Goa Board Class 10 Question Paper 2025 Science

2025 III 15 0930 Seat No.

Time : 3 Hours SCIENCE (E)
Subject Code

S 1 0 3 1

Total No. of Questions : 67 (Printed Pages : 15) Maximum Marks : 70

INSTRUCTIONS : Read the following instructions carefully and strictly follow
them :

(i) There are 67 questions in the question paper. All
questions are compulsory.

(ii) Question Nos. 1 to 14 are multiple choice questions
carrying one mark each.

(iii) Question Nos. 15 to 18 are very short answer type
questions, carrying 1 mark each.

(iv) Question Nos. 19 to 46 are short answer type I questions
carrying 2 marks each.

(v) Question Nos. 47 to 58 are short answer type II questions,
carrying 3 marks each.

(vi) Question Nos. 59 to 67 are long answer type questions,
carrying 4 marks each.

(vii) There is no overall choice in the question paper.
However, an internal choice has been provided for
three questions of 2 marks, two questions of 3 marks
and one question of 4 marks. Only one of the choices
in such questions has to be attempted.

(viii) In addition to this, separate instructions are given for
each question wherever necessary.

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Select the correct alternative given below each statement and

complete the statement :

1. Radiation that is highly damaging to organisms and it is known to cause

skin cancer in human beings in .................... . 1

• Infra-red radiations

• Visible radiations

• Ultraviolet radiations

• Microwaves

2. The decomposition of vegetable matter into compost is an example

of .................... . 1

• Endothermic reaction

• Reduction reaction

• Exothermic reaction

• Displacement reaction

3. Salivation and vomiting is controlled by .................... . 1

• Spinal cord

• Hind brain

• Fore brain

• Mid brain

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4. The first member of alkyne homologous series is .................... . 1

• Ethane

• Ethyne

• Methene

• Methane

5. Gustatory receptors detect .................... . 1

• Taste

• Smell

• Touch

• Sound

6. The opening and closing of the stomatal pore depends upon .................... .
1

• Oxygen

• Temperature

• Water in guard cells

• Concentration of carbon dioxide in stomata

7. The growth of tendril in pea plants is due to .................... . 1

• Effect of gravity

• Effect of light

• Rapid cell divisions in tendrillar cells in contact with support.

• Rapid cell divisions in tendrillar cells that are away from the support.

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8. The apparent flattening of the sun’s disc at sunrise and sunset is due
to .................... . 1

• Scattering of light

• Dispersion of light

• Reflection of light

• Atmospheric refraction

9. Metals like .................... are obtained by electrolysis of the molten
chloride. 1

• Zinc, iron and lead

• Gold, silver and copper

• Aluminium, zinc and iron

• Sodium, magnesium and calcium

10. Enzyme that converts starch into sugar is .................... . 1

• Pepsin

• Trypsin

• Lipase

• Amylase

11. Neutralization reaction among the following is .................... . 1

• 2NaOH + Zn Na 2 ZnO2 + H2

• NaOH + HCl NaCl + H 2O

• Na 2 O + CO2 Na 2CO3

• 4Na + O2 2Na 2O

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12. Multi-cellular organisms like ....................... can be cut into any number of

pieces and each piece grows into a complete organism. 1

• Amoeba and hydra

• Paramecium and planaria

• Hydra and planaria

• Plasmodium and amoeba

13. The refractive index of glass is 1.5, velocity of light in glass is .......................

1

• 2 × 108 m/s

• 3 × 108 m/s

• 4.5 × 108 m/s

• 6 × 108 m/s

14. When an iron nail is immersed in the copper sulphate solution, the iron

nail becomes brownish and copper sulphate solution fades in colour

and forms a pale green solution. The pale green solution left in the test tube

is ...................... . 1

• Copper sulphate

• Copper chloride

• Iron sulphate

• Iron chloride

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Name the following/Give a term :

15. The accumulation of non-biodegradable pesticides in the food chain in

increasing amount at each trophic level. 1

16. The process of changing magnetic field in a conductor results in current in

another conductor. 1

Observe the correlation in the first pair and complete the second

pair :

17. 1 Dioptre : focal length 1 metre :: – 2 Dioptre : ..................... 1

Q W
18. : Current I :: : ........................ 1
t Q

What happens when : 2

19. Gypsum is heated at 373 K.

20. When electricity is passed through an aqueous solution of sodium chloride ?

Elements react with each other to attain a completely filled valence

shell. Given below is the formation of a compound : 2

21. Write the molecular formula of the above compound and name the type of

compound formed.

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22. This type of compounds do not conduct electricity in solid state but conduct

electricity in molten state. Give reason :

Attempt the following : 2

23. Balance the following chemical reaction :

Al + HCl AlCl3 + H2

24. In a chemical reaction, the total mass of the elements present in the products

has to be equal to the total mass of the elements present in the reactants.

why ?

Plants and animals require a specific pH range for their healthy

growth : 2

25. Milk of magnesia when taken orally reduces pain and irritation in our

stomach. Give reason.

+
26. What effect does the concentration of H (aq) ions have on the nature of

saliva in our mouth ?

The functional groups present in the carbon compounds dictate

the property of that compound : 2

27. Identify and name the functional group present in ethanone and butanoic

acid.

28. Draw the structure of cyclohexane (complete molecule).

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Answer the following : 2

29. List any two types of contraceptive methods for men.

30. State two functions performed by a special tissue called placenta.

Carbon and energy requirements of the autotrophic organisms are

fulfilled by photosynthesis : 2

31. State the form in which the following is stored :

(a) Unused carbohydrates in plants

(b) The energy that derived from food in humans.

