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Term 1 - Summative Assessment

Science (Theory)

Question Paper Set - 1

Time: 3 to 3 ½ hours
Max. Marks: 80


  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. Name one GM crop grown in India
  2. Classify the following into elements, compounds and mixtures: (i) Soil (ii) Sugar
  3. The motion of two objects “A” and “B” is represented by the displacement-time graph shown here. Which object is moving with less velocity?
  4. Why is the universal gravitational constant called so?
  5. If some raisins are kept in a hypotonic solution and grapes in a hypertonic solution, and left for a while, what change would you observe? Why?
  6. (a) What is dry ice? Why it is called so?
       (b) Suggest a method to liquefy atmospheric gases.(1+1)
  7. (a) What happens when an unsaturated solution of a solute is gradually cooled? (1)
       (b) (i) Name two elements that are solid at room temperature. (1/2)
        (ii) Name two elements that are liquid at room temperature. (1/2)
  8. (A) Define "acceleration".
    (B) Write the expression for the "average velocity" of a body when it is moving with uniform acceleration.
  9. Is the magnitude of displacement of a body always equal to the distance it has travelled? If not, reason out with an example.
  10. A 20 N force acting on a block of mass 5 kg placed on a rough surface produces an acceleration of 2 m s-2. Find the frictional force acting on the body.
  11. If the distance between two bodies is doubled, how does the gravitational force between them change?
  12. The outer layer of a branch of a tree consists of dead cells, whereas the stem of a young plant has live cells. How does the transformation occur?
  13. Continuous use of chemical fertilisers kills useful micro-organisms. What should the chemical fertilisers be replaced with to restore soil fertility?
  14. What do we call the unwanted plants in a field that reduce crop growth? Give any two examples. What are the methods to control them?
  15. List any six management practices of poultry farming.
  16. Convert the following temperatures in Kelvin into the Celsius scale.
    (i) 300 K (ii) 273 K (iii) 373K (iv) 333 K (v) 500 K (vi) 0 K
  17. (a) Write the units for the following physical quantities: (i) Pressure (ii) Density (1 mark)
    (b) Arrange solids, liquids and gases in increasing order of: (i) Kinetic energy (ii) Diffusability (iii) Inter-molecular forces (iv) Inter-molecular spaces (2 marks)
  18. The graph here represents the motion of a body moving with a uniform deceleration of 10 m/s2. Find the distance covered by the body before it comes to rest.
  19. A force acting on a body of mass 10 kg produces an acceleration of 5 m s-2. The same force produces an acceleration of 2 m s-2 when it acts on another body. Find the mass of the other body.
  20. A ball is projected vertically upwards with a velocity of 20 m/s. Find the (a) maximum height gained by the body (b) time for which the ball stays in the air. (Take g = 10 m/s2)
  21. A ball gains a maximum height of 'he'm when projected vertically upwards with a velocity 'u' m/s on the surface of the earth. To what maximum height can it be projected on the surface of the moon if thrown vertically upwards with the same velocity 'u' m/s?
  22. Differentiate between the two types of vascular tissue with any three features.
    • With the help of a labelled diagram, explain a method to separate a mixture of ammonium chloride and sodium chloride. (3 marks)
    • Differentiate between homogeneous and heterogeneous mixtures with examples. (2 marks)
    • Classify the following into physical and chemical changes:
    • (i) Corrosion of metals
      (ii) Photosynthesis
      (iii) Melting of ice (iv) Respiration (2 marks)

    • Classify the following into pure and impure substances:
    • (i) Silver (ii) Milk (1 mark)
    • Calculate the mass by mass percentage of a solution containing 35 grams of solute dissolved in 65 grams of a solvent whose density’s density is 1 g/cm3. (2 marks)
  23. (A) Explain the principles of physics involved in the following:
    1. A swimmer is able to go forward.
    2. Birds are able to fly. (2 marks)
    (B) If a stone is dropped from a certain height, it falls towards the earth due to gravitational attractive force. If the gravitational attractive force on the stone is the “action force”, what is the corresponding reaction force? (3 marks)
    (A) Show that conservation of momentum holds good even in the case of a head-on collision between two balls moving along the same line. (3 marks)
    (B) A sphere of mass 2 kg moving with a velocity of 5 m/s is involved in a collision with another sphere of mass 3 kg moving in the opposite direction with a velocity of 2 m/s. After the collision, if both the spheres move together, then find their common velocity. (2 marks)
  24. Draw a diagram of a hibiscus cell, and label the following organelles:

    • Control centre of the cell
    • Site of synthesis of food
    • Digests wastes and damaged organelles
    • Non-living permeable layer
    • Site of protein synthesis

    Discuss the contribution of the following scientists to the field of biology:
    • Robert Hooke
    • Robert Brown
    • Leeuwenhoek
    • Rudolf Virchow
    • Watson and Crick
  25. Section B

  26. Name the male cattle that are used for tilling and carting.
    • Diary animals
    • Milch animals
    • Draught animals
    • Dual purpose animals
  27. There has been low rainfall throughout the year in a village. What measures should the farmer take for better cropping?
    • Reduce tilling
    • Enrich the soil with humus to increase its water-holding capacity
    • Use drought-sensitive crops
    • Use early maturing varieties of crops
  28. A mixture of oil and water can be separated by:
    • Sublimation
    • Crystallisation
    • Chromatography
    • Separating funnel
    Questions 29 to 31 are based on the following information:
    Four samples A, B, C, D are prepared by adding a pinch of copper sulphate, a spatula of copper sulphate, a spatula of chalk powder, and some milk, to water respectively.
  29. Which one is the colloidal solution among them?
    • A
    • B
    • C
    • D
  30. Which of these will form a clear and transparent solution?
    • A
    • B
    • A and B
    • B and D
  31. Which of these will exhibit the Tyndall effect?
    • A and D
    • B and C
    • A and B
    • C and D
  32. Which of the following represents a chemical change?
    • Extraction of copper from copper pyrites
    • Distillation of water
    • Melting of wax
    • Dissolution of salt in water
  33. When a bottle of soda water is opened, carbon dioxide escapes, producing a fizz. This is due to:
    • Decrease in solubility on decreasing temperature
    • Decrease in solubility on increasing temperature
    • Decrease in solubility on decreasing pressure
    • Decrease in solubility on increasing temperaturepressure
  34. The sequence of steps for separating a mixture of salt, sand and camphor is:
    • Adding water, filtration, evaporation, sublimation
    • Adding water, filtration, sublimation, evaporation
    • Sublimation, adding water, filtration, evaporation
    • Sublimation, adding water, evaporation, filtration
  35. Which of the following is the correct set of apparatus for fractional distillation?
    • Round bottomed flask, thermometer, water condenser and beaker
    • Round bottomed flask, thermometer, water air condenser and beaker
    • Round bottomed flask, thermometer, fractionating column, water condenser and flask
    • Round bottomed flask, thermometer, fractionating column, air condenser and flask
  36. In the separation of dyes A and B by chromatography, component B has more solubility in the solvent. Which component will rise faster?
    • A
    • B
    • Both at the same speed
    • Separation of dyes is independent of the solubility in solvent
  37. Different components can be separated from petroleum by:
    • FiltrationA
    • Chromatography
    • Simple distillation
    • Fractional distillation
  38. Identify the two biologists who proposed the theory that all plants and animals are composed of cells.
    • Watson and Crick
    • Schleiden and Schwann
    • Knoll and Ruska
    • Robert Hooke and Robert Brown
  39. What happens when fresh grapes are placed in a concentrated solution of sugar?
    • The grapes shrink as water moves from the grapes to the sugar solution
    • The grapes burst as water moves from the sugar solution to the grapes
    • The grapes swell as water moves from the sugar solution to the grapes
    • The grapes turn flaccid as solute moves from the grapes to the sugar solution
  40. A magnified image of a specimen is observed through which part of a microscope?
    • Eye lens
    • Objective lens
    • Mirror
    • Condenser
  41. What is this highlighted structure in this cell called?
    • Plasmid
    • Nucleoid
    • Centriole
    • Centrosome
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