MBOSE Class 10 Question Paper 2020 for Science and Technology Old Course

Total No. of Printed Pages—12
X/20/S & T (O)

2020

SCIENCE AND TECHNOLOGY

( Old Course )

( FOR CANDIDATES WITH PRACTICAL MARKS )

Full Marks : 80
Pass Marks : 24

( FOR CANDIDATES WITHOUT PRACTICAL MARKS )

Full Marks : 100
Pass Marks : 30
Time : 3 hours

( FOR ALL CATEGORIES OF CANDIDATES )

General Instructions :

(i) The candidates are advised to attempt all questions
accordingly.

(ii) Marks allocated to every question are indicated against
each.

(iii) Question Nos. 1 to 39 are to be answered by all
Candidates.

(iv) Question No. 40 is to be answered by Candidates
without Practical marks.

/62 [ P.T.O.

( 2 )

SECTION—A

( PHYSICS )
( Marks : 26 )

Choose and write the correct answers from the following : 1×3=3

1. The ray of light which falls on the mirror’s reflecting
surface is
(A) reflected ray
(B) normal
(C) incident ray
(D) refracted ray 1

2. A freely suspended magnet always point in the
(A) east-west direction
(B) north-south direction
(C) east-south direction
(D) north-west direction 1

3. The coil of the electric kettle is made of
(A) copper
(B) tungsten
(C) aluminium
(D) nichrome 1

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( 3 )

Answer the following questions in one word or one sentence
each : 1×3=3
4. What is the speed of light waves in vacuum? 1

5. Define electric power. 1

6. Name two types of electric motor. 1

Answer the following short-answer type questions in 30–40
words each : 2×3=6
7. Either
(a) Give any two differences between real image and
virtual image. 2
Or
(b) State the two laws of refraction of light. 2

8. What is myopia? How can it be corrected? 1+1=2

9. (a) What is the main disadvantage of a series circuit? 1
(b) Resistances of 8 , 10  and 5  are connected in
series. Calculate the equivalent resistance of the
circuit. 1

Answer the following short-answer type questions in 50–60
words each : 3×3=9
10. (a) Name the instrument used to measure (i) electric
current and (ii) potential difference in a circuit. ½+½=1
(b) State the four factors that are responsible for the
formation of a rainbow. ½×4=2

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( 4 )

11. (a) What is an electric motor? 1
(b) What are the advantages of alternating current over
direct current? (Give any two points). 1+1=2

12. Either
(a) What is meant by magnetic effect of current? 1
(b) Write any two properties of a magnet. 2
Or
(c) Write the mathematical relationship between the
focal length f and radius of curvature R of a
spherical mirror. 1
(d) The radius of curvature of a spherical mirror is
20 cm. What is its focal length? 2

Answer the following long-answer type questions in 70–80
words : 5

13. Either
(a) Define near point of the eye. 1
(b) What is presbyopia? How can it be corrected? 1½+½=2
(c) Name and explain about any two safety measures
commonly used in electric circuits and appliances. 2
Or
(d) Write about any three characteristics of the
combination of resistors in parallel. 3
(e) What are conductors? Name two conductors. 1+½+½=2

X/20/S & T (O)/62 [ Contd.

( 5 )

SECTION—B

( CHEMISTRY )
( Marks : 26 )

Choose and write the correct answers from the following : 1×3=3

14. The reaction H2 + Br2  2HBr is
(A) a reduction reaction
(B) an oxidation reaction
(C) a displacement reaction
(D) a combination reaction 1

15. The organic compounds containing —COOH are called
(A) esters
(B) carboxylic acids
(C) alcohols
(D) aldehydes 1

16. The impurities associated with ore used in metallurgy
are called
(A) flux
(B) slag
(C) gangue
(D) None of these 1

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( 6 )

Answer the following questions in one word or one sentence
each : 1×2=2

17. What is the condition necessary for rusting? 1

18. Name two weak acids. ½+½=1

Answer the following short-answer type questions in 30–40
words each : 2×2=4

19. What is combination reaction? Give one example with
the chemical equation. 1+½+½=2

20. Either
(a) Give two uses of methane. 1+1=2
Or
(b) What would be the anode, cathode and electrolyte
in the electro-refining of copper? Name the impurity
formed at the bottom of the container. 1½+½=2

Answer the following short-answer type questions in 50–60
words each : 3×4=12

21. (a) What is an acid salt? Give two examples. 1+½+½=2
(b) What is monobasic acid? 1

