Page 1
CBSE | Physics
Sample Paper 3
CBSE Board
Class XI Physics
Sample Paper-3
Time: - 3 Marks: - 70 Marks
General Instructions
(a) All questions are compulsory.
(b) There are 29 questions in total. Questions 1 to 8 carry one mark each, questions 9 to
16 carry two marks each, questions 17 to 25 carry three marks each and questions
27 to 29 carry five marks each.
(c) Question 26 is a value based question carrying four marks.
(d) There is no overall choice. However, an internal choice has been provided in one
question of two marks, one question of three marks and all three questions of five
marks each. You have to attempt only one of the given choices in such questions.
(e) Use of calculator is not permitted.
(f) You may use the following physical constants wherever necessary.
19
81
34
72
23 1
23
27
1.6 10
3 10
6.6 10
4 10
1.38 10
6.023 10 /
1.6 10
o
B
A
n
N
eC
c ms
h JS
A
k JK
N mole
m kg
??
?
?
?
??
?
?
??
??
??
??
??
??
??
1. Can a physical quantity have units but still be dimensionless? (1)
2. Give an example to show that the direction of velocity of a body can change even when
its acceleration is constant. (1)
3. Two vectors A and B are directed along y-axis and z-axis respectively. What is the
direction of the vector ? (B A) ? (1)
Page 2
CBSE | Physics
Sample Paper 3
CBSE Board
Class XI Physics
Sample Paper-3
Time: - 3 Marks: - 70 Marks
General Instructions
(a) All questions are compulsory.
(b) There are 29 questions in total. Questions 1 to 8 carry one mark each, questions 9 to
16 carry two marks each, questions 17 to 25 carry three marks each and questions
27 to 29 carry five marks each.
(c) Question 26 is a value based question carrying four marks.
(d) There is no overall choice. However, an internal choice has been provided in one
question of two marks, one question of three marks and all three questions of five
marks each. You have to attempt only one of the given choices in such questions.
(e) Use of calculator is not permitted.
(f) You may use the following physical constants wherever necessary.
19
81
34
72
23 1
23
27
1.6 10
3 10
6.6 10
4 10
1.38 10
6.023 10 /
1.6 10
o
B
A
n
N
eC
c ms
h JS
A
k JK
N mole
m kg
??
?
?
?
??
?
?
??
??
??
??
??
??
??
1. Can a physical quantity have units but still be dimensionless? (1)
2. Give an example to show that the direction of velocity of a body can change even when
its acceleration is constant. (1)
3. Two vectors A and B are directed along y-axis and z-axis respectively. What is the
direction of the vector ? (B A) ? (1)
CBSE | Physics
Sample Paper 3
4. What does the area of the shaded portion of the graph represent? (1)
5. Why do we prefer to use a wrench (spanner) of longer arm? (1)
6. What is the degree of freedom of a monoatomic gas? (1)
7. For an ideal gas, show the nature of
PV
nT
versus P graph, where the symbols have their
usual meaning. (1)
8. State the Kelvin-Planck statement of the second law of thermodynamics. (1)
9. Differentiate between systematic errors and random errors. (2)
10. Two blocks of mass 3 kg and 2 kg are in contact with each other on a frictionless table.
Find the force exerted by the smaller block on bigger block if a force of 5 N is applied on
the bigger block. (2)
OR
Mention two ways in which static friction is a self adjusting force. How much force of
static friction is acting on the block of mass 2 kg shown in figure below if the coefficient
of static friction between the block and the surface is 0.2? (2)
11. The kinetic energy of a body is increased by 21%. What is the percentage increase in
the linear momentum of the body? (2)
Page 3
CBSE | Physics
Sample Paper 3
CBSE Board
Class XI Physics
Sample Paper-3
Time: - 3 Marks: - 70 Marks
General Instructions
(a) All questions are compulsory.
(b) There are 29 questions in total. Questions 1 to 8 carry one mark each, questions 9 to
16 carry two marks each, questions 17 to 25 carry three marks each and questions
27 to 29 carry five marks each.
(c) Question 26 is a value based question carrying four marks.
(d) There is no overall choice. However, an internal choice has been provided in one
question of two marks, one question of three marks and all three questions of five
marks each. You have to attempt only one of the given choices in such questions.
(e) Use of calculator is not permitted.
(f) You may use the following physical constants wherever necessary.
19
81
34
72
23 1
23
27
1.6 10
3 10
6.6 10
4 10
1.38 10
6.023 10 /
1.6 10
o
B
A
n
N
eC
c ms
h JS
A
k JK
N mole
m kg
??
?
?
?
??
?
?
??
??
??
??
??
??
??
