SEE 2081(2025) | Compulsory Science Question Paper Solution | Koshi Province

see 2081-2025 compulsory science question paper solution koshi province
DR Gurung
SEE-2081-2025-Compulsory-Science-Question-Paper-Solution-Koshi-Province
To All SEE Class 10 Students of Koshi Province, here we provide you the SEE 2081-2025 Compulsory Science Question Paper Solution Koshi Province, subject code RE-1041'KoP'. Grade 10, Secondary Education Examination (SEE) was started from the date Chaitra 07, 2081 (March 20, 2025) and ended on Chaitra 19, 2081 (April 01, 2025). The solution of SEE 2081-2025 Compulsory Science question paper for Koshi Province is designed to help all kinds of people - whether you’re a student who wants to check your answers after practicing, a teacher looking for useful materials to use in class, or a parent trying to support your child as they prepare for SEE Exam. We’ve put a lot of care into making this resource clear and accurate, so it can be a real help to everyone who uses it.

The SEE 2081 Science (Bigyan) Koshi Province solution is a vital tool for Class 10 students in Nepal to confirm their answers and boost their confidence. For those gearing up for SEE 2082, it’s a motivating resource to fuel your preparation and achieve academic success. Harness this guide, trust in your potential, and let your determination light the way to a brilliant future!

We hope this article provides a detailed overview of the Compulsory Science question paper with solution from Koshi Province to help student analyze the exam pattern and prepare effectively for the future exams. Good Luck Lads!

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SEE 2081 (2025) | Compulsory Science Question Paper | Koshi Province | PDF Download.

SEE 2081 (2025) Compulsory Science Question Paper Solution Koshi Province.

SECONDARY EDUCATION EXAMINATION [SEE]
Compulsory Science (Koshi Province)
Grade 10 (Solution)
SEE – 2081 (2025)
RE-1041'KoP'
Full Marks – 75
Time - 3 hrs

Candidates are required to answer the questions in their own words as far as practicable. Figures in the margin indicate the full marks.

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Attempt ALL The Questions.

Section "A"

Multiple Choice Questions

Choose the best alternative to the following questions and write in the answer sheet.

1.(a) Which of the following unit is used for measuring the capacity of computer memory?

(i) Hz
(ii) KHz
(iii) MHz
(iv) GB
Answer: (iv) GB

b. Which of the following is the phenotypic ratio of monohybrid cross in F2 generation on the basis of recessive and dominant character?
(i) 1:3
(ii) 3:1
(iii) 1:2:1
(iv) 1:1:2
Answer: (i) 1:3

c. Which of the following organ produces male gamete in fern?
(i) Antheridium
(ii) Archegonium
(iii) Sorus
(iv) Gemma cup
Answer: (i) Antheridium

d. Which of the following plant is used for curing stomach and skin diseases?
(i) Aloe-vera
(ii) Yarsagumba
(iii) Bojo
(iv) Tulasi
Answer: (i) Aloe-vera

e. If the weight of a person on the surface of the Earth is 294 N, what might be the weight of the person on the moon?
(i) 6N
(ii) 9.8 N
(iii) 49 N
(iv) 60 N
Answer: (iii) 49 N

f. When a ship enters a river from a sea, it is found to sink more than before. What is the reason for this?
(i) Due to the temperature of the sea water being more than that of river
(ii) Due to the density of sea water is more than that of river water
(iii) Due to the temperature of sea water being less than that of river water
(iv) Due to the density of sea water being less than that of river water
Answer: (ii) Due to the density of sea water is more than that of river water

g. Figure shows refraction of ray of light. Which of the following statements is correct for this situation?
(i) Medium 1 is denser and medium 2 rarer
(ii) Medium 1 is rarer and medium 2 denser
(iii) Speed of light is same in both media
(iv) Speed of light in medium 1 is greater than medium 2
Answer: (i) Medium 1 is denser and medium 2 rarer

h. What is the value of H in Hubble's law, v = Hd?
(i) 65 km/s/Mpc
(ii) 68 km/s/Mpc
(iii) 70 km/s/Mpc
(iv) 73 km/s/Mpc
Answer: (iii) 70 km/s/Mpc

