MBOSE Class 10 Question Paper 2019 for Science and Technology Old Course

Total No. of Printed Pages—12
X/19/S & T (O)

2019

SCIENCE AND TECHNOLOGY

( Old Course )

( COMPARTMENTAL/IMPROVEMENTAL CANDIDATES WITH
PRACTICAL/INTERNAL ASSESSMENT )

Full Marks : 80
Pass Marks : 24

( NON-REGULAR, PRIVATE AND COMPARTMENTAL WITHOUT
PRACTICAL/INTERNAL ASSESSMENT )

Full Marks : 100
Pass Marks : 30

Time : 3 hours

The figures in the margin indicate full marks for the questions

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 Compartmental/
Improvemental Candidates with Internal marks.

(iv) Question Nos. 1 to 40 are to be answered by Compartmental
Candidates without Internal marks/Non-regular/Private
Candidates.

/9 [ P.T.O.

( 2 )

SECTION—A
( PHYSICS )
( Marks : 26 )

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

1. Refraction of light takes place due to the change in its

(a) speed

(b) wavelength

(c) nature

(d) None of the above 1

2. A fuse is always connected with the electrical circuit

(a) in parallel

(b) in series

(c) Both in series and parallel

(d) None of the above 1

3. The core of an electromagnet is

(a) steel

(b) magnesium

(c) soft iron

(d) copper 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 in air? 1

5. Which will offer more resistance—a short wire or a long wire? 1

6. What is a magnetic field? 1

Answer the following short-answer type questions in 30–40 words
each : 2×3=6

7. Either

(a) State the laws of reflection of light. 2
Or

(b) What are the two possible causes of myopia? 1+1=2

8. Write any two advantages of alternating current over direct
current. 1+1=2

9. Why are two magnetic lines of force never found to intersect
each other? 2

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

10. (a) What is the formula for a lens connecting image distance v,
object distance u and focal length f ? 1

(b) Define one dioptre. Name the instrument used for
measuring the power of a lens. 1+1=2

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( 4 )

11. (a) Define electric current. 1

(b) 30 coulombs of charge flows through any cross-section of
a conductor in 20 seconds. What is the current flowing
through the conductor? 2

12. Either

(a) Distinguish between real image and virtual image. 3
Or

(b) Derive the relationship between SI unit of electrical energy
and commercial unit of electrical energy. 3

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

13. Either

(a) State Ohm’s law. 2

(b) State the mathematical expression to verify the law. 1

(c) An electric heater draws a current of 11 A, when
connected to 220 V main supply. Calculate the resistance
of the filament of the heater. 2
Or

(d) Define power of accommodation. 1

(e) Mention any two uses of concave mirror. 2

(f) What is the nature of the lens, if the power of the lens is
(i) positive and (ii) negative? 2

X/19/S & T (O)/9 [ Contd.

( 5 )

SECTION—B
( CHEMISTRY )
( Marks : 26 )

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

14. The metal which can be cut with a knife is 1

(a) sodium

(b) iron

(c) lithium

(d) caesium

15. Which of the following is a strong acid? 1

(a) CH 3COOH

(b) H 3PO4

(c) H2CO 3

(d) HCl

16. The number of periods in the periodic table is 1

(a) 6

(b) 7

(c) 10

(d) 8

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( 6 )

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

17. Define an acid according to Brönsted-Lowry concept. 1

18. What is metallurgy? 1

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

19. Define corrosion. Name two methods used for the prevention
of corrosion. 1+½+½=2

20. Either

(a) What are normal salts? Give two examples. 1+½+½=2
Or

(b) How is bleaching powder prepared? Give the chemical
equation. 1+1=2

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

21. (a) What do you mean by combination reaction? Give an
example. 1+1=2

(b) Why do gold and silver not corrode in moist air? 1

22. (a) What happens when iron reacts with steam? Give the
equation. 1+1=2

(b) State modern periodic law. 1

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23. Differentiate between the roasting and calcination processes
used in metallurgy. Give one example of each. 2+½+½=3

24. Either

(a) What is a functional group in an organic compound? 1

(b) What are carboxylic acids? What happens when ethanoic
acid reacts with ethyl alcohol? 1+1=2
Or

(c) Name two crystalline allotropes of carbon. ½+½=1

(d) What are isomers? 1

(e) Write the IUPAC name of the following compound : 1
H H H O
H—C—C—C—C—OH
H H H

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

25. Either

(a) What is flux? What chemical process is used for obtaining
a metal from its oxide? 1+1=2

(b) Describe the process of froth flotation. 3
Or

(c) What are soaps? 1

(d) Name the raw materials used for making soap. 2

(e) How is transparent soap prepared from soft soap? 2

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SECTION—C
( BIOLOGY )
( Marks : 28 )

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

26. The mode of nutrition in fungi (mushroom) is called

(a) autotrophic

(b) holozoic

(c) heterotrophic

(d) saprophytic 1

27. The lungs are covered by a membrane called

(a) pericardium

(b) pleura

(c) myelin sheath

(d) periosteum 1

28. Which of the following is not a plant hormone?

(a) Gibberellin

(b) Oxytocin

(c) Ethylene

(d) Cytokinin 1

X/19/S & T (O)/9 [ Contd.

( 9 )

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

29. Name the enzyme present in saliva of human beings. 1

30. How do insects and fishes respire? ½+½=1

31. What is gene? 1

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

32. What are the factors that affect the rate of photosynthesis? 2

33. What is blood pressure? Name the instrument used to
measure blood pressure. 1+1=2

34. Either

(a) Name three types of blood corpuscles present in the
human blood. 1½

(b) Which fluid transports fatty acids and glycerol in the
human body? ½
Or

(c) Name any four sense organs for receptor. ½×4=2

35. Mention any two basic features of asexual reproduction. 2

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( 10 )

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

36. What are vestigial organs? Name four vestigial organs. 1+2=3

37. Either

(a) What are the four great blood vessels of the heart? 2

(b) What is the respiratory pigment present in erythrocytes? 1
Or

(c) Give any three important characteristics of hormone. 3

38. (a) What is tissue culture? 1

(b) Distinguish between binary and multiple fission. 2

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

39. Either

(a) Write any five main functions of human blood. 5
Or

(b) What are the functions of saliva? 5

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( 11 )

[ For Candidates (without Practicals) only ]

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

(a) What do you mean by magnification of spherical
mirror? 2

(b) What is dispersion of light? Which colour bends
the most? 1+1=2

(c) What are insulators? Give two examples. 1+1=2

(d) (i) What is meant by magnetic effect of current? 1
(ii) How does a conductor behave when electric
current flows through it? 1

(e) Name the instruments used to measure current and
potential difference. 1+1=2

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

(a) Define the terms (i) oxidation and (ii) reduction. 1+1=2

(b) (i) Name the simplest hydrocarbon. 1
(ii) Give the general formula of alkanes. 1

(c) (i) Name the non-metal which is good conductor
of electricity. 1
(ii) What is an alloy? 1

(d) Mention any two applications of pH. 2

(e) What are malleability and ductility? 1+1=2

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

(a) Name the four chambers of human heart. ½×4=2

(b) Name the accessory whorls and the reproductive
whorls of a flower. ½×4=2

(c) Define transpiration. Name the plant tissue
concerned with transport of water and food materials.
1+1=2

(d) (i) What is ultrafiltration? 1
(ii) Name the main excretory organs in human
beings. 1

(e) Name the different parts of central nervous system
of the human body. 2

(f) How does vegetative reproduction occur in colocacia,
chrysanthemum, onion and strawberry? ½×4=2

HHH

X/19/S & T (O)/9 K9—19660