E-cikai
Past Papers Solutions
SEE Science
2075 Province-5(Lumbini)
Symbol No. ................
Answer all the questions.
The motion of a body under the influence of acceleration due to gravity only is called free fall.
Law of floatation states that weight of a floating body is equal to the weight of the fluid displaced by the body.
Heat energy possessed by a body is defined as sum of kinetic energy of all the molecules of the body.
Object should be kept at distance which is twice the focal length(f) apart from optical center (O) that means at 2F in front of convex lens to get magnification 1.
An alkali is a water soluble metal oxides or metal hydroxide.
Examples of thermosetting plastic are as follows:-
(i) Epoxy resin
Insulin decrease the glucose level in blood.
Effects seen from klinefelter's disorder are as follows:-
Upper part of the grafting is called scion and lower part is called stock.
Monohybrid cross is a cross in which only one mutually contrasting trait is considered from the parent.
For example, a cross between a pure dwarf pea plant and pure tall pea plant.Cross between a pure black haired male and a pure brown haired female. etc.
(i) Fuel:- Gobar gas plant produces methane(CH₄) gas. This gas can be used for cooking purpose.
(ii) Economy :- People now don't have to spend for kitchen fuel anymore.
(iii) Ecology :- Methane gas has 25 times severe greenhouse effect than carbon dioxide. Now this methane is used as fuel although upon burning gives carbon dioxide this reduces greenhouse effect.
(iv) Waste management :- Animal dung, kitchen and agricultural waste are dumped at proper place for producing fuel. This helps in solid waste management.
4.
Clinical thermometer is replaced by digital thermometer because of following reasons:-
(i) Health issue :- Exposure to mercury - even small amounts - may have toxic effects on the nervous, digestive and immune system, and on lungs, kidneys, skin and eyes.
(ii) Comfort :- It is easier to measure temperature. Auto alarm notifies about the completion of temperature measurement.
(iii) Non-contact measurement :- Infra-red thermometer can measure temperature without coming in contact with the body under measurement. This aids to safety to the health worker. It is widely used during corona pandemic regarding safety measures.
5.
15.
Solution
Given
Distance covered by the stone, S = 72 meters
Time taken by the stone too cover the distance, t = 6 seconds
As the stone is falling totally under the influence of gravity and toward the earth surface the acceleration is due to gravity and positive.
Initial velocity,u = 0 m/s (∵ Stone is initially in rest)
We have,
S = ut + 1/2 gt²
Or, 72 = 0*6 + 1/2 (g*6²)
Or, 72 = (36¹⁸ g)/2
Or, 72 = 18 g
Or, g = 72/18
∴ g = 4 m/s²
Hence the acceleration due to gravity,g is 4 m/s².
Acceleration due to gravity, g = GM/D².
From this equation we conclude that acceleration due to gravity is zero at distance which is infinitely far apart from the center of the earth or at the surface of sphere around the center of the earth where mass of the earth occupied by the sphere is zero which is at the center of the earth.
Or in short,
ii) The causes of myopia (short-sightedness) can be either any one or both of the following:-
(a) Eye lens become thicker.
(b) Eyeball becomes longer than the focusing power of cornea and eye lens.
22.
i) Element indicated by A is magnesium(Mg) and element indicated by B is chlorine(Cl).
ii) If aluminium(Al) is reacted with B aluminium chloride is formed. Its molecular formula is AlCl₃.
iii) Valency of element C is 1. It is alkali metal. It strongly reacts with water to form metallic hydroxide and the reaction is exothermic.
iv) Element C is potassium (K).The balanced chemical reaction between C and B is as follows:-
23.
i) A is white blood cell (leukocytes).
B is blood platelets (thrombocytes).
C is red blood cell (erythrocytes).
ii) If blood cell A is present in more number in the blood leukaemia occurs.
iii) If blood cell C is present in less number in the blood anaemia occurs.
iv) If a man cuts his hand and blood does not clot, blood cell B (platelets) is present in less number in the blood.
24.
i) Ozone layer depletion is the cause behind it.
ii) Following measure should be taken to control it:-
(a) Reduction in emission of CFCs (Chloro-fluoro-carbon) gases.
