SEE 2081 (2025) Science Exam Solutions
Explore Bagmati Province Science Question with Clear and Insightful Answers
For students preparing for SEE 2082 or those aiming to improve their grades through supplementary exams, the 2081 Bagmati Province Science solutions are a treasure trove. They highlight recurring themes and question types, such as practical applications in physics or diagram-based questions in biology, which are staples of the SEE Science syllabus. Pairing these solutions with past papers and model questions can create a robust study plan, ensuring you’re ready to tackle any challenge the exam throws your way. At the end of this article, you can view and download handwritten solution too. So good luck.
Section A: Multiple Choice Questions
(i) 40
(ii) 42
(iii) 44
(iv) 46
Answer: 46
(i) P = 1/f
(ii) M = 1/f
(iii) P = f
(iv) f = u
Answer: P = 1/f
(i) Aortic valve
(ii) Bicuspid valve
(iii) Pulmonic valve
(iv) Tricuspid valve
Answer:Tricuspid valve
(i) Neem
(ii) Heart-leaved moonseed
(iii) Asiatic pennywort
(iv) Holy basil
Answer: Holy basil
(i) Ethanol
(ii) Ethylene glycol
(iii) Methanol
(iv) Glycerol
Answer: Ethylene glycol
(i) It increases
(ii) It decreases
(iii) It becomes zero
(iv) It remains the same
Answer: It increases
(i) Electric motor changes electrical energy into kinetic energy
(ii) Electric generator changes electrical energy into kinetic energy
(iii) Both electric motor and generator change electrical energy into mechanical energy
(iv) Both electric motor and generator work on the same principle
Answer: Electric motor changes electrical energy into kinetic energy
(i) Mass of matter
(ii) Volume of matter
(iii) Temperature of matter
(iv) Nature of matter
Answer: Nature of matter
(i) kg ms⁻²
(ii) kg ms⁻¹
(iii) kg m²s⁻²
(iv) kg ms⁻³
Answer: kg m²s⁻²
(i) 875 N
(ii) 975 N
(iii) 1075 N
(iv) 1175 N
Answer: 875 N.
Using Pascal’s principle, pressure is constant across the fluid, so the force on piston B is (500 × 350) / 2000 = 875 N.
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Section B: Very Short Answers
Answer: Arteries are the blood vessel that carry blood from heart to different parts of body
Answer: Ammonium Hydroxide (NH4OH) is formed when ammonia dissolves in water
Answer:Carbon Dioxide is collected in erected dry gas jar because it is 1.5 times heavier than air.
Answer:A good neitizen should always avoid sharing fake news.
Answer: Negative catalyst decreases the rate of chemical reaction.
Answer: Detergents are considered less eco friendly as compared to soap because due to different chemical composition detergents have high probability to pollute water.
Answer: When black(BB) and vrown (bb) are crossed the genotypic ratio in second filial generation will be 1:2:1
Answer:
Answer: The refractive index of water (n) is calculated using the formula:
n = cair ∕ cwater
Where:
- cair = 3 × 108 m/s (speed of light in air)
- cwater = 2.25 × 105 m/s (speed of light in water)
Substituting the values:
n = 3 × 108 ∕ 2.25 × 105 = 1.33
The refractive index of water is 1.33.
Section C: Short Answers
Answer: Any two characteristics of worker bee are:
i) They are diploid having 32 chromosome.
ii)They are formed from fertilized eggs
Answer: Any two effects of climate change are:
i)Increase in sea level
ii)Extiaction of various plants and animals.
Answer:Any two differences between independent and dependent variables are:
| Independent Variable | Dependent Variable |
|---|---|
| The independent variable is changed or controlled in an experiment. | The dependent variable is affected by the change in the independent variable. |
| It is also called manipulating variable | It is also called responding variable |
Answer:
Sparrow
Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Classes: Aves
Fern
Kindgom: Plantae
Division: Tracheophyta
Subdivision: Pteridophyta
Answer: Mandel would have faced following problems if he had used Apple instead of pea plant:
i)Apple has longer life span so , it would take more time to conclude the experiment
ii)Apple has complex cross-pollination as compared to pea plant.
