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Easy
Question
A bag contains a large number of white and black marbles in equal proportions. Two samples of 5 marbles are selected (with replacement) at random. The probability that the first sample contains exactly 1 black marble, and the second sample contains exactly 3 black marbles, is
The correct answer is:
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If A and B are two events such that, 
is equal to
If A and B are two events such that, is equal to
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Events A and C are independent. If the probabilities relating A, B and C are P (A) = 1/5; 
then
Events A and C are independent. If the probabilities relating A, B and C are P (A) = 1/5; then
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The number of ways in which we can choose 6 chocolates out of 8 different brands available in the market is
The number of ways in which we can choose 6 chocolates out of 8 different brands available in the market is
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If three one by one squares are selected at random from the chessboard, then probability that they form the letter 'L' is
If three one by one squares are selected at random from the chessboard, then probability that they form the letter 'L' is
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When a body is thrown with a velocity u making an angle q with the horizontal plane, the maximum distance covered by it in horizontal direction is :
When a body is thrown with a velocity u making an angle q with the horizontal plane, the maximum distance covered by it in horizontal direction is :
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The probability of selecting two small squares on a chess board having a contact at corner is
The probability of selecting two small squares on a chess board having a contact at corner is
Maths-General
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A bag contains some white and some black balls, all cominatitions of balls being equally likely. The total number of balls in the bag is 10. If three balls are drawn at random without replacement and all of them are found to be black, the probability that the bag contains 1 white and 9 black balls is
A bag contains some white and some black balls, all cominatitions of balls being equally likely. The total number of balls in the bag is 10. If three balls are drawn at random without replacement and all of them are found to be black, the probability that the bag contains 1 white and 9 black balls is
Maths-General
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Two real numbers x,y are chosen from the interval [0, 8] then the probability that 
is
Two real numbers x,y are chosen from the interval [0, 8] then the probability that is
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The locus of the centre of a circle which cuts orthogonally the parabola 
will pass through point
The locus of the centre of a circle which cuts orthogonally the parabola will pass through point
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Consider the parabola 
Let P=(a,b) be any fixed point inside the parabola and let S be the focus of the parabola. Then the minimum value of SQ + PQ as point Q moves on the parabola is
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Maths-General
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An athlete completes one round of a circular track of radius 10 m in 40 sec. The distance covered by him in 2 min 20 sec is :
An athlete completes one round of a circular track of radius 10 m in 40 sec. The distance covered by him in 2 min 20 sec is :
Physics-General
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Assertion: The binding energy of a satellite does not depend upon the mass of the satellite.
Reason : Binding energy is the negative value of total energy of satellite.
Assertion: The binding energy of a satellite does not depend upon the mass of the satellite.
Reason : Binding energy is the negative value of total energy of satellite.
Physics-General
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Assertion: There is no effect of rotation of earth on acceleration due to gravity at poles.
Reason : Rotation of earth is about polar axis.
Assertion: There is no effect of rotation of earth on acceleration due to gravity at poles.
Reason : Rotation of earth is about polar axis.
Physics-General
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What does not change in the field of central force
What does not change in the field of central force
Physics-General
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The earth E moves in an elliptical orbit with the sun S at one of the foci as shown in figure. Its speed of motion will be maximum at the point-
The earth E moves in an elliptical orbit with the sun S at one of the foci as shown in figure. Its speed of motion will be maximum at the point-
physics-General
