (2 marks)
24. (a) Which would require a greater force - accelerating 2 kg body at 3 m/s2 or accelerating a 5 kg body at 1 m/s2? (2 marks)
    (b) A force of 24 N produces an acceleration of 3 m/s2 on a body of mass m1 and an acceleration of 2 m/s2 on a body of mass m2. What acceleration does it produce when applied on a combination of the two bodies? (3 marks)
    Or
    (a) Which of the following has more inertia - 10 kg cotton bale or 5 kg iron block? (2 marks)
    (b) A cube having side length 5 cm and density 40 g/cm3 is placed on a smooth surface. Two forces of magnitudes 30 N and 20 N are applied on the cube in opposite directions. What is the net acceleration on the block? (3 marks)
    
25. Draw a diagram of the human cell and label the following parts: (2½ marks)
    • Suicidal bags
    • Protein packaging unit
    • Brain of the cell
    • Powerhouse of the cell
    • Semi-permeable membrane
    Or
    • Draw and label the parts of a prokaryotic organism that does not have a well-defined nucleus.
    • Describe any three structures of the prokaryotic cell you drew in (a). How do the structures differ from those in a eukaryotic cell?
    Or

    Discuss the contribution of the following scientists to the field of biology:

    • Robert Hooke
    • Robert Brown
    • Leeuwenhoek
    • Rudolf Virchow
    • Watson and Crick

Section B

26. What is the fishing in saltwater regions like seas and oceans called?
    • Marine fisheries
    • Sea fisheries
    • Culture fisheries
    • Inland fisheries
27. A farmer's crop soaked in water for one day due to a heavy downpour. The farmer dried the grains under sunlight for three days, and later sprayed methyl bromide gas. This process of spraying methyl bromide gas is called:
    • Sublimation
    • Condensation
    • Vaporisation
    • Fumigation
28. Grey iron fillings and yellow sulphur powder on heating in a fusion tube form a black mass. Which of the following statements is true?
    • It represents a physical change
    • FeS disintegrates into Fe and S
    • Iron sulphide is formed in the reaction
    • Neither physical nor chemical change has taken place
29. On adding dilute sulphuric acid to the black mass in the test tube in question 28, a gas with what characteristic smell is obtained?
    • Pungent
    • No smell
    • Fishy odour
    • Rotten eggs
30. The gas obtained on adding sulphuric acid to the test tube in question 28 is:
    • Hydrogen chloride
    • Hydrogen sulphide
    • Hydrogen bromide
    • Sulphur dioxide
31. Chalk powder and sand on mixing form a(n):
    • Emulsion
    • Homogenous mixture
    • Heterogeneous mixture
    • Colloid
32. A mixture of acetone and water can be separated by:
    • Crystallisation
    • Distillation
    • Sublimation
    • Chromatography
33. The technique of centrifugation is based on the difference in:
    • Boiling points
    • Solubility
    • Density of particles
    • Volatility of components
34. Which of the following represents a chemical change?
    • Evaporation of petrol from a fuel tank
    • Casting of silver into medals
    • Crystallisation of sugar from sugar syrup
    • Rusting of iron
35. Soap, chalk powder, quick lime and soil are added to water in four different beakers and mixed thoroughly. Which of them would not leave a residue on a filter paper?
    • Soap solution
    • Chalk powder solution
    • Lime solution
    • Soil solution
36. Which of the following is the correct set of apparatus for the separation of sand and ammonium chloride?
    • Round bottomed flask, thermometer, water condenser, beaker
    • China dish, tripod stand, wire gauge, funnel, cotton plug
    • Glass jar, glass rod, paper strip
    • Beaker, tripod stand, wire gauge, watch glass
37. The sequence of path travelled by the vapours in a distillation set-up is:
    • Distillation flask, water condenser, receiver flask
    • Distillation flask, air condenser, receiver flask
    • Receiver flask, water condenser, distillation flask
    • Receiver flask, air condenser, distillation flask
38. From the diagram, which one of the statements below is incorrect?
    
    • Solvent molecules moved from low concentration to high concentration of solution
    • Water molecules moved from high concentration to low concentration of water
    • Solute molecules moved from high concentration to low concentration of solution
    • Water molecules moved from low concentration to high concentration of water
39. To which cell does this component of cell wall belong to?
    
    • Animal
    • Bacteria
    • Plant
    • Virus
40. Who expanded the cell theory by saying omniscellula-e-cellula?
    • Schleiden
    • Schwann
    • Rudolf Virchow
    • Purkinje
41. If the Golgi complexes are removed from a cell, what changes would you observe?
    • Endoplasmic reticulum does not synthesise proteins
    • Cell wall does not form
    • Lysosomes do not form
    • Cytoplasm does not form