SEE 2081 Sudurpashchim Province — Science Past Paper

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

Q1.
Section A - Multiple Choice Questions. Choose the best alternative to the following questions and write it in the answer sheet. (10 x 1 = 10)
- (a) How many bits are there in 1 byte? (i) 2 (ii) 4 (iii) 6 (iv) 8
- (b) Which one of the following is a plant that bears flowers, has fibrous roots and no branches? (i) Fern (ii) Maize (iii) Mustard (iv) Cycas
- (c) Which order is right in terms of evolution? (i) earthworm, jellyfish, frog, fish (ii) jellyfish, earthworm, frog, fish (iii) earthworm, jellyfish, fish, frog (iv) jellyfish, earthworm, fish, frog
- (d) Volcanic eruption (A) and over-use of fossil fuels (B) are two causes of climate change. Which of the following is correct about these? (i) A is a natural cause and B is a human cause (ii) A is a human cause and B is a natural cause (iii) Both A and B are human causes (iv) Both A and B are natural causes
- (e) If the radius of the Earth is halved keeping the mass constant, how will the value of acceleration due to gravity g change? (i) becomes 1/2 times the original value (ii) becomes 1/3 of the original value (iii) becomes 4 times the original value (iv) becomes 6 times the original value
- (f) In the adjoining figure, how much weight can be balanced on Piston B? (i) 100 N (ii) 150 N (iii) 200 N (iv) 250 N
- (g) Which situation is correct when a ray of light enters glass from air and then emerges back into the air? [i = angle of incidence, r = angle of refraction, e = emergent angle] (i) i = e < r (ii) i = e = r (iii) i > e = r (iv) i = e > r
- (h) Due to which force do the heavenly bodies (masses) in the universe remain in their positions? (i) Nuclear force (ii) Gravitational force (iii) Magnetic force (iv) Electro-magnetic force
- (i) Which type of chemical reaction is given below? Zn + HCl -> ZnCl2 + H2 (i) Combination (ii) Decomposition (iii) Displacement (iv) Neutralization
- (j) Fruit sellers use a certain white powder to ripen fruits. What could be the name of this chemical? (i) Sodium Sulphate (ii) Sodium Carbonate (iii) Calcium Carbide (iv) Calcium Carbonate
Q2.
Section B - Write very short answers to the following questions. (9 x 1 = 9)
- (a) Write a difference between fundamental unit and derived unit.
- (b) Name the force applied by water in the upward direction on a body immersed in it.
- (c) Why does a ray of light bend towards the normal while refracting from air to glass?
- (d) To which phenomenon of light is the given figure related? (Refer to the original figure.)
- (e) Give one reason why the wire vibrates when current is passed through the coil of wire placed between the magnet poles. (Refer to the original figure.)
- (f) Write one condition necessary for a closed universe.
- (g) Define ore.
- (h) Which concentration method is applied during the purification of iron from its ore?
- (i) Why are hydrocarbons called organic compounds?
Q3.
In an observation of how the growth rate of plants differs in a lighted room and a dark room, name one independent variable and one dependent variable.
Q4.
Write the phylum of the following organisms:
- (i) (i) Slug
- (ii) (ii) Sea-cucumber
Q5.
Write any two advantages of bee-keeping for farmers.
Q6.
Why is meiosis cell division called reduction division? What is a diploid cell?
Q7.
What is In-Vitro Fertilization (IVF)? Explain briefly about it.
Q8.
Write one use each of Turmeric and Asiatic Pennywort.
Q9.
Write the name of the disease that shows the following symptoms:
- (i) (i) Headache, reddish face, nose bleeding, sweating
- (ii) (ii) Excess appetite and thirst, frequent urination, weight loss
Q10.
The value of acceleration due to gravity is more in the polar region than in the equatorial region. Why?
Q11.
Write any two differences between acceleration due to gravity (g) and gravitational constant (G).
Q12.
What type of transformer is shown in the figure? If the potential difference in coil A is 700 V, calculate the voltage produced in coil B.
Q13.
Name an instrument in which an electromagnet is used, and write one use of that instrument.
Q14.
Beaker A contains dilute HCl at 30 °C and beaker B contains dilute HCl at 20 °C. If limestone pieces of the same size are placed in both beakers, in which beaker will the reaction take place faster? Why?
Q15.
One student made a model of methane and another made a model of propane. The teacher removed one hydrogen atom from the end of each model and joined the two together. Which hydrocarbon is now formed? Also write its structural formula.
Q16.
Write any two precautions to be taken while using insecticides.
Q17.
Write any two positive and two negative effects of using online social media.
Q18.
Can a white child be born even though both parents are black? Explain on the basis of Mendelism with a suitable chart and reason.
Q19.
- (a) An iron ball of mass 1 kg at 80 °C is cooled to 20 °C. How much heat energy is lost by the iron ball? (Specific heat capacity of iron = 460 J/kg°C.)
- (b) Draw a graph that shows the relationship between temperature and volume when water is heated from 0 °C to 10 °C.
Q20.
- (a) Diamond shines more than glass. Write two reasons why.
- (b) Draw a diagram to show the splitting of white light into seven colours when it passes through a prism. Label the colours in the correct order.
Q21.
Write the names of three proteins found in plasma. What is the plasma called after the protein that helps in blood clotting has been removed from it?
Q22.
Which element is more reactive between sodium and potassium, and why? Write the electronic configuration of chlorine on the basis of sub-shells, and state its group in the periodic table.
Q23.
Draw a neat diagram of the apparatus used to prepare ammonia gas in the laboratory and label any one part. What is the function of the lime tower used in this process?

Open each question on Ujyalo to see the full model answer, marking scheme and step-by-step working — free with an account.