Time : 2½ Hours Max. Marks : 60

The weightage to marks over different dimensions of the question paper shall be as under:

A. Weightage to Content/Subject units

S.No	Content Unit	Marks
1.	Chemical Substances	18
2.	World of living	16
3.	Effects of current	10
4.	Light	8
5.	Natural Resources	8

Total 60

B. Weightage to forms of Questions

Total 27 60

S.No.	Form of Questions	Marks for each question	No. of questions	Total Marks
1.	Very short answer type (VSA)	01	09	09
2.	Short answer type (SA I)	02	09	18
3.	Short answer type (SA II)	03	06	18
4.	Long answer type (LA)	05	03	15

C. Number of Sections

The question paper will have two sections A & B

D. Scheme of Options

There will be no overall choice. However, there is an internal choice in every question of five marks category.

E. Weightage to difficulty level of questions

S.No.	Estimated difficulty level of questions	Percentage
1.	Easy	15
2.	Average	70
3.	Difficult	15

F. Typology of Questions

In order to assess different abilities related to the subject, the question paper includes open-ended questions, drawing/illustrations based questions, communication-skill based questions and activity-based questions.

About 20% weightage has been assigned to questions testing higher order thinking skills of learners.

BLUE PRINT I X SCIENCE (THEORY)

Unit Form of Questions	VSA (1 Mark)	SA - I (2 Marks)	SA -II (3 Marks)	LA (5 Marks)	Total
Chemical Substances	3(3)	4(2)	6(2)	5(1)	18(8)
World of Living	2(2)	6(3)	3(1)	5(1)	16(7)
Effects of current	1(1)	4(2)	-	5(1)	10(4)
Light	2(2)	-	6(2)	-	8(4)
Natural Resources	1(1)	4(2)	3(1)	-	8(4)
Total	9(9)	18(9)	18(6)	15(3)	60(27)

Time : 2½ Hours Max. 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 are to be attempted separately.
5. Questions 1 to 6 in section A and 17 to 19 in section B are short question.These 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.

SECTION A

1. A ray of light LM is incident on a mirror as shown in the figure. The angle of incidence for this ray is the angle between it and the line joining two other points in the figure. Name these two points.
2. Metals generally occur in solid state. Name and write symbol of a metal that exists in liquid state at room temperature.
3. During summer season, a milkman usually adds a very small amount of baking soda to fresh milk. Give one reason.

4. The following table gives the values of refractive indices of a few media.

S.No.	1	2	3	4	5
Medium	Water	Crown Glass	Rock salt	Ruby	Diamond
Refractive Index	1.33	1.52	1.54	1.71	2.42

Use this table to give an example of (i) a medium pair so that light speeds up when it goes from one of these media to another. (ii) a medium pair so that light slows down when it goes from one of these media to another.

1. Why potato chips manufacturers fill the packet of chips with nitrogen gas?
2. Alloys are used in electrical heating devices rather than pure metals. Give one reason.
3. Tooth enamel is one of the hardest substances in our body. How does it undergo damage due to eating chocolates and sweets? What should we do to prevent it?
4. A student has been collecting silver coins and copper coins. One day she observed a black coating on silver coins and a green coating on copper coins. Which chemical phenomenon is responsible for these coatings? Write the chemical name of black and green coatings.
5. Two students perform the experiments on series and parallel combinations of two given resistors R and R₂ and plot the following V-I graphs.

1

Click Here For Full Paper

Source : http://cbse.nic.in