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There are 10 prizes, five As, there Bs and two Cs, placed in identical sealed envelopes for the top 10 contestants in a mathematics contest. The prizes are awarded by allowing winners to select an envelope at random from those remaining. Then the 8th contestant goes to select the prize, the probability that the remaining three prizes are once Aa n dB and one C is 1//4 b. 1//3 c. 1//12 d. 1//10

Direction: Study the given information carefully and answer the following questions. Ten Boxes A, B, C, D, E, F, G, H, I and J are placed one above the other in any particular order. Box number 1 is at the top and Box number 10 is at the bottom. There are three boxes between Box A and Box B. Box I is placed on an even numbered position. Box J is immediately above F and immediately below C. Box G is placed between the Box D and Box H. There are three boxes between Box D and Box I. Box B is neither at the top nor at the bottom. Box F is at ninth position. Box G is immediately above Box H. Three among the four are alike in certain way. Find the one that does not belong to that group.

A flag staff of height 10 metres is placed on the top of a tower of height 30 metres.At the top of a tower of height 40 metres,the flag staff and the tower subtend equal angles then the distance between the two towers in metres is

A charge of 1.0 C is placed at the top of your college building and another equal charge at the top of your house. Take the separaton between the two charges to be 2.0 km. Find the force exerted by the charges on each other. How many time of your weight is this force?

Angle of elevation is the angle which line of sight makes with the horizontal. Angle of elevation of the top of a tall building is 30^(@) from a place A and becomes 60^(@) from another place B that is 10sqrt()3 m from A towards the building as shown in the figure. Height of the building is close to

A short bar magnet of magnetic moment 1.5 Am^2 is placed along x-axis at origin. If the magnetic field along line joining origin to point [P(2 sqrt3,2,0)] m is [{sqrt(n) *10^-7} /128 (T)] , Then n should be

A short bar magnet is placed in magnetic meridian with its north pole pointing toward south: Its magnetic moment is 2Am^(2) . Neutral point is obtained 10cm from centre of magnet toward north. Calculate horizontal component of earth's magnetic field.