(b) Reduction in the emission of green house gases.
iii) Temperature increase. This adversely affects the environment. Its effects are as follows:-
(a) Global warming.
(b) Ocean level increases and many settlement areas get under the the ocean water.
RE-111 'EP'
SEE 2075 (2019)
Answer all the questions.
Group 'A' 15x1=15
1. Write short answer of the following questions.
a. What is free fall?
The motion of a body under the influence of acceleration due to gravity only is called free fall.
b. State the law of floatation.
Law of floatation states that weight of a floating body is equal to the weight of the fluid displaced by the body.
c. Define heat energy in terms of kinetic energy of molecules.
Heat energy possessed by a body is defined as sum of kinetic energy of all the molecules of the body.
d. Where should be object kept in front of convex lens to get magnification 1?
Object should be kept at distance which is twice the focal length(f) apart from optical center (O) that means at 2F in front of convex lens to get magnification 1.
e. Write the name of high quality coal.
Anthracite is high quality coal.
f. Define promotor.
Prompter is defined as substance which increases the activity of a catalyst in a chemical reaction.
g. What is an alkali?
An alkali is a water soluble metal oxides or metal hydroxide.
eg:- Potassium hydroxide(KOH)
Sodium hydroxide (NaOH)
Calcium oxide (CaO) etc.
Sodium hydroxide (NaOH)
Calcium oxide (CaO) etc.
h. Write two ores of silver.
Ores of silver are listed below:-
(i) Argentite
(ii) Chlorargyrite (Horn silver)
(iii) Galena
(iv) Copper silver glance
(v) Ruby silver
(i) Argentite
(ii) Chlorargyrite (Horn silver)
(iii) Galena
(iv) Copper silver glance
(v) Ruby silver
i. Write two examples of thermosetting plastic.
Examples of thermosetting plastic are as follows:-
(i) Epoxy resin
(ii) Melamine formaldehyde
(iii) Polyester resin
(iv) Urea formaldehyde
(iii) Polyester resin
(iv) Urea formaldehyde
j. Write the main function of insulin hormone.
Insulin decrease the glucose level in blood.
k. What is blood pressure.
Blood pressure is the pressure exerted by the blood flow to the wall of arteries.
l. Write any two effects seen from klinefelter's disorder.
Effects seen from klinefelter's disorder are as follows:-
(i) Broader hips
(ii) Low serum testosterone level
(iii) Mental retardation
(iv) Sparse body hair
(v) Sterility in males
(ii) Low serum testosterone level
(iii) Mental retardation
(iv) Sparse body hair
(v) Sterility in males
m. Write the name of upper part and lower part used in grafting.
Upper part of the grafting is called scion and lower part is called stock.
n. Define monohybrid cross.
Monohybrid cross is a cross in which only one mutually contrasting trait is considered from the parent.
For example, a cross between a pure dwarf pea plant and pure tall pea plant.Cross between a pure black haired male and a pure brown haired female. etc.
o. What is fossil?
Fossil is the remnant of dead plants and animals which died millions of years ago.
Group 'B' 13x2=26
2.
The balloon blasts.
Pressure exerted by air inside the balloon to the inner wall of balloon is equal to the atmospheric pressure of the surrounding where air is inflated inside the balloon. Also, atmospheric pressure falls with increase in altitude. At very high altitude the inner air pressure of the balloon exceeds the atmospheric pressure at high altitude and air inside the balloon escapes from the balloon and the balloon blasts.
What happens to a balloon filled with air, when it goes very high altitude from surface of earth? Why?
The balloon blasts.
Pressure exerted by air inside the balloon to the inner wall of balloon is equal to the atmospheric pressure of the surrounding where air is inflated inside the balloon. Also, atmospheric pressure falls with increase in altitude. At very high altitude the inner air pressure of the balloon exceeds the atmospheric pressure at high altitude and air inside the balloon escapes from the balloon and the balloon blasts.
3.
The benefits of using gobar gas in rural area of Nepal are as follows:-
Gobar gas is more beneficial in rural area of Nepal. Give two reasons.
