Recent questions tagged jeemain

If $n$ is odd, then in how many ways $3$ numbers that are in A.P. can be selected from the numbers $1,2,3,...............n$?

asked Sep 3, 2013 by rvidyagovindarajan_1

1 answer

Refer to the below equation :

asked Sep 3, 2013 by sreemathi.v

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The position vector of a point $P$ is given by $\overrightarrow r=x\hat i+y\hat j+z\hat k$, where $x,y,z\in N$. Position vector of point A is given by $\overrightarrow a=\hat i+\hat j+\hat k$. How many points P are possible so that $\overrightarrow r.\overrightarrow a=5$ ?

asked Sep 3, 2013 by rvidyagovindarajan_1

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In how many ways 9 identical marbles can be placed in 3 identical boxes?

asked Sep 3, 2013 by rvidyagovindarajan_1

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How many 7 digit numbers are there using the digits,1,2,3 and '2' should occur 2 times in each of the number?

asked Sep 3, 2013 by rvidyagovindarajan_1

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The most probable product in the following reaction is

asked Sep 3, 2013 by sreemathi.v

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An SN2 reaction in an asymmetric carbon of a compound always give

asked Sep 3, 2013 by sreemathi.v

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Arrange the following nucleophiles in the order of the nucleophilicity in protic solvents $SH^-,OAC^-,PHO^-,OH^-,H_2O$

asked Sep 3, 2013 by sreemathi.v

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Arrange the following in decreasing order of $SN_1$ reactivity

asked Sep 3, 2013 by sreemathi.v

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Refer to the below equation :

asked Sep 3, 2013 by sreemathi.v

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Which of the following statements correctly describes E1 reaction of alkyl halide?

asked Sep 3, 2013 by sreemathi.v

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How many 6 digit numbers can be formed using the digits 0,1,3,5,7,9 that are divisible by 5? (digits should not be repeated)

asked Aug 31, 2013 by rvidyagovindarajan_1

1 answer

The no. of ways in which 16 prizes can be distributed among 4 students so that each student get atleast 3 prizes is ?

asked Aug 31, 2013 by rvidyagovindarajan_1

1 answer

There are 4 balls of different colour and 4 boxes of colours, same as that of balls. The no. of ways in which the balls, one each in a box,could be placed such that a ball does not go to a box of its own colour is ?

asked Aug 31, 2013 by rvidyagovindarajan_1

1 answer

There are Five balls of different colour and 3 boxes of different size. The balls are to be placed in the boxes so that no box is empty. In how many ways this can be done?

asked Aug 31, 2013 by rvidyagovindarajan_1

1 answer

There are 2 white 3 black and 4 red balls. The no. of ways in which these balls can be arranged so that no two red balls can be together is? (Two balls of same colour are identical.)

asked Aug 31, 2013 by rvidyagovindarajan_1

1 answer

A person wishes to make as many different parties as he can out of 10 of his friends. Each party consist of same no. of friends. Out of these parties in how many parties a particular friend will be found?

asked Aug 31, 2013 by rvidyagovindarajan_1

1 answer

In how many ways can 5 identical rings can be worn on 4 fingers?

asked Aug 31, 2013 by rvidyagovindarajan_1

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A sphere of mass M and radius $R_2$ has a concentric cavity of radius $R_1$ as shown. The force F exerted by the sphere on a particle of mass m located at a distance r from the center of sphere varies as $(0 < r < \alpha)$

asked Aug 30, 2013 by meena.p

1 answer

A particle is fired upward with a speed of $20 \;Km/s$. The speed with which it will move in in interstellar space is

asked Aug 30, 2013 by meena.p

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Suppose universal gravitational constant starts to decrease, then

asked Aug 30, 2013 by meena.p

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If G is the universal gravitational constant and $\rho$ is the uniform density of a spherical planet. Then the shortest possible period of rotation of the planet can be

asked Aug 30, 2013 by meena.p

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A solid sphere of uniform density and radius 4 units is located with its center at origin O. Two spheres of equal radii/ units with their center $A(-2,0,0)$ and $B(2,0,0)$ respectively are taken out of the solid leaving behind cavities as shown Then

asked Aug 30, 2013 by meena.p

1 answer

If the angular velocity of a planet about its own axis is halved, the distance of geostationary satellite of this planet from the center of the planet will become

asked Aug 30, 2013 by meena.p

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The acceleration due to gravity on moon is only one sixth that of earth. If the earth and moon are assumed to have same densities the ratio of radii of moon and earth will be

asked Aug 29, 2013 by meena.p

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Period of revolution of an earth satellite close to surface of earth is 90 minutes. The time period of another satellite in an orbit at a distance three times the radius of earth from its surface will be

