Students and Teacher's Forum

Students and Teachers Forum

The angle between a refracted ray and the normal drawn at the point of incidence to the interface at which refraction .....

2. Mrs. Gurung spends 75% of her income every month which amount to Rs. 9000 and the rest she saves in a bank.
i) Find her total income
ii) How much money does she saves in the bank?

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3. The population of a town increases by 5% every year. In the last year, the population of the town was 80000.
i) Find the present population of the town.
ii) Find the population of the town in the next year.

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4. Differentiate between
a. Baking soda and table salt

Baking soda is a leavening agent which causes baked goods to rise when your mixes it with acids such as citrus juices, buttermilk, vinegar, molasses, honey, cream of tartar and chocolate. The expansion effect remains inactive until combined with .....

5. Write about the last SAARC meeting.

Pakistan was scheduled to host the 19th annual South Asian Association for Regional Cooperation (SAARC) summit. However, after the terrorist attacks on the Indian army base in Uri, Kashmir, Indian Prime Minister Narendra Modi decided that India .....

6. Which part of turmeric is used to prepare yellow turmeric?
a. Leaf. B. Root
c modified. D. Flower

what is the vitamin found in yeast?
a. A. B. B.
c. C d d

a) Modified stem b) Vitamin .....

7. English to Nepali

tightly
through
expand
compressed
ventilation
regularly
possesses
quite
blow
float

1.कसिनु 2.मार्फत 3.विस्तार 4.संकुचित 5.वायुसंचार 6.नियमित .....

8. Classify the following on the basis of the taxonomy hierarchy

Bacteria
Maize
Hydra
Bat

b. Hydra Phylum - Coelenterata Class - Hydrozoa Order - Hydroida Suborder - Anthomedusae Genus - .....

9. What is sonometer?

A sonometer is a device used for studying transverse vibrations of a string. It is made up of a hollow box with a string attached to it. It is also called a monochord because it has only one string.

The string of a sonometer is at one .....

10. Differentiate between fathometer and sonometer.

A sonometer is a device used for studying transverse vibrations of a string. It is made up of a hollow box with a string attached to it. It is also called a monochord because it has only one string. The string of a sonometer is at one end of the .....

11. Glass is the transparent object. Give a reason.

Glass is transparent because the rays of light(Photons) are not absorbed. So the light can pass through it. If a light pass through any substance it becomes transparent.

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12. If B can do a piece of work 5 days faster than A and 4 days slower than C .And C can do a piece of work in same day the A and B can do together the, find A B and C.

Let in y days, B can do a piece of work. So, in 1 day B can do 1/y part of work. Then, in ( y + 5) days A can do a piece of work & in (y - 4) C and do it. So, in 1 day, A can do 1/(y+5) and C can do 1/(y - 4) part of work. According to .....

13. What is meant by political party? What conditions have to be fulfilled to establish a political party in nepal? Write down the roles of the political parties to institutionalize democracy in four points.

Conditions to establish a political party: Persons who are committed to common political ideology, philosophy and program may form and operate political parties. - A political party formed must register the party with the Election Commission upon .....

14. How does contruction work help to develop the infrastructure required for nation overall development?

Construction work may be defined as activities relating to improvement and the development of the present physical as well as the environmental conditions. It is closely related to improved standard of living of the people in a defined area. Some .....

15. AB & CD are the two towers standing on the same horizontal plane. From C, the angle depression of B is 30^o and from D, the angle of elevation of A is 45^o. If the shorter tower CD = 50 m, find the height of AB.

Here, CD = 50m, ∡ADE = 45o & ∡BDE = 30o ,CD= BE = 50m, AB = ? Now take a right angled tr.BED and tan & find DE. Again, use right angled triangle AED and use tan to find AE. Finally, AB = AE + BE Find .....

16. A tower subtends an angle of 60⁰ at a point on the same level as the foot of the tower. From another point 20m above the first, the angle of depression of the foot of the tower is 45⁰. Find the height of the tower.