1. Can a physical quantity have units but still be dimensionless? (1)
2. Give an example to show that the direction of velocity of a body can change even when
its acceleration is constant. (1)
3. Two vectors A and B are directed along y-axis and z-axis respectively. What is the
direction of the vector ? (B A) ? (1)
CBSE | Physics
Sample Paper 3
4. What does the area of the shaded portion of the graph represent? (1)
5. Why do we prefer to use a wrench (spanner) of longer arm? (1)
6. What is the degree of freedom of a monoatomic gas? (1)
7. For an ideal gas, show the nature of
PV
nT
versus P graph, where the symbols have their
usual meaning. (1)
8. State the Kelvin-Planck statement of the second law of thermodynamics. (1)
9. Differentiate between systematic errors and random errors. (2)
10. Two blocks of mass 3 kg and 2 kg are in contact with each other on a frictionless table.
Find the force exerted by the smaller block on bigger block if a force of 5 N is applied on
the bigger block. (2)
OR
Mention two ways in which static friction is a self adjusting force. How much force of
static friction is acting on the block of mass 2 kg shown in figure below if the coefficient
of static friction between the block and the surface is 0.2? (2)
11. The kinetic energy of a body is increased by 21%. What is the percentage increase in
the linear momentum of the body? (2)
CBSE | Physics
Sample Paper 3
12. Find the magnitude and direction of angular momentum of the body of mass m (about
point O) which is moving with velocity ? as shown. (2)
13. Name the satellites which have Sun synchronous orbit. How is their orbit different from
that of the satellites used for communication purpose? What is the significance of
negative total energy of a satellite? (2)
14. Define breaking stress. A heavy wire is suspended from a roof and no weight is attached
to its lower end. Is it under stress? (2)
15. Calculate the fall in pressure of helium initially at 1600 P a, when it is suddenly
expended to 8 times its original volume. Given ? =
5
3
. (2)
16. What is the change in internal energy of a gas during (i) isothermal expansion and (ii)
adiabatic expansion? (2)
17. On a two lane road, car A is travelling with a speed of 36 km/h. Two cars B and C
approach car A from opposite directions with speeds of 54 km/h each. At a certain
instant, when both car B and C are at a distance of 1 km from A, B decides to overtake
car A before C does. What minimum acceleration of B is required to avert an accident?
(3)
18. A particle of mass m moves in a straight line with retardation proportional to its
displacement. Find the expression for loss of kinetic energy for any displacement x. (3)
Page 4
CBSE | Physics
Sample Paper 3
CBSE Board
Class XI Physics
Sample Paper-3
Time: - 3 Marks: - 70 Marks
General Instructions
(a) All questions are compulsory.
(b) There are 29 questions in total. Questions 1 to 8 carry one mark each, questions 9 to
16 carry two marks each, questions 17 to 25 carry three marks each and questions
27 to 29 carry five marks each.
(c) Question 26 is a value based question carrying four marks.
(d) There is no overall choice. However, an internal choice has been provided in one
question of two marks, one question of three marks and all three questions of five
marks each. You have to attempt only one of the given choices in such questions.
(e) Use of calculator is not permitted.
(f) You may use the following physical constants wherever necessary.
19
81
34
72
23 1
23
27
1.6 10
3 10
6.6 10
4 10
1.38 10
6.023 10 /
1.6 10
o
B
A
n
N
eC
c ms
h JS
A
k JK
N mole
m kg
??
?
?
?
??
?
?
??
??
??
??
??
??
??
1. Can a physical quantity have units but still be dimensionless? (1)
2. Give an example to show that the direction of velocity of a body can change even when
its acceleration is constant. (1)
3. Two vectors A and B are directed along y-axis and z-axis respectively. What is the
direction of the vector ? (B A) ? (1)
CBSE | Physics
Sample Paper 3
4. What does the area of the shaded portion of the graph represent? (1)
5. Why do we prefer to use a wrench (spanner) of longer arm? (1)
6. What is the degree of freedom of a monoatomic gas? (1)
7. For an ideal gas, show the nature of
PV
nT
versus P graph, where the symbols have their
usual meaning. (1)
