Science sample X-2009-b


Time allowed: 2 & 1/2 hours; Maximum Marks: 60

General Instructions:
1) The question paper comprises of two Sections A and B. You  are 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 are to be attempted separately.
5) Questions 1 to 6 Section A and 17 to 19 in Section B are short questions. These questions carry one mark each.
6) Questions 7 to 10 in Section A and 20 to 24 in Section B are short answer type questions and carry two marks each.
7) Questions 11 to 14 in Section A and 25 to 26 in Section B are also short answer type questions and carry three marks each.
8) Questions 15 and 16 in Section A and question 27 in Section B are long answer type questions and carry five marks each.


Question 1

When water is added to quick lime, heat is evolved or absorbed?

Question 2

What do you observe when a burning splinter is brought near the gas jar filled with hydrogen?

Question 3

Define the term metalloid.

Question 4

What is the radius of curvature of a spherical mirror?

Question 5

What is the most convenient way of describing a magnetic field?

Question 6

What is an ohmic resistor?

Question 7

Why is it necessary to balance a chemical equation?

Question 8

Write the use of pH in our digestive system.

Question 9

What do you mean by principal focus and focal length of a concave mirror?    Draw a diagram representing them.

Question 10

A current through a horizontal power line flows in east to west direction. What is the direction of magnetic field at a point directly below it and at a point directly above it?

Question 11

Name the elements present in Group 1 of the modern periodic table.

Question 12

Define the term hydrocarbons. What types of compounds are included in it?

Question 13

What do you mean by resistance of a conductor? Define its unit.

Question 14

(i) Draw a diagram to show, how two resistance R1 and R2 are connected in series?

(ii) In a circuit if the two resistances of 5 Ω and 10 Ω are connected in series, how does the current passing through the two resistors compare?

Question 15

With the help of an activity show that reactive metals can displace less reactive metals from their compounds in their aqueous solutions.

Question 16

With the help of an activity show that metals are good conductors of heat as well as have high melting points.


Question 17

What is the mode of nutrition in Plasmodium?

Question 18

What is the source of energy in natural ecosystem?

Question 19

Where do we find cerebrospinal fluid? Give its function.

Question 20

What is wind? What is the main factor responsible for its formation?

Question 21

Briefly explain the mechanism of nuclear fission process.

Question 22

What is the composition of nervous system in higher vertebrates?

Question 23

What are analogous organs, give example?

Question 24

Give four conditions necessary for Photosynthesis.

Question 25

Describe the human digestive system.

Question 26

Describe an experiment to prove that light is essential for photosynthesis.

Question 27

Describe asexual reproduction in Amoeba.


(i) How do chlorofluorocarbons (CFC’s) enter the atmosphere and how do they affect humans?

(ii) What is incineration? How it helps in reducing the wastes?