i. What is the valency of 'Y' in the following chemical equation? 2Y + 6HCl → 2YCl₃ + 3H₂
(i) 1
(ii) 2
(iii) 3
(iv) 4
Answer: (iii) 3

j. Why is detergent considered better than soap for washing clothes?
(i) Detergents work well in both hard and soft water, whereas soap is less effective in hard water
(ii) Detergents are biodegradable, whereas soap is not
(iii) Detergents are cheaper and easier to manufacture than soaps
(iv) Detergents produce less pollution than soaps

Answer: (i) Detergents work well in both hard and soft water, whereas soap is less effective in hard water

Section "B"

Very Short Answers:

2. (a) Which is the dependent variable in the experiment where solubility of salt is measured at different temperatures?
Answer: Solubility of salt is the dependent variable.

(b) Write the relation between up-thrust and density of liquid.
Answer: Up-thrust is directly proportional to the density of the liquid.

(c) Write an application of total internal reflection of light in daily life.
Answer: Total internal reflection is used in optical fibers for communication.

(d) Write any one way for the correction of defect of vision without using spectacles.
Answer: Defect of visioin can be corrected by using lens.

(e) When an alternating current of 60 Hz frequency is connected to the primary coil of a transformer, what will be the frequency of alternating current in the secondary coil?
Answer: The frequency of alternating current in the secondary coil will be 60 Hz too.

(f) Write the definition of flat universe.
Answer: A flat universe is a type of universe where average density equals critical density, where the universe expans forever.

(g) Write the name of an ore of copper.
Answer: Chalcocite is an ore of copper.

(h) Gold is found in pure state in nature, why?
Answer: Gold is found in a pure state in nature because it is chemically unreactive and does not easily form compounds with other elements.

(i) Write the structural formula of glycerol.
Answer: The structural formula of glycerol is CH₂OH-CHOH-CH₂OH.

Section "C"

Short Answers:

3. Check the correctness of the equation t + ½at² by using unit-wise analysis.

Answer:
Unit-wise Analysis of the Equation: t + ½at²
LHS (s):s = displacement
Unit of s = meter (m)

RHS (t + at²):t = time → Unit = second (s)
a = acceleration → Unit = meter per second squared (m/s²)
t² = time squared → Unit = second squared (s²)
½at² = ½ x (m/s²) × (s²) = meter (m)

So, RHS = t (s) + ½at² (m)

Observation:
→ RHS contains terms with different units: seconds (s) and meters (m)
→ It is not valid to add quantities with different units

Conclusion: LHS has unit of meters (m), but RHS has a mix of seconds (s) and meters (m).

Therefore, the equation s = t + ½at² is dimensionally incorrect.

4. Write the name of an animal having a two-chambered heart, write one characteristic of this animal.

Answer:
Name: Seahorse
Characteristic: It is cold blooded animal.

5. Write any two characteristics which distinguish queen bee and drone bee.

Answer: The two characteristics distinguishing queen bee and drone bee are:
i) Queen bee is fertile and lays eggs, while drone bee is male and does not lay eggs.
ii) Queen bee has a longer lifespan (up to 3-5 years), while drone bee lives for a few months.

6. Write any two differences between DNA and RNA.

Answer: The two differences between DNA and RNA are:

RNADNA
i. DNA is double-stranded and has long chain of nucleotides.i. RNA is single-stranded and has short chain of nucletotides.
ii. DNA stores genetic information for long period.RNA stores genetic information for shorter period than DNA.

7. How is sex determined in humans? Show by chart.

Answer: Sex in humans is determined by the combination of sex chromosomes (XX for female, XY for male) inherited from parents.

Chart:
ParentChromosomesOffspring
Mother (XX)XXX (Female) or XY (Male)
Father (XY)X or Y
The father’s sperm (X or Y) determines the sex of the child.
sex determined in human
sex determined in human

8. (i) Which chamber of the human heart receives pure blood?
(ii) Write the name of the main artery that takes pure blood from heart to different parts of the body.

