SLC Model Question Set 5 Science
Full Marks: 75
Pass Marks: 30
Physics
1. a) What is meant by free fall? Does parachute fall freely? Write with reason. Write any two differences between acceleration due to gravity (g) and gravitational constant (G). [1+1.5+1.5=4]
b) Give three alternative sources of energy. What are the two conditions of nuclear fusion reaction found in the sun? Write any two natural phenomena from which geothermal energy can be obtained. [1.5+1+1=3.5]
2. a) Define pressure. Prove the relation of pressure exerted by an object with its surface area and the applied force. By which two properties of liquid is it used in hydraulic brakes? [1+2+1=4]
b) Study the given figure and answer the following questions. [1+1+1.5=3.5]
i) What is the mass of stone in air?
ii) How much upthrust is exerted on the stone?
iii) Which principle is this experiment based on? Write the statement of the principle.
3. a) Define anomalous expansion of water. If water is cooled from 4oC to 0oC, what will be the change on its density? What amount of heat is required to raise the temperature of 20 kg of ice piece from -10oC to 70oC? (Specific heat capacity of ice is 21– J/kgoC and that of water is 4200 J/kgoC.) [1+1+2=4]
b) Write one function of ciliary muscle. What is meant by near point of eye? Draw a ray diagram showing how a compound microscope magnified the image of microorganism. [0.5+1+2=3.5]
4. a) Answer the following questions with the help of the diagrams. [1+1+1.5=3.5]
i) Calculate the total resistance in each circuit.
ii) Find the amount of current flowing in each.
iii) If R1 and R2 are bulbs, in which circuit the bulbs are brighter? Why?
b) What do you mean by 60W written in electric bulb? Miniature circuit breaker (MCB) is used in an electric path, why? Calculate the cost of electricity when 5 electric bulbs each of 100W run for 8 hours a day and two electric heaters each of 1000W run for 2 hours a day. (Cost of 1 unit = Rs. 7) [1+1+2=4]
Chemistry
5. a) What is s-block element? Give an example of it. Why is potassium more reactive than calcium although both of them lie in the same period? Write two drawbacks of Mendeleev’s periodic table. [1+0.5+1.5+1=4]
b) Draw a neat and labelled diagram showing the laboratory preparation of carbondioxide gas. Is the given hydrocarbon saturated or unsaturated? Name the compound formed by the reaction of the above hydrocarbon with saturated hydrocarbon. Also, give its name. [2+0.5+0.5+0.5=3.5]
CH3CH2CH=CH2
6. a) Gold is found in nature in pure state but not iron. Why? What is aquaregia? Write its reaction with gold in balanced equation form. [1+1+1.5=3.5]
b) What are the materials used in cement? Why lead crystal glass is called flute glass? Write any two reasons that plastics are useful. Mention two ways to control chemical pollution. [1+1+1+1=4]
Biology
7. a) Define reflex action. name the hormone secreted by male gonads. Mention one important function of this hormone. Answer the following questions based on the diagram:
i) Which process is shown in the diagram?
ii) What is to be done to let the plant grow towards the topmost face of the box? [1+0.5+1+0.5+1=4]
b) How does polio cause paralysis? Give any two preventive measures of AIDS. Give a difference between white blood cell and red blood cell on the basis of their functions. Name the compound which is formed by combination of haemoglobin and oxygen. [1+1+1+0.5=3.5]
8. a) How many chromosomes are there in human sperm and zygote? Why? Which type of cell division is indicated by the given diagram? Where does this type of cell division take place. Give its one importance. [2+0.5+0.5+1=4]
b) What is binary fission? Life cycle of fern plant is divided into how many groups? What are they? Draw a neat and labelled diagram of mushroom. [1+1+1.5=3.5]
9. a) Write the scientific name of maize and classify it. In the given pyramid, biomass of an ecosystem is given, name the ecosystem. What relation between producer and consumer is shown in the given pyramid? Name a bacteria that helps in nitrogen fixation. [0.5+1+0.5+1.5+0.5=4]
b) Why did Mendel select pea plant in his experiment? Give two reasons. Draw a chart to show the result of offspring upto F2 generation when pure round seeded pea plants and wrinkle seeded pea plants are first cross-pollinated and then self-pollinated. Also write the phenotypic ratio of offsprings in F2 generation. [1+2+0.5=3.5]
Geology and Astronomy
10. a) How is it known that there were dinosaurs in the earth in ancient time? In which period were they dominant? What is artificial green house? Give its one use. [1+0.5+1+1=3.5]
b) What happens when hydrogen is finished in the core of the sun? Write two differences between galaxy and constellation. [2+2=4]
