Physics class 11 Question paper Class 11 Notes | EduRev

Class 11 : Physics class 11 Question paper Class 11 Notes | EduRev

 Page 1


SESSION ENDING EXAMINATION 
2012
CLASS: Xl
PHYSICS
Max marks:70
> Allquestions 
are compulsory,
There is no overall choice. However, an Internal choice
one question 
of two marks, one question 
of three
Time: 3h.s
has been provided 
ln
marks and all three
questions 
of five marks each.
Question numbers 1 to I are very
mark each.
Question numbers 
g 
to 18 are
marks each.
snon answer type questions, 
carrying one
short answer type questions, 
carrying two
Question numbers 19 lo 27 are also short answer type questions, 
carrying
three marks each.
Question numbers 28 to 30 are long answer type questions, 
carrying five
marks each.
Two bodies havinS different masses have the same linear momentum. Which 1
one ofthem will move faster?
1.
2.
5.
State the first law of Thermodvnamics.
Name the physical quantity 
whose unit in Sl system is Newton second.
The length of a seconds pendulum 
is 
,l' 
.lfthe length is halved find its new time period
The angular speed of inner layer of the whirl wind(Tornado) 
is alarmingly 
high.
Write the number of degrees offreedom for molecules ofa mono atomic gas.
Absolute temperature 
of a gas 
is increased four times. What will be the
increase in the rms velocity of its molecules?
The momentum of an object is doubled. How does its kinetic energy change?
I
7
1
'L
1
L
7.
8.
Page 2


SESSION ENDING EXAMINATION 
2012
CLASS: Xl
PHYSICS
Max marks:70
> Allquestions 
are compulsory,
There is no overall choice. However, an Internal choice
one question 
of two marks, one question 
of three
Time: 3h.s
has been provided 
ln
marks and all three
questions 
of five marks each.
Question numbers 1 to I are very
mark each.
Question numbers 
g 
to 18 are
marks each.
snon answer type questions, 
carrying one
short answer type questions, 
carrying two
Question numbers 19 lo 27 are also short answer type questions, 
carrying
three marks each.
Question numbers 28 to 30 are long answer type questions, 
carrying five
marks each.
Two bodies havinS different masses have the same linear momentum. Which 1
one ofthem will move faster?
1.
2.
5.
State the first law of Thermodvnamics.
Name the physical quantity 
whose unit in Sl system is Newton second.
The length of a seconds pendulum 
is 
,l' 
.lfthe length is halved find its new time period
The angular speed of inner layer of the whirl wind(Tornado) 
is alarmingly 
high.
Write the number of degrees offreedom for molecules ofa mono atomic gas.
Absolute temperature 
of a gas 
is increased four times. What will be the
increase in the rms velocity of its molecules?
The momentum of an object is doubled. How does its kinetic energy change?
I
7
1
'L
1
L
7.
8.
9.
10.
11.
State Hooke's law. Draw the labelled stress- st.ain 
graph for a cylindrical
specimen subjected to a gradually increasing stress,
A simple harmonic motion is represented by y(t)=5 cos(10t+0.2) y in meters
and't'in seconds .Calculate its amplitude 
,initia 
I phase and frequency.
A 40 kg shell is flying at 60 m/s. When it explodes, its onc : rft of 10 kg stops,
while the remaining 
part Jlies on. Find the velocity of the l. rr.
Obtain an expression for kinetic energy of a rotating body.
Deduce graphically the equation x{t).x(o)=Vo t+%at7 for uniformly accelerated
linear motion.
A carnot's engine absorbs 20001 of heat from the source of a heat engine at
2270c and rejects 1200.1 of heat during each cycle to the sink. Calculate
a) Efficiency ofthe [ngine
b) TemDe.ature of the sink
Distlnguish between extensive and intensive variables with one example fol
each
At what altitude above the earth's surface would the acceleration due to
gravity be half its value at the earth's surface{R=6400 km}
(oR)
The acceleration due to gravity at a depth'd' reduces by 25% from the value at
the surface. Calculate the value of'd' if radius of earth is 6400 km.
2
2
t2.
14.
f7. Write the expression for potential energy stored in a spring of spring constant
'k'. Sketch the 
graph showing the variation of KE, PE and total energy of an
elastic spring with displacement,
Prove that the oscillations of a mass 'm' attached to a spring are simple
harmontc.
State the laws of limiting friction. The coefficient of static fiction between
block A and the tableis o.2.what would be the maximum mass of block B so
18.
19.
Page 3


