Students and Teachers Forum

1. What is application software?

Application software is a complete, self-contained computer program that performs a specific useful task, other than system maintenance functions.  Application software, or simply applications, are often called productivity programs or .....

2. What is the disadvantage of echo?

The disadvantage of echo are:

1) It  causes disturbance while communicating, especially through mocrophones or telephones.

2) Multiple echos make words of a speaker unclear to the audience. So, echoes can ruin a .....

3. Solve: x2+ y3=2    x2+ 2y3=3.

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4. A coin is toced thrice, find the probability-ies by using the tree diagram.
a. Probability of all three H.
b. At least two times H.

X H T   HH HHH HHT   HT HTH HTT   TH THH THT   TT TTH TTT   Here,  n(S) = 8 So, Probability of getting all head=P(HHH) = .....

5. Solve: x2+ y3=2     x2+ 2y3=3.

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6. The cost price of a box and a pen is Rs. 80. The box is sold at 10% profit and the pen is sold at 10% loss. If the selling price of the box is Rs. 28 more than that of the pen, calculate the profit or loss percent in the whole.

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7. The whole seller purchased an electric item for Rs.2700 and sold to retailer at 10% percent. The retailer sold it to customer with profit of 20%. How much did the customer pay?

Here, cost price (CP) = Rs. 2700 Now, Price paid by retailer(SP1) = CP + 10% of CP = 2700 + 0.1×2700 = RS. 2970 And, price paid by customer (SP2) = SP1 + 20% of SP1 = 2970 + 0.2 × 2970 = Rs. .....

8. Find the volume of the given solid.

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9. Add:
456+211

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10. The price of an article with 13% VAT is Rs. 2,034. What is the price of same article without VAT? Find it.

Here,  SP with vat = Rs. 2034 or, SP + Vat% of SP = Rs. 2034 or, SP + 13% × SP = Rs. 2034 or, SP + 0.13SP = Rs. 2034 or, 1.13SP = Rs. 2034 Therefore, SP = Rs. 2034 / 1.13 =Rs. 1800 Hence, the pice of article without VAT is Rs. .....

11. Simplify:

48 + 64 - 54

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12. Write some idioms for comparisons.

Some of the idioms for comparison are: Idiom Meaning as blind as a bat some whose vision is poor or who is unable to see anything. as broad as it is long there is no real difference between which alternative is .....

13. Solve:
 1m+ 2m+2- 3m-2=0

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14. The difference between the semi-annual and annual compound interest on a sum of money is Rs. 482 at the rate of 20% per annum for 2 years, find the principal. (Ans: Rs. 20,000)

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15. In which quardant does point (-5,2) lie?

Here, x co-ordinate is negative and y co-ordinate is postive. Hence, the give point lies in 2nd .....

16. Construct a square having measure of a side 5.8 cm and justify it.

Construction of a square when a side is 5.8cm

 

 

construction square

Here, ABCD is a square where AB = 5.8 cm.

Step 1: Draw AB = 5.8 cm. 

Step 2: Construct angle 900 at both A and .....

17. Two number are x and x+2. If the sum of reciprocal is 5/12, find the number.

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18. The sum of present ages of son and father is 60. If both of them live until the son becomes as long as the father is now, the sum of their age becomes 120. Find their present age.

Assume the age father and son be x and y. So, x + y = 60 ......(i) Time for son to be father's age, ( x - y) So, Father's age will be: 2x - y Son's age = x. So, 2x - y + x = 120 or, 3x - y = 120 ......(ii) Adding equation (i) .....

19. Is the process below right or wrong? Do explain.

Your second step is wrong, but 3rd is correct. There must be  x2 - 2.x.48+ 482 = 196x or, x2 - 96x+ 2304 = 196x or, x2 - 96x - 196x+ 2304 = 0 or, x2 - 292x+ 2304 = 0 Compare this with, ax2 + .....

20. If the efficiency of the given simple machine is 75% in given figure, calculate total effort required to lift the load.

[47.5N]

Solution: Here,  Load (L) = 1500 N Load distance (L.d.) = 80 cm  Effort distance (E.d.) = 110cm  Efficiency (η) = 75% Effort (E) = ? We have, MA = L/E        = 1500 / E VR = E.d./L.d.     .....

21. In the given figure △ ABE  and  △DCE are similar. Find the value of x.

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22. Find the dimension of unknown side of the given triangles.

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23. If x = a13- a-13 then prove that: x3+ 3x = a - 1a

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24. Prove by vector method that diagonals of a rectangle are equal.

In the figure, ABCD is a rectangle and AC and BD are diagonals. You may know, AC vector = AB vector + BC vector Squaring both sides , you will get, AC2 = (AB vector)2 + 2 x AB vector . BC vector + (BC vector)2 [ Product of two .....

25. After allowing 25% discount on the marked price of a circle, 15% VAT was levied on it. If cycle was sold for RS. 3450, Calculate the marked price of the cycle.

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26. The blood of a person living in mountain contain more blood cells than than the blood of a person living in the terai,why?

An elevation of land or air above 1200 mts is considered as high altitude.  As the altitude increases, the atmospheric pressure decreases. Thus reducing the level of oxygen.   People living at higher altitudes are used to the lower .....

