ICSE Class 10 Physics Sample Paper 2025 - 2 | Physics Class 10 ICSE PDF Download

 Page 1


Time Allowed: 2 hours Maximum Marks: 80 
General Instructions:
Answers to this Paper must be written on the paper provided separately.
You will not be allowed to write during first 15 minutes. This time is to be spent in reading the question paper.
The time given at the head of this Paper is the time allowed for writing the answers.
Section A is compulsory. Attempt any four questions from Section B.
The intended marks for questions or parts of questions are given in brackets [ ].
Section A
1. Choose the correct answers to the questions from the given options. (Do not copy the question, write the
correct answers only.)
[15]
a) Weight b) Moment of inertia
c) Angular momentum d) Torque
Force in linear motion has its analogue in rotational motion? [1] (a)
a) the diverging power decreases b) the converging power decreases
c) the converging power increases d) the diverging power increases
If two convex lenses are in contact with each other. [1] (b)
a) first changes to light energy and then to
heat energy
b) directly changes to heat energy
c) directly changes to light energy d) first changes to heat energy and then to
light energy
When a flash light is switched on the electric energy [1] (c)
a) X-rays b) -particles
c) -radiation d) -particles
Which of the following radiation gets deflected most in electric or magnetic field? [1] (d)
ß ? a a) Both A and R are true and R is the
correct explanation of A.
b) Both A and R are true but R is not the
correct explanation of A.
c) A is true but R is false. d) A is false but R is true.
Assertion (A): A duster lying on the table is an example of static equilibrium. 
Reason (R): When a body remains in the same state of motion under the influence of several forces
then the body is in static equilibrium. 
[1] (e)
Physics
Page 2


Time Allowed: 2 hours Maximum Marks: 80 
General Instructions:
Answers to this Paper must be written on the paper provided separately.
You will not be allowed to write during first 15 minutes. This time is to be spent in reading the question paper.
The time given at the head of this Paper is the time allowed for writing the answers.
Section A is compulsory. Attempt any four questions from Section B.
The intended marks for questions or parts of questions are given in brackets [ ].
Section A
1. Choose the correct answers to the questions from the given options. (Do not copy the question, write the
correct answers only.)
[15]
a) Weight b) Moment of inertia
c) Angular momentum d) Torque
Force in linear motion has its analogue in rotational motion? [1] (a)
a) the diverging power decreases b) the converging power decreases
c) the converging power increases d) the diverging power increases
If two convex lenses are in contact with each other. [1] (b)
a) first changes to light energy and then to
heat energy
b) directly changes to heat energy
c) directly changes to light energy d) first changes to heat energy and then to
light energy
When a flash light is switched on the electric energy [1] (c)
a) X-rays b) -particles
c) -radiation d) -particles
Which of the following radiation gets deflected most in electric or magnetic field? [1] (d)
ß ? a a) Both A and R are true and R is the
correct explanation of A.
b) Both A and R are true but R is not the
correct explanation of A.
c) A is true but R is false. d) A is false but R is true.
Assertion (A): A duster lying on the table is an example of static equilibrium. 
Reason (R): When a body remains in the same state of motion under the influence of several forces
then the body is in static equilibrium. 
[1] (e)
Physics
a)
60
o b)
180
o
c)
both 90
o
 and 180
o d)
90
o
An isosceles totally reflecting prism can reflect rays through an angle of: [1] (f)
a) 334.2 m b) 434.2 m
c) 234.2 m d) 134.2 m
A man stands in between two cliffs, such that he is at a distance of 133.6 m from nearer cliff. He fires
a gun and hears first echo after 0.8 s and second echo after 1.8 s. Calculate: (i) speed of sound (ii)
distance between two cliffs.
[1] (g)
a) reflection of sound waves b) absence of other sounds
c) refraction of sound waves d) clear perception of hearing
During night, distant sounds such as that of the traffic and the loudspeakers become louder than
during day. This is due to
[1] (h)
a) Position of voltmeter is incorrect b) Terminals of ammeter are wrongly
connected
c) Terminals of voltmeter are wrongly
connected
d) Position of ammeter is incorrect
To determine the equivalent resistance of two resistors when connected in series, a student arranged
the circuit components as shown in the diagram. But he did not succeed to achieve the objective. 
Which of the following mistakes has been committed by him in setting up the circuit?
[1] (i)
a) increasing the area of cross-section of
the coil
b) increasing the strength of field magnets
c) increasing number of turns in the coil d) all of these
In an a.c. generator the magnitude of induced current can be increased by: [1] (j)
a) 40 N b) 80 N
c) 5 N d) 10 N
A door is 1 m wide. It can be closed by an effort of 25 N, when effort is applied at a distance of 0.4 m
from the hinge. What effort is needed, if it is applied at its extreme end?
[1] (k)
a) increase in agricultural production b) increase in the level of sea water
c) decrease in disease caused by bacteria d) decrease in the level of sea water
Global warming will result in: [1] (l)
a) 225 g b) 325 g
c) 125 g d) 25 g
What mass of a solid of specific heat capacity 0.75 Jg
-1 o
C
-1
 will have heat capacity 93.75 Jg
-1
 