Let, AB = x be the height of tower. From ∆BCD find BC, tan45°= CD / BC 1 = 20 /BC or, BC = 20 m Then use ∆ABC, tan60°= AB/BC √3 = AB/20 AB = 20√3 .....

17. There are two posts of heights 90 m and 30 m respectively. From the foot of the second, the elevation of the top of the first is found to be 60⁰. Find the elevation of the top of the second from the foot of the first.

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18. From the top of a cliff, 200 m high, the angle of depression of the top and bottom of a tower are observed to be 30⁰ and 60⁰. Find the height of the tower.

Height of the tower CD = BE = AB - AE .....

19. From the foot of the post the angle of elevation of the top of the tower is 45^o, and from the top of the post which is 30m heigh the angle of elevation is 30^o. Find the height and distanse of the tower.

Here, Let CD = height of post = 30m, ∡ADE = 30o & ∡ACB = 45o ,CD= BE = 50m, AB = ? & BC = ? Here, Now take a right angled tr.AED and tan & find DE in terms of AE. Again, take right .....

20. How is copper extracted? Explain in brief.

The concentrated ore is heated strongly with silicon dioxide (silica) and air or oxygen in a furnace or series of furnaces. The copper(II) ions in the chalcopyrite are reduced to copper(I) sulfide (which is reduced further to copper metal in the .....

21. Mention the formation process, appointment process, qualification and functions of CIAA.

Qualification: A person shall be eligible to be appointed as the Chief Commissioner or a Commissioner of the Commission for the Investigation of Abuse of Authority if he or she possesses the following qualification: - holding a bachelor's .....

22. What is meant by a political party? What conditions have to be fulfilled to establish a political party in Nepal? Write down the roles of the political parties to institutionalize democracy in four points.

23. Reproduce the following sentences as directed in the brackets.
a. I barely know you, .............? (Add a suitable tag question)
b. I know the answer. (Change into negative sentence)
c. No one can tolerate this. (Change into interrogative sentence)
d. Aditi ............ her room for the past hour. (Use the correct form of the verb "paint" )
e. She asked me if I was unwell. (Change into direct speech)
f. Cail anybody cure it? (Change into passive Voice)

5. a. I don't know the answer. b. Pokhara is richer than any other cities in Nepal. c. Mother asked the boy if he had locked the front door. d. People gave the minister a warm send-off. e. She liked white .....

24. Choose the correct options.

Once there lived an elephant in a forest nearby a village. ...........a..........(A/An/The)elephant used to go to a river..............b..........9to/for//by) a bath and drink. After bathing and drinking it would pass a tailor's shop. The tailor master........c............((used to give/was giv3em/gives) the elephant something to eat. They became good friends with the pace of time. One day the tailor's son had been in the shop. He was in angry mood.............d.............(because/so that/however) a pair of new suit.............e................9was nibbled/is nibbled/had been nibbled) by a shop. It stood in front of the shop with great hope. The tailor's son said to the elephant, ".......g.........(go away/to go away/that you go away) But the elephant waited a bit longer. The tailor's son picked a needle in the elephant trunk. The elephant gently walked away. the tailor's son was proud of his act,...........h.......(wasn't he/didn't he/was he) Soon the elephant came again. it had filled its trunk with rough water. It sprayed the water on all the clothes which.......i.........(were/was/had been0 in the shop belonging to customers. Thus, the elephant took revenge upon the tailor's son. If he hadn't picked the elephant, he ..........j......(wouldn't have borne? hadn't borne/ won't bear0 the loss.

a. the b. for c. used to d. because e. was nibbled f. feel g. go away h. wasn't he? i. were j. wouldn't have .....

25. Mention the formation process, functions, duties, and power of the national inclusion commission.

The functions, duties and powers of the National Inclusion Commission shall be as follows: - to conduct study and research works for the protection of the rights and interests of the communities, including KhasArya, minorities and marginalized .....