27. Who scored the first goal in FIFA world cup 2014???

Marcelo from brazil ( own goal .....

28. Write a letter to a friend about social problem of Nepal.

Thapathali, Kathmandu 23rd March 2018 Dear Erica,

Thank you so much for making a concern about the social problems in Nepal. You might have heard that Nepal is in the list of least developed nations in the world. .....

29. What is rust? What are the necessary condition for rusting? How does rusting occur?

Thus, rust is powdery substance formed by oxidation of iron in the presence of moisture. From this, you can say that the necessary condition for rusting is presence of .....

30. Find the average data of 18, 11,14,10,17.

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31. Some hot water was added to three times the mass of the cold water at 10°c and the resultant temperature was found to be 20°c . What was the temperature of hot water?

Here,  Mass of the cold water (m1) = a (suppose) Then,  Mass of the hot water (m2) = 3a  Temperature of the cold water (t1) = 10oC Resultant temperature of the water (t) = 20oC Specific heat capacity of water (S) = 4200 .....

32. Hydrogen is easily displaced by the metal from the acid. Give 2 reasons

Metals have a tendency to lose electrons. These electrons, which are readily lost by reactive metals like sodium, potassium etc are accepted by hydrogen ions of the acids, reducing them to hydrogen gas (H2). 2 H+ + 2e- → H2 However, .....

33. Two equal chords AB and CD of a circle with center O intersect at P. Prove that AP=DP and BP=CP.

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34. How many constilation are there in universe?
 

There are 88 official constellations. But astronomers haven't made up new constellations for hundreds of years. When new stars are discovered, they are considered to be a part of whatever constellation they are closest .....

35. What changes occur in atoms when they undergo chemical reaction to form a compound?

In a chemical reaction, the atoms and molecules that interact with each other are called reactants. No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact .....

36. If 8 sin θ = 4 + cos θ, find the value of tan θ.
Ans: 3/4 or 5/12

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37. Simplify:
8 - 3-2+6 + 2 3+2+ 6

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38. The sum of simple interest and compound interest of a certain sum of money for 2 years at the rate of 7% per annum is Rs 85470. By how much percent the compound interest is more than the simple interest?

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39. A stone is dropped in a well. if the stone takes 3s to reach the water surface. calculate
a) the depth of water surface in the well
b) the velocity with which the stone strikes the water.

By the question, Time(t) = 3 sec BY using the formula. h = 1/2gt2 or h = 1/2 ⨉ 10 ⨉ 32 ∴ h = 45 m Again,  v = u + at2 or v = 0+ 10 ⨉ 32 ∴ V = 90 .....

40. Find product: f(x) = x2 - x - 6  and  g(x) = x + 4

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41. In survey of a community, it was found that 125 people liked to read Gorkhapatra, 150 people liked to read Kantipur, 97 people liked to read both newspapers and 10 didn't like to read any of them. Then, 
a. illustrate the above information in venn diagram.
b. find the number of people in the survey.

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42. Simplify:
 13-2+32+1-223-1

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43.  An electrical appliance is marked 220V, 550W. What is the resistance when in use?

 

By the quesition. Voltage(V) = 220V Power (P) = 550W Resistance(R) = ? By using formula. P = VI or, I = P/V or, I = 550/220 ∴ I = 2.5 A Again, V= IR or, R = V/I or, R = 220/ 2.5  ∴ R = .....

44. Name of some historical personalities.

Those who have contributed a lot for the betterment of our country and its people are called historical personalities. Historical personalities have sacrificed their lives for national development. They didn't surrender to anybody else .....

45. The angle of depression of the bottom of a pole  of height 20m when observed from the top of a tower is found  to be 600 and the angle of depression of the bottom of the  tower from the top of the pole is 220. find the height of tower and the distance between the pole and the tower. (tan 220 = 6.4)

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46. In the figure, ABC is a straight line. Prove that EFDG is a cyclic quadrilateral.

Here, 1. ∡ABG = ∡GEF             [ int.angle is equal to opposite ext.angle of a cyclic qd.] 2. ∡CBG = ∡GDF               [ int.angle is equal to .....

47.
In the given figure PQ = PR and QM = NR, prove that ∆PMQ ≅ ∆PNR.

Please repost the question with correct .....

48.  Calculate the resistance of a bulb rated 60W, 240V.
 

By the question, Voltage (V) = 240 V Power (P) = 60 W Resistance(R) = ? By the formula, P = V⨉ I  or, I = P/V or, I = 60/240  ∴ I = 0.25 A Again, V = I ⨉ R or R = V/I or, R = 240/0.25 ∴ R = .....

49. The marked price of a television is  Rs. 10000. If the VAT amount is 90% of discount amount and the price with VAT is Rs. 9900, find the discount amount.

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50. A shopkeeper fixes the selling price of his computer to make a profit of 30%. If he reduces his selling price by 10%, what profit will he make?

Let CP = y,  Then,  MP = CP + 30% of CP       = y + 30/100 x y       = 13y/10 SP = MP - 10% of MP      = 13y/10 - 10/100 x 13y/10       =117y/100 Now,  Profit = SP - .....