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Mean distance of mars from sun is 1.524 times the distance of earth from sun. The period of revolution of mars around the sun is
jeemain
physics
class11
unit6
gravitation
q72
medium
asked
Aug 24, 2013
by
meena.p
1
answer
If a graph is plotted between $T^2$ and $r^3$ for a planet the slope will be
jeemain
physics
class11
unit6
gravitation
q71
medium
asked
Aug 24, 2013
by
meena.p
1
answer
A particle is suspended from a spring and it stretches the spring by 1 cm on the surface of the earth. The same particle will stretch the same spring at a place 800 Km above the earth by
jeemain
physics
class11
unit6
gravitation
q70
medium
asked
Aug 24, 2013
by
meena.p
1
answer
The radius of the earth $R_e$ and the acceleration due to gravity at its surface is g. The work required to rising a body of mass m to height h from the surface of the earth will be
jeemain
physics
class11
unit6
gravitation
q69
medium
asked
Aug 23, 2013
by
meena.p
1
answer
Three particles of equal mass m are situated at verticles of a equilateral triangle of side l. What should be velocity of each particle so that they move on a circular path without changing l
jeemain
physics
class11
unit6
gravitation
q68
medium
asked
Aug 23, 2013
by
meena.p
1
answer
What would be the angular speed of earth, so that bodies lying on equator may appear weightless? $(g=10 m/s^2\; R=6400km)$
jeemain
physics
class11
unit6
gravitation
q67
medium
asked
Aug 23, 2013
by
meena.p
1
answer
Two bodies of mass $10^2 kg$ and $10^3kg$ are lying 1m apart. The gravitational potential at mid point of line joining them is
jeemain
physics
class11
unit6
gravitation
q66
medium
asked
Aug 23, 2013
by
meena.p
1
answer
A mass M is split into two parts m and (M-m) which are then separated by a certain distance. What ratio of m/M maximise the gravitational force between the parts?
jeemain
physics
class11
unit6
gravitation
q65
medium
asked
Aug 23, 2013
by
meena.p
1
answer
A geostationary satellite is orbiting the earth at a height of 6R where R is radius of earth. The time period of another satellite at a height of $2.5 R$ from the surface of earth is
jeemain
physics
class11
unit6
gravitation
q64
easy
asked
Aug 23, 2013
by
meena.p
1
answer
Refer to the image below :
jeemain
chemistry
unit22
organic-chemistry
halogens
q9
medium
asked
Aug 23, 2013
by
sreemathi.v
1
answer
The ratio of radius of two planets is K and ratio of acceleration due to gravity of both planet is G. What will be the ratio of their escape velocity ?
jeemain
physics
class11
unit6
gravitation
q63
easy
asked
Aug 23, 2013
by
meena.p
1
answer
About reactivity in SN1reaction following statements are noted .Pick out the correct pair
jeemain
chemistry
unit22
organic-chemistry
halogens
q8
medium
asked
Aug 23, 2013
by
sreemathi.v
1
answer
n-Propyl chloride would give SN2 reactions underwhich of the following conditions?
jeemain
chemistry
unit22
organic-chemistry
halogens
q7
medium
asked
Aug 23, 2013
by
sreemathi.v
1
answer
Which of the following are correct statements regarding unimolecular SN1
jeemain
chemistry
unit22
organic-chemistry
halogens
q6
medium
asked
Aug 23, 2013
by
sreemathi.v
1
answer
Which of the following are correct order of nucleophilicity in meoH
jeemain
chemistry
unit22
organic-chemistry
halogens
q5
easy
asked
Aug 23, 2013
by
sreemathi.v
1
answer
The compound that undergoes SN1 reaction most rapidly is
jeemain
chemistry
unit22
organic-chemistry
halogens
q4
medium
asked
Aug 23, 2013
by
sreemathi.v
1
answer
The rate of solvolysis of the following allyl chloride in 50% aqueous ethanol at $44^{\circ}C$ is
jeemain
chemistry
unit22
organic-chemistry
halogens
q3
medium
asked
Aug 23, 2013
by
sreemathi.v
1
answer
Refer to the below image : Assuming both the reactions are E1 the expected ratio between $K_H/K_D$ is
jeemain
chemistry
unit22
organic-chemistry
halogens
q2
medium
asked
Aug 23, 2013
by
sreemathi.v
1
answer
The mass of earth is $6.00 \times 10^{24} \;kg $ and that of the moon is $7.40 \times 10 ^{22} \;kg \;$ and $G= 6.67 \times 10^{-11} Nm^2 /kg^2$. potential energy of the system is $-7.79 \times 10^{28} J$. The mean distance of between earth and moon is
jeemain
physics
class11
unit6
gravitation
q62
easy
asked
Aug 23, 2013
by
meena.p
1
answer
Which of the following can give both $E$ and $Z$ products?