The benefits of using gobar gas in rural area of Nepal are as follows:-
(i) Fuel:- Gobar gas plant produces methane(CH₄) gas. This gas can be used for cooking purpose.
(ii) Economy :- People now don't have to spend for kitchen fuel anymore.
(iii) Ecology :- Methane gas has 25 times severe greenhouse effect than carbon dioxide. Now this methane is used as fuel although upon burning gives carbon dioxide this reduces greenhouse effect.
(iv) Waste management :- Animal dung, kitchen and agricultural waste are dumped at proper place for producing fuel. This helps in solid waste management.
4.
Nowadays clinical thermometer is replaced by digital thermometer. Why?
Clinical thermometer is replaced by digital thermometer because of following reasons:-
(i) Health issue :- Exposure to mercury - even small amounts - may have toxic effects on the nervous, digestive and immune system, and on lungs, kidneys, skin and eyes.
(ii) Comfort :- It is easier to measure temperature. Auto alarm notifies about the completion of temperature measurement.
(iii) Non-contact measurement :- Infra-red thermometer can measure temperature without coming in contact with the body under measurement. This aids to safety to the health worker. It is widely used during corona pandemic regarding safety measures.
5.
Write any two reasons for using nichrome wire as a heating element.
Reasons for using nichrome wire in electric heater are:-
(i) Nichrome is resistant to air corrosion at high temperature.
(ii) Nichrome has melting point of 1400 ºC.
6.
Ca + H₂SO₄ → CaSO₄ + H₂↑
This is single displacement reaction.
7.
Differences between PVC and Bakelite are as follows:-
8.
Hydrochloric acid(HCl) does not have carbon atom in it that is why it is not an organic acid.
(i) Nichrome is resistant to air corrosion at high temperature.
(ii) Nichrome has melting point of 1400 ºC.
6.
Write a chemical reaction between calcium and sulphuric acid. Mention the type of chemical reaction.
Ca + H₂SO₄ → CaSO₄ + H₂↑
This is single displacement reaction.
7.
Write down any two differences between PVC and Bakelite.
Differences between PVC and Bakelite are as follows:-
 |
| Differences between PVC and Bakelite |
8.
Though hydrochloric acid is formed inside our body, it is not called organic acid. Why?
Hydrochloric acid(HCl) does not have carbon atom in it that is why it is not an organic acid.
9.
The density of iron is 7.87 g/cm³ . Iron is about three times denser(heavier) than aluminum. It is not used to make body parts of aeroplane because of following reasons:-
(i) Weight :- As iron is relatively denser than aluminum. Iron built aeroplane will obviously weigh heavier than aluminum built aeroplane.
(ii) Power :- As iron built aeroplane is heavier than aluminum built aeroplane. More power is needed while taking off and landing.
(iii) Fuel :- More power requirement by iron built aeroplane requires more fuel.
(iv) Flying cost :- As iron built aeroplane requires more fuel hence fuel expense increases which adds to the flying cost.
In general, iron is not used to make body parts of aeroplane. Why? Give any two reasons.
The density of iron is 7.87 g/cm³ . Iron is about three times denser(heavier) than aluminum. It is not used to make body parts of aeroplane because of following reasons:-
(i) Weight :- As iron is relatively denser than aluminum. Iron built aeroplane will obviously weigh heavier than aluminum built aeroplane.
(ii) Power :- As iron built aeroplane is heavier than aluminum built aeroplane. More power is needed while taking off and landing.
(iii) Fuel :- More power requirement by iron built aeroplane requires more fuel.
(iv) Flying cost :- As iron built aeroplane requires more fuel hence fuel expense increases which adds to the flying cost.
10.
Silkworm is an useful insect because of following benefits it provides:-
(i) Silk thread :- Silk thread is obtained from silkworm.
(ii) Food :- After extraction of silk from pupae the remaining pupae is used by chinese and many other silk producing asian countries as food. Around 10,000 cocoons are required to produce 1kg raw silk. So millions of silkworms are reared by farmer. All the died pupae are used as food. It is also used as pets feeder.
