MOdel Set 1
Attempt all the questions.
Physics
1. (a) Paratroopers are not hurt even if they jump from such a greater height. Why? The mass of the earth is 6x1024 kg and its radius is 6400 km what is the mass of a man weighing 977 Newton
(b) What is thermonuclear fusion reaction? Suggest any two alternative ways to prevent the energy crisis in the context of Nepal
2. (a) State Pascal's law. If piston A, B and C of the apparatus given in the diagram are friction less, what is the area of the piston B? What force is exerted on the piston C? [1+2 = 3]
(b) What is upthrust? Write down its SI unit. Why is it easier to lift a heavy stone in water? The volume of an ice block is 24,000 cm3 and its density is 0.9 gm/cm3. How much part of it remains above the surface of water when it is kept in water? [1+1+2.5 = 4.5]
3. (a) Define specific heat capacity of a substance. Write down its SI unit. Calculate specific heat capacity of water if 2.1 x 105 Joule of heat energy is required for 2 kg of water to raise its temperature from 25° c to 50° C? [1.5+2 = 3.5]
(b) A burning candle is placed at the distance of 6 cm from a convex lens having the focal length of 3 cm. Draw a ray diagram to show the formation of image. Write the characteristics of the image formed. [2+2 = 4]
4. (a) State Fleming’s Right Hand rule? Why Nitrogen gas is kept inside the filament lamp? Write any two differences between step-up and step-down transformer. [1.5+1+2=4.5]
(b) What type of transformer is used to play the radio with 12 volt in the electric line of 220 volt? A transformer is of 220 volt primary voltage and 770 turns of primary coil. How many turns of secondary coil are necessary in order to produce 120 volt from the transformer? [1+2=3]
Chemistry
5. (a) The electronic configuration of two elements is given below. Answer the following questions with the help of given electronic configuration. [1+1+1=3]
A: 1s2 2s2 2p6 3s2
B: 1s2 2s2 2p6 3s2 3p5
(i) Name the elements ‘A’ and ‘B’
(ii) Write molecular formula of the compound formed by the combination of these elements.
(iii) In which block of the periodic table do these elements belong to?
(b) Draw a labeled diagram to show the laboratory preparation of Ammonia. Write the name with structural formula of the compound formed due to the displacement of three hydrogen atoms of propane with three (OH) radicals. Give an example of displacement reaction. [2+1.5+1 = 4.5]
6. (a) Which metal is obtained from bauxite? Write the balanced chemical equation for the reaction between conc. hydrochloric acid and that metal. Specify whether the compound of the metal formed by this reaction is acid, base, or salt. [0.5+2+ 0.5= 3]
(b) How is ordinary glass prepared? Which metallic oxide is used to prepare blue glass? Name any Nitrogen containing chemical fertilizer. Differentiate between thermosetting plastic and thermoplastic in two points. [1.5+1+2 = 4.5]
Biology
7. (a) What is tropism? Why hormone is known as chemical messenger? Identify the types of taxis/ tropism of the following.
(i) Earthworm moves away from light.
(ii) Mosquitoes avoid insect repellent.
(iii) Aerobic bacteria moves towards oxygen.
(iv) Root grows towards soil. [1+1+2 = 4]
(b) In which cell of the blood does HIV affect? Write any two causes of AIDS. Why are arteries thicker than veins? If a person has blood pressure 140/100 mmHg, what does it mean? Write briefly. [0.5+1+1+1 = 3.5]
8. (a) The given diagrams are the anaphase of mitotic and meiosis I. Write two main differences between these two phases. Write two importance of mitotic cell division. [2+2 = 4]
(b) Both asexual and sexual reproduction is necessary to complete life cycle of fern. Clarify it. What is secondary mycelium in the life cycle of mushroom? Name any one poisonous mushroom. [2+1+0.5 = 3.5]
9. (a) Maize Deer Tiger
What is food chain? Classify maize and write down the special features of it. Describe the consequences that may occur if all the tigers are killed in that food chain. [1+2+1.5 = 4.5]
(b) What is mutation? Draw a chart to show both phenotype and genotype of the result obtained in the first and second filial generation of offspring of mouse having black color and white color according to Mendel's experimental result. [1+2 = 3]
Astronomy and Geology
10. (a) Why were living beings evolved after millions of years of the formation of the earth? Write any two effects of the increasing quantity of carbon dioxide gas in the atmosphere. Give its reason too. [1.5+2 = 3.5]
(b) Mention any three reasons of launching artificial satellites into the space. Why do some stars look much brighter in a clear sky night? The tail of a comet seems longer when it is near to sun while its tail seems shorter when it goes far. Give reason. [1.5+1+1.5 = 4]
The End
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