jeemain
chemistry
unit22
organic-chemistry
halogens
q1
medium
asked
Aug 23, 2013
by
sreemathi.v
1
answer
At higher temperature iodoform reaction is given by
jeemain
chemistry
unit22
organic-chemistry
halogens
q15
easy
asked
Aug 23, 2013
by
sreemathi.v
1
answer
Allyl chloride on dehydrochlorination gives
jeemain
chemistry
unit22
organic-chemistry
halogens
q14
easy
asked
Aug 23, 2013
by
sreemathi.v
1
answer
Which of the following is most reactive towards SN2 reaction?
jeemain
chemistry
unit22
organic-chemistry
halogens
q13
easy
asked
Aug 23, 2013
by
sreemathi.v
1
answer
The gravitational field due to mass distribution is $ E= k/x^3$ in the x direction where k is a constant. Taking gravitational potential to be zero at infinity, its value at a distance x is
jeemain
physics
class11
unit6
gravitation
q61
easy
asked
Aug 23, 2013
by
meena.p
1
answer
What is the acceleration due to gravity at surface of mass if its diameter is $6760\;km$ and mass is one tenth that of earth. The diameter of earth is $12742\;km$ acceleration due to gravity on earth $=9.8 m/s^2$
jeemain
physics
class11
unit6
gravitation
q60
easy
asked
Aug 23, 2013
by
meena.p
1
answer
A stone is dropped freely into a tunnel along the diameter of the earth. When it reaches the center of earth then it has only
jeemain
physics
class11
unit6
gravitation
q59
easy
asked
Aug 23, 2013
by
meena.p
1
answer
At what height from the ground will the value of 'g' be the same as that in 10 km deep mine below the surface of earth
jeemain
physics
class11
unit6
gravitation
q58
easy
asked
Aug 23, 2013
by
meena.p
1
answer
A planet moves in an elliptical orbit with sun at one of its focii <br> 1) In path QRP work done by gravity is positive . <br> 2) In path PSQ work done by gravity is negative . <br> 3) Linear velocity of rotation from Q to P via R decreases. <br> 4) Gravitational potential energy increases in going from P to Q via R
jeemain
physics
class11
unit6
gravitation
q57
easy
asked
Aug 22, 2013
by
meena.p
1
answer
The Planet mercury is revolving in an elliptical orbit around the sun as shown. Kinetic energy will be greatest at
jeemain
physics
class11
unit6
gravitation
q56
easy
asked
Aug 22, 2013
by
meena.p
1
answer
As measured by an observer on earth, what would be the difference, if any, in the period of two satellite each in a circular orbit near the earth's equatorial plane, but one moving eastward and other moving westward.
jeemain
physics
class11
unit6
gravitation
q55
easy
asked
Aug 22, 2013
by
meena.p
1
answer
A satellite of mass m is orbiting the earth at a height 'h' from its surface. If M is Mass of the earth and R its radius then how much energy must be spent to pull the satellite out of the earth's gravitational field?
jeemain
physics
class11
unit6
gravitation
q54
easy
asked
Aug 22, 2013
by
meena.p
1
answer
If the distance between Earth and the sun were half its present value, the number of days in a year would be
jeemain
physics
class11
unit6
gravitation
q53
easy
asked
Aug 22, 2013
by
meena.p
1
answer
The mean radius of earth is R, its angular velocity on its own axis is 'w' and acceleration due to gravity is g. What will be the radius of orbit of a geostationary satellite ?
jeemain
physics
class11
unit6
gravitation
q52
medium
asked
Aug 22, 2013
by
meena.p
1
answer
A satellite revolving in a circular equatorial orbit of radius $r= 2 \times 10 ^4 km$ from west to East appears over a certain point at the equator every $11.6$ hours. Calculate the actual angular velocity of the satellite
jeemain
physics
class11
unit6
gravitation
q51
medium
asked
Aug 22, 2013
by
meena.p
1
answer
A geo stationary satellite orbits around the earth in a circular orbit of radius $36000km$. Then the time period of a spy satellite orbiting a few Kilometers above the earth's surface $(R_{earth}=6400 Km)$ will be approximately
jeemain
physics
class11
unit6
gravitation
q50
medium
asked
Aug 22, 2013
by
meena.p
1
answer
Refer to the image below :
jeemain
chemistry
unit22
organic-chemistry
halogens
q12
easy
asked
Aug 22, 2013
by
sreemathi.v
1
answer
Predict the product
jeemain
chemistry
unit22
organic-chemistry
halogens
q11
easy
asked
Aug 22, 2013
by
sreemathi.v
1
answer
Which of the following represents the correct graph for SN2 reaction?
