kvsroernakulam.nic.in Class X Science Sample Question Paper : Kendriya Vidyalaya Sangathan
Name of the Organisation : Kendriya Vidyalaya Sangathan, Ernakulam
Class : Class X
Year : 2013-14
Subject : Science
Document Type : Sample Question Paper
Website : https://roernakulam.kvs.gov.in/
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Sample Paper1 : https://www.pdfquestion.in/uploads/22153-Science1.pdf
Sample Paper2 : https://www.pdfquestion.in/uploads/22153-Science2.pdf
Sample Paper3 : https://www.pdfquestion.in/uploads/22153-Science3.pdf
Science Sample Question Paper :
General Instructions :
i) The question paper comprises of two Sections,A and B. You are to attempt both sections.
ii) All questions are compulsory.
Related : Kendriya Vidyalaya Sangathan Class X English Sample Question Paper : www.pdfquestion.in/22145.html
iii) There is no overall choice. However internal choice has been provided in Five marks category.
iv) All questions of Section –A and all questions of Section -B are to be attempted separately.
v) Question numbers 1 to 3 in Section-A are one mark questions. These are to be answered in one word or in one sentence.
vi) Question numbers 4 to 7 in Section –A are two marks questions. These are to be answered in about 30 words each.
vii) Question numbers 8 to 19 in Section-A are three marks questions. These are to be answered in about 50 words each.
viii) Question numbers 20 to 24 in Section-A are five marks questions. These are to be answered in 70 words each.
ix) Question numbers 25 to 42 in Section -B are multiple choice questions based on practical skills. Each question is a one mark question. You are to select one most appropriate response out of the four provided to you.
Section –A :
1. In a food chain consisting of grass, frog, bird and insects, where will be the concentration of the harmful chemicals maximum?
2. A small candle 2.5 in size is placed at 27 cm in front of concave mirror of radius of curvature 36 cm. If the candle is moved close to the mirror how will the screen has to be moved?
3. Write the formula of the sulphate of the element with atomic number 13.
4. What is the role of seminal vesicles and prostate gland in Human male reproductive system?
5. Fossil fuels are being increasingly used as source of energy. List reasons for replacing these by alternative sources of energy.
6. What are Isomers? State two properties of carbon which lead to the huge number of carbon compound.
7. Explain the three R’s to save the environment with examples.
8. (a) Which two criteria did Mendeleev use to classify the elements in his periodic table?
(b) State Mendeleev’s periodic law.
(c) Why is it not possible to give a fixed position to hydrogen in Mendeleev’s periodic table?
9. (a) Give the structural difference between saturated and unsaturated hydrocarbons and also give one example of each.
(b) What happens when ethanol is heated with concentrated H2SO4 at 443 K? Give the chemical reaction.
10. A) Properties of the element are given below : Where would you locate the following elements in the periodic table.
a. A soft metal stored under kerosene oil.
b. An element with variable valency(more than one) stored under water.
c. An element which is tetra valent in organic chemistry.
d. An element which is an inert gas with atomic number 2.
B) Why does atomic size decreases from left to right in a period and increases down the group
11. Write the full form of DNA and briefly explain DNA copying and its significance.
12. Why are bacteria and fungi called decomposers? List any two advantages of decomposers to the environment.
13. Draw a neat diagram of human female reproductive system and label the following parts :
A) The site of fertilization.
B) The part which is responsible for providing shelter to the growing embryo.
C) The part in which ovum formation takes place.
14. Define the following with one example for each :
A) Genetic Drift. B) Natural selection. C) Reproductive isolation.
15. A) Give the laws of Refraction of Light.
B) Two mediums A and B with refractive index 1.33 and 1.50 are given. In which case
i. Bending of light is more.
ii. Speed of light is more. Justify your answer.
16. A) Define Magnification.
B) A convex lens of focal length 20 cm produces 3 times magnified real image of an object. Find the position of the object
17. A) Write the differences between real and virtual image
B) Why convex mirror is used as rear view mirror
18. A student is not able to see clearly the questions written on the black board placed at a distance of 5 m from him.
A) Name the defect of vision he is suffering from
B) What are the causes for this defect.
C) With the help of labelled ray diagrams show the defect and how this can be corrected?
19. ‘Variation is beneficial to the species but not necessarily for the individual.’ Give three reasons to support it.
20. A) Draw a diagram showing germination of pollen on stigma of a flower.
B) Label pollen grain, male germ cells, pollen tube and female germ cell in the above diagram.
C) Explain the process of fertilization in plants.