Answer:
(i) The left atrium (upper chamber) receives pure (oxygenated) blood from the lungs.
(ii) The main artery is the aorta.

9. Write any two uses of the medicinal plant shown in the figure. 

medicinal-plant
two uses of medicinal plant

Answer:

Any two uses of medical plant shown in thee figure are:
i) It is used as remedy of jaundice.
ii) It is used to control vomiting.

10. How does this fall differ from an object falling on the moon? Write any two. 

object falling on the moon
object falling on the moon

Answer:

Assuming the figure shows an object falling on Earth:
i) On Earth, gravitational acceleration is 9.8 m/s², while on the Moon, it is 1.6 m/s², so the object falls slower on the Moon.
ii) Earth has an atmosphere causing air resistance, while the Moon has no atmosphere, so no air resistance affects the fall.

11. If a cricket ball is thrown vertically upward into the sky with a velocity of 18 m/s, calculate the maximum height attained by the ball. [Note: Neglect air resistance.]

Answer:
Using the formula v² = u² + 2as, where v = 0 (at max height), u = 18 m/s, a = -9.8 m/s²:

0 = (18)² + 2(-9.8)s
0 = 324 - 19.6s
s = 324 / 19.6 ≈ 16.53 m
The maximum height attained is approximately 16.53 meters.

12. Draw a neat diagram of the electric current production process by using a magnet and a coil.

Answer:

The diagram shows a coil with a magnet moving in and out, inducing current (electromagnetic induction).
electric current production process by using a magnet and a coil
electric current production process by using a magnet and a coil

13. Write any two differences between alternating current and direct current.

Answer:

The two differences between alternating current (AC) and direct current (DC) are -
Alternating Current (AC)Direct Current (DC)
AC changes direction periodically.DC flows in one direction only.
AC is used for long-distance power transmission.DC is used in batteries and electronic devices.

14. Identify the compound X in the given chemical equation and balance the equation: X + HCl → ZnCl₂ + H₂O

Answer:

Compound X is ZnO (zinc oxide).

Balanced equation: ZnO + 2HCl → ZnCl₂ + H₂O

15. Write the general molecular formula of the compound H-C≡C-H given. Also write the IUPAC name of the compound.

Answer:
General molecular formula of the compound H-C≡C-H: CnH₂n-₂
IUPAC name: Ethyne

16. Which food preservative is better between natural food preservatives and chemical food preservatives? Why?

Answer:

Natural food preservatives (e.g., salt, vinegar) are generally better than chemical preservatives because:

i) They are safer and have fewer health risks compared to synthetic chemicals.
ii) They are biodegradable and environmentally friendly.

Section "D"

Write long answers to the following questions:

17. (i) Identify the transmission channel communication shown in the given figure.

transmission channel communication
transmission channel communication
(ii) Write any two characteristics of the transmission channel shown in figure.
(iii) Give one example of the use of this transmission channel.

Answer:


(i) The shown figure is of baseband transmission.

(ii) Two characteristics of a baseband transmission are:
- It transmits signals through the channel without converting them into analog
- It is used for short distance.

(iii) Example: sending data from one computer to another by connecting a cable

18. Write two advantages and two disadvantages of cross-breeding between local buffaloes with high-quality he-buffalo (ranga).

Answer:

Advantages:
1. Improved milk production: Cross-breeding can result in offspring with higher milk yield due to the superior genetics of the he-buffalo.
2. Enhanced disease resistance: The hybrid offspring may inherit better immunity from the high-quality he-buffalo, reducing susceptibility to local diseases.

Disadvantages:

1. Loss of local adaptability: The offspring may not adapt as well to local environmental conditions compared to pure local buffaloes.
2. High cost: Maintaining high-quality he-buffaloes and performing cross-breeding can be expensive and resource-intensive.

19. Write any two causes and two preventive measures of heart attack.

Answer:

Causes:
1. Blockage of coronary arteries: Accumulation of cholesterol and plaque narrows the arteries, reducing blood flow to the heart.
2. High blood pressure: Chronic hypertension strains the heart, increasing the risk of a heart attack.