8. State the Kelvin-Planck statement of the second law of thermodynamics. (1)
9. Differentiate between systematic errors and random errors. (2)
10. Two blocks of mass 3 kg and 2 kg are in contact with each other on a frictionless table.
Find the force exerted by the smaller block on bigger block if a force of 5 N is applied on
the bigger block. (2)
OR
Mention two ways in which static friction is a self adjusting force. How much force of
static friction is acting on the block of mass 2 kg shown in figure below if the coefficient
of static friction between the block and the surface is 0.2? (2)
11. The kinetic energy of a body is increased by 21%. What is the percentage increase in
the linear momentum of the body? (2)
CBSE | Physics
Sample Paper 3
12. Find the magnitude and direction of angular momentum of the body of mass m (about
point O) which is moving with velocity ? as shown. (2)
13. Name the satellites which have Sun synchronous orbit. How is their orbit different from
that of the satellites used for communication purpose? What is the significance of
negative total energy of a satellite? (2)
14. Define breaking stress. A heavy wire is suspended from a roof and no weight is attached
to its lower end. Is it under stress? (2)
15. Calculate the fall in pressure of helium initially at 1600 P a, when it is suddenly
expended to 8 times its original volume. Given ? =
5
3
. (2)
16. What is the change in internal energy of a gas during (i) isothermal expansion and (ii)
adiabatic expansion? (2)
17. On a two lane road, car A is travelling with a speed of 36 km/h. Two cars B and C
approach car A from opposite directions with speeds of 54 km/h each. At a certain
instant, when both car B and C are at a distance of 1 km from A, B decides to overtake
car A before C does. What minimum acceleration of B is required to avert an accident?
(3)
18. A particle of mass m moves in a straight line with retardation proportional to its
displacement. Find the expression for loss of kinetic energy for any displacement x. (3)
CBSE | Physics
Sample Paper 3
19. Give reasons for the following:
(a) A load on a thief’s back does not apply any force on him when he jumps from the
upper story of a house.
(b) A gun recoils on being fired.
(c) A man falling from a height receives more injury when he falls on cemented floor
rather than when he falls on a heap of sand. (3)
20. A cubical ice box of thermocole has each side 30 cm long and a thickness of 5 cm. 4 kg of
ice is put in the box. If outside temperature is 45°C and the coefficient of thermal
conductivity is 0.01 J/S/m/°C, calculate the mass of ice left after 6 hours. Latent heat of
fusion of ice = 335 × 10
3
J/kg. (3)
21. Three equal masses of m kg each are fixed at the vertices of an equilateral triangle ABC.
What is the force acting on mass 2 m placed at the centroid P of the triangle? Take AP =
BP = CP = 1 m. (3)
22. A tank of volume 0.3 m
3
contains 2 moles of helium gas at 20°C. Assuming that helium
behaves like an ideal gas.
(a) Find the total thermal energy of the system.
(b) What is the average kinetic energy per molecule? (3)
OR
Nine particles of a gas have speeds of 5.00, 8.00, 12.00, 12.00, 12.00, 14.00, 14.00, 17.00
and 20.00 m/s.
(a) Find the average speed.
(b) What is the rms speed?
(c) What is the most probable speed of the particles? (3)
23.
(a) Which characteristic of a wave remains constant as it moves from one medium to
another and why?
(b) The phase difference between two points on a progressive wave is
3
4
?
. What will be
the corresponding path difference?
(c) Mention one condition for production of beats. (3)
Page 5
CBSE | Physics
Sample Paper 3
CBSE Board
Class XI Physics
Sample Paper-3
Time: - 3 Marks: - 70 Marks
General Instructions
(a) All questions are compulsory.
(b) There are 29 questions in total. Questions 1 to 8 carry one mark each, questions 9 to
16 carry two marks each, questions 17 to 25 carry three marks each and questions
27 to 29 carry five marks each.
(c) Question 26 is a value based question carrying four marks.
(d) There is no overall choice. However, an internal choice has been provided in one
question of two marks, one question of three marks and all three questions of five
marks each. You have to attempt only one of the given choices in such questions.
(e) Use of calculator is not permitted.
(f) You may use the following physical constants wherever necessary.
19
81
34
72
23 1
23
27
1.6 10
3 10
6.6 10
4 10
1.38 10
6.023 10 /
1.6 10
o
B
A
n
N
eC
c ms
h JS
A
k JK
N mole
m kg
??
?
?
?
??
?
?
??
??
??
??
??
??
??
1. Can a physical quantity have units but still be dimensionless? (1)
2. Give an example to show that the direction of velocity of a body can change even when
its acceleration is constant. (1)
3. Two vectors A and B are directed along y-axis and z-axis respectively. What is the
direction of the vector ? (B A) ? (1)
CBSE | Physics
Sample Paper 3
4. What does the area of the shaded portion of the graph represent? (1)
5. Why do we prefer to use a wrench (spanner) of longer arm? (1)
6. What is the degree of freedom of a monoatomic gas? (1)
7. For an ideal gas, show the nature of
PV
nT
versus P graph, where the symbols have their
usual meaning. (1)