22. (a) What do you mean by period and group in the
periodic table? ½+½=1
(b) How does the valency of an element change on
(i) moving down a group and (ii) moving from left to
right in a period? 1+1=2

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( 7 )

23. (a) Define the term ‘ore’. 1
(b) What is meant by concentration of an ore? Name
two methods used for the concentration of ores.
1+½+½=2

24. Either
(a) What is pyrolysis? 1

(b) Write any two uses of sodium hydrogen carbonate. 2

Or

(c) State any two uses of ethanoic acid. 2

(d) Write the structural formula of butane. 1

Answer the following long-answer type questions in 70–80
words each : 5

25. Either
(a) Name any four methods which are commonly used
for refining of impure metals. ½+½+½+½=2

(b) Describe the process of froth floatation. 3

Or

(c) Define the term ‘pH’. Mention one application of pH
in our daily life. 1+1=2

(d) What is neutralisation? Give two applications of
neutralisation. 1+2=3

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( 8 )

SECTION—C

( BIOLOGY )
( Marks : 28 )

Choose and write the correct answers from the following : 1×3=3

26. During photosynthesis, oxygen comes from
(A) water
(B) light energy
(C) carbon dioxide
(D) both carbon dioxide and water 1

27. Exchange of gases between alveolar sac and alveolar
capillaries occurs by
(A) osmosis
(B) diffusion
(C) active transport
(D) endocytosis 1

28. Junction of two neurons is called
(A) joint
(B) synapsis
(C) synaptic buttons
(D) synapse 1

X/20/S & T (O)/62 [ Contd.

( 9 )

Answer the following questions in one word or one sentence
each : 1×3=3

29. What is holozoic nutrition? 1

30. Name the functional units of lungs and nervous system. 1

31. Name the receiving and pumping chambers of the heart. 1

Answer the following short-answer type questions in 20–30
words each : 2×4=8

32. Define photosynthesis. Write the overall reaction of
photosynthesis. 1+1=2

33. Give any two differences between breathing and
respiration. 2

34. Either
(a) What is geotropism? Name the two types of
geotropism. 1+1=2
Or
(b) Name the organs that help in excretion in
tapeworm, cockroach, earthworm and humans. ½×4=2

35. Mention any two advantages of vegetative reproduction. 2

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( 10 )

Answer the following short-answer type questions in 50–60
words each : 3×3=9

36. (a) What is cross-pollination? 1
(b) Give two advantages of cross-pollination. 2

37. Either
(a) Mention any three modes of transmission of HIV. 3
Or
(b) What is variation? 1
(c) Define the following : 1+1=2
(i) Dominant gene
(ii) Recessive gene

38. (a) Name the two steps of breathing mechanism in
humans. ½+½=1
(b) Name four types of respiratory organs found in
animals. ½+½+½+½=2

Answer the following long-answer type questions in 70–80
words : 5

39. Either
(a) Describe the main functions of plant hormones. 1×5=5
Or
(b) Write and explain functions of lymph. 5

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( 11 )

[ For Candidates without Practical Marks ]
( Marks : 20 )

40. I. Answer any three of the following questions : 2×3=6

(a) What is a spectrum? 2

(b) Distinguish between regular and irregular
reflection of light. 2

(c) What is meant by scattering of light? 2

(d) What is an electric fuse? 2

(e) What is solenoid? 2

II. Answer any three of the following questions : 2×3=6

(a) What is an exothermic and an endothermic
reaction? 2

(b) What is rusting? Name two ways of prevention
of rusting. 1+½+½=2

(c) What are alkalis? Name two alkalis. 1+½+½=2

(d) Which process is used for the enrichment of
(i) sulphide ores and (ii) oxide ores? 1+1=2

(e) Give an example of a metal which
(i) is the best conductor of heat
(ii) can be easily cut with a knife 1+1=2

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III. Answer any four of the following questions : 2×4=8

(a) What are omnivorous animals? Give two
examples. 1+½+½=2

(b) Differentiate between stock and scion. 1+1=2

(c) (i) Why is urine yellow in colour? 1
(ii) Define dialysis. 1

(d) How does secretion of the endocrine gland
reach the target organs? 2

(e) What is binary fission? Give the names of two
organisms which undergo binary fission.
1+½+½=2

(f) What are homologous organs? Give two
examples. 1+1=2

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X/20/S & T (O)/62 20K