26. Reproduce the following sentences as directed in the brackets.
a. My sister lives parents. (into negative sentence)
b. None but he can play good cricket. (into affirmative sentence)
c. 'Will you help me?' the young girl asked. (into reported speech)
d. The window was opened by an unseen hand, (into active voice)
e. Everybody loves his motherland. (into simple past tense)
f. Let's drink tea, ......... _? (a question tag)

a. My sister doesn't live with my parents. b. Everyone can play good cricket. c. The young girl asked if I would help her. d. An unseen hand opened the window. e. Everybody loved their motherland. f. shall .....

27. Reproduce the following sentences as directed in the brackets.

a. The trip is very expensive, ................? (Add a suitable tag question)
b. The boy killed the spider with his shoe. (Change into negative sentence)
c. Nepal is known for its scenic beauty. (Change into interrogative sentence)
d. The athletes ................. for Canada tomorrow. (Use the correct form Of the verb leave" )
e. Roniya said to Ankita "You can speak Spanish well. " (Change into indirect speech)
f. Have you finished work? (Change into passive voice)

a. The trip is very expensive, isn't it? b. The boy didn't kill the spider with his shoe. c. Is Nepal known for its scenic beauty? or What is .....

28. Prove that:
1/sin70^o + √3/cos70^o = 4cos10^o/cos50^o.

Here, LHS = 1/sin70o + √3/cos70o = (cos70 + √3sin70) / (sin70 cos70) = 2(1/2 . cos70 + √3/2.sin70) / (sin70 cos70) [ Since, dividing and multiplying numerator by 2.] = 2( cos70 . cos60 .....

29. Prove that:
√[(1 + sin2A)/(1 - sin2A)] = cos2A/(1 + sin2A) = tan(45 - A)

Here, LHS = √[(1- sin2A)/(1 + sin2A)] = √[( sin2A + cos2A - 2sinA cosA) / ( sin2A + cos2A + 2sinA cosA) ] [ Since, using formula of cos2A, sin2A & sin2A + cos2A = 1.] Factorizing we get, = √[(cosA-sinA)2/(cosA .....

30. Prove that: cos2A/(1 + sin2A) = ( cosA - sinA)/(cosA + sinA) = (1 - tanA)/(1 + tanA).

Here, LHS = cos2A/(1 + sin2A) = (cos2A - sin2A) / ( sin2A + cos2A + 2sinA cosA) [ Since, using formula of cos2A, sin2A & sin2A + cos2A = 1.] Factorizing we get, = (cosA+sinA)(cosA - sinA)/(cosA + sinA)2 = (cosA .....

31. Prove that : 1/cos50^o + √3/sin50^o = 4cos20^o/cos10^o.

Here, LHS = 1/cos50o + √3/sin50o = (sin50 + √3cos50) / (sin50 cos50) = 2(1/2 . sin50 + √3/2.cos50) / (sin50 cos50) [ Since, dividing and multiplying numerator by 2.] = 2( sin50 . sin30 + .....

32. If a+b+c=180 cota/2.Cotb/2.Cotc/2=cota/2+cotb/2+cotc/2

Here, we have given, A + B + C = 180o Dividing both sides by 2, we get Or, A/2 + B/2 = 90o - C/2 Operating both sides by tan, Or, tan (A/2 + B/2) = tan (90o - C/2) Or, (tan A/2 + tanB/2) / (1 - tan A/2 tan B/2) = cot .....

33. A six-sided dice is thrown three times. Complete the tree diagram, showing at each branch the two events: 'three' and 'not three' (written 3 bar). What is the probability of throwing a total of
(a) three threes,
(b) no threes,
(c) one three,
(d) at least one three [use part (b)]?

Tree diagram: a) All three = P(333) = P(3).P(3).P(3) = 1/6.1/6.1/6 =.............Find it. b) No three = P(3'3'3') = 5/6.5/6.5/6 =..............Find it. Similarly complete .....

34. A pot Contains 3 red. 4 white and 5 green balls. Three balls are selected without replacement. Find the probability that the three balls chosen are:
(a) all red.
(b) all green.
(c) one of each colour.
(d) If the selection of the three balls was carried out 100 times, how often would you expect to choose three red balls?

