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Published on: 29/08/2019
Gravitation
Download CBSE Class 11th Standard CBSE Physics question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 11th Standard CBSE Physics
Questions + Answers key
Take MCQ Physics Test
1.
Is the Kepler's law kinematic?
2.
Do the force of friction and other contact forces arise due to gravitational attraction? If not, then what is the origin of these forces?
3.
By which law is the Kepler's law of areas identical?
4.
If earth be at one half its present distance from the sun, then how many days will there be in a year?
5.
How earth retains most of the atmosphere?
6.
Mars has about 1/10th as much mass as the earth and half as great a diameter. TI1e acceleration of a falling body on Mars is about
9.8 m s-2
1.96 ms-2
3.92 m s-2
4.9 m s-2
7.
A satellite of mass m revolves around the earth of radius R at a height x from its surface. If g is the acceleration due to gravity on the surface of the earth, the orbital speed of the satellite is
gx
\(\frac{gR}{R-x}\)
\(\frac{gR^2}{R+x}\)
\((\frac{gR^2}{R+x})^{\frac{1}{2}}\)
8.
If three uniform spheres, each having mass M and radius r, are kept in such a way that each touches the other two, the magnitude of the gravitational force on any sphere due to the other two is
\(\frac{GM^2}{4r^2}\)
\(\frac{2GM^2}{r^2}\)
\(\frac{2GM^2}{4r^2}\)
\(\frac{\sqrt 3GM^2}{4r^2}\)
9.
If g is the acceleration due to gravity on the earth's surface, the gain in the potential energy of an object of mass m raised from the earth's surface to a height equal to the radius R of the earth,is
\(\frac{1}{2}mgR\)
2mgR
mgR
\(\frac{1}{4}mgR\)
10.
A satellite is orbiting the earth. If its distance from the earth is increased, its
angular velocity would increase
linear velocity would increase
angular velocity would decrease
time period would increase
1.
Yes, because kepler's third law is the relation between distance and time.
2.
Contact forces have electrical region.
3.
The law of conservation of angular momentum.
4.
\(T^{ 2 }\alpha R^{ 3 }\)
Hence, \(\frac { { T }_{ 1 }^{ 2 } }{ { T }_{ 2 }^{ 2 } } =\frac { { R }_{ 1 }^{ 3 } }{ { R }_{ 2 }^{ 3 } } \Rightarrow { T }_{ 2 }^{ 2 }=\left[ \frac { { R }_{ 2 } }{ { R }_{ 1 } } \right] ^{ 3 }T_{ 1 }^{ 2 }\)
\(\Rightarrow T_{ 2 }=T_{ 1 }\left[ \frac { R_{ 2 } }{ { R }_{ 1 } } \right] ^{ 3/2 }=365\left( \frac { R/2 }{ R } \right) ^{ 3/2 }
\)
\(=365\times \frac { 1 }{ \sqrt [ 2 ]{ 2 } } =129\ days\)
5.
Earth retains most of the atmosphere due to force of gravity.
6.
(c)
3.92 m s-2
7.
(d)
\((\frac{gR^2}{R+x})^{\frac{1}{2}}\)
8.
(d)
\(\frac{\sqrt 3GM^2}{4r^2}\)
9.
(a)
\(\frac{1}{2}mgR\)
10.
(a)
angular velocity would increase
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