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SAMPLE PAPER-2013
CLASS XI
Subject: Physics
SHORT ANSWER TYPE QUESTION-
1. Earth is continuously-pulling moon towards its centre. Why does not moon fall on to the
Earth?
2. Which has longer period of revolution, a satellite revolving close or away from the
surface of Earth?
3. Will 1 kg sugar e more at poles or at the e!uator?
". Why do different planets have different escape velocities?
#. Why does moon have no atmosphere?
\$. %f the Earth suddenly stops rotating aout its a&is, what would e the effect on the value
of 'g(? Will this effect e the same at poles?
). * person feels weightlessness in an artificial satellite of the Earth. +owever, a person
on the moon feels his weight, although moon is also a satellite of Earth. E&plain.
,. When a ody falls towards Earth, Earth moves towards the ody. Why is Earth(s motion
not noticed?
-. %f the force of gravity acts on all odies in proportion to their masses, why does not a
heavy ody fall correspondingly faster than a light ody?
1.. What is the ma&imum value of gravitational potential energy and where?
11. * spring alance is suspended inside an artificial satellite revolving around the Earth. %f
a ody of mass 2 kg is suspended from it, what would e its reading. E&plain.
12. Why does a tennis all ounce higher on a hill than on plains?
13. /ravellers on the moon tie heavy weight at their ack efore landing on the moon. Why?
1". 0alculate the force of attraction etween two alls each of mass 1 kg each, when their
centres are 1. cm apart.
1#. /he mean orital radius of the Earth around the sun is 1.# 1 1.
,
km. 0alculate the mass
of the sun.
1\$. * mass M is roken into two parts. +ow are two parts related so that force of
gravitational attraction etween the two parts is ma&imum?
1). +ow far from Earth must a ody e along a line towards the 2un so that the 2un(s
gravitational pull on it alances that of the Earth. 3istance etween 2un and Earth(s
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centre is 1.# 1 1.
1.
km. 4ass of 2un is 3.2" 1 1.
#
times mass of Earth.
1,. %f the radius of the Earth shrinks y 2..5, mass remaining unchanged, then how would
the value of acceleration due to gravity change?
1-. *t what height aove the Earth(s surface, the value of g is half of its value on Earth(s
surface? 6iven7 its radius is \$".. km.
NU%ERI&A'S
2.. * ody hanging from a spring stretches it y 1 cm at the Earth(s surface. +ow much will
the same ody stretch the spring at a place 1\$.. km aove the Earth(s surface? 8adius
of the Earth 9 \$".. km :H!t7 Weight of the suspended ody 9 2tretching force;
21. <ind the percentage decrease in weight of a ody, when taken 1\$ km elow the surface
of the Earth. /ake radius of the Earth as \$".. km.
22. +ow much elow the surface of Earth does the acceleration due to gravity
a. reduces to 3#5
. reduces y 3\$5 of its value on the surface of the Earth? 8adius of Earth 9 \$".. km.
23. +ow many times faster than its present speed the Earth should rotate so that the
apparent weight of an o=ect at e!uator ecomes >ero? 6iven radius of Earth 9 \$.3) 1
1.
\$
m. What would e the duration of the day in that case?
2". /wo heavy spheres each of mass 1.. kg and radius ..1 m are placed 1.. m apart on a
hori>ontal tale. What is the gravitational field and potential at the mid point of the line
=oining the centres of the spheres?
2#. /he mass of the Earth is \$.. 1 1.
2"
kg. 0alculate
a. the potential energy of a ody of mass 3#.# kg and
. the gravitational potential, at a distance of 3.3# 1 1.
1.
m from the centre of the Earth.
2\$. * rocket is fired vertically from the surface of 4ars with a speed of 2km?sec. %f 2.5 of its
initial energy is lost due to atmospheric resistance, how far will the rocket go from the
surface of 4ars efore returning to it? 4ass of 4ars 9 \$." 1 1.
23

kg radius of 4ars 9
33-# km. :H!t7 ,.5 of total energy on the surface of 4ars 9 total energy at height
h.;
2). /he radius of the Earth is R and the acceleration due to gravity at its surface is g.
0alculate the work re!uired in raising a ody of mass m to a height h from the surface
of the Earth.
2,. %f Earth has a mass - times and radius twice that of planet 4ars, calculate the minimum
speed re!uired y a rocket to pull out of gravitational force of 4ars. /ake the escape
speed on the surface of Earth to e 11.2 km?sec.
2-. 2how that the moon would depart forever if its speed were increased y "25.
3.. * remote sensing satellite of the Earth revolves in a circular orit at a height of 2#. km
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aove the Earth(s surface. What is the
a. @rital speed and :; period of revolution of the satellite? 8adius of the Earth 9 \$.3,
1 1.
\$
m.
31. * satellite orits the Earth at a height of ".. km aove the surface. +ow much energy
must e e&pended to rocket the satellite out of the Earth(s gravitational influence?
32. 4ass of satellite 9 ".. kg, 4ass of Earth 9 \$.. 1 1.
2"
kg, 8adius of Earth 9 \$." 1 1.
\$
m.
33. * ody is to e pro=ected vertically upwards from Earth(s surface to reach a height of
-8, where R is the radius of Earth. What is the velocity re!uired to do so? 6iven g 9 1.
m?s
2
and radius of the Earth 9 \$." 1 1.
\$
m.
3". %f the Earth e one half its present distance from the 2un, how many days will the
present one year on the surface of Earth have?
3#. * geostationary satellite is oriting the Earth at a height of \$8 aove the surface of
Earth, where R is the radius of the Earth. <ind the time period on another satellite at a
height of 2.#R from the surface of Earth in hours.
3\$. 2uppose there e&isted a planet that went around the 2un twice as fast as the Earth.
What would e its orital si>e as compared to that of the Earth?
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