Questions asked by haarika

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• If sec x =2then find sin x, cos x ,tan x, cosec x, sec x,cot x, cot x+cosec x ?
  
• Can we write sqrt9*4 as 3*2? justify?
  
• Can we write #sqrt(9+4)# as #sqrt9 + sqrt4#? Justify?
  
• Can we write #sqrt25+sqrt16# as #sqrt41# ? Justify?
  
• Can we write 9+x as 9x? justify?
  
• Explain thales theorem?
  
• Angle b=angle f = angle d=90 ab=x, cd=z, ef=y then prove tht 1/x+1/y=1/z?
  
• In a school there are 8 teachers including the headmaster.In how many ways can a committee of 5 teacher can be formed without the headmaster ?
  
• 5 terms are in A.P.Sum of middle 3 terms is 24.Product of the first and the 5th is 48.find the terms.?
  
• The sum of 3rd and 5th term of an ap is 16 and their product is 60.find the terms of the ap?
  
• He studies well. The question tag of the above is (a) does he? (b) doesn't he? (c) don't he? (d) is it he?
  
• They are drowned ……………………… their own thoughts. The correct preposition is ?
  
• We saw ……………………… holy man on the hill. The suitable article is?
  
• The teacher is giving instructions to the students. The Passive voice of this sentence is ?
  
• Change into reported speech : Lucy said to the author, “Is that all about civilization ?”
  
• Change into passive voice : Who did this ?
  
• The 4th and 8th term of an ap is in ratio 1:2.the tenth term is 30.find the common difference?
  
• In 3 consecutive positive integers, the square of the 1st integer is equal to the sum of, 7 times the second integer, and the 3rd integer. How to find all 3 integers?
  
• Tunga takes 3 more days than the number of days taken by Gangadevi to complete a piece of work.if both tunga and Gangadevi together can complete the same work in 2 days,in how many days tunga alone can complete the work?
  
• The 8th term of an ap is 5 times the 4th term.the sum of first 20 terms is 450.find the sun of first 25 term?
  
• The sum of first 8 term of an AP is 100 and sum of first 19 terms is 551. Find the AP..?
  
• In a gp tn-2:tn-5=1:8 then the common ratio is?
  
• The uv rays in stratosphere break the cfc into chlorine atoms.chlorine reacts with ozone and breaks into oxygen.as oxygen is helpful to man.why it is harmful?
  
• What is phytoplankton ?
  
• Can u please explain red giant,white dwarf,quasars and black hole?
  
• Can u derive the formula for orbital velocity with proper explanation?
  
• Can u derive the formula for escape velocity with proper explanation?
  
• A cyclist riding a cycle fitted with a dynamo to a tyre gets bright light in the bulb connected, when he pedals fast. This is because?
  
• #tan(60+x)/tan(60-x)color(white)("d")# use the formula #cosA cosB-sinA sinB# ?
  
• Find #(d^2y)/dx^2# if #y=e^sqrt(sin(x))#?
  
• If the ratio if n th terms of 2 a.p's is( 2n+8):(5n-3),then the ratio of the sums of their new terms is,?
  
• The acceleration between time t and distance x is t=ax^2+bx where a and b areconstants.the acceleration is?