Students and Teacher's Forum

Students and Teachers Forum

बिरालोले मुसा समातोस् .....

2. पासाङल्यामुले सगरमाथा चढ्नु हुन्छ ।( सामान्य भूत )

पासाङल्यामु सगरमाथा चढ्नु भयो .....

3. Divide Rs 1,95,150 between A and B so that the amount that A receives in 2 years is the same as that B receives in 4 years when interest is compound annually at the rate of 4% p.a for both.

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4. What is the capital city of Argentina?

Buenos Aires is the capital of .....

5. tan230o + sec260osec260o - tan230o = 1311

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6. Find the value of x: x-x3=12

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7. How much effort is needed to lift a load of 200 N placed at a distance of 20 cm from fulcrum if effort applied at a distance 60 cm from the fulcrum on opposite side of the load? Calculate MA and VR of the lever.

Solution: Given, Load (L) = 200N Load distance (L.d) = 20 cm .....

8. Ashok and Krishna are sitting on opposite ends of a sea-saw. The weight of Ashok is 40 kg and that of Krishna is 80 kg. If Ashok is sitting 2 m away from the fulcrum, how far Krishna must sit from the fulcrum to balance the lever?

We have, from the principle of simple machine, Input work = Output work or, E ⨉ E.d. = L ⨉ L.d. or, 392 ⨉ 2 = 784 ⨉ L.d. or, L.d. = 784/784 ∴ L.d. = 1 m Hence, Krishna must sit 1 m far from the .....

9. A 500 kg load is to be lifted up using a first class lever. Different distances and their corresponding effort are shown in the table below. How far is the load from the fulcrum? Also find the value of A, B, C and D.

Effort distance	10 cm	A 40 cm	C 100 cm
Effort	1000 N	500 N B	200 N D

The table required to find the values of A, B, C and D is not correct. The value of one component should be known to find the value of unknown component. Since there are unknown components in a colume, they (A, B, C and D) cannot be .....

10. Differentiate between effort distance and load distance.

Differences between effort distance and load distance are as follows: Effort distance Load distance The distance of the effort from the fulcrum is called the effort distance. The distance of the load from the .....

11. Differentiate between ideal machine and real machine.

Differences between ideal machine and real machine are as follows: Ideal machine Real machine 1. An ideal machine is one which is 100% efficient. 1. A real machine is one which is not 100% .....

12. Differentiate between MA and VR.

Whenever you applied effort, some part of the load goes upward and you will go down. Thus, the ratio of distance travel by an effort to the distance travel by load is called V.R. M.A is affected by friction but V.R. is not affected by .....

13. Differentiate between input work and output work.

The efficiency of a simple machine is the ratio of output work and input work expressed in percentage. The work done on the machine by us is input work. Output work is the work done by the machine. Input work is the product of effort and effort .....

14.

The mean of the data given below is 47. Find the missing frequencies if their sum is 9.

x	20	30	40	50	60	70
f	2	-	6	10	-	3

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15. It is hot in terai than hilly region of Nepal. Why?

Terai of Nepal lies in lower altitude. So, it recieves direct sunrays. But, hilly region lies in higher altitude. Hence, it is hot interai than hilly region of .....

16. What is meant by "accrual basis"?

Accrual basis is a method of recording accounting transactions for revenue when earned and expenses when incurred. The accrual basis requires the use of allowances for sales returns, bad debts and inventory obsolescence, which are in advance of .....

17. Find the area of shaded region.

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18. What must be the value of x to make 2÷x+3 undfefined.

Any number is undefined when it is divided by 0. Here, 2 must be divided by 0 to be undefined. i.e. x+3 must be 0. So, x+3=0 or, x = -3 The value of x must be -3 for the given expression to be .....

19. Calculate the part of ice above the surface of water if the dimension of ice is 20 cm × 15 cm × 10 cm. Density of ice = 0.9 g/cm³.

Here, Volume of ice(V) = 20 ⨯ 15 ⨯ 10 = 3000 cm3 Density of ice(Di) = 0.9 g/cm3 Density of Water(Dw) = 1 g/cm3 Now, Mass of ice = Di x Vi = 3000 x 0.9 = 2700 g Hence, Mass of ice(Mi) = 2700 .....

20. Find the coordinates of the points of trisection of the line joining P (1,-3) and Q (4,3)

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21. Write an essay on, " Growing use of mobile phone and its impact on student" in about 180 words.

With advancement in science and technology, different inventions have taken place. These inventions have impacted the people's life in great way. These days even a child of 8 years know how to draw the pattern .....

22. क्रिया भनेको के हो ?

कुनै काम गर्नु वा कुनै घटना घट्नु भन्ने बुझाएर वाक्य पुरा गर्ने पदलाई क्रियापद भनिन्छ । .....

23. What is meant by royalty?

A royalty is a payment to an owner for the use of the property. A royalty payment is made to the legal owner of the property, patent, copyrighted work. It is made by those who wish to make use of it for the purposes of generating revenue or other .....

24. Solve: (0o≤θ≤360o) 4cos2A - 2sinA = 1 [Ans: 30^o ,150^o]

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25. How does insurance help to reduce inflation?

