10th model papers physics
Answers
HAY friend Physical Sciences
Time: 2.45 Minutes. Parts A & B Max. Marks: 40
Instructions:
i) In the time duration of 2 hours 45 minutes, 15 minutes of time is allotted to read and understand the question paper.
ii) Answer the questions under Part 'A' on a separate answer book.
iii) Write the answers to the questions under part 'B' on the question paper itself and attach it to the answer book of part 'A'.
Part - A
SECTION - I
Note: 1. Answer all the questions.
2. Each question carries ONE mark.
3. Answer each question in 1 or 2 sentences. (4 × 1 = 4 M)
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1. How does eye lens change its focal length?
2. Find the absolute refractive index of water, if its critical angle is 48.5° (sin 48.5° = 0.75)
3. How do you appreciate the role of esters in everyday life?
4. Write the names of any two compounds which have ionic bond.
SECTION - II
Note: 1. Answer all the questions.
2. Answer each question in 4 or 5 sentences.
3. Each question carries TWO marks. (5 × 2 = 10 M)
5. i) CaCO3 (s) → CaO (s) + CO2 (g)
ii) 2 AgBr (s) → 2 Ag (s) + Br2 (g)
Mention the types of reactions to which the above equations belong. Also mention
which of them is a photo chemical reaction.
6. Between a neutral atom and its cation which has bigger size? Why?
7. Why Dobereiner, Newlands and Mandeleeff were not 100% succesful in the classification of elements? Why the modern table is relatively a better classification? Predict the reason.
8. Draw the diagram that explains the formation of an image by a plane mirror.
9. What is the value of 1 KWH in Joules?
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SECTION - III
Note: 1. Answer all the questions.
2. Each question carries FOUR marks.
3. Answer each question in 8 to 10 sentences.
4. There is internal choice for each question. Only one option from each question is to be attempted. (4 × 4 = 16 M)
10. Revathi said that presence of air and water are essential for corrosion. Suggest an experiment to prove Revathi's statement. (Or)
Mention different types of chemical decomposition reactions. Which method is suitable for the decomposition of water? Draw a neat diagram of it.
11. How do you verify experimentally that the focal length of convex lens is increased when it is kept in water?
(Or)
Gowri observed that petrol kept in a vessel disappears after sometime. Rani heated water in a beaker and turned into water vapour. How would you distinguish between these two processes?
12. Explain the formation of double bond and triple bond according to Lewis theory.
(Or)
How do you explain the process of artificial ripening of fruits by ethylene?
13. The resistance of 5 Ω, 15 Ω, 20 Ω, and 10 Ω are connected as shown in the figure. Find the resultant resistance of the circuit.