Students and Teachers Forum

1. Name a place in Nepal where mineral zinc is found. Also, write its one use.

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2. Find the single equation of pair of straight lines passing through the origin and perpendicular to the lines represented by 3x2 - xy - 2y2 = 0.

Given equation of pair of lines : 3x2 - xy - 2y2 = 0 Factorising the given equation,

3x2- (3 -2)xy - 2y2 = 0 3x2- 3xy + 2xy - 2y2 = 0 3x(x - y) +2y (x - y) = 0 (x - y) (3x + 2y) = 0

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3x + 2y .....

3. Show any two differences between sodium carbonate and sodium bicarbonate.

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4. What should be done to remove the temporary hardness of water? Explain with reaction. 

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5. Show 1/1 use of glycerol and sodium bicarbonate.

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6. People use glycerol in their hards and legs during winter, why?

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7. How is the hardness of water removed? Give an examples of source of soft water.

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8. Write any two differences between hard water and soft water.

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9. What is hard water? How could we remove the permanent hardness of water?

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10. If f(x) = 2x+58 and g(x) = 3x - 4 are given funtions, show that  (fog)-1(x) is an identity function. Also find the value of x.

Here, f(x) = 2x+58 and g(x) = 3x - 4. Now, fog(x) = f(3x - 4)                        =  2(3x - 4) +58                 .....

11. If the mass of an object is 25 kg and value of acceleration due to gravity is 9.8 m/s2 . Then find its acceleration .  

Given by the question, mass (m) = 25 kg gravity (g) = 9.8 m/s2 acceleration (a) = ? Use this formula first, F = m ⨉ g Then you can find out the F, Again  Use this formula  F = m ⨉a Then you can find the .....

12. Why are meristematic tissue and permanent tissue different? Clarify in two points.

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13. Clarify the relationship between cell, tissue and organ in a human body.

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14. Calculate the diagonal of square whose side is 12√2 cm.

Here,  Area of square = (sides)2                          = (12√2)2                         = 288 cm2 Also, .....

15. Please write the be verbs

The other forms of 'Be' are as .....

16. What is angle?

Angle: The space (usually measured in degrees) between two intersecting lines or surfaces at or close to the point where they .....

17. प्रत्यय भनेको के हो ? 

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18. X(-2, 2) , Y(2, 2) and Z(2, 8) are the vertices  of ∆XYZ. Translate ∆XYZ with  a translation vector  XY⃗ . Also translate the image so obtained by translation vector YZ⃗.

Here, the given points are, X (-2,2) , Y (2,2) and Z (2,8) Now, Translational vector XY = OY - OX = (2, 2) - (-2, 2) = (4, 0) Also, translational vector YZ = OZ - OY = (2, 8) - (2, 2) = (0, 6) Now, any point (x, y) under the translation vector .....

19. P(3 , 0) , Q(4 , 2) and R(2 , 4) are the vertices of ∆ PQR. Rotate the triange about origin through - 900 and rotate the image so obtained about the origin through +2700 . Represent  all trianges in the same graph.

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20. संयोजक 

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21. विस्मयादिबोधक 

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22. सकर्मक र अकर्मक कृयापद  

खान्छ, लेख्छ, पढ्छ आदि क्रिया सकर्मक हुन् भने जान्छ, हाँस्छ, रुन्छ क्रिया अकर्मक .....

23. समापिका र असमापिका कृयापद

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24. कृयामुल र कृयापद

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25. Find the value of sinθ , cosθ and tanθ when,  sin(θ/2) = 3/5

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26. अप्रेरणार्थक र प्रेरणार्थक कृयापद 

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27. Prove that: sec3α cosec3α - 3secα cosecα = tan3α + cot3α

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28. What do you mean by soil profile? Label with diagram.

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29. Explain any two processes of soil formation.

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30. Erosion and deposition take simultaneously. Clarify.

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31. Simplify: 25x+3 = 1/0.04

Here,     25x+3 = 1/0.04 or, 25x+3 = 251 or, x + 3 = 1    [ Base are equal, so exponents must be equal.] Find .....

32. Write any two measures to control soil erosion.

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33. Write any two effects of climate change.

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34. Climate around the sea and ocean remains the same throughout the year, why?

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35. कारण लेख 
वन जनग्ल र वन्यजन्तु घनिस्त सम्बन्ध छ ।

जनावरहरू सीधा वा अप्रत्यक्ष रूपमा पौधेहरूमा निर्भर गर्छन्। साकाहारी (जनावरहरू कि बिरुवा वा .....

36. Write any two causes that affect weather of a place. What is dark half?

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37. There is a difference in see breeze and land breeze, Why? Write the types of seasons.

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38. Winter crop yield is good in western part of Nepal, give reason.

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39. What do you mean by extreme climate?

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40. What are the types of climate in the world?

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41. In figure, AD//BC. If area of ∆ABE and ∆ACF are equal then prove that EF//AC.

Join, E &C. Then,  We have given,  ∆ABE = ∆ACF..............(i) ∆ABE = ∆AEC ..............(ii) From (i) & (ii)    ∆ACF =  ∆AEC So, EF//AC.   ( can you write .....

42. Simplify the following:

(125/27)- 1/ 3

Here, (125/27)- 1/ 3 = (53 / 33)-1/3 = (5/3)3 ⨉ -1/3  = (5/3)-1 = .....

43. Simplify the following:

∜625a4
 

Here, =  ∜625a4 = ∜54a4 = .....

44. Simplify the following:

∜81X8 Y12

Here,  ∜81X8 Y12 =  34 ×X4× X4×Y4×Y4×Y44 = 3 X×X × Y × Y × Y = 3 .....

45. Simplify the following:

(a-2b-c)(a+2b-c)

Here,    (a-2b-c)(a+2b-c) Arranging them we get, = (a - c -2b)(a - c + 2b) = [(a-c) - 2b] [(a - c) + 2b] = (a - c)2 - (2b)2     [ Since, ( a - b) (a + b) = a2 - b2.] = a2 - 2ac + c2 - .....

46. Simplify the following:
(2x+3y+1)(2x+3y-1)

Here,     (2x+3y+1)(2x+3y-1) This can be written as     [(2x+3y)+1] [(2x+3y)-1] = (2x+3y)2 - 12           [ Since, (a + b) (a - b) = a2 - b2.] = (2x)2 + 2.2x.3y + (3y)2 - 1  .....

47. What are the constituents of water

Water consists of Oxygen and Hydrogen (one atom of oxygen to two atoms of hydrogen for one molecule of .....

48. Electron volt is the unit of?

The electronvolt (symbol eV, also written electron-volt and electron volt) is a unit of energy which is equal to 1.6×10−19 joules (symbol J) in SI .....

49. Sir please provide me questions of sequence and series for practice up to 10 questions

2 .In a sequence if t8 = 24 and tn = 24 and 2tn+2 + 5n2 + n. Find the first three even terms of the .....

50. National system table.

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