Inflation protection is considered a desirable feature of a policy by policyholders. Inflation protection is an additional feature that can be added to the policy. It means that it is an additional cost that can increase the premium .....

26. How does insurance help to eliminate dependency?

The insurance is an agreement between the parties. In such agreement, one party pays a certain amount of money to the other in case of any damages or loss for certain amount of premium. Due to death or destruction of properties, the family suffers .....

27. Prove that:
2⁡sinA⁡cos 3A+ 2⁡sin 3A⁡cos 9A+2⁡sin 9Acos 27A =⁡tan 27A- tan A

Here, We have to prove, 2 sin A / cos 3A + 2 sin 3A / cos 9A + 2 sin 9A / cos 27A = tan 27A - tan A Taking, 2 sin A / cos 3A Multiply with cos A to Numerator and denominator = 2 sin A cos A / cos 3A cos A Formula (sin 2A = 2 sin A .....

28. Calculate MA, VR, input work, output work and efficiency after observing the given diagram.

Effort distance = 8m Load distance = 2m V.R. = Effort distance/ Load distance = 8/2 V.R. = .....

29. What is your name?

My parents and friends call me Amar. My family name is Tuladhar. Amar Tuladhar is my name. What is your .....

30. Prove that:
cos⁶θ - sin⁶θ = cos2θ1-14sin²2θ

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31. In the figure, D is midpointof AB. if 3DE = BC = 24cm, Find the area of ∆ABC.

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32. एउटा कोठाको लम्बाइ यसको चौडाइ भन्दा 4 cm लामो छ । यदी चौडाइ 8 m भए सो कोठाको भुईमा 0.02 वर्ग मिटरको इट्टा बिछ्याउन चहिने इट्टाको सङ्ख्या पत्ता लगाउ ।

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33. In the given figure, O is the centre of circle where XO//SQ, prove that PX = XS.

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34. In the given figure given below, PQ is a diameter of circle with a centre at O.
If PX=XS, prove that OX//QS.

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35. Define gravity and gravitational force.

The gravitational force is a force that attracts any two objects with mass. We call the gravitational force attractive because it always tries to pull masses together, it never pushes them apart. Every object, including you, is pulling on .....

36. Find the image of A(3, 4), B(7, -6), C(-5, -7) and D(-7, 4) after rotation through 90⁰ in anticlockwise direction. about the centre at origin with graph.

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37. Prove that the following points are the vertices of parallelogram. (Using distance formula)
(3, 3) (1, 2) (-5, 2) and (-3, 3).

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38. Prove that the following points are the vertices of parallelograms(using mid point formula) a(-1,0) b(3,1) c(2, 2) and d( -2, 1 ).

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39. sinπ6 +⁡cosπ6⁡sinπ6 -⁡cosπ3

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40. cos A. cosecA . √(sec²-1) = 1

Here, L.H.S = cos A. cosecA . √(sec2-1) = cos A. 1/sin A . tan A = cos A/sin A . sin A/cos A = .....

41. The amount of water in a saturated solution made of 30°c is 50 gm. If the solubility of the salt used there is 20 find the amount of salt.

Solution: Given, At 30oC, Solubility of salt = 20 Weight of solute (W1) = ? Weight of solvent (W2) = 50 gm We know, Solubility = Weight of solute / Weight of solvent ⨉ 100 or, 20 = W1 / 50 ⨉ 100 or, W1 = .....

42. Find the principal which will amount to Rs.2000 in 6 years 8 months at the rate of interest 5% per annum.

Soluttion, Given, A= Rs. 2000 .....

43. prove that (sinA-cosA+1)÷(SinA+cosA-1)=secA + tanA

Starting from LHS, = 1 / cosA + sinA/cosA .....

44. Translate the p(9,-8) by translation vector (5/3)

Here, We know, P( x ,y) --------------Translation ,T( a , b) ------------> P'( x + a , y + b) so, P( 9 ,-8) --------------Translation ,T( 5 , 3) ------------> P'(9 + 5 , -8 + 3) .....

45. Mitochondria is the powerhouse of the cell. Why?

The mitochondria is called the powerhouse of the cell because it is responsible for producing most of the cell's energy. Mitochondria are able to multiply in response to the energy needs of a cell, so that cells requiring more energy to .....

46. Convert 2MW into W.

Watt (W) is the unit of power. One megawatt (MW) is equal to 1000000 watts (W). i.e. 1 MW = 1000000 W So, 2 MW = 1000000 ⨯ 2 W = 2000000 W. Hence, 2 MW is equal to 2000000 .....

47. A like lost 5% by selling an article for Rs 30.20. If he sold it for Rs 50.20, find his gain or loss percent.

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48. Solve by matrix method:
2x+4/5=40-3x/4=y

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49. Fish is an aquatic animal. Why?

Fish lives in water for all its life time. Also it breathes through gills and it has an ability to extract dissolved oxygen from water. Hence, fish is an aquatic .....

50. नेपाली संस्कृतिका बारे बर्णन गर।

नेपाली संस्कृतिका थुप्रै विशेषता रहेका छन् । नेपालमा विविध भेगबाट आएका विविध जातिहरुको .....