SESSION ENDING EXAMINATION 
2012
CLASS: Xl
PHYSICS
Max marks:70
> Allquestions 
are compulsory,
There is no overall choice. However, an Internal choice
one question 
of two marks, one question 
of three
Time: 3h.s
has been provided 
ln
marks and all three
questions 
of five marks each.
Question numbers 1 to I are very
mark each.
Question numbers 
g 
to 18 are
marks each.
snon answer type questions, 
carrying one
short answer type questions, 
carrying two
Question numbers 19 lo 27 are also short answer type questions, 
carrying
three marks each.
Question numbers 28 to 30 are long answer type questions, 
carrying five
marks each.
Two bodies havinS different masses have the same linear momentum. Which 1
one ofthem will move faster?
1.
2.
5.
State the first law of Thermodvnamics.
Name the physical quantity 
whose unit in Sl system is Newton second.
The length of a seconds pendulum 
is 
,l' 
.lfthe length is halved find its new time period
The angular speed of inner layer of the whirl wind(Tornado) 
is alarmingly 
high.
Write the number of degrees offreedom for molecules ofa mono atomic gas.
Absolute temperature 
of a gas 
is increased four times. What will be the
increase in the rms velocity of its molecules?
The momentum of an object is doubled. How does its kinetic energy change?
I
7
1
'L
1
L
7.
8.
9.
10.
11.
State Hooke's law. Draw the labelled stress- st.ain 
graph for a cylindrical
specimen subjected to a gradually increasing stress,
A simple harmonic motion is represented by y(t)=5 cos(10t+0.2) y in meters
and't'in seconds .Calculate its amplitude 
,initia 
I phase and frequency.
A 40 kg shell is flying at 60 m/s. When it explodes, its onc : rft of 10 kg stops,
while the remaining 
part Jlies on. Find the velocity of the l. rr.
Obtain an expression for kinetic energy of a rotating body.
Deduce graphically the equation x{t).x(o)=Vo t+%at7 for uniformly accelerated
linear motion.
A carnot's engine absorbs 20001 of heat from the source of a heat engine at
2270c and rejects 1200.1 of heat during each cycle to the sink. Calculate
a) Efficiency ofthe [ngine
b) TemDe.ature of the sink
Distlnguish between extensive and intensive variables with one example fol
each
At what altitude above the earth's surface would the acceleration due to
gravity be half its value at the earth's surface{R=6400 km}
(oR)
The acceleration due to gravity at a depth'd' reduces by 25% from the value at
the surface. Calculate the value of'd' if radius of earth is 6400 km.
2
2
t2.
14.
f7. Write the expression for potential energy stored in a spring of spring constant
'k'. Sketch the 
graph showing the variation of KE, PE and total energy of an
elastic spring with displacement,
Prove that the oscillations of a mass 'm' attached to a spring are simple
harmontc.
State the laws of limiting friction. The coefficient of static fiction between
block A and the tableis o.2.what would be the maximum mass of block B so
18.
19.
that the twoblocks do not move.(The string and the 
pulley are assumed to be
smoothand massless, 
C=1om/s'z )
20. Explain with a diagram, how banking provides the centripetal force necessary 3
for a car moving along a circular path. Hence derive the expression for
maximum veloclty with which a vehicle takes a safe turn on a banked road
21. The distance of two planets from sun are 1013 and 1012 m respectively. 3
Find the ratio of
lTime period
2.speed of the two planets
22. The velocity of water waves may depend on their wavelength ,\,density of 3
water p and acceleration due to gravity'g'. Find the relation between these
quantities by the method of dimensions.
23. State and explain perpendicular axis theorem. The moment of inertia of a disc 3
of mass'M' and radius 'R' about any of its diameter is lvR'?A.Find its moment
of inertia about an axis normal to the disc and passing through a 
point on its
edge.
2+ a) State Weins displacement law. 3
b)The wavelength corresponding to E.u, for moon is 14 microns. Estimate the
temperature of moon(b=2.884 X 1O3 km)
(oR)
a) Define coefflcient of thermal conductivity.
b) Describe an experimeni to find the thermal conductivity of a good
conductor
25. Write the characteristics of elastic collision. Prove that in one dimensional 3
elastic collision the relative velocity of separation is numerically equal to the
relatlve velocity of approach.
26, The motion of a 
particle along a straight line is described by the equation 3
x=6+4t 
z-tawhere 
x is in meters and t in seconds. Find the position, velocity and
acceldhtion ofthe 
particle at t=2 seconds.
27. Obtain an expression for pressure exerted by an ideal gas, using the postulates 3
of k;netic theory of gases.
Page 4