Answer:In the above figure 16N represents weight of displaced liquid.
The weight of object must be equal to weight of displaced liquid for the object to fload on water i.e 16N
Answer:
| Flat Universe | Closed Universe |
|---|---|
| In a flat universe, the geometry of space is flat, meaning it follows Euclidean geometry, and parallel lines never meet. | In a closed universe, the geometry of space is curved, and it is finite, meaning parallel lines eventually meet. |
| A flat universe will continue to expand forever at a slowing rate. | A closed universe will eventually stop expanding and then begin contracting, leading to a "big crunch." |
Reaction (A): MgO + H₂O → Mg(OH)₂
Reaction (B): Zn + dil H₂SO₄ → ZnSO₄ + H₂
(i) Out of these two chemical equations, which one is the combination reaction?
Answer: Anong the given two reactions, the reaction 'A' is combination reaction
(ii) What happens when concentrated H₂SO₄ is used instead of dilute H₂SO₄ in chemical reaction B?
Answer: When concentrated H₂SO₄ is used, zinc reacts differently to produce SO₂ and water. The reaction is as follows:
Zn + 2H₂SO₄ (conc.) → ZnSO₄ + SO₂ + 2H₂O
Answer: The salt used in the laboratory preparation of CO₂ gas is calcium carbonate (CaCO₃).
Answer: Although the use of pesticides is considered a major concern for agriculture, any write two reasons why its use continues are:
i) Effective pests control: Pesticides provide quick and reliable protection against pests, insects, fungi and weeds that can destroy croops.
ii)Increased agricultural productivity : By controlling pests, pesticides help in maintaining high yields and iimproving the quality of crops.
Answer: Among the listed animals, the Whale is the only mammal.
Mammals are characterized by features such as giving birth to live young (with a few exceptions like monotremes), having hair or fur, and producing milk to feed their young. The Peacock, Crocodile, Snake, and Sea-horse are not mammals.
The least developed animal in this group would be the Sea-horse. While all these animals have evolved to survive in their environments, the Sea-horse is often considered one of the most primitive in terms of its body structure and behaviors compared to the others.
Answer: To calculate the heat energy required to raise the temperature of water, we can use the formula:
Q = mcΔT
Where:
- Q is the heat energy (in joules),
- m is the mass of water (in grams),
- c is the specific heat capacity of water (4.18 J/g°C),
- ΔT is the change in temperature (in °C).
Given:
- m = 700 g,
- c = 4.18 J/g°C,
- ΔT = 40°C - 5°C = 35°C.
Now, we can plug the values into the formula:
Q = 700 g × 4.18 J/g°C × 35°C
Q = 102,130 J
Therefore, the heat energy required to raise the temperature of 700 g of water from 5°C to 40°C is 102,130 joules.
Here is a simple diagram to illustrate the heat energy process:
(i) Between A and B, in which part will you put impure silver?
Answer: I will put impure silver in the positive terminal, i.e., 'A'.
(ii) What is the role of 'C' in obtaining pure silver?
Answer: The role of 'C' is to act as the electrolyte, which contains a solution of a salt of silver (such as silver nitrate). During electrolysis, silver ions from the solution get deposited on the negative terminal (cathode, 'B'), which is made of pure silver, while impure silver from the anode ('A') dissolves into the solution. This helps in the purification of silver.
Answer:
The molecular mass of 44 amu corresponds to the saturated hydrocarbon propane (C₃H₈).
Structural formula of propane:
CH₃–CH₂–CH₃
IUPAC name of the saturated hydrocarbon with molecular mass 44 amu: Propane
If two hydrogen atoms are removed from adjacent carbon atoms of propane, the resulting compound is an alkene with a double bond between those carbons. The compound formed is propene (C₃H₆).
IUPAC name of the compound formed: Propene
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Write long answers to the following questions:
Answer:
s-block elements:
They are very reactive.
They form ionic compounds easily.
p-block elements:
They include metals, non-metals, and metalloids.
They can show different oxidation states.
