Questions asked by Prashant S.

• Back to user's profile
• #2(sin^6A+cos^6A)-3(sin^4A+cos^4A)=-1#?
  
• Solute seperates as a solid when a saturated solution is cooled. Why ?
  
• Concentrated sulphuric acid should not be used while preparing hydrogen gas in laboratory. Why ?
  
• Temporary hardness of water can be removed by using calcium hydroxide. How ?
  
• Why are fossils are taken as the strongest evidence obtained so far regarding the evolution of organisms ? Give reason
  
• Which compound will form by the combination of oxygen and neon ? Also say the type of bond.
  
• How do you prove? ##Sec^4A-sec^2A = tan^4A+tan^2##
  
• How do you factorize? ##3tan^2A+2tanA-8##
  
• How do you prove? #Sin^3A+cos^3# = #(sinA+cosA) (1-SinA*cosA)#
  
• How to find the product of #(sinA-cosA)*(sin^2A+sinA*cosA+cos^2A)# ?
  
• The radius of a circle is 21cm. An arc of the circle subtends an angle of #60@# at centre. Find the length of the arc?
  
• If #6sinA + 8cosA# = 10 , how to prove that #TanA = 3/4# ?
  
• Find the coordinate of the point on x-axis which is at a distance of 5 units from the point #(2,-3)#?
  
• The midpoint of the line joining (a,2) and (3,6) is (2,b). Find the values of a and b?
  
• How to prove that : #1-cos^4A/sin^4A= 1 + 2cot^2A#?
  
• How to find the vertices of the image of #deltaPQR# having vertices #P(-1, 2), Q(-3, 5) & R(0, 4)# under the enlargement with scale factor -2 & centre at origin ?
  
• The vertices of a triangle ABC are # A(-6, 3) , B(-3,5) & C(4,-2)# . If the co-ordinate of P are #(x,y)# . How to prove that #PBC/ABC = x+y-2/5 # ?
  
• How to find the area of triangle whose vertices are #(3,-1),(2,7) and (-5,6)# ?
  
• Find the vertices of the image of triangle #PQR# having the vertices #P(-1,2) Q(-3,5) and R(0,4)# under the enlargement with scale factor #-2# and centre at origin?
  
• What are three conditions required by the sun to produce enormous energy?
  
• Which principle does hydraulic obey?
  
• Factorise : #a^4 + a^2 b^2 + b^4#?
  
• How to solve : # (px^2-4+5x)/(p^3x-x^2) = 1# ?
  
• Find the sub-duplicate ratio of 9:16 ?
  
• Solve : #(3y-8)/(5y-2) = (y-2)/(y+5)# ?
  
• How to Solve bu using elimination method ?
  
• How to prove ?
  
• What amount of heat is required to raise the temperature of #30 kg# water when it is heated from #20^@ C# to #37^@ C# ?
  
• Earthing is done only in the outer part of the electric appliances. What is the reason?
  
• If a transformer consist of #770# turns in primary coil with #220# primary voltage produces #110# secondary voltage, then calculate the number of turns in secondary coil?
  
• What mass of steam at #100^@ C# must be mixed with #150 g# of ice at its melting point, in a thermally insulated container to produce water of #50^@ C#?
  
• What happens to the force of attraction when: 1. Distance is doubled 2. Masses are doubled 3. Distance is reduced by half ?
  
• Give reason ?
  
• Find the value ? #sin105^@ + cos105^@#
  
• Find the value? #(Tan85^@ - Tan25^@)/(1+Tan85^@Tan25^@)#
  
• Prove that? # cot 15^@ = 2+ sqrt3#
  
• Find the value of? #tan15^@+cot15^@#
  
• If #tan theta = 5/6# and #tan phi= 1/11# then find #tan (theta + phi)# hence show that #(theta + phi) = (pie)/4# ?
  
• In the given figure of hydraulic press, if the cross section area of cylinder 'A' and 'B' are #0.5 m^2# and #10 m^2# respectively, what magnitude of effort is to be applied on cylinder 'A' to balance the load of #1000N# on cylinder 'B' ?
  
• Change into passive voice? #-># We must go into this matter.
  
• Differentiate between alkane, alkyne, alkene and alkyl ? Give at least 3 major differences of them.