(iii) Non-absorbable surgical suture :- The guts of silkworm are used as raw material for making silk surgical suture. This suture is not decomposed by our body.
(iv) Employment :- Sericulture is a good means of generating income.
Write any two reasons that silkworm is useful insect.
Silkworm is an useful insect because of following benefits it provides:-
(i) Silk thread :- Silk thread is obtained from silkworm.
(ii) Food :- After extraction of silk from pupae the remaining pupae is used by chinese and many other silk producing asian countries as food. Around 10,000 cocoons are required to produce 1kg raw silk. So millions of silkworms are reared by farmer. All the died pupae are used as food. It is also used as pets feeder.
(iii) Non-absorbable surgical suture :- The guts of silkworm are used as raw material for making silk surgical suture. This suture is not decomposed by our body.
(iv) Employment :- Sericulture is a good means of generating income.
11.
A karyotype of 45,XO chromosomes indicates Turner's syndrome. In this chromosomal disorder either one X sex chromosome is completely missing or partially missing in the cell of a female.
Some symptoms of Turner syndrome are as follows:-
(i) Short stature :- Smaller height than average.
(ii) Lower intelligence :- They have difficulties with directional sense, learning math, nonverbal memory and attention.
(iii) Underdeveloped physical features :- Female with turner syndrome has short neck with a webbed appearance. She also may have a broad chest with widely spaced nipple.
(iv) Gonadal dysgenesis :- Females with turner syndrome may not have well developed ovaries.
A cell of girl contain only 45, XO chromosomes, which types of chromosome disorder is present in her body? Write any one symptom of it?
A karyotype of 45,XO chromosomes indicates Turner's syndrome. In this chromosomal disorder either one X sex chromosome is completely missing or partially missing in the cell of a female.
Some symptoms of Turner syndrome are as follows:-
(i) Short stature :- Smaller height than average.
(ii) Lower intelligence :- They have difficulties with directional sense, learning math, nonverbal memory and attention.
(iii) Underdeveloped physical features :- Female with turner syndrome has short neck with a webbed appearance. She also may have a broad chest with widely spaced nipple.
(iv) Gonadal dysgenesis :- Females with turner syndrome may not have well developed ovaries.
12.
Difference between binary fission in amoeba and budding in yeast are as follows:-
13.
There are two copies of each genes. Offsprings obtained from same parents have two copies of each genes inherited from each parent. Different offspring get inherited with some similar genes. but not all genes copies are same. This difference in gene copies brings variation in offsprings. That is why, offsprings obtained from same parents show some similarities but they are not exactly similar to each other.
Write any two differences between binary fission in amoeba and budding in yeast.
Difference between binary fission in amoeba and budding in yeast are as follows:-
 |
| Binary fission in amoeba Vs budding in yeast |
13.
Offsprings obtained from same parents show some similarities but they are not exactly similar to each other. Why? Write with reason.
There are two copies of each genes. Offsprings obtained from same parents have two copies of each genes inherited from each parent. Different offspring get inherited with some similar genes. but not all genes copies are same. This difference in gene copies brings variation in offsprings. That is why, offsprings obtained from same parents show some similarities but they are not exactly similar to each other.
14.
Some application of artificial satellites are as follows:-
(i) Navigation :- Widely used and familiar technology GPS(Global positioning system) is uses satellite to show exact position.
(ii) Communication
(iii) Weather forecasting
(iv) Earth observation.
Write any two applications of artificial satellites.
Some application of artificial satellites are as follows:-
(i) Navigation :- Widely used and familiar technology GPS(Global positioning system) is uses satellite to show exact position.
(ii) Communication
(iii) Weather forecasting
(iv) Earth observation.
Group 'C' 6x3=18
15.
A stone dropped freely from 72 m height of the tower and reaches the ground in 6 seconds. Calculate acceleration due to gravity of that stone.At what condition does the acceleration due to gravity becomes zero.
Solution
Given
Distance covered by the stone, S = 72 meters
Time taken by the stone too cover the distance, t = 6 seconds
As the stone is falling totally under the influence of gravity and toward the earth surface the acceleration is due to gravity and positive.