jeemain
chemistry
unit22
organic-chemistry
halogens
q10
easy
asked
Aug 22, 2013
by
sreemathi.v
1
answer
A satellite of mass $m_s$ revolving in a circular orbit of radius $r_s$ round the earth of mass M has a total energy E. Then its angular momentum will be
jeemain
physics
class11
unit6
gravitation
q49
difficult
asked
Aug 22, 2013
by
meena.p
1
answer
Refer to the below image :
jeemain
chemistry
unit22
organic-chemistry
halogens
q9
easy
asked
Aug 22, 2013
by
sreemathi.v
1
answer
A satellite is seen after each 8 hours over equator at a place on earth when its sence of rotation is opposite to the earth. The time interval after which it can be seen at the same place when sense of rotation of earth and satellite is same , will be
jeemain
physics
class11
unit6
gravitation
q48
medium
asked
Aug 22, 2013
by
meena.p
1
answer
The predominant product formed when 3− methyl −2−pentene reacts with $HOCl$ is
jeemain
chemistry
unit22
organic-chemistry
halogens
q8
easy
asked
Aug 22, 2013
by
sreemathi.v
1
answer
A satellite can be in a geostationary orbit around the earth at a distance r from the center. If the angular velocity of earth about its axis doubles, a satellite can now be in a geostationary orbit around earth if its distance from the center is
jeemain
physics
class11
unit6
gravitation
q47
medium
asked
Aug 22, 2013
by
meena.p
1
answer
In which of the following pair one species is incorrectly indicated which would give higher Substitution /Elimination ratio when it reacts with isopropyl bromide.
jeemain
chemistry
unit22
organic-chemistry
halogens
q7
easy
asked
Aug 22, 2013
by
sreemathi.v
1
answer
The height to which the acceleration due to gravity becomes $\large\frac{g}{9}$ (where g= acceleration due to gravity at surface of earth ) in terms of $R$, is
jeemain
physics
class11
unit6
gravitation
q46
medium
asked
Aug 21, 2013
by
meena.p
1
answer
Three identical stars each of mass M form an equilateral triangle that rotates around the center of the triangle. The system is isolated and edge length of the triangle of the triangle is L. The amount of work that is required to dismantle the system is
jeemain
physics
class11
unit6
gravitation
q45
medium
asked
Aug 21, 2013
by
meena.p
1
answer
An object of mass m starts falling towards planet of mass M and Radius R. As it reaches near the surface it passes through a small hole in the planet. The planet is made of two pieces, a sperical shell of negligible thickness and mass $\large\frac{2M}{3}$ and a point mass of $\large\frac{M}{3}$ at center. Change in the force of gravity experienced by the object is
jeemain
physics
class11
unit6
gravitation
q44
medium
asked
Aug 21, 2013
by
meena.p
1
answer
Refer to the below equation :
jeemain
chemistry
unit22
organic-chemistry
halogens
q6
easy
asked
Aug 21, 2013
by
sreemathi.v
1
answer
A geostationary satellite is at a height h above the surface of the earth If R is radius of earth 1) The mimimum coaltitude on earth upto which the satellite can be used for communication is $\sin ^{-1} \bigg(\large\frac{R}{R+a}\bigg)$ 2) The maximum coaltitude on earth upto which the satellite can be used for communication is $\sin ^{-1} \bigg(\large\frac{R}{R+h}\bigg)$ 3) Area of earth escaped from this satellite is given by $ (2 \pi R^2(1+\sin \theta)$ 4) Area of earth escaped from this satellite is given by $ (2 \pi R^2(1+\cos \theta)$
jeemain
physics
class11
unit6
gravitation
q43
difficult
asked
Aug 21, 2013
by
meena.p
1
answer
Four similar particles of mass M are orbiting in a circle of radius r in the same angular direction because of their mutual gravitational attraction, velocity of particle is
jeemain
physics
class11
unit6
gravitation
q42
difficult
asked
Aug 21, 2013
by
meena.p
1
answer
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