asked Aug 29, 2013 by meena.p

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The radius of planet is R. A satellite revolves around it in a circular orbit of radius r with angular speed 'w'. The acceleration due to gravity on the planet's surface will be

asked Aug 29, 2013 by meena.p

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A planet is moving in an elliptical path around the sun of shown speed of planet in position P and Q are $v_1$ and $v_2$ respectively with $SP= r_1\;and SQ=r_2$ then $v_1/v_2$ is equal to

asked Aug 29, 2013 by meena.p

1 answer

The magnitude of potential energy per unit mass of object at surface of earth is E. then the escape velocity of the object is

asked Aug 29, 2013 by meena.p

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Speed of a planet in an elliptical orbit with semi major axis 'a' about sum of mass M at a distance r from the sun is

asked Aug 29, 2013 by meena.p

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A smooth tunnel is dug along the radius of earth that ends at center. A ball is released from the surface of earth along tunnel. What is the velocity when it strike the center?

asked Aug 29, 2013 by meena.p

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The density of case of a planet is $s_1$ and that of the outer shell is $s_2$.The radius of case and that of the planet are R and 2R respectively. Gravitational acceleration at the surface of the planet is same as at a depth R. Find $\large\frac{s_1}{s_2}$

asked Aug 29, 2013 by meena.p

1 answer

A uniform rod of length $'l'$ whose mass per unit length is $\lambda$. The gravitational force on a particle of mass m located at a distance d from one end of the rod as shown is

asked Aug 29, 2013 by meena.p

1 answer

Two lines intersect at O. Points $A_1,A_2,........A_n$ are taken on one of them and $B_1,B_2,........B_n$ on other. The no. of triangles that can be drawn from with the help of these 2n points and point 'O' is ?

asked Aug 27, 2013 by rvidyagovindarajan_1

1 answer

The no. of rectangles in a chess board is ?

asked Aug 27, 2013 by rvidyagovindarajan_1

1 answer

In a tournament, each participant should play one game with other .Two participants fell ill after playing 3 games.each. If total games played is 84, the no. of participants in the tournament is ?

asked Aug 27, 2013 by rvidyagovindarajan_1

1 answer

In an election no. of candidates exceeds the number to be elected by 2. If a man can vote in 56 ways, then the no. of candidates is

asked Aug 27, 2013 by rvidyagovindarajan_1

1 answer

The number of ways in which we can select a committee from 4 men and 6 women so that the committee includes at least two men and at least twice as many women as men is?

asked Aug 27, 2013 by rvidyagovindarajan_1

1 answer

Ten persons are to speak in a meeting. The no. of ways in which this can be arranged if A wants to speak before B and B wants to speak before C, is ?

asked Aug 27, 2013 by rvidyagovindarajan_1

1 answer

Two satellites are moving in a common plane along circular paths. with one having angular velocity $w_1=1.09 \times 10^{-3} rad/s$ and another $w_2=1.08 \times 10^{-3}rad /s$. Find time interval which seperates the periodic approaches of the satellites to each other over minimum distance, if they are revolving in opposite sense.

asked Aug 26, 2013 by meena.p

1 answer

If a planet orbiting the sun in a circular orbit suddenly stops, it will fall onto the sun in a time n(T) where T is the period of planets revolution , then n is

asked Aug 26, 2013 by meena.p

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An artificial satellite of mass m moves in an orbit whose radius is n times the radius of earth. Assuming the resistance to the motion is proportional to square of velocity ie $F= av^2$ where a is a constant. How long will the satellite take to fall to earth. M-mass of earth R- radius of earth

asked Aug 26, 2013 by meena.p

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A body of mass m ascends from the earth's surface with zero initial velocity due to action of two forces as shown. The force $F$ varying with $h$ as $\hat F=-2m \vec {g} (1-ah)$ where a is constant. Find the maximum height atained by the body t

asked Aug 26, 2013 by meena.p

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Which of the following compounds undergoes solvolysis in aquoes ethanol most rapidly?

asked Aug 26, 2013 by sreemathi.v

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What is the product of the following reaction :

asked Aug 26, 2013 by sreemathi.v

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If a body is to be projected vertically upwards from the surface of the earth to reach a height nR then the velocity with which it is to be projected is

asked Aug 26, 2013 by meena.p

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Refer to the below equation :

asked Aug 26, 2013 by sreemathi.v

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When O-Flurotoluene is treated with sodium amide the product is

asked Aug 26, 2013 by sreemathi.v

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Refer to the below image :

asked Aug 26, 2013 by sreemathi.v

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Trace the major product of the following reaction

asked Aug 26, 2013 by sreemathi.v

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