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Term 2 - 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 correct option from among those given.

Section A

  1. Define the SI unit of work.
  2. What kind of energy transformation takes place when a body is dropped from some height?
  3. Name two acids that are present in acid rain.
  4. Name the disease caused by water contaminated by mercury.
  5. a) How many atoms of sodium are there in a sample measuring 2 × 102 moles?

    b) Write the formula of nitrate of B2+ and aluminium salt of X-.

  6. Draw a sketch of Bohr’s model of the atom with five electrons in the “M” shell. Identify the element and also write its electronic configuration.
  7. The diagram given here shows characteristic features of two subkingdoms. Identify the subkingdoms, and write any two differences between them.

  8. Describe the class of warm-blooded animals in which the teeth are absent.
  9. State Archimedes’ principle.
  10. The relative density of iron is 7.7. what is the density in the SI system.
  11. What are ultrasonic waves? Name three animals that can hear ultrasonic waves.
  12. Describe any four methods of weathering of soil.
  13. What are the causes of water pollution?
  14. a) Calculate the molecular mass of C6H12O6 and P2O5.

    (Atomic mass: C = 12, H = 1, O = 16, P = 31) (1)

    b) Carbon and oxygen combine in the ratio of 3:8 by mass to form carbon dioxide. What

    mass of oxygen gas would be required to react completely with 36 g of carbon? (2)

  15. Calculate the mass of:

    (i) 1.5 moles of oxygen molecules

    (ii) 1.5 moles of oxygen atoms

    (iii) 3.011 × 1023 oxygen atoms (atomic mass: O = 16)

  16. Write any three differences between chordates and non-chordates.
  17. Describe any three infectious agents.
  18. Describe the mode of transmission of diseases through air, water and animals, with examples.
  19. How can we prevent infectious diseases?
  20. Derive the relation between the SI unit and the CGS unit for work.
  21. A boy standing in front of a cliff claps and hears an echo at the end of 3 s. If the speed of sound in air is 342 m/s, find the distance between the cliff and the boy.
  22. Observe the graphical representation of a wave given here and answer the questions that follow. The quantity plotted along the X-axis is time, and against the Y-axis is displacement of the vibrating particle in the wave.

    a) What is the nature of the wave?

    b) What is the wavelength of the wave?

    c) What is the quantity denoted by the letter "B" in the figure?

  23. a) Explain the term isotope with an example. (1)

    b) Of the three fundamental particles of an atom, which elementary particle(s) influences the following properties of an element? Give suitable reasons for your answer.

    i) The chemical identity of an atom (whether it is an atom of hydrogen or halogen)

    ii) The mass of an atom (2)

    c) What were the conclusions of Rutherford's alpha particle scattering experiment? (2)


    a) What sub-atomic particles make up the nucleus? What is their mass and charge? (2)

    b) What is the importance of isotopes in medicine? (1)

    c) In Rutherford’s scattering experiment, very few of the α-particles that hit the gold foil are deflected back. What does this suggest? (2)

  24. (a) What is the work done in increasing the velocity of a body of mass 2 kg from 4 m/s to 8 m/s? (3)

    (b) If the velocity of a body is doubled, then what is the percentage increase in its kinetic energy? (2)


    Name the kind of energy transformation that takes place in the following examples:

    a) Electric heater

    b) Dynamo

    c) Microphone

    d) Electric cell

    e) Headphone

  25. Describe the following processes:

    a. Biogeochemical cycle

    b. Greenhouse effect

    c. Formation of ozone layer

    d. Water cycle

    e. Decomposition


    Sketch a diagrammatic representation of the nitrogen cycle, and explain how nitrogen is replenished in the atmosphere.

  26. Section B

  27. Among cat, dog, lion and wolf, which animals belong to the same family?

    a. Dog, lion

    b. Cat, lion

    c. Cat, dog

    d. Dog, wolf

  28. What type of seed is shown here?

    a. Monocot

    b. Dicot

    c. Sporophyll

    d. Spore

  29. Here is an egg-laying animal. Identify the class to which it belongs.

    a. Reptilia

    b. Amphibia

    c. Aves

    d. Mammalia

  30. Organisms of which phylum show the notochord only at some stages during their lives?

    a. Protochordata

    b. Non-chordates

    c. Hemichordata

    d. Chordates

  31. Identify the feature in which these two animals are similar?

    Description: flying-birds_T5301.jpgDescription: bat.jpg

    a. Mammary glands

    b. Urinary bladder

    c. Diaphragm

    d. Four-chambered heart

  32. Subhash cut a fresh water plant into small pieces, and he observed that each of these fragments grew into a new plant. Identify the plant.

    a. Sargassum

    b. Spirogyra

    c. Chalamydomonas

    d. Rhizopus

  33. A cuboidal block of dimensions 10 cm × 6 cm × 4 cm is placed on a surface. It exerts maximum pressure when the side with the dimensions ____ is in contact with the surface.

    a. 10 cm × 4 cm

    b. 10 cm × 6 cm

    c. 6 cm × 4 cm

    d. Any dimension

  34. The SI unit for pressure is ___.

    a. dyn/cm2

    b. dyn/m2

    c. N/cm2

    d. N/m2

  35. A balloon filled with air is immersed forcibly and gradually into a water trough. The balloon experiences maximum upthrust when it is immersed:

    a. Up to one-fourth of its volume in water

    b. Up to half of its volume in water

    c. Up to three-fourths of its volume in water

    d. Completely in water

  36. The density of gold is 19.3 g/cm3. Its relative density is ____.

    a. 193

    b. 1.93

    c. 19.3

    d. 0.193

  37. The purity of gold in an ornament can be found, without destroying it, by using ____.

    a. The law of conservation of mass

    b. The principle of moments

    c. Archimedes’ principle

    d. Bernoulli's principle

  38. The relative density of silver is 10.8. Its density is:

    a. 108 kg/m3

    b. 1.08 g/m3

    c. 10.8 g/m3

    d. 10.8×103 kg/m3

  39. A man standing between two parallel cliffs fires a gun and hears two successive echoes at the end of 4 s and 6 s. The distance between the cliffs is ___m.

    (Speed of sound in air is 330 m/s.)

    a. 1600 m

    b. 1650 cm

    c. 1650 m

    d. 1590 m

  40. The frequency of a tuning fork is 256 Hz. The number of vibrations made by the fork in 10 s is _____.

    a. 25.6

    b. 256

    c. 2560

    d. 5120

  41. 40. In which of the following does sound travel faster?

    a. Railway track

    b. Tissue paper

    c. Garden water pipe

    d. Car tyre

  42. The Galton whistle, also called a dog whistle, produces sounds in the range:

    a. Below 20 Hz

    b. 20 Hz to 20 kHz

    c. Above 20 kHz

    d. 10 Hz to 20 Hz

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