Science-HEMS School

HEMS SCHOOL
SLC Model Question: - 2
Time: 2:15 hrs. Sub: Science F.M:75


Attempt all the questions
Physics

1. a) Write two differences between acceleration due to gravity and gravitational constant. The probability of getting hurt is more when a man jumps from significant height, why? If the mass and radius of the moon is 7.2×1022kg and 1.7×108m respectively, what will be the mass of a man on the surface of the moon having weight of 107.9N on earth’s surface? (1+1+2.5=4.5)
b) What do you mean by energy crisis? “The increase in rate of petroleum products may help to prevent in energy crisis in near future.” Justify. (1+2=3)
2. a) What do you mean by hydrometer? Mention its use. If pistons A, B and C of apparatus given in the diagram are supposed to be frictionless, what is the area of the piston B? What force is exerted on piston C? (1+1+2.5=4.5)
b) What are the two factors, which does not affect up thrust of liquid? A hole at the bottom of a ship is more dangerous, why? (1+2=3)
3. a) A beaker completely filled with water of 40C will overflow on heating also and on cooling too, why? Calculate the amount of heat energy required to raise the temperature of 50kg of water from 100C to 600C. (1.5=2=3.5)
b) Draw a ray diagram to show the position and nature of the image of an object placed in between the principal focus and optical centre and convex lens. Write any two differences between human eyes and camera. (2+2=4)
4. a) State Flemings right hand rule. Write any two uses of using the colorful wire in house hold wiring. Differentiate between filament lamp and fluorescent lamp. (1+1+2=4)
b) Which type of transformer is given in the figure, explain why? Calculate the number of turns in secondary coil. (1+2.5=3.5)

Chemistry
5. a) What are inert gases? Which types of elements are kept in S block? What is the relation between atomic size and reactivity of elements of this group? Give reason. (1+1+1=3)
b) Sketch a labeled diagram of lab preparation of ammonia gas. Mention its principle reaction also. Differentiate between saturated and unsaturated hydrocarbons. (2.5+2=4.5)
6. a) Which metal is obtained from calverite ore? Write down the balanced formula equation of the chemical reaction between the extracted metal and aquaregia. Give two physical properties of that metal. (0.5+1+1+1=3.5)
b) Which glass will be formed if the mixture of silica and sodium carbonate is heated? Write its use. Phenolphthalein is used as an indicator why? Differentiate between polythene and Bakelite. (1+1+1+1=4)
Biology
7. a) Draw a figure of bacteriophage virus. Virus if of keen interest to the scientist, why? Define taxis. Classify the types of response/stimulation:-
i) Earthworm moves away from light.
ii) Antherozoids run towards malic acid secreted by archegonium. (1.5+1=1+1=4.5)
b) A person with lower amount of insulin in blood suffers from blood pressure, why? Mention any three differences between arteries and veins. (1.5+1.5)
8. a) What do you mean by crossing over? Draw a neat diagram of anaphase stage of mitosis. How is mitosis cell division different from meiosis cell division? (1+1+2=4)
b) All kind of mushroom is not edible, why? What do you mean by alternation of generation? Differentiate between primary and secondary mycelium. (1+1+1=3)
9. a) What do you mean by bio-geochemical cycle? Lighting are advantegeous for farmers, why? Classify ostrich with a special character.(1+1.5+1=3.5)
b) What do you mean by dominant characters? Draw a chart of Mendelian cross up to second filial generation between red flowers producing peas plant having auxiliary flowers with white flower producing pea plant having terminal flower. Show the phenotypic and genotypic ratio too. (Red colour of the flower and form the axial are dominant characters) (1+3=4)
Geology+Astronomy
10. a) Human beings evolved after millions of years before dinosaurs’ were evolved, why? Mention the era in which they were evolved. What is acid rain? Mention the causes of green house effect. (1.5+1+1+1=4.5)
b) What constellation? Name two satellites of Jupiter. Differentiate between galaxies and constellation. (1+1+1=3)