(Download) CBSE Class-10 2016-17 Sample Paper And Marking
Scheme (Science)
Time allowed: 03 Hours
Maximum Marks: 90
General Instructions:
(i) The question paper comprises two sections, A and B. You are
to attempt both the sections.
(ii) All questions are compulsory.
(iii) There is no choice in any of the question.
(iv) All questions of Section-A and B are to be attempted separately.
(v) Question numbers 1 to 3 in Section-A are one mark question. They are to be
answered in one word or in one sentence.
(vi) Question numbers 4 to 6 in Section- A are two marks questions. These are to
be answered in 30 words each.
(vii) Question numbers 7 to 18 in Section-A are three marks questions. These are
to be answered in about 50 words each.
(viii) Question numbers 19 to 24 in Section-A are 5 marks questions. These are
to be answered in 70 words each.
(ix) Question numbers 25 to 33 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.
(x) Question numbers 34 to 36 in Section B are two marks questions based on
practical skills. These are to be answered in brief.
Section A
1 Name the process of converting vegetable oil to vegetable
ghee. 1
2 List two secondary sexual characters of males that are
different from that of females.
3 Write the main function of Ozone in the upper atmosphere 1
4 When a concave mirror is placed facing the Sun, the Sun’s rays
converge to a point 10 cm from the mirror. Now, if you place a 2 cm long candles
flame 20 cm away on the principal axis of the mirror, where would you place a
screen to obtain the image of the candle? What would see the size of the image?
Draw a ray diagram to justify your answer.
5 If you find coliform bacteria in a sample of water collected
from a river, what would you conclude? Give reason for such kind of water
pollution.
6 Which natural resources are called the “biodiversity hot
spots”? How these hot spots maintain ecological balance?
7 What are isomers? “Isomers of the first three members of
alkane series are not possible”. Give reason to justify this statement and draw
structures of two isomers of butane, C4 H10.
8 An organic compound ‘X’ is a liquid at room temperature. It is
also a very good solvent and has the molecular formula C2 H6 O. on oxidation ‘X’
gives ‘Y’ which give, break effervescence on reacting with NaHCO3. X reacts with
Y in the presence of conc.H2SO4to give another compound ‘Z’ which has a pleasant
smell. Identify X, Y and Z. also write chemical equations to show the formation
of Y and Z.
9 An element ‘A’ belongs to 3rd period and 17th group of the
periodic table.
a) Write atomic member and electronic configuration of ‘A’
b) State whether A is a metal or a non – metal.
c) Write the nature of bond formed if A reacts with another element B of
electronic configuration 2, 8, 1.
d) Write the chemical formula of the compound formed.
10 Consider the following elements 4Be, 9F, 19K, 20Ca
a) Select the element having one election in the outer most
shell.
b) Select two elements of the same group.
c) Write the formula and state the nature of the Compound formed when the
element K reacts with an element X of electronic configuration 2, 8, 7.
11 Explain with the help of labelled diagrams the development
that takes place in each of the body parts of a Planaria where body is cut into
three pieces. None this process and give an example of an organism in which a
similar process can be observed.
12 List any four methods of contraception used by humans. How
does the use of three methods have a direct effect on the heath and prosperity
of a family?
