Term 1 - Summative Assessment
Question Paper Set - 2
Time: 3 to 3 ½ hours
Max. Marks: 80
- The question paper consists of two sections, A and B. You are to attempt both the sections.
- All questions are compulsory.
- 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.
- All questions in Section A and all questions in Section B are to be attempted separately.
- Question numbers 1 to 4 in Section A carry 1 mark each. These are to be answered in one word or one sentence each.
- Question numbers 5 to 13 carry 2 marks each. These are to be answered in about 30 words each.
- Question numbers 14 to 22 carry 3 marks each. These are to be answered in about 50 words each.
- Question numbers 23 to 25 carry 5 marks each. These are to be answered in about 70 words each.
- 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.
- 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?
- Identify the solute and solvent in tincture of iodine.
- What is the nature of the displacement-time graph for a body moving with uniform velocity, starting from rest?
- What is the shape of the orbit of a planet revolving around the sun?
- If RBC’s are placed in a hypertonic solution and almonds in a hypotonic solution, what changes would you observe and why?
- Which state of matter has:
- Big inter-molecular spaces between particles
- Highest diffusability
- Highest fluidity
- Weak inter-molecular forces of attraction between particles
- Define the following terms: a. Concentration b. Solubility
- Here is the velocity-time graph of an object. Find the displacement of the body between the third second and the fifth second.
- 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.
- (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.
- 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?
- 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.
- What are the two tissues that prevent a plant from falling down on a windy day?
- What is composite fish farming? Name the different species of fish used in it. How does it benefit the farmer?
- What are the crops grown in the winter and rainy seasons called? What are the different crops that are grown in these seasons?
- Define evaporation and explain the factors that affect the rate of evaporation.
- 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)
- Find the acceleration, deceleration and displacement of the body whose velocity-time graph is as shown.
- 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.
- 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
- 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
- Identify the tissues and describe their functions:
- Tissue with intercalated discs
- Striated cells
- Fluid tissue
- Describe the process of fractional distillation with a diagram. What is the principle used? Give an example.
- 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)
(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)
(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)
- 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
- 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?
Discuss the contribution of the following scientists to the field of biology:
- Robert Hooke
- Robert Brown
- Rudolf Virchow
- Watson and Crick
- What is the fishing in saltwater regions like seas and oceans called?
- Marine fisheries
- Sea fisheries
- Culture fisheries
- Inland fisheries
- 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:
- 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
- On adding dilute sulphuric acid to the black mass in the test tube in question 28, a gas with what characteristic smell is obtained?
- No smell
- Fishy odour
- Rotten eggs
- The gas obtained on adding sulphuric acid to the test tube in question 28 is:
- Hydrogen chloride
- Hydrogen sulphide
- Hydrogen bromide
- Sulphur dioxide
- Chalk powder and sand on mixing form a(n):
- Homogenous mixture
- Heterogeneous mixture
- A mixture of acetone and water can be separated by:
- The technique of centrifugation is based on the difference in:
- Boiling points
- Density of particles
- Volatility of components
- 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
- 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
- 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
- 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
- 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
- To which cell does this component of cell wall belong to?
- Who expanded the cell theory by saying omniscellula-e-cellula?
- Rudolf Virchow
- 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