SEE 2081 Science Exam Solutions
View koshi Province Science Question with Solution (Easy and detailed understandable solution.)
Our comprehensive solutions to the SEE 2081 Koshi Province Science Exam span every part of the paper, from multiple-choice questions to in-depth, long-answer problems. Designed with simplicity and precision, these answers include step-by-step explanations to ensure concepts are fully understood.
For students preparing for SEE 2082 or those targeting better grades in supplementary exams, the 2081 Koshi Province Science solutions are an invaluable asset. They reveal recurring themes and question formats, such as practical physics applications, chemistry equations, or biology diagram-based queries, which are consistent features of the SEE Science syllabus. Combining these solutions with past papers and model questions can help you develop a strong study plan, preparing you to confidently tackle any exam challenge. At the end of this article, you’ll also have the chance to view and download handwritten solutions. Best wishes for your success!
Section A: Multiple Choice Questions
Choose the best alternative to the following questions and write in the answer sheet.
(i) Hz
(ii) KHz
(iii) MHz
(iv) GB
Answer: GB
(i) 1:3
(ii) 3:1
(iii) 1:2:1
(iv) 1:1:2
Answer: 3:1
(i) Antheridium
(ii) Archegonium
(iii) Sorus
(iv) Gemma cup
Answer: Antheridium
(i) Aloe-vera
(ii) Yarsagumba
(iii) Bojo
(iv) Tulasi
Answer: Aloe-vera
(i) 6N
(ii) 9.8 N
(iii) 49 N
(iv) 60 N
Answer: 49 N
(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: Due to the density of sea water is more than that of river water
(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: Medium 1 is denser and medium 2 rarer
(i) 65 km/s/Mpc
(ii) 68 km/s/Mpc
(iii) 70 km/s/Mpc
(iv) 73 km/s/Mpc
Answer: 73 km/s/Mpc
(i) 1
(ii) 2
(iii) 3
(iv) 4
Answer: 3
(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: Detergents work well in both hard and soft water, whereas soap is less effective in hard water
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Section B: Very Short Answers
Answer: Solubility of salt is the dependent variable.
Answer: Up-thrust is directly proportional to the density of the liquid.
Answer: Total internal reflection is used in optical fibers for communication.
Answer: Defect of visioin can be corrected by using lens.
Answer: The frequency of alternating current in the secondary coil will be 60 Hz too.
Answer: A flat universe is a type of universe where average density equals critical density, where the universe expans forever.
Answer: Chalcocite is an ore of copper.
Answer: Gold is found in a pure state in nature because it is chemically unreactive and does not easily form compounds with other elements.
Answer: The structural formula of glycerol is CH₂OH-CHOH-CH₂OH.
Section C: Short Answers
Answer:
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.
Answer:
Name: Seahorse
Characteristic: It is cold blooded animal.
Answer: 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.
Answer: Two differences between DNA and RNA are:
| DNA | RNA |
|---|---|
| DNA is double-stranded and has long chain of nucleotides | RNA is single-stranded and has short chain of nucletotides |
| DNA stores genetic information for long period | RNA's major function is to form protein synthesis. |
Answer: Sex in humans is determined by the combination of sex chromosomes (XX for female, XY for male) inherited from parents.
Chart:
| Parent | Chromosomes | Offspring |
|---|---|---|
| Mother (XX) | X | XX (Female) or XY (Male) |
| Father (XY) | X or Y |
(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.
Answer: Any two uses of medical plant shown in thee figure are:
i) It is used as remedy of jundice
ii) It is used to control vomitting
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.
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.
Answer: The diagram shows a coil with a magnet moving in and out, inducing current (electromagnetic induction).
Answer:
| 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. |
Answer: Compound X is ZnO (zinc oxide).
Balanced equation: ZnO + 2HCl → ZnCl₂ + H₂O
Answer:
General molecular formula: C₂H₂ (alkyne series: CₙH₂ₙ₋₂)
IUPAC name: Ethyne
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.
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Section D: Write long answers to the following questions:
(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 withoug converting them into analog
- It is used for short distance.
(iii) Example: sending data from one computer to another by connecting a cable
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.
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.
(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.
(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).
| Element | Electronic Configuration |
|---|---|
| P | 1s² 2s² 2p⁵ |
| Q | 1s² 2s² 2p⁶ 3s² |
| R | 1s² 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
(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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