SEE 2081 Karnali Province — Science Past Paper

Full marks: 75 · Time: 3 hours · With step-by-step model answers in Nepali & English.

Q1.
Group 'A' (Multiple Choice Questions) Choose the best alternative to the following questions and write it in the answer sheet. [10 x 1 = 10]
- (a) Which one of the following is a derived unit? (i) Candela (ii) Ampere (iii) Newton (iv) Mole
- (b) What is the reason for keeping the sea-urchin in phylum Echinodermata? (i) Due to the body being divided into head, thorax and abdomen (ii) Due to locomotion with the help of tube-feet (iii) Due to the body being flat and thin like a tape (iv) Due to them being found in moist soil and water
- (c) Which disease is caused due to a sudden deficiency of white blood cells in the blood? (i) Leukopenia (ii) Haemophilia (iii) Anaemia (iv) Leukaemia
- (d) In the given organism, what is the relationship between the caterpillar and the fungi? (Refer to the original diagram.) (i) Saprotrophic (ii) Parasitic (iii) Predator (iv) Symbiotic
- (e) What could be the weight of a body on the Earth if its weight on the Moon is 5 N? (i) 5/6 N (ii) 5 N (iii) 30 N (iv) 50 N
- (f) Which type of lens is thicker at the middle and thinner at the edges? (i) Concave lens (ii) Convex lens (iii) Plano convex (iv) Plano concave
- (g) Under what condition can a flat universe be hypothesized? (i) When the average density is greater than the critical density (ii) When the average density is less than the critical density (iii) When the average density and the critical density are equal (iv) When the average density and the critical density are not comparable
- (h) What are the products obtained in a reaction between nitric acid and sodium hydroxide? (i) NaNO3 + H2 (ii) NaCl + H2O (iii) NaNO3 + H2O (iv) NaNO3 + O2
- (i) What does carbogen indicate? (i) Mixture of carbon dioxide and nitrogen (ii) Mixture of carbon dioxide and hydrogen (iii) Mixture of carbon dioxide and water (iv) Mixture of carbon dioxide and oxygen
- (j) Which of the following hydrocarbon groups belong to the alkynes? (i) A and C (ii) A and B (iii) A and D (iv) B and C
Q2.
Group 'B' Write very short answers to the following questions. [9 x 1 = 9]
- (a) What is online reputation?
- (b) On the basis of their features, which one of these two is the less developed animal? (Refer to the original diagram: figure A and figure B.)
- (c) What is the name of the blood vessel that brings pure blood to the heart?
- (d) What is a magnetic field?
- (e) Why is the Big-Bang theory considered the most reliable theory among all the theories related to the origin of the universe?
- (f) Give an example of a combination reaction.
- (g) Write the molecular formula of the compound 'X' in the given chemical equation. X + H2SO4 -> Na2SO4 + H2O
- (h) Write the molecular formula of the acid formed when carbon dioxide gas is dissolved in water.
- (i) Which substance present in Reetha (soapnut) acts as the foaming agent?
Q3.
Group 'C' Write short answers to the following questions. [14 x 2 = 28] 3. Define a fundamental unit and give one example.
Q4.
Fern is not a flowering plant; cycas bears flowers but no fruit; banana bears flowers as well as fruits. However, all these plants are kept in the same division. Give any two reasons why they are all kept in the same division.
Q5.
Write any two differences between a drone bee and a worker bee.
Q6.
Why did Mendel choose the pea plant for his experiment? Give any two reasons.
Q7.
Two types of cell division are shown below.
- (i) What type of cell division does A represent?
- (ii) Write any one difference between these two types of cell division.
Q8.
Write the name of the plant that is used in the treatment of burns. Write one other use of this plant.
Q9.
If the weight of a cricket ball in water is 2 N and the weight of the water displaced by it is 1 N:
- (i) What is the actual weight of the cricket ball?
- (ii) On which principle is this experiment based?
Q10.
Water pipes burst in very cold places in winter. Write any two reasons for this.
Q11.
If a substance of mass 500 g needs 5980 J of heat to raise its temperature from 100 degree C to 226 degree C, calculate its specific heat capacity.
Q12.
State two reasons why a rainbow always appears semicircular and of the same thickness when seen from the surface of the Earth.
Q13.
A student inserted a burning matchstick into a gas jar and it was extinguished. Write the balanced chemical equation of the reaction that takes place when a burning magnesium ribbon is inserted into that same gas jar.
Q14.
Write any two differences between a mineral and an ore.
Q15.
Write the name and the structural formula of the alcohol having two carbon atoms.
Q16.
The use of detergent is harmful from an environmental point of view. Give any two reasons for this.
Q17.
Group 'D' Write long answers to the following questions. [7 x 4 = 28] 17. Write any two positive and any two negative effects of digital technology in daily life.
Q18.
Draw a chart to show both the phenotype and genotype of the offspring produced from dogs of black (BB) and white (bb) colour in the first (F1) and second (F2) filial generations according to Mendel's experiment. Also write the phenotype and genotype ratios of the second filial generation.
Q19.
The following results were obtained when the blood samples of four people were tested: A - RBC count is low B - WBC count is high C - Platelet count is low D - amount of sugar is high
- (i) The person with which blood sample bleeds more during injuries?
- (ii) The person with which blood sample becomes tired even after a short walk?
- (iii) The person with which blood sample needs to take antibiotics?
- (iv) The person with which blood sample could have problems in the kidney?
Q20.
State Newton's universal law of gravitation and prove that F = (G m₁ m₂) / d² with the help of an appropriate diagram.
Q21.
For the two lenses A and B given in the table, mention the type of each lens. Out of these two, which one forms a virtual and magnified image when an object is kept 15 cm away from the lens? Draw an appropriate ray diagram of this.
Q22.
Study the given figure.
- (i) Name the type of transformers X and Y.
- (ii) Write any two problems of transmitting electricity in the way shown in figure A.
Q23.
Answer the following questions about the periodic classification of elements.
- (i) State the modern periodic law.
- (ii (a)) Given Element A: 1s2 2s2 2p6 3s2 and Element B: 1s2 2s2 2p4 - in which group of the periodic table does element B lie?
- (ii (b)) Write the balanced chemical equation obtained in the reaction between elements A and B.

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