Students and Teacher's Forum

Students and Teachers Forum

1. Find the single equation of a pair of straight lines passing through the point (2,1) and perpendicular to the line represented by the pair of lines x^2+3xy-4y^2=0

To find the equation perpendicular to the given line, we need to factorise it. Consider x2 + 3 xy – 4y2 = 0.

Or, x2 + 4xy – xy – 4y2 = 0

Or, x(x + .....

2. वाक्य बनाउनुहोसः संसार छोड्नु।

बूढाबा चिसोको कारणले गर्दा हिजो बेलुका संसार छोडेछन् .....

3. T for true and f false
a. The colour of root and stem in a plant is the same. ()
b. The veinlets are irregularly arranged in leaves. ()
c. We can distinguish the monocot and dicot plants by observing their roots and leaves. ()
d. The examples of tap root system are grass and maize. ()
e. Chlorophyll is active at night as well. ()
f. Supporting roots are found in all plants. ()
g. The stem of all plants can stand straight .()
h. The mid rib transports food and water and gives support to the plant. ()
i. The edible part of potato is its stem. ()
j. The fleshy part of the prickly pear plant is not its leaf.

a. The colour of root and stem in a plant is the same. (F) b. The veinlets are irregularly arranged in leaves. (T) c. We can distinguish the monocot and dicot plants by observing their roots and leaves. (T) d. The examples of tap root system are .....

4. (क) ‘क्षयरोग’ शब्दको कारक र विभक्ति पहिचान गरी लेख्नुहोस् ।
(ख) अनुच्छेदको प्रथम वाक्यलाई मिश्र वाक्यमा परिवर्तन गर्नुहोस् ।
(ग) ‘अप्ठ्यारा’ र ‘हक’ शब्दका पर्यायवाची शब्द पहिचान गरी वाक्यमा प्रयोग गर्नुहोस् ।

१०. (क) क्षयरोगलेः करण कारक र तृतीया विभक्ति (ख) जब क्लारा पेरिसमा थिइन् तब उनको जीवन निकै कष्टकर .....

5. Solve:
2^x + ( 2 / 2^x ) = 3

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6. Rationalise the denominators
a. 5√3÷ 2√3 - √2

Here, to rationalise the denominators, we need to multiply and divide by (2√3 + √2). i.e; 5323- 2 ×23+ 223+ 2 = 10x 3 + 56 (23)2- (2)2 = 30 +5 64x3- 2 = 5(6 +6)10 =6 + √62 .....

7. Fill in the blanks.
a. .........determines the shape of a cell.

Answer: Cell wall determines the shape of a cell. Explanation: Cell wall determines the shape of the plant cell and cell membrane determines the shape of the animal cell. The cell wall which is very rigid and therefore forces .....

8. The polynomials h(x) = x³ - (a + b) x² - 4x + 2 and k(x) = x³ - 5x² - (2a -b)x + 2 are equal then find the value of a and b. Also find the degree of h(x) + k(x).

Since the two polynomials are equal, the cofficient of like terms must be equal. Hence, Comparing the coefficient of x .....

9. If A = {-1, 2, 3, 4, 5} and f(x) = 2x/(x + 4), then find the range of f(x).

Here, A = co-domian(x) = {-1, 2, 3, 4, 5} f(x) = y = 2x/(x+4) When, x = -1, y = 2(-1)/(-1 + 4) = -2/3 When x = 2, y = 4/6 = 2/3 When x = 3, y = 6/7 When x = 4, y = 8/8 = 1 when x = 5, y = 10/9. Thus range = {-2/3, 2/3, .....

10. One angle of a triangle is two-thirds of a right angle and the greater of two other exceeds the less by 20^g . Find all the angles in degree.

Let the angles are A , B and C. Then, A = 2 / 3 x 90 = 60o B= C + 20g = C + 20 x 9/10o = C + 18o [ Since, 1 .....

11. Write down the equation of straight line whose gradient is 0.4 and passes through point where P divides the line joining A( -5,4 ) and B( 3,1 ) is the ratio of 2:1.

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12. The co-ordinates of A, B and C are (6,3), (-3, 5) and (4, -2) respectively. If the co-ordinates of R is (a, b) then show that 49△ARB = ( 2a+9b-39)△ABC

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13. सन्तुष्टि कविताका मुख्य बुँदाहरू लेख्नुहोस् ।

सन्तुष्टि कविताको मुख्य बुँदा भरतराज पन्तद्वारा लिखित सन्तुष्टि कवितामा जीवनमा के कस्तो .....