32. List the events that occur during the process of photosynthesis.

Answer the following : 2

33. Bleaching powder is extensively used in cotton and line industries, state any

other two uses of it.

34. Hydrogen gas is not evolved when metal reacts with HNO3. Give reason.

Gregor Mendel was growing pea plants in two fields ‘A’ and ‘B’.

While the plants in field ‘A’ produced white coloured flowers,

plants in Field ‘B’ produced yellow coloured flowers.

It was observed that in field ‘A’, all the plants showed white

coloured flowers for consecutive generations, whereas in field ‘B’,

majority of the plants showed variations in colours. 2

35. What are the probable reasons for these ?

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36. ‘‘It is possible that a trait is inherited but may not be expressed in the next

generation’’. Give reason to justify this statement.

Attempt the following : 2

37. Suggest one word for the statement/definition :

‘‘Each step or level of food chain where transfer of energy takes place.’’

38. The existence of decomposers is essential in an ecosystem. Give reason.

Different species use different strategies to determine the sex of

new born : 2

39. How can genetic inheritance determine sex in human beings ? Explain.

40. Write two points of difference between X chromosomes and Y chromosomes.

Observe the following figure and answer the questions given

below : 2

41. Which rule can be used to explain above device, also state the principle

behind its functioning.

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42. Write a point of difference between the usage of split-ring in an electric motor
and in an electric generator.

Or

Observe the following figure and answer the questions given
below : 2

41. State the application of the above rule.

42. How can the magnitude of the magnetic field be increased at a given point

in a current carrying copper wire.

Do as directed : 2

43. An electric heater rated 400 W operates 6 hours per day. Find the cost of
energy to operate it for 30 days at three rupees per unit.

44. Though the same current flows through the electric line wires and bulb
filament, yet only the filament glows, why ?

Or

Do as directed : 2

43. An electric bulb of resistance 200 ohms draws current of 1 Ampere. Calculate
the power of the bulb and the potential difference at its end.

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44. State three factors on which the heat produced by an electric current

depends.

‘‘Plant hormones do not always promote growth.’’ 2

45. Cite an example in support of the above statement and mention the function

of that plant hormone.

46. How do shoot and roots of a plant respond to the pulls of earth’s gravity ?

Or

A squirrel is in a scary situation. Its body has to prepare for either

fighting or running away. 2

45. State the immediate changes that take place in its body so that the squirrel

is able to run or fight ?

46. How the timing and the amount of hormone released is regulated in human

body ?

Answer the following : 3

47. State the importance of using a fuse in a house hold electrical circuit.

48. Distinguish between the magnetic field around a bar magnet and a solenoid

with respect to the strength of the magnetic field.

49. An electrician used three insulated wires of colours green, red and black in

a domestic circuit. State the function of green wire in the circuit.

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From the figure given below identify the parts and their

functions : 3

50. Which of the numbers represent the site of fertilization and the site of

implantation and name the sites.

51. How is the surgical removal of unwanted pregnancies misused ?

52. Write two major functions of placenta.

Various processes are very essential to maintain life. 3

53. Write the structural differences between the composition of artery and vein.

54. How is the amount of urine produced regulated ?

55. Where does aerobic respiration occur in a cell and name the three-carbon

molecule broken down there in the presence of oxygen ?

Or

Products of photosynthesis are moved from leaves to other parts

of the plant. 3

53. Write a point of difference between transpiration and translocation.

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54. Plants have low energy needs as compared to animals. Give reason.

55. Where are the waste products stored in plants ?

Answer the following : 3

56. Complete and write the following reaction given below :

H SO
2 4
C2H5OH + CH3COOH H2O + ____________

57. Saponification process is used to make soap. Explain the saponification

reaction.

58. What is the role of conc. H2SO4 in making ethene from ethanol ?

Or

Answer the following : 3

56. Complete and write the following reaction given below :

Alkaline KMnO4
CH3CH2OH or Acidified K 2Cr2O7

57. Soaps and detergents are made of different type of salts. State the difference

between their salts.

58. In the science lab of your school you have two bottles of carbon compounds

with the molecular formula C4H8 and C5H12 respectively. Which one of these

is most likely to show addition reaction ? Justify your answer.

Two resistors of 4 ohm are connected together in a circuit so that

the total resistance is 2 ohm. 4

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59. Draw a circuit diagram to show the above arrangement of combination of

resistors, also connect an ammeter, a switch and two cells of 1.5 each. Show

the direction of flow of current.

60. Calculate the amount of current flowing in the above circuit if the cross

section of those two resistors of 4 ohm are doubled and connected to above

circuit in the same way.

61. 100 j of heat is produced each second in a 4 ohm resistor. Find the potential

difference across the resistor.

The human eye is one of the most sensitive sense organs : 4

62. When do we consider a person to be myopic or hypermetropic ?

63. How does a bi-focal lens correct the vision of person with presbyopia ?

64. Explain with the help of a ray diagram how the defect associated with

hypermetropic eye can be corrected.

Do as directed : 4

65. A slide projector has a convex lens with a focal length of 15 cm. The slide

is placed upside down 16 cm from the lens. How far away should the screen

be placed from the slide projector lens so that the slide is in focus ?

66. A ray of light travelling in kerosene enters obliquely into water. Does the

light ray bend towards or away from the normal. Why ?

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67. Draw a ray diagram to show the formation of image of an object placed at

2F1 of a convex lens.

Or

Do as directed : 4

65. The image formed by a spherical mirror is real, inverted and is of

magnification-2. If the image is at a distance of 30 cm from the mirror, where

is the object placed.

66. Give reasons why shaving mirrors and mirror used by dentists are of the

same type.

67. Draw a ray diagram to show the formation of image of an object placed at

the centre of curvature of a concave mirror.

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