Answer:
(ii) Measuring the stretch of a catapult and the distance covered by the stone thrown by it.
Answer:
Answer:
Diagram:
Causes of dispersion of light:
Different colours of light travel at different speeds in a prism.
Each colour bends (refracts) by a different amount when passing through the prism.
| Blood Cells | No. of Blood Cells |
|---|---|
| W | 30,000,000 |
| X | 3,000,000 |
| Y | 3,500,000 |
(i) Which blood cell count is within the normal range?
(ii) What issue arises from the X blood cell count?
(iii) If Y drops to 1,500,000, what problem might occur?
(iv) Name the blood cell W.
Answer: (i) Blood cell'Y' is in normal condition
(ii) A problem that arises due to the number of X blood cells is leukopenia when WBC is less than normal range it is caused.
(iii) If the count of Y decrease and reaches 1,50,000 the person will be affected by 'Thermobocytopenia'
(iv)The blood cell 'W' is red blood cells.
21.When 240 V is passed in the primary coil of a transformer, 480 Vis inducedin secondary coil, if there are 300 turns in primary coil how many turns will be in secondary coil?
(i) A transformer converts primary voltage 240 V into secondary voltage 300 V. When 480 V is induced in the primary coil, how many turns will be in secondary coil, if there are 300 turns in the primary coil?
Answer:
We use the transformer formula:
Vs / Vp = Ns / Np
Where:
Vs = Secondary voltage
Vp = Primary voltage
Ns = Number of turns in secondary coil
Np = Number of turns in primary coil
Given:
Vp = 240 V, Vs = 300 V, Np = 300 turns
First, find the turn ratio:
(300 / 240) = Ns / 300
⇒ Ns = (300 × 300) / 240 = 375 turns
Now for the second case:
When Vp = 480 V and using the same ratio:
Ns / 300 = 300 / 240
⇒ Ns = (300 × 480) / 240 = 600 turns
(i) Number of turns in secondary coil = 600 turns
(ii) Why is the core of a transformer laminated?
- The core of a transformer is laminated to reduce energy loss due to eddy currents.
Laminating the core increases electrical resistance and minimizes circulating currents that produce heat.
(iii) Can a transformer run successfully on a DC circuit? Give reason.
A transformer cannot work on a DC circuit because DC current does not produce a changing magnetic field.
Electromagnetic induction (needed to induce voltage in the secondary coil) requires a time-varying magnetic field,
which only AC current provides.
(i) Write any two advantages of this technology.
Answer:
1. It helps in improving the breed of animals by selecting genetically superior males.
2. It increases the chances of fertilization even if the male and female are far apart or if the male has low fertility.
(ii) Write two points to be considered while performing this technology.
Answer:
1. Sperms must be collected and stored in a hygienic and controlled environment to prevent contamination.
2. The procedure must be done at the correct time in the female's reproductive cycle to increase the chances of successful fertilization.
23. The mass of objects A and B is 6 × 10²⁴ kg and 400 kg respectively, and the radius of A is 6400 km.
(i) Calculate the gravitational force between the objects A and B.
Answer:
Using the formula:
F = (G × M × m) / r²
Where:
G = 6.674 × 10-11 Nm²/kg²
M = 6 × 1024 kg
m = 400 kg
r = 6400 km = 6.4 × 106 m
Substituting values:
F = (6.674 × 10-11 × 6 × 1024 × 400) / (6.4 × 106)²
F = 3910 N
Gravitational Force = 3910 N
(ii) What height should the body B be taken from the surface of the body A so that the value of acceleration due to gravity becomes 6 m/s²?
Answer:
Use the formula:
gh = g × (R / (R + h))²
Where:
gh = 6 m/s²
g = 9.8 m/s²
R = 6400 km = 6.4 × 106 m
6 / 9.8 = (R / (R + h))²
√(6 / 9.8) ≈ R / (R + h)
(R + h) / R ≈ √(9.8 / 6) ≈ 1.28
R + h = 1.28R
h = 0.28R = 0.28 × 6.4 × 106 = 1.792 × 106 m
Height = 1.792 × 10⁶ m = 1792 km
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