SAMPLE PAPER SA2 CLASS 10TH CBSE

Sample Paper – 2015

Class – X

SUBJECT – SCIENCE

Time: 2 ½ Hrs                                                             Maximum Marks: 60

General Instructions:

I)          The question paper comprises of two sections A and B. You are to attempt both the sections.

ii)          The candidates are advised to attempt all the questions of Section A separately and Section B separately.

iii)         All questions are compulsory.

iv)         There is no overall choice. However, internal choice has been provided in two questions of five marks category in Section A and one question of 2 marks category and one question of 3 marks category in Section B. You are to attempt only one option in such questions.

v)         Marks allocated to each question are indicated against it.

vi)         Questions 1 to 6 in Section A and 17 to19 in Section B are very short answer questions. These are to be answered in one word or one sentence only.

vii)        Questions 7 to 10 in Section A and 20 to24 in Section B are short answer questions. These are to be answered in about 30 - 40 words each.

viii)       Questions 11 to 14 in Section A and 25 to 26 in Section B are also short answer questions. These are to be answered in about 40 - 50 words each.

ix)         Questions 15, 16 in Section A and 27 in Section B are long answer questions. These are to be answered in about 70 words each.

SECTION A

1.         Name a Sodium Compound which is used for softening hard water?

2.         From the mirror equation ½ + ¼ = ²/_R show that the image in a plane mirror is as far behind the mirror as the object is in front of it?

3.         What is white light?

4.         Why pure gold is not used for making jewellery?

5.         What is glacial acetic acid?

6.         What is a clean fuel?

7.         Name four acid – base indicators & mention their colour changes?

8.         Light enters from air into a diamond which has a refractive index of 2.42 calculate the speed of light in diamond

9.         Draw the structure of graphite and diamond

10.       Resistance of uniform wire of length 30m & radius 0.1mm is measured as 21Ω. Calculate the resistivity of material of the wire?

11.       What is vital force? How it was broken?

12.       Briefly explain the observed blue colour of clear sky. What would have happen if there is no atmosphere on the earth?

13.       How do you think the tendency to lose electron will change in a group? How will this tendency change in a period?

14.       How is it that sun has been radiating continuously for million of years?

15.       Describe the method of balancing a chemical reaction by hit & trial method taking an example?

OR

            Give the method of extraction of metal available low in the reactivity series eg Hg & Cu

16.       Define magnification of image formed by lens find the formula for magnification using image formation as given below:

            (i)         Real image from convex lens

            (ii)        Virtual image from concave lens

            (iii)       Virtual image from convex lens

OR

            What is an electric motor? Draw a labeled diagram of an electric motor & name its important parts. Briefly explain its working?

SECTION – B

17.       What is meant by haploid?

18.       What is menopause?

19.       What are acquired traits?

20.       How information passes through nerves?

21.       What is meant by excretion & Osmoreulation?

22.       Name two type of drugs used in chemical method of pollution control?

23.       What factor could lead to rise of a new species?

24.       Write a note on Archeopteryx?

25.       Draw a labeled diagram of brain?

26.       What is transpiration? Give its two functions?

27.       Describe the mechanism of breathing in human beings?

OR

            What is the various evidence in favour of evolution?