cbse.nic.in : Class X Science Question Paper Sample Central Board Of Secondary Education

Board : Central Board Of Secondary Education
Exam : Class X
Subject : Science
Document Type : Sample Question Paper
Website : cbse.nic.in

Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/cbse.nic.in/7041-sqpms-science-theory-x-paper2-2010.pdf

CBSE Science Class X Sample Question Paper

X – (Theory)
Time:2½ Hours
Max. Marks: 60

Related : Central Board Of Secondary Education Class IX Mathematics Question Paper Sample : www.pdfquestion.in/7042.html

General Instructions

1. The question paper comprises of two sections A and B. You have to attempt both the sections.
2. All questions are compulsory.
3. There is no overall choice. However, internal choice has been provided in all the three questions of five marks category. Only one option in such questions is to be attempted.
4. All questions of section A and all questions of section B to be attempted separately.
5. Questions 1 to 6 in section A and 19 to 21 in section B are very short answer questions. These carry one mark each.

6. Questions 7 to 12 in section A and 22 to 24 in section B are short answer type questions and carry two marks each.
7. Questions 13 to 16 in section A and 25 to 26 in section B are also short answer type questions and carry three marks each.
8. Questions 17 and 18 in section A and question 27 in section B are long answer type questions and carry five marks each.

Sample Questions

Section A :
1. A ray of light AM is incident on a spherical mirror as shown in the diagram. Redraw the diagram on the answer sheet and show the path of reflected ray.
1. A metal M belongs to 13th group in the modern periodic table. Write the valency of the metal.
2. The ciliary muscles of a normal eye are in their (i) most relaxed (ii) most contracted state. In which of the two cases is the focal length of the eye-lens more?
3. Tap water conducts electricity whereas distilled water does not. Why?
4. An electric geyser has the ratings 2000W, 220V marked on it. What should be the minimum rating, in whole number of a fuse wire, that may be required for safe use with this geyser?
5. Kerosene burns with a sooty flame. Is it a saturated or an un saturated compound?
6. Two metallic wires A and B of the same material are connected in parallel. Wire A has length l and radius r, wire B has a length 2l and radius 2r. Calculate the ratio of the equivalent resistance in parallel combination and the resistance of wire A.
7. A student performs an experiment to study the magnetic effect of current around a current carrying straight conductor. He reports that
(i) for a given battery, the degree of deflection of a N – pole decreases when the compass is kept at a point farther away from the conductor.
(ii) the direction of deflection of the north pole of a compass needle kept at a given point near the conductor remains unaffected even when the terminals of the same battery sending current in the wire are inter changed.
Which of the above observations of the student appears to be wrong and why?
8. A housewife wanted her house to be whitewashed. She bought 10kg of quick lime from the market and added it to 30 litres of water. On adding lime to water she noticed that the water appeared to be boiling even when it was not being heated. Give reason for her observation. Write the corresponding chemical equation and name the product formed.
9. Write the electron- dot structure for sodium and chlorine atoms. How do these form a chemical bond? Name the type of bond so formed. Why does a compound so formed have high melting point?
10. Why are many thermal power plants set up near coal or oil fields?
11. How is charcoal obtained from wood? Write two advantages of using charcoal as a fuel over wood?
12. Two carbon compounds A and B have the molecular formula C3H8 and C3 H6 respectively. Which one of the two is most likely to show addition reaction? Justify your answer. Explain with the help of a chemical equation, how an addition reaction is useful in vegetable ghee industry.
13. A beam of white light falling on a glass prism gets split up into seven colours marked 1 to 7 as shown in the diagram. A student makes the following statements about the spectrum observed on the screen.
14. A beam of white light falling on a glass prism gets split up into seven colours marked 1 to 7 as shown in the diagram. A student makes the following statements about the spectrum observed on the screen.
(a) The colours at positions marked 3 and 5 are similar to the colour of the sky and the colour of gold metal respectively. Is the above statement made by the student correct or incorrect? Justify.
(b) Which two positions correspond closely to the colour of
(i) a brinjal
(ii) ‘danger’ or stop signal lights?
15. Baking soda is used in small amount in making bread and cake. It helps to make these soft and spongy. An aqueous solution of baking soda turns red litmus blue.