14. १. जोडा मिलाउनुहोस् :
समूह ‘क’ समूह ‘ख’
स्वजन आकाश
आँचल पृथ्वी
आसमान अगेनु
अवनि पछ्यौरा
आकर्षक
आफन्त, नातेदार

२. खाली ठाउँ भर्नुहोस् :
क) ‘हात’ को पर्यायवाची शबद .......... हो । (बाहु, पाउ, चरण)
ख) ‘उठान’ को विपरीतार्थी शब्द .......... हो । (आरम्भ, बैठान, उडान)
ग) .......... अनेकार्थी शब्द होइन । (दर, दाना, छाना)
घ) .......... श्रुतिसमभिननार्थी शब्द हुन् । (पाली–पालि, नास–मास, तास–कास)

३. वाक्यमा प्रयोग गर्नुहोस् :
अन्तस्करण, हात्तीको मुखमा विरा

४.
(क) शुद्ध शब्द चिन्नुहोस् :
अ) विश्वशान्ति, बिश्वशान्ति, विश्बशान्ति, बिश्बशान्ति
आ) कुन्भकर्ण, कुंभकर्ण, कुम्भकर्ण, कुङ्भकर्ण

(ख) शुद्ध पारी लेख्नुहोस् :
फेरी विभीषणले भने “लडाइँमाजितेको भुभाग स्वतः विजेताको हुन्छ ।”

५. शब्दवर्ग छुट्याउनुहोस् :
हामीहरू सेता हिमाल, कलकल बग्ने नदी र सुरिला रुख देखेर मोहित हुँदै प्रकृतिको काखमा विचरण गर्यौं ।

१. स्वजनः आफन्त आँचलः पछ्यौरा आसमानः आकाश अवनिः पृथ्वी २. (क) बाहु (ख) बैठान (ग) छाना (घ) पालि र .....

15. १. तल समूह ‘क’ मा दिइएका शब्दका अर्थ समूह ‘ख’ बाट पहिचान गरी जोडा मिलाउनुहोस् :
समूह ‘क’ समूह ‘ख’
वाङ्मय विदेशबाट ल्याइएको
आयातित शत्रुता
विद्वेष भाषामा लेखिएको ग्रन्थ
सैनिक तालिम
चट्टान

२. कोष्ठकबाट मिल्ने शब्द छानी तलका खाली ठाउँ भर्नुहोस् :
क) ‘त्यान्द्रो’ .......... शब्द हो । (पर्यायवाची, अनेकार्थी, लघुतावाची)
ख) ‘साक्षर’ को विपरीतार्थी शब्द .......... हो । (अक्षर, शिक्षित, निरक्षर)
ग) ‘सूर्य’ को पर्यायवाची शब्द .......... हो । (निशाकर, निशाचर, दिवाकर)
घ) .......... श्रुतिसमभिन्नार्थी शब्द हुन् । (वर–पर, अगाडि–पछाडि, फेरि–फेरी)

३. अर्थ स्पष्ट हुने गरी वाक्यमा प्रयोग गर्नुहोस् :
जति जोगी आए पनि कानै चिरेका, लौ

४. (क) तलका शब्दमध्ये शुद्ध शब्द चिनेर लेख्नुहोस् :
अ) परिस्थीति, परिस्थिति, परीस्थिति, परिस्थिती
आ) संक्षिप्त, सङ्क्षीप्त, सङ्क्षिप्त, संक्षीप्त

५. रेखाङ्कित शब्दको शब्दवर्ग पहिचान गर्नुहोस् :
जनता परिश्रमी भएपछि यो देशले छिटोछिटो प्रगति गर्छ अनि हामी खुसी हुन्छौँ ।

१. वांगमयः भाषामा लेखिएको ग्रन्थ आयातीतः विदेशबाट ल्याइएको विद्वेशः शत्रुता कवाजः सैनिक .....

16. In which group of periodic table the given elements are placed?

The given elements are placed in group IA of the Modern Periodic Table. All these elements have only one valence electron in the valence shell of their atom. They form monovalent cations like Li+ , Na+, K+, etc. These elements are .....

