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1) When an object is at a distance x1 and x2 from the poles of a concave mirror , imagesm of same magnification are formed. The magnitude of the focal length of the mirror is : a) \left|\frac{x_{1}+x_{2}}{2} \right| b) \left| ...
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A Long pliablle carpet is laid on ground. One end of the carpet is bent back and pulled backwards with a constant velocity of 16 m/s. If mass/length of the carpet is 1 Kg/m , the minimum force required to pull the carpet is : ...
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1)The triangle formed by the tangent to the curve f(x) = x2 + bx - b at the point (1,1) and the co-ordinate axes lie in the first quadrant. If it's area is 2 then the value of b is: a)-1 b)3 c)-3 d)1 ans c 2)If the normals fr ...
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1)The triangle formed by the tangent to the curve f(x) = x2 + bx - b at the point (1,1) and the co-ordinate axes lie in the first quadrant. If it's area is 2 then the value of b is: a)-1 b)3 c)-3 d)1 ans c 2)If the normals fr ...
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What is \huge \lim_{n \rightarrow \propto }\frac{x^{n}}{n!} ????? ans : 0 (Right now I am studying in a state engg colg. in 1st yr. I came across this qsn once in success magnet of Aakash Inst. and another time while the teac ...
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*Image* ans: a) uoI/4r ( 2r2 - a2/4r2 - a2 ) to the left. b) uoI/(pi)r ( 2r2 + a2/4r2 + a2 ) towards the top of the page. ...
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1) If f( x+y/2 ) = f(x) + f(y)/2 for x,y belongs to R anf f'(0) exists and equal to -1 and f(0) = 1 then the value of f(2) is 1) 0 2) 1 3)-1 4) 2 answer 3 ---------------------------------------------------------------------- ...
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Two men A and B of masses M and M+m respectively start simultaneously from the ground and climb with uniform acceleration up the free ends of massless inextensible rope which passes over a smooth pulley at a height h from the ...
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*Image* answer c ...
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P.S. I don't have the answers. In these qsn i am having a doubt..please help... 1)How long ____________________?? a) you are waiting b)are you waiting c)you have been waiting d)have you been waiting my doubt B and D...why/why ...
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P.S. I don't have the answers. In these qsn i am having a doubt..please help... 1)How long ____________________?? a) you are waiting b)are you waiting c)you have been waiting d)have you been waiting my doubt B and D...why/why ...
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guys post all your number sequence problems in this thread... with Manmay's idea To start off... for practice P.S. the hidden part contains the answers... I) For the following find the ODD MAN OUT 1) 10,14,16,18,21,24,26 a)26 ...
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If one face of a bi-convex lense with focal length f is silvered , what will be the new focal length ? Also what if the lense was a plano convex lense?? the second part of the qsn was asked in wbjee..which i could not answer. ...
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1) *Image* ------------------------------------------------------------------------------------------ 2)just a doubt.... *Image* *Image* my doubt is shud'nt it be 4 common tangents ??? ...
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*Image* *Image* *Image* *Image* plz post your solutions also... ...
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1) A force F=-K((x i + y j) acts on a particle moving in the x-y plane.(K is a positive constant).Starting from origin if the particle is taken to (a,0) along x-axis and from there to (a,a) parallel to y-axis,the work done y ...
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0∫1 1-x /1+x dx a)1 b) (pi)/2 + 1 c) (pi) d) (pi)/2 - 1 the ans is d ...
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1) Show that for a positive integer n , the co-efficient of xk (0 ≤ k ≤ n) in the expansion of : 1 + (1+x) + (1+x)2 +......+ (1+x)n is n+1Cn-k . ---------------------------------------------------------------------------- ...
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\sum_{s=0}^{n}{(1)} = ( n + 1 ) how is it coming.... or shud we just remember it [12][12][12][12][12][12][12][12][12] ...
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\sum_{s=0}^{n}{(1)} = ( n + 1 ) how is it coming.... or shud we just remember it [12][12][12][12][12][12][12][12][12] ...
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A uniform rod of density ∂ is placed in a wide tank containing a liquid of density ∂o(∂o>∂). The depth of liquid in the tank is half the length of the rod. The rod is in equilibrium , with its lower end resting on ...
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A long metal rod of length l and relative density ∂ is held vertically with its lower end just touching the surface of water.The speed of the rod when it just sinks in water is given by a)√(2 g l) b)√(2 g l ∂) c)√(2 ...
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A piece of ice with a stione frozen inside it is floating in water contained in a beaker. When the ice melts the level of water in a beaker a)rises b)falls c)remains unchanged d)falls at first then to the same height as befor ...
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A spherical small ball of density p is gently released in a liquid of density ∂ (p > ∂ ) . The initial acceleration of the free fall of the ball will be : a) p + ∂/p g b) p - ∂/∂ g c) p - ∂/p g d)g the answer g ...
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A small drop of water of surface tension ∂ is squeezed between two clean glass plates so that a thin layer of thickness d and area a is formed between them. If the angle of contact is zero , the force required to pull the p ...
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A cube of ice is floating in a liquid of relative density 1.25 contained in a beaker. When the ice melts , the level of the liquid in the beaker A)rises b)falls c) remains unchanged d)falls at first and then rises to the same ...
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editedIn a rectangular room (a cuboid) with dimensions 30x12x12 , a spider is located in the middle of one 12x12 wall one foot away from the ceiling. A fly is in the middle of the opposite wall one foot away from the floor. I ...
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*Image* i've marked d... ...
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*Image* *Image* where am i making the mistake???? the second solution is given in the book!! where am i wrong in my solution(1st one).....?? ...
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*Image* how to apply Wheatsone's bridge and thermal resistence here?? please explain... ...