Initial velocity,u = 0 m/s (∵ Stone is initially in rest)
We have,
S = ut + 1/2 gt²
Or, 72 = 0*6 + 1/2 (g*6²)
Or, 72 = (
Or, 72 = 18 g
Or, g = 72/18
∴ g = 4 m/s²
Hence the acceleration due to gravity,g is 4 m/s².
Acceleration due to gravity, g = GM/D².
From this equation we conclude that acceleration due to gravity is zero at distance which is infinitely far apart from the center of the earth or at the surface of sphere around the center of the earth where mass of the earth occupied by the sphere is zero which is at the center of the earth.
Or in short,
The acceleration due to gravity becomes zero at the centre of the earth.
16.
Solution
Given
Heat energy supplied, Q = 4.2x10³ KJ
= 4.2x10³x10³ J
= 42 x 10⁵ J
Mass of water, m = 20 kg
Specific heat capacity of water, s = 4200J/kgºC
Initial temperature, T₀ = 40ºC
Final temperature, T₁ = ?
We have ,
From heat equation
Q = m.s. (T₁-T₀)
Or, 42 x 10⁵ J = 20 kg * 4200J/kgºC * (T₁- 40ºC)
If a heater with power 2000W runs one hour, it gives 4.2x10³ KJ heat. What will be the temperature increased in 20 kg of water with temperature 40ºC by that heat? (Specific heat capacity of water is 4200J/kgºC)
Solution
Given
Heat energy supplied, Q = 4.2x10³ KJ
= 4.2x10³x10³ J
= 42 x 10⁵ J
Mass of water, m = 20 kg
Specific heat capacity of water, s = 4200J/kgºC
Initial temperature, T₀ = 40ºC
Final temperature, T₁ = ?
We have ,
From heat equation
Q = m.s. (T₁-T₀)
Or, 42 x 10⁵ J = 20 kg * 4200J/kgºC * (T₁- 40ºC)
Or, 42 x 10⁵ J /(20 kg * 4200J/kgºC) = (T₁- 40ºC)
Or, 42 x 10⁵ ºC/ ( 2* 42 * 10³) = (T₁- 40ºC)
Or, (T₁- 40ºC) = 100 /2 ºC = 50ºC
Or, T₁ = 50 ºC + 40 ºC
∴ T₁ = 90 ºC
After heating the temperature of the water rises to 90 ºC.
17.
A diagram showing laboratory preparation of ammonia gas is drawn below:-
Or, 42 x 10⁵ ºC/ ( 2* 42 * 10³) = (T₁- 40ºC)
Or, (T₁- 40ºC) = 100 /2 ºC = 50ºC
Or, T₁ = 50 ºC + 40 ºC
∴ T₁ = 90 ºC
After heating the temperature of the water rises to 90 ºC.
17.
Draw a diagram of laboratory preparation of ammonia gas and label any four parts. Why this gas can not be collected in the gas jar by downward displacement of water.
A diagram showing laboratory preparation of ammonia gas is drawn below:-
Ammonia gas is highly soluble in water. It reacts with water to form ammonium hydroxide (NH₄OH). That is why ammonia gas is not obtained by downward displacement of water.
18.
Monohydric alcohol is represented by general formula CnH₍₂n₊₁₎OH.
If value of n is 2 in this formula ethanol (C₂H₅OH) is formed.
Structural formula of ethanol is as follows:-
If OH of this compound is replace by H ethane is formed. Its molecular formula is C₂H₆.
Which compound is represented by general formula CnH₍₂n₊₁₎OH ? If value of n is 2 in this formula which compound is formed? Write its structural formula. If OH of this compound is replaced by H which compound is formed? Write its name and molecular formula.
Monohydric alcohol is represented by general formula CnH₍₂n₊₁₎OH.
If value of n is 2 in this formula ethanol (C₂H₅OH) is formed.
Structural formula of ethanol is as follows:-
If OH of this compound is replace by H ethane is formed. Its molecular formula is C₂H₆.
19.