17. Hydrogen is kept with metals inspite of that it is a non metal, why?

Answer: Although it is nonmetallic, hydrogen atoms do have some characteristics which make them behave like alkali metals in some chemical reactions. Explanation: Hydrogen has only 1 electron in its 1s orbital, so its electronic structure closely .....

18. Write 3 differences between action and reaction with definition...

Action Reaction 1. Occurence of nay event or performance of an activity. 1. Act done in the response to the stimulation. 2. Can be called as stimulating force. 2. Can be called as resisting force. 3. .....

19. Why silver and copper are used for making coins?

Copper, silver and gold are often called the "coinage metals" because they areused to make most of the world's coins. One reason for this isthat none of thecoinage metals is very reactive with other .....

20. Electroplating is done in cupper but not in silver metal. Give reason.

Iron is used for the electroplating of so copper because iron falls above copper in the electrochemical series whereas silver will fall off below the copper in electrochemical series that makes it not reliable for the electroplating .....

21. Alumunium is widely used for making cooking vessels like pressure cookers.Give reason.

Answer: Aluminium is a good conductor of heat. That's why it is extensively used for making cooking utensils. Explanation: Aluminum will form a layer of protective oxide that prevents further reaction. Aluminium is highly reactive .....

22. f) We should not ................ with disabled, sick, helpless and elderly people.
questionimage

We should not neglect, hate and misbehave with disabled, sick, helpless and elderly .....

23. Iron is not found in free state,why?

Iron is more reactive than some other metals . It can form compounds more easily and is hence placed above hydrogen in the reactivity series. It is mostly found in the form of iron oxide after reacting with oxygen and water . So , Iron is not .....

24. The first quartile of the given data is 8. Find the value of x:

Here, Table for Q1: Marks No.of students(f) c.f. 0 - 5 10 10 5 - 10 10 20 10 - 15 x 20 + x 15 .....

25. राष्ट्रियता र नागरिकतामा के फरक छ उल्लेख गर्नुहोस।

राज्यले आफ्नो नागरिकलाई पहिचान दिने प्रमाण नागरिकता हो । यो पहिचानको वैधानिक .....

26. कुनै ब्यक्ती प्रती मिनट 100m क दरले बृत्कर बाटोमा घुम्द 36sec म बृत्को केन्द्र 56⁰ कोण बनौछ भने उक्त बृत्तकर बाटोको परिधी पत्ता लगाउँउ होस ।

.....

27. द्वितीय विश्वयुद्वमा नेपालीको के कस्तो भुमिका रहेको थियो? चर्चा गर्नुहोस्।

नेपाली फौजले बेलायतका तर्फबाट जर्मनी तथा जापान विरुद्ध लडेको थियो । साइप्रस, .....

28. वर्तमान १४औँ योजनामा पर्यटनका सन्दर्भमा के कस्तो व्यवस्था गरेको छ उल्लेख गर्नुहोस्।

चौधौँ योजना (२०७३/०७४–२०७५/०७६) ले पर्यटन विकासका लागि नेपाललाई विश्वकै .....

29. Change the given word equation into a balanced chemical equation. What type of chemical reaction is it? What is the role of MnO₂ in this reaction?
Potassium Chlorate → Potassium Chloride + Oxygen

Potassium Chlorate → Potassium Chloride + Oxygen Balanced equation is 2KClO3 ⟶ 2KCl + 3O2. This is decomposition reaction, since one compound is breaking into two compounds. Here, MnO2 is a catalyst, which .....

30. Write any two difference between positive and negative catalyst.

Positive catalyst Negative catalyst 1. It increases the rate of a reaction without being used. 1. It decreases the rate of a reaction without being used. 2. It decreases the activation energy of reactant .....

31. Write a balanced chemical equation of decomposition reaction which is carried out by catalyst.

A balanced chemical equation of decomposition reaction which is carried out by catalyst is shown below: Potassium Chlorate-------MnO2(Catalyst)----→ Potassium Chloride + Oxygen Balanced equation is 2KClO3 ⟶ 2KCl + .....

32. Name the compound formed by chemical reaction between oxygen and carbon.

The compound formed by chemical reaction between oxygen and carbon are (i) Carbonmonooxide (CO) (ii) Carbondioxide .....

33. Define precipitate with an example.

In chemistry, a precipitate is an insoluble solid that emerges from a liquid solution. The emergence of the insoluble solid from solution is called precipitation. Often the precipitate emerges as a suspension. Precipitates can form when two soluble .....

