10th Science Hot Model Paper 3
PART - A PHYSICS
I. Multiple Choice Questions: 4X1=4
1. The power of an electric bulb which works on 0.5 ampere current and 220 volts is
A] 440 W B] 110W
C] 11 W D] 22W
2. In the dispersion of white light by a prism, the colour that bends maximum is
A] red B] green
C] yellow D] violet
3. The device that can be used in series to control the current without changing the voltage is an
A] commutator B] galvanometer
C] rheostat D] voltmeter
4. When an oblique ray of light travels from water to air, it bends
A] away from the normal
B] towards the normal
C] in the direction of normal
D] in the direction of the incident ray
II. Answer the following questions. 4X1=4
5. Define resistivity of a conductor.
6. For what purpose does Fleming's left hand rule help?
7. If the magnification produced by a convex lens is +2, what is the nature of the image?
8. Name the type of the lens that always gives virtual and diminished image of an object.
III. Answer the following questions. 2X2=4
9. Write the circuit diagrams to show the parallel connection and also series connection of three resistors.
10. Draw the ray diagram showing the position of the image and object when the object is placed between 2F1 and F1 of a convex lens.
IV. Answer the following questions. 4X3=12
11. Imagine that you are producing small AC generators [dynamo] for bicycles. What are the factors that you must keep in mind to get maximum induced emf out of the generators that you produce?
OR
What is the principle of an electric motor? Why are permanent magnets not used in an electric fan or electric mixer and grinder?
12. Mention the advantages of using solar energy to produce electricity. What are the limitations of solar power plants?
OR
How is electricity produced from nuclear fuels? State the disadvantages of nuclear power reactors.
13. What is Tyndall effect? Give any two illustrations of Tyndall effect in our daily life.
14. State the laws of refraction. What is absolute refractive index?
OR
Observe the following figures and answer the questions.
Water is taken in three glass glass containers. A coin 'C" is kept in the water. 'CA' is the incident ray of light from the coin. 'MN' is the normal. Which of the figures are correct and which are incorrect? Give reasons for your answer.
V. Answer the following question: 1X4=4
15. Calculate the effective resistance in the two circuits shown below. Also calculate the total current in the each of the circuits.
VI. Answer the following question: 2X1=2
16. Which of the following is correct for an exothermic reaction?
A] Absorbs solar energy
B] Liberates heat energy
C] Absorbs heat energy
D] Absorbs electrical energy
17. The glowing of an electric bulb is not an example of a chemical reaction because
A] it emits heat
B] it emits light
C] it is an exothermic reaction
D] it does not form new substances
VII. Answer the following question: 2X1=2
18. Name the oxidising agent and reducing agent in the following reaction
MnO2 + 4HCI → MnCl2 + 2H20+ Cl2
19. Why does lime water turn milky when carbon dioxide is passed through it.
VIII. Answer the following questions: 3X2=6
20. What is the difference between ion and atom? Why do ionic compounds have hig! melting points?
OR
Draw the electron dot structure to show the formation of calcium chloride. (Atomic no. of Calcium =20, Chlorine = 17)
21. Draw the diagram of the apparatus used to show that an acid solution in water conducts electricity.
22. Draw the diagram of the apparatus used in the preparation of hydrogen gas and testing the soap bubbles filled with hydrogen by burning.
X. Answer the following questions: 2X3=6
23. Give reasons for the following
a] Toothpastes are generally basic in nature
b] Soil in areas near to the industries manufacturing sulphuric acid is acidic
c] The pH value of the contents in our stomach is generally less thar seven.
OR
When concentrated sulphuric acid is added to blue coloured copper sulphate crystals, the crystals become white. Why? Is it a chemical change or physical change? Give reasons for your answer.
24. Balance the following reactions
i] Pb(NO3)2 → PbO+NO2+O2
ii] Zn +HCI → ZnCl2+H2
iii] Fe2O3+ Al → Al2O3+ Fe
X. Answer the following question: 1X4=4
25. With reference to the modern periodic table, explain the following
a] groups
b] periods ] ionisation energy
d] metallic nature
XI. Answer the following question: 1X5=5
26. What are the functional groups? Write the structural arrangement of the following functional groups.
i] Carboxyl acids
ii] Ketones
iii] Aldehydes
iv] Alcohols
PART - C BIOLOGY
XII. Multiple Choice Questions: 2x1=2
27. One of these is responsible for maintaining body posture and balance
A] Cerebrum B] Cerebellum
C] Hypothalamus D] Mid brain
28. The function of the part labelled 'X' is
A] to transfer sperms to vagina
B] to nourish sperms
C] to produce sperms
D] to excrete urine
XIII. Answer the following questions: 2x1=2
29. How do non-biodegradable substances adversely affect the environment?
30. What is reflex action?
XIV. Answer the following questions: 3X2=6
31. Diagrammatically represent regeneration in planaria
32. Differentiate between aerobic and anaerobic respiration.
OR
Stomata play a very important role in the growth of plants. Explain
33. Diagrammatically represent mode of nutrition in amoeba
XV. Answer the following questions: 3X3=9
34. Explain the structure and function of human respiratory system
35. Differentiate between analogous and homologous organs with an example of each.
36. Construct a food web of your own
XVI. Answer the following questions: 2X4=8
37. Draw the diagram of human digestive system (human alimentary canal) and label
a] oesophagus
b] pancreas
38. List the functions of the following:
i] Ovaries
ii] Thyroid gland
ii] Pituitary gland
iv] Salivary gland
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