Preventive Measures:
1. Healthy diet: Consuming a balanced diet low in saturated fats and high in fruits and vegetables reduces cholesterol levels.
2. Regular exercise: Physical activity strengthens the heart and improves circulation, lowering the risk of heart disease.

20. (i) Due to which property of water is the organism living in the condition given in the figure?

property-of-water
property of water
(ii) Why is the water at 0°C floating at the top?
(iii) Write the biological significance of this characteristic of water.
(iv) Mention one problem caused by this property of water in daily life.

Answer:

(i) The organism survives due to the anomalous expansion of water

(ii) Water at 0°C floats because it becomes less dense as it freezes. At 4°C, water reaches its maximum density; below this, it expands and forms ice, which is lighter and floats.

(iii) Biological significance: This property ensures that bodies of water freeze from the top down, allowing fish and other organisms to survive in liquid water beneath the ice during winter.

(iv) Problem in daily life: The expansion of water upon freezing can cause pipes to burst in cold weather, leading to plumbing issues.

21. (i) Write any two differences between convex and concave lenses.
(ii) The power of the lens used in the spectacles worn by a student is 4 D. Calculate the focal length of the lens. Also mention the type of the lens.

Answer:

(i) Two differences between convex and concave lenses:
- Convex lenses converge light rays to a focal point, while concave lenses diverge light rays.
- Convex lenses are thicker at the center and thinner at the edges, while concave lenses are thinner at the center and thicker at the edges.

(ii) Given: Power (P) = 4 D
Formula: P = 1/f (where f is focal length in meters)
4 = 1/f
f = 1/4 = 0.25 m = 25 cm
Focal length: 25 cm
Type of lens: Since the power is positive, it is a convex lens, used to correct farsightedness (hyperopia).

22. Study the given table and answer the following questions.

ElementElectronic Configuration
P1s² 2s² 2p⁵
Q1s² 2s² 2p⁶ 3s²
R1s² 2s² 2p⁶ 3s² 3p⁵
(i) Write the valency of element Q.
(ii) Between P and R, which one is more reactive? Why?
(iii) Write the balanced chemical equation of the chemical reaction between elements Q and R.

Answer:

(i) Element Q: 1s² 2s² 2p⁶ 3s² (Magnesium, Mg)
Valency = 2 (it loses 2 electrons from the 3s orbital to achieve a stable configuration).

(ii) Element P: 1s² 2s² 2p⁵ (Fluorine, F); Element R: 1s² 2s² 2p⁶ 3s² 3p⁵ (Chlorine, Cl)

P (Fluorine) is more reactive than R (Chlorine) because fluorine is higher in the halogen group, has a smaller atomic size, and a higher electronegativity, making it more eager to gain an electron.

(iii) Reaction between Q (Mg) and R (Cl):
Mg + Cl₂ → MgCl₂
Balanced equation: Mg + Cl₂ → MgCl₂

23. (i) Write the balanced chemical equation involved in the process shown in the vessel of the given diagram.

balanced-chemical-equation
balanced chemical equation
(ii) Can dilute sulphuric acid be used instead of dilute hydrochloric acid? Why?
(iii) What is the reason for collecting this gas in an erect gas jar?

Answer:

(i) Assuming the diagram shows the preparation of CO₂ using CaCO₃:
Balanced equation: CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂

(ii) No, dilute sulphuric acid (H₂SO₄) can not be used instead of dilute hydrochloric acid (HCl). The reaction would be:
CaCO₃ + H₂SO₄ → CaSO₄ + H₂O + CO₂

Reason: While dilute sulfuric acid (H₂SO₄) can react with calcium carbonate (CaCO₃) to produce carbon dioxide (CO₂), it's not typically used in the laboratory preparation of CO₂ because the calcium sulfate (CaSO₄) formed is insoluble and coats the marble chips, inhibiting the reaction.

(iii) CO₂ is collected in an erect gas jar because it is heavier than air (density 1.5 times that of air). It sinks and displaces air upward, allowing efficient collection by downward displacement.

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