Here, No.of red balls = n(R) = 3 No.of white balls = n(W) = 4 No.of green balls = n(G) = 5 No.of total balls = n(S) = 12 Now, Three balls are drawn without replacement. So (i)Probability of getting all are red = .....

35. Prove that:
1 +sin⁡2A1 –sin⁡2A=1 + tan A1 – tan A2=cot A + 12cot A – 12

Here, LHS = (1 + sin2A)/(1 - sin2A) = ( sin2A + cos2A + 2sinA cosA) / ( sin2A + cos2A - 2sinA cosA) [ Since, using formula of cos2A, sin2A & sin2A + cos2A = 1.] Factorizing we get, = (cosA+sinA)2/(cosA - .....

36. Prove that:
1-sin2θcos2θ=1-tanθ1+tanθ=tan⁡45o-θ

Here, RHS = tan(45o - θ) = [ tan45 - tanθ]/[1 + tan45.tanθ] [ Since, tan(A-B) = [ tanA - tanB] / [ 1 + tanA.tanB] Using, tan45o = 1, we get = ( 1 - tanθ)/(1 + tanθ) = .....

37. Prove that:
sin²A + sin²B + sin²C = 2(1 + cos A cos B cos C)

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38. Write the differences between image and shadow .

The difference between image and shadow is given below: Image Shadow 1.Image is an optical representation of real object. 1. A shadow is a dark area or shape cast on the ground or some surface by a body .....

39. Why is the demand for water growing in Nepal?

The total population of Nepal according to the national census 2068 is 26494504. The population is a changing phenomenon so it is increasing day by day. Along with the increase in the number of people, the need for water is also increasing. As .....

40. Why is it necessary to utilize vote properly?

Right to vote is one of the important aspects of democracy. It gives the life to democracy and helps to better the democratic conduct. So, we should utilize the vote properly for the following reasons: - A single vote can decide the selection of .....

41. Define adult franchise.

Adult Franchise is right to vote irrespective of religion, race, caste, creed, sex. The adult franchise is a key thing in a democracy. In other words, adult franchise means that the right to vote should be given to all adult citizens without .....

42. Find the volume of the given solid.

In this solid we can see the two cone. Let height of left cone = h & height og right cone is H. Then, total height = h + H = 15cm Now, Volume of solid = vol.of left cone + vol.of right cone .....

43. Use of butene

Uses of butene are as follow. It can be used as monomers to produce polymers. (such as high density polyethylene) It can be used as intermediates in petrochemical processes. can be used in the production of synthetic .....

44. Condense formula of sucrose.

Formula of Sucrose .....

45. Many laws have been made to abolish bad customs in Nepal, still, they are somehow in practices. Why has it happened? Give reasons.

Well, Nepal is in the list of least developed nations. About 21.6% of people are under the poverty line. Similarly, illiteracy is one of the reasons behind the practice of bad customs. We know that the illiterate people blindfoldly accept the .....

46. What are the non living characteristics of virus?

The non-living charcteristics of virus are: 1. They do not show the activities like nutrition, growth, reproduction outside the living cells. 2. They can be crystallized like a non-living things. 3.They do not have ribosomes and cellular .....

47. What are cryptogams?

Cryptogams are the plants those do not bear flowers and seeds. They reproduce by spores. Non-flowering plants are kept under this group. They are also known as "thallophytes", "lower plants", and "spore .....

48. What are the similarities between phanerogams and cryptogams.

Cryptogams are a subdivision of the phylogenetic system of classification of the plant kingdom. Cryptogams are less evolved primitive plants, and their plant body is not differentiated into leaves, stem, and roots. They do not bear seeds, fruits .....

49. A queen of heart is absent in a well-shuffled pack of playing cards. What is the probability of getting both the kings if two cards are drawn at random?

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50. Write a travel journal including your experience of traveling to the world heritage site?

Journey to Pashupatinath Temple, a world heritage site Last year, I visited the Pashupatinath .....