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has anyone got the ans keys of vidya dhristi test series???? do help ...

Question. A block having equilateral triangular cross-section of side a and mass m is placed on a rough inclined surface,so tat it remains in equilibrium . The torque of normal force acting on the block about its center of ma ...

Question. The number of monochloro derivative of isobutane is ???? answer given is 4................but mine 2 came............Can someone explain?? ...

2)if a four digit number is chosen at a random.....wht is the probab that it contains not more than 2 different digits....... 3)fnd the area of triangle whose vertices are the incenter ,centroid,and the circumcenter of a tria ...

A frictionless tube lies in the vertical plane and is in the shape of a function that has its endpoints at the same height but is otherwise arbitrary. A chain with uniform mass per unit length lies in the tube from end to end ...

hello guys i am a student of class 11 and able to get my concepts clear but when it comes to solving problems i cant do . my concepts are quite a lot clear but not able to solve problems help me guys ...

Judging by the popularity of congruences , let's try to do things in a different way , but I don't have a problem in congruences :) especially it would be a treat to watch other solutions too ---- 1 > Find the last 3 digit ...

*Image* Question. Two blocks of masses 10 kg & 2 kg are connected by an ideal string passing over a fixed smooth pulley as shown in above figure. A monkey of mass 8kg started climbing the string with a const. acceleration 2m/ ...

A non conducting sheet of larg surface area and thickness d contains uniform distributoin of density ∂. find E at a pt. P inside the plate, at a dist. x from the cetral plane. ...

Q. If a+ b+ c=0, where a≠b≠c, then a2/2a2+bc + b2/2b2+ac + c2/2c2+ab is equal to (A) 0 , (B) 1, (C) -1 , (D) abc ...

Probability of a bomb hitting a bridge is 1/4. If two direct hits are neede to destroy it, find the least no. of bombs required so tht the probability of the bridge being destroyed is greater than 0.9. Am stuck here - (4/3)n ...

1) 5% of all bulbs made by a manufacturing company are defective. A lot contains 100 bulbs. Find probability tht 6 are defective. Won't the ans be this simply- 100C6(1/20)6(19/20)94 ? Ans given : 100C6(1/20)100 2) 60 dice are ...

http://www.isical.ac.in/~deanweb/isient_announcement.html ...

*Image* Question. A sitting cat in a field suddenly saw a dangerous bull dog at a distance l from her. To save her precious life, the cat runs away in a straight line with const. velocity u. Without any time lag the dog start ...

*Image* Q.In an equilateral triangle, 3 coins of radii 1 unit each are kept so that they touch each other and also the sides of the triangle. Area of the triangle is???? ...

*Image* Question. A small spherical ball is released from a point at a height h on a rough tck as shown in the figure. Assume that it does not slips anywhere , find its linear speed when it rolls on the horizontal part of the ...

i have obc certificate if i apply for reservation is it compusory that v should consider only obc ranking for admission......??????? or even if v apply will i be having option to go in ge category (during admission )depending ...

achaa agar genius ho toh batao.. sabse upar kaun sa dice hai... *Image* ...

1) Ina plane there are two families of lines Y = x + r, Y = -x + r , where r belongs to {0,1,2,3,4}. The number of squares of diagonols of length 2 formed by the lines is :- (a) 9 (b) 16 (c) 25 (d) None of these ...

N people are there in a group. It is known that the probability that atleast two of them having common birthday is "P". find the smallest N such that P is greater than 1/2 (This is an easy problem. Do not get intimida ...

Draw the graph of y = [sin [x]] ...

*Image* This is an infinite grid... Find the resistance between two consecutive nodes... PS: This is a very old question which has appeared in a lot of places including IE Irodov..(If I remember correctly) This problem uses a ...

What is the value of \sum_{n=1}^{100}{} K+nCn-1 Where K is a positive integer. ...

Find the focus of the parabola : x2+y2+2xy-6x-2y+3 = 0 Ans : (1,1) ...

\lim_{n\rightarrow \infty }\prod_{r=2}^{r=n}{\frac{r^{3}-1}{r^{3}+1}} ...

Question. Let n b a +ve integer such that sin π/2n +cos π/2n = √n/2 . then (a) 6≤n≤8 (b) 4≤n≤8 (c) 4<n≤8 (d) 4<n<8 Please show ur steps........am doubtful about a step. ...

Find the remainder on division of the following expressions.... 1) 502008 by 7 2) 2008 by 7 3) 20082008 by 13 4) (1!+2!+3!+..........2008!) by 2008 5) Last 3 digits of (1!+2!+3!+..........2008!) 6) (1!+2!+3!+..........2008!) ...

Find the range of values of λ for which the variable line 3x+4y - λ=0 lies between the circles: x2+y2 - 2x - 2y +1=0 x2+y2 - 18x - 2y +78 = 0 without intercepting a chord on either circle. ...

What shud be the major products "A" & "B" in the foll. simple cases....? *Image* (P.S. I know, too simple, ...yet, awaiting replies to clear the confusion once n fr all [1]) ...

A gas bubble from an explosion under water oscillates with a period T proportional to PadbEc ,where P is the static pressure,d is the density of water and E is the total energy of the explosion.Find values of a,b and c. ...