The diagram of brain is given below:-
Damage of medulla oblongata causes sudden death.
Draw a diagram of different parts of brain. Damage of which part of brain causes sudden death? Show this part in diagram.
The diagram of brain is given below:-
Damage of medulla oblongata causes sudden death.
20.
Some applications of forest in our daily life:-
(i) Forest mitigates the effects of soil erosion and landslides.
(ii) Forest absorbs carbon dioxide and reduces the effect of greenhouse.
(iii) Shelter for wildlife.
(iv) Forest provides wood for timber, fodder for cattle, and a source for bio-mass fuel.
(v) Forest is home of various medicinal and valuable plants.
(vi) Forest can be used to promote tourism by proper planning as picnic destination, wildlife hunting , jungle safari and many more.
Write any three applications of forest in our daily life.
Some applications of forest in our daily life:-
(i) Forest mitigates the effects of soil erosion and landslides.
(ii) Forest absorbs carbon dioxide and reduces the effect of greenhouse.
(iii) Shelter for wildlife.
(iv) Forest provides wood for timber, fodder for cattle, and a source for bio-mass fuel.
(v) Forest is home of various medicinal and valuable plants.
(vi) Forest can be used to promote tourism by proper planning as picnic destination, wildlife hunting , jungle safari and many more.
Group 'D' 4x4=16
21.
i) Myopia
Study the given diagram and answer thefollowing questions.
i) What type of defect of vision is in the diagram of eye?
ii) What is the cause of this defect of vision?
iii) What is to be done to remedy such defect?
iv) Draw a diagram to show the remedy of this defect.
i) Myopia
ii) The causes of myopia (short-sightedness) can be either any one or both of the following:-
(a) Eye lens become thicker.
(b) Eyeball becomes longer than the focusing power of cornea and eye lens.
iii) A concave lens of suitable focal length should be embedded in the eye wearing glass to remedy such defect.
iv) The given below diagram shows the remedy of myopia:-
iv) The given below diagram shows the remedy of myopia:-
22.
Study the given table and answer the given questions. Name of elements Electronic configuration
i) Write the name of elements indicated by A and B.
ii) Keeping aluminium instead of A, which product would you expect? Write molecular formula of it.
iii) Write valency of element C and chemical nature of it.
iv) Write the balanced chemical equation when 'C' reacts with 'B'.
i) Element indicated by A is magnesium(Mg) and element indicated by B is chlorine(Cl).
ii) If aluminium(Al) is reacted with B aluminium chloride is formed. Its molecular formula is AlCl₃.
iii) Valency of element C is 1. It is alkali metal. It strongly reacts with water to form metallic hydroxide and the reaction is exothermic.
iv) Element C is potassium (K).The balanced chemical reaction between C and B is as follows:-
K + Cl → KCl
23.
Blood cells contain in blood of normal man is shown in chart. Study it and answer the following questions.
i) Name A, B and C.
ii) Which disease may occur if A is present in more number of blood?
iii) Which disease may occur if C is present in less number in blood?
iv) If a man cuts his hand and blood does not clot, which one is present in less in blood among A, B and C?
i) A is white blood cell (leukocytes).
B is blood platelets (thrombocytes).
C is red blood cell (erythrocytes).
ii) If blood cell A is present in more number in the blood leukaemia occurs.
iii) If blood cell C is present in less number in the blood anaemia occurs.
iv) If a man cuts his hand and blood does not clot, blood cell B (platelets) is present in less number in the blood.
24.
Consequences like skin burn and skin cancer were observed when people take sunbath on earth surface. On the basis of it answer the given questions.
i) What is the cause of it?
ii) What is to be done for the control of it?
iii) In such condition, what is the effect of temperature on environment? Write any two effects.
i) Ozone layer depletion is the cause behind it.
ii) Following measure should be taken to control it:-
(a) Reduction in emission of CFCs (Chloro-fluoro-carbon) gases.
(b) Reduction in the emission of green house gases.
iii) Temperature increase. This adversely affects the environment. Its effects are as follows:-
(a) Global warming.
(b) Ocean level increases and many settlement areas get under the the ocean water.