34. Answer the questions on the basis of the electronic configuration of the elements given below.
A. 1s² 2s² 2p⁶ 3s¹
B. 1s² 2s² 2p⁶ 3s²3p⁵
i. Write the molecular formula of the compound formed by the combination of these elements.
ii. Write an equation for the reaction taking place between the aqueous solution of the compound formed above and silver nitrate solution. What type of reaction is this?

The given elements are: A - Sodium B - Chlorine (i) The compound formed by the combination of Sodium Chloride and its molecular formula is NaCl. (ii) The reaction taking place between the aqueous solution of the compound formed above .....

35. Answer the following questions according to electronic configuration of given elements.
A. 1s²2s² 2p²
B. 1s²2s² 2p⁴

i. Write the name of the compound formed, molecular formula and type of chemical bond formed by the combination of these two elements.

ii. Write down the balanced chemical equation when the above formed compound is dissolved in water.

iii. Write down the group, period and block of element 'A' in the periodic table.

The given elements are: A - Carbon B - Oxygen (i) The compound formed by the combination of carbon and oxygen is Carbon dioxide. The molecular formula of carbon dioxide is CO2. There are four covalent bonds formed between .....

36. What do you mean by domestic violence? Mention about its effect in brief.

The effects of domestic violence are presented below: - It breaks the peace in the family or in a society. - It creates conflicts among family members. - The children may suffer from anxiety, depression, etc. - It creates psychological tortures .....

37. Find the geometrical sequences whose second term is 6 and fifth term is 48.

You may have learnt to find the nth term of geometric series. tn = ar .....

38. The sum of three numbers in geometric series is 13/3 and their product is 1. Find the numbers

Let the three numbers in the geometric sequence be a/r , a and ar. From given condition, Product = 1. or, a/r . a . ar = 1 or, a3 = 1 .....

39. The four times of the arithmetic mean is five times of the geometric mean of two numbers. If the sum of arithmetic mean and geometric mean is 18, find two numbers

Let the numbers are a & b. From the first case, 4AM = 5GM or, 4(a + b)/2 = 5√ab [ Using formula of AM & GM.] or, 2(a + b) = .....

40. The sum of three numbers in ap is 12. If 2 is added to the third term then the resulting numbers are in gp. Find the numbers.

Let the terms in AP be a - d , a and a + d Since their sum is 12 or, a - d + a + a + d = 12 or, a = 4 And our numbers are 4 - d , 4 and 4 + d If we .....

41. One side of an equilateral triangle is 18 cm. The midpoints of its sides are joined to form another triangle whose midpoints, in turn are join to form still another triangle. The process is continued. Find the sum of the perimeter of all five triangles from the beginning.

Here, The perimeter of the given equilateral triangle = 3a = 18x3 = 54 cm. The perimeter of each next triangle is 2 times smaller, because its sides are the middle line of the previous triangle. .....

42. What are atria?

Atria is the plural form of atrium. The atrium is the upper chamber of the heart in which blood enters the heart. There are two atria in the human heart – the left atrium connected to the lungs, and the right atrium connected to the .....

43. State the locus made by pencil of a compass when the needle of the compass is fixed at a point and the pencil is rotated.

The locus made by pencil of a compass when the needle of the compass is fixed at a point and the pencil is rotated is a .....

44. The efficiency of any transformers is not 100%. Why ?

An ideal transformer would have no losses, and would therefore be 100% efficient. In practice energy is dissipated due both to the resistance of the windings (known as load loss), and to magnetic effects primarily attributable to the core .....

45. Write two difference between principal focus and focal length.

Focus is just a random point where some rays meet, it might be at the principal focus or otherwise. It also need no be placed on the principal axis of the .....

46. Why is the density of water maximum at 4 degree celsius?

Water never has an absolute density because its density varies with temperature. Water has its maximum density of 1g/cm3 at 4 degrees Celsius. When the temperature changes from either greater or less than 4 degrees, the density will become .....

47. Fuse is made of a alloy.Give reason

Fuse wires are made of Tin-lead alloy instead of copper due to various reasons. This wire is consist of low melting point as well as the have the high resistance. The alloy result in good functioning of the fuse. As the tin cause the good .....

48. y+ y-1-y= 1 [ Solve ]

.....

49. x+ x+13= 91x+13

[ Solve ]

.....

50. What is the formula of n(a)

n( a ) = n∘( a ) + n( a⋂b .....