SESSION ENDING EXAMINATION 
2012
CLASS: Xl
PHYSICS
Max marks:70
> Allquestions 
are compulsory,
There is no overall choice. However, an Internal choice
one question 
of two marks, one question 
of three
Time: 3h.s
has been provided 
ln
marks and all three
questions 
of five marks each.
Question numbers 1 to I are very
mark each.
Question numbers 
g 
to 18 are
marks each.
snon answer type questions, 
carrying one
short answer type questions, 
carrying two
Question numbers 19 lo 27 are also short answer type questions, 
carrying
three marks each.
Question numbers 28 to 30 are long answer type questions, 
carrying five
marks each.
Two bodies havinS different masses have the same linear momentum. Which 1
one ofthem will move faster?
1.
2.
5.
State the first law of Thermodvnamics.
Name the physical quantity 
whose unit in Sl system is Newton second.
The length of a seconds pendulum 
is 
,l' 
.lfthe length is halved find its new time period
The angular speed of inner layer of the whirl wind(Tornado) 
is alarmingly 
high.
Write the number of degrees offreedom for molecules ofa mono atomic gas.
Absolute temperature 
of a gas 
is increased four times. What will be the
increase in the rms velocity of its molecules?
The momentum of an object is doubled. How does its kinetic energy change?
I
7
1
'L
1
L
7.
8.
9.
10.
11.
State Hooke's law. Draw the labelled stress- st.ain 
graph for a cylindrical
specimen subjected to a gradually increasing stress,
A simple harmonic motion is represented by y(t)=5 cos(10t+0.2) y in meters
and't'in seconds .Calculate its amplitude 
,initia 
I phase and frequency.
A 40 kg shell is flying at 60 m/s. When it explodes, its onc : rft of 10 kg stops,
while the remaining 
part Jlies on. Find the velocity of the l. rr.
Obtain an expression for kinetic energy of a rotating body.
Deduce graphically the equation x{t).x(o)=Vo t+%at7 for uniformly accelerated
linear motion.
A carnot's engine absorbs 20001 of heat from the source of a heat engine at
2270c and rejects 1200.1 of heat during each cycle to the sink. Calculate
a) Efficiency ofthe [ngine
b) TemDe.ature of the sink
Distlnguish between extensive and intensive variables with one example fol
each
At what altitude above the earth's surface would the acceleration due to
gravity be half its value at the earth's surface{R=6400 km}
(oR)
The acceleration due to gravity at a depth'd' reduces by 25% from the value at
the surface. Calculate the value of'd' if radius of earth is 6400 km.
2
2
t2.
14.
f7. Write the expression for potential energy stored in a spring of spring constant
'k'. Sketch the 
graph showing the variation of KE, PE and total energy of an
elastic spring with displacement,
Prove that the oscillations of a mass 'm' attached to a spring are simple
harmontc.
State the laws of limiting friction. The coefficient of static fiction between
block A and the tableis o.2.what would be the maximum mass of block B so
18.
19.
that the twoblocks do not move.(The string and the 
pulley are assumed to be
smoothand massless, 
C=1om/s'z )
20. Explain with a diagram, how banking provides the centripetal force necessary 3
for a car moving along a circular path. Hence derive the expression for
maximum veloclty with which a vehicle takes a safe turn on a banked road
21. The distance of two planets from sun are 1013 and 1012 m respectively. 3
Find the ratio of
lTime period
2.speed of the two planets
22. The velocity of water waves may depend on their wavelength ,\,density of 3
water p and acceleration due to gravity'g'. Find the relation between these
quantities by the method of dimensions.
23. State and explain perpendicular axis theorem. The moment of inertia of a disc 3
of mass'M' and radius 'R' about any of its diameter is lvR'?A.Find its moment
of inertia about an axis normal to the disc and passing through a 
point on its
edge.
2+ a) State Weins displacement law. 3
b)The wavelength corresponding to E.u, for moon is 14 microns. Estimate the
temperature of moon(b=2.884 X 1O3 km)
(oR)
a) Define coefflcient of thermal conductivity.
b) Describe an experimeni to find the thermal conductivity of a good
conductor
25. Write the characteristics of elastic collision. Prove that in one dimensional 3
elastic collision the relative velocity of separation is numerically equal to the
relatlve velocity of approach.
26, The motion of a 
particle along a straight line is described by the equation 3
x=6+4t 
z-tawhere 
x is in meters and t in seconds. Find the position, velocity and
acceldhtion ofthe 
particle at t=2 seconds.
27. Obtain an expression for pressure exerted by an ideal gas, using the postulates 3
of k;netic theory of gases.
28. a) Derive an expression for the height 'h' of a liquid of density 'p' rising 5
through a capillary tube of radlus 'a'
b) small drops of water are spherical 
,while 
large ones are flat . Explain
(oR)
a) What is meant by terminal velocity
b) Write an expression forviscous force on the basis of Stoke's formula
c) Hence derive an expression for terminal velocity of a spherical body in
terms of radius of the body, density of the liquid and object and viscosity
ofthe liquid.
29. (a) show that the path followed by a projectile is parabolic, when it is 5
projected at an angle'0'with the horizontal.
b) Prove that the maximum horizontal range is four times the maximum
height attained by a projectile, which is fired along the requiled oblique
direction.
(oR)
a) State parallelogram law of vector addition
b) Find the magnitude and direction of the resultant of two vectors 'A' & 'B'
inclined at an argle '0'
c) An object of mass'm' is moving in an circular path of radius 'R'with linear
velocity 'v' . Obtain an expression for 'v' in terms of w.
30. a) Write NeMon's formula fof speed of sound in a 
gaseous medium. What is 5
the correction applied by Laplace and Why?
b) At what temperature will the velocity of sound be double its value at 273K,
{oR)
a) What is Doppler Effect
b) Derive an expression of apparent frequency of sound, when both the
source and the observer are in motion.
c) A train standing at the outer signal of railway station blows a,lshistle of
frequency 400 Hz in still air. Find the frequency of the whistle when the
train approaches the platform with a speed of mrn/s.(speed of sound in
stillair= 340 m/s.)
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