CBSE Class X Science Sample Paper 2

SUMMATIVE ASSESSMENT – II

Time: 3 Hrs Max. Marks: 90

General Instructions:

i) The question paper comprises of two sections, A & B. You are to attempt both the sections.

ii) All the questions are compulsory.

iii) There is no overall choice. However, internal choice has been provided in all the five questions of five marks category. Only one option in each question is to be attempted.

iv) All the questions of Section A and all sections of section B are to be attempted separately.

v) Question numbers 1 to 3 in Section A are 1 mark questions. These are to be answered in one word or one sentence.

vi) Question numbers 4 to 7 are 2 mark questions, to be answered in about 30 words.

vii) Question numbers 8 to 19 are 3 mark questions, to be answered in about 50 words.

viii) Question numbers 20 to 24 are 5 mark questions, to be answered in about 70 words.

ix) Question numbers 25 to 42 is Section B are Multiple Choice Questions on Practical Skills. Each question is 1 mark question. You are to choose one most appropriate response of the options provided to you.

Section-A

Q.1 List the three phenomenon of light responsible for formation of rainbow in the sky.

Q.2 Why is DNA copying an essential part of the process of reproduction?

Q.3 List any two common methods by which solid wastes of urban areas are disposed off.

Q.4 Why do we see stars twinkling whereas, where as planets do not twinkle?

Q.5 (i) What is meant by ‗power of accommodation of the eye‘?

(ii) How does the focal length of the eye lens change when we shift looking from a distant object to a nearby object?

Q.6 (i)Why are Coal and petroleum called fossil fuels?

(ii) Name the two elements which are present both in CNG and Petroleum?

Q.7 (i) What is the position of hydrogen in the model periodic table?

(ii) Where are isotopes of the same element having different atomic masses placed in the periodic table?

Q.8 Pure- breed pea plants A are crossed with pure breed pea plants B. It is found that the plants who look like A do not appear in F1 generation but B re-emerge in F2 generation. Which of the plants A and B: (i) tall,(ii) dwarf ? Give reason for your answer.

Q.9 A student sitting in the last row of the classroom is not able to read clearly the writing on the Blackboard:

(a) Name the type of defect of vision he is suffering from

(b) How can this defect be corrected ?

Q.10 (a) Name the compounds CH3COOH and identify its functional group.

(b) Give a chemical test to identify this compound.

(c) Name the gas evolved when this compound acts on solid carbonate. How would you

identify this gas.

Q.11(a) Explain the terms (i)Implantation (ii)Placenta

(b) What is the average duration of human pregnancy?

(c) What happens when the egg is not fertilized?

Q.12(a) A spherical mirror A forms an erect image of an object, a spherical mirror B forms erect as

well as inverted image of an object. Name the types of the spherical mirror A and B.

(b) What is the relation between the focal length and radius of curvature of a spherical mirror?

If the radius of a curvature of a spherical Mirror is 25 cm, what is the focal length?

Q.13 An organic compound ‗A‘ is an essential constituent of wine and beer. Oxidation of ‗A‘

yields An organic acid ‗B‘ which is present in vinegar. Name the compounds ‗A‘ and ‗B‘

and write their structural formula. What happens when ‗A‘ and ‗B‘ react in the presence of an

acid Catalyst? Write the chemical equation for the reaction.

Q.14 which of the following are homologous and which are the analogous? Give reasons

1. Trunk of the elephant and hand of a chimpanzee

2. Wing of a bird and wing of a bat.

3. Scales of fishes and shell of molluscs.

Q.15 Iit is desired to obtain an erect image of an object, using an concave mirror of focal length 20cm.

(i) What should be the range of the distance of object from the mirror?

(ii) Will the image be bigger or smaller than the object?

(iii) Draw a ray diagram to show the image formation in this case.

Q.16 ( a) Why does carbon form largest number of compounds?

(b) Why are some of these called saturated and other unsaturated compounds?

(c) Which of these is more reactive?

Q.17Write three advantages of constructing dams across the rivers?

Q.18 (a) State two effects produced by scattering of light by the atmosphere?

(b)Why are ‗danger‘ signal lights red in colour?

(c)What would the sky look like if the earth had no atmosphere?

Q.19The electronic configuration of these elements X, Y and Z are given below?

X 2

Y 2,6

Z 2,8,2

i)Which element belongs to second period ?

ii) Which element belongs to second group?

iii) Which element belongs to 18th group ?

Q.20 (a) What are the main reasons why human beings are over-exploiting the forests?

(b)What are the effects of damages?

(c)Names the different measures taken up for the conservation of forests?

Q.21:a)Why do we classify elements ?

b) What were the two criteria used by Mendeleev in creating his periodic table?

c) In Mendeleev‘s periodic table, why was there no mention of noble gasses like helium, neon

and argon?

d) Why did Mendeleev leave some gaps in his periodic table?

 

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