8. State the Kelvin-Planck statement of the second law of thermodynamics. (1)
9. Differentiate between systematic errors and random errors. (2)
10. Two blocks of mass 3 kg and 2 kg are in contact with each other on a frictionless table.
Find the force exerted by the smaller block on bigger block if a force of 5 N is applied on
the bigger block. (2)
OR
Mention two ways in which static friction is a self adjusting force. How much force of
static friction is acting on the block of mass 2 kg shown in figure below if the coefficient
of static friction between the block and the surface is 0.2? (2)
11. The kinetic energy of a body is increased by 21%. What is the percentage increase in
the linear momentum of the body? (2)
CBSE | Physics
Sample Paper 3
12. Find the magnitude and direction of angular momentum of the body of mass m (about
point O) which is moving with velocity ? as shown. (2)
13. Name the satellites which have Sun synchronous orbit. How is their orbit different from
that of the satellites used for communication purpose? What is the significance of
negative total energy of a satellite? (2)
14. Define breaking stress. A heavy wire is suspended from a roof and no weight is attached
to its lower end. Is it under stress? (2)
15. Calculate the fall in pressure of helium initially at 1600 P a, when it is suddenly
expended to 8 times its original volume. Given ? =
5
3
. (2)
16. What is the change in internal energy of a gas during (i) isothermal expansion and (ii)
adiabatic expansion? (2)
17. On a two lane road, car A is travelling with a speed of 36 km/h. Two cars B and C
approach car A from opposite directions with speeds of 54 km/h each. At a certain
instant, when both car B and C are at a distance of 1 km from A, B decides to overtake
car A before C does. What minimum acceleration of B is required to avert an accident?
(3)
18. A particle of mass m moves in a straight line with retardation proportional to its
displacement. Find the expression for loss of kinetic energy for any displacement x. (3)
CBSE | Physics
Sample Paper 3
19. Give reasons for the following:
(a) A load on a thief’s back does not apply any force on him when he jumps from the
upper story of a house.
(b) A gun recoils on being fired.
(c) A man falling from a height receives more injury when he falls on cemented floor
rather than when he falls on a heap of sand. (3)
20. A cubical ice box of thermocole has each side 30 cm long and a thickness of 5 cm. 4 kg of
ice is put in the box. If outside temperature is 45°C and the coefficient of thermal
conductivity is 0.01 J/S/m/°C, calculate the mass of ice left after 6 hours. Latent heat of
fusion of ice = 335 × 10
3
J/kg. (3)
21. Three equal masses of m kg each are fixed at the vertices of an equilateral triangle ABC.
What is the force acting on mass 2 m placed at the centroid P of the triangle? Take AP =
BP = CP = 1 m. (3)
22. A tank of volume 0.3 m
3
contains 2 moles of helium gas at 20°C. Assuming that helium
behaves like an ideal gas.
(a) Find the total thermal energy of the system.
(b) What is the average kinetic energy per molecule? (3)
OR
Nine particles of a gas have speeds of 5.00, 8.00, 12.00, 12.00, 12.00, 14.00, 14.00, 17.00
and 20.00 m/s.
(a) Find the average speed.
(b) What is the rms speed?
(c) What is the most probable speed of the particles? (3)
23.
(a) Which characteristic of a wave remains constant as it moves from one medium to
another and why?
(b) The phase difference between two points on a progressive wave is
3
4
?
. What will be
the corresponding path difference?
(c) Mention one condition for production of beats. (3)
CBSE | Physics
Sample Paper 3
24. Two identical springs of spring constant k are attached to a block of mass m and to fixed
supports as shown below.
Show that the mass executes simple harmonic motion when displaced from its rest
position on either side. Also, find the period of oscillations. (3)
25.
(a) Does the first law of thermodynamics violate the law of conservation of energy?
(b) Write the limitations of the first law of thermodynamics. (3)
26. Radha found the wheel getting detached from her uncle’s car. She took it to workshop
and got it repaired. She informed her uncle, who is a mechanical engineer, about this
matter.
(a) What according to you the values displayed by Radha?
(b) A thin wheel can stay upright on its rim for a considerable length of time when
rolled with a considerable velocity, while it falls from its upright position at the
slightest disturbance, when stationary. Explain. (4)
27. The displacement of a body is given to be proportional to the cube of time elapsed.
What is the nature of the acceleration of the body? Justify your answer.
A car accelerates from rest at a constant rate of ? for some time; after which it
decelerates at constant rate of ? to come to rest. If the total time elapsed is T second.
(a) Draw a velocity time graph for the motion.
(b) Calculate maximum velocity attained in terms of ? ? ? ? and T. (5)
OR
(a) From the top of a building a ball is dropped while another is projected horizontally
at the same time.
(i) Which ball will strike the ground first?
(ii) Which will strike the ground with more speed? Justify your answer in each case.
(b) A body is projected with speed u at an angle ? to the horizontal to have maximum
range. What is the velocity at the highest point?
(c) What is the angle of projection of a projectile motion whose range R is n times the
maximum height. (5)
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