o
C
-1
?
[1] (m)
Page 3


Time Allowed: 2 hours Maximum Marks: 80 
General Instructions:
Answers to this Paper must be written on the paper provided separately.
You will not be allowed to write during first 15 minutes. This time is to be spent in reading the question paper.
The time given at the head of this Paper is the time allowed for writing the answers.
Section A is compulsory. Attempt any four questions from Section B.
The intended marks for questions or parts of questions are given in brackets [ ].
Section A
1. Choose the correct answers to the questions from the given options. (Do not copy the question, write the
correct answers only.)
[15]
a) Weight b) Moment of inertia
c) Angular momentum d) Torque
Force in linear motion has its analogue in rotational motion? [1] (a)
a) the diverging power decreases b) the converging power decreases
c) the converging power increases d) the diverging power increases
If two convex lenses are in contact with each other. [1] (b)
a) first changes to light energy and then to
heat energy
b) directly changes to heat energy
c) directly changes to light energy d) first changes to heat energy and then to
light energy
When a flash light is switched on the electric energy [1] (c)
a) X-rays b) -particles
c) -radiation d) -particles
Which of the following radiation gets deflected most in electric or magnetic field? [1] (d)
ß ? a a) Both A and R are true and R is the
correct explanation of A.
b) Both A and R are true but R is not the
correct explanation of A.
c) A is true but R is false. d) A is false but R is true.
Assertion (A): A duster lying on the table is an example of static equilibrium. 
Reason (R): When a body remains in the same state of motion under the influence of several forces
then the body is in static equilibrium. 
[1] (e)
Physics
a)
60
o b)
180
o
c)
both 90
o
 and 180
o d)
90
o
An isosceles totally reflecting prism can reflect rays through an angle of: [1] (f)
a) 334.2 m b) 434.2 m
c) 234.2 m d) 134.2 m
A man stands in between two cliffs, such that he is at a distance of 133.6 m from nearer cliff. He fires
a gun and hears first echo after 0.8 s and second echo after 1.8 s. Calculate: (i) speed of sound (ii)
distance between two cliffs.
[1] (g)
a) reflection of sound waves b) absence of other sounds
c) refraction of sound waves d) clear perception of hearing
During night, distant sounds such as that of the traffic and the loudspeakers become louder than
during day. This is due to
[1] (h)
a) Position of voltmeter is incorrect b) Terminals of ammeter are wrongly
connected
c) Terminals of voltmeter are wrongly
connected
d) Position of ammeter is incorrect
To determine the equivalent resistance of two resistors when connected in series, a student arranged
the circuit components as shown in the diagram. But he did not succeed to achieve the objective. 
Which of the following mistakes has been committed by him in setting up the circuit?
[1] (i)
a) increasing the area of cross-section of
the coil
b) increasing the strength of field magnets
c) increasing number of turns in the coil d) all of these
In an a.c. generator the magnitude of induced current can be increased by: [1] (j)
a) 40 N b) 80 N
c) 5 N d) 10 N
A door is 1 m wide. It can be closed by an effort of 25 N, when effort is applied at a distance of 0.4 m
from the hinge. What effort is needed, if it is applied at its extreme end?
[1] (k)
a) increase in agricultural production b) increase in the level of sea water
c) decrease in disease caused by bacteria d) decrease in the level of sea water
Global warming will result in: [1] (l)
a) 225 g b) 325 g
c) 125 g d) 25 g
What mass of a solid of specific heat capacity 0.75 Jg
-1 o
C
-1
 will have heat capacity 93.75 Jg
-1
 
o
C
-1
?
[1] (m)
a) two rectangular and three triangular
surfaces
b) four rectangular and three triangular
surfaces
c) two triangular and three rectangular
surfaces
d) three rectangular and three triangular
surfaces
A prism has: [1] (n)
a) water b) cold air
c) diamond d) glass
The highest refractive index is of: [1] (o)
2. Answer the following questions: [15]
i. If a machine is used to lift a load of 50 N such that resistance due to friction and movable part
of machine is 15 N, then the total lifted load is 65 N, i.e., (50 + 15) N. If the displacement is
caused through 2 m, then find actual and useful output.
[1]
ii. Why is a jack screw provided with a long arm? [1]
iii. Considering that simple physical balance can work as an ideal lever, what can be said about its
mechanical advantage?
[1]
(a)
One end of a spring is kept fixed while the other end is stretched by a force as shown in the diagram 
i. Copy the diagram and mark on it the direction of the restoring force.
ii. Name the instrument.
[2] (b)
To use a machine as a force multiplier, what type (class) of lever should preferably be used? Draw a
sketch of such a lever.
[2] (c)
i. Define one Newton.
ii. Write the relation between S.I. unit and C.G.S. unit of force.
[2] (d)
A body of mass 5 kg is moving with a velocity of 10 m/s. What will be the ratio of its initial kinetic
energy and final kinetic energy, if the mass of the body is doubled and its velocity is halved?
[2] (e)
What are the factors on which resistance of a conductor depends? [2] (f)
i. Name the system which enables us to locate underwater objects by transmitting ultrasonic waves
and detecting the reflecting impulse,
ii. What are acoustically measurable quantities related to pitch and loudness?
[2] (g)
3. Answer the following questions; [10]
Define the power of a lens. Write its formula expression and its SI unit. [2] (a)
Find the resistance between points A and B. [2] (b)
Calculate the equivalent resistance between P and Q from the following diagram. [2] (c)
Page 4


Time Allowed: 2 hours Maximum Marks: 80 
General Instructions:
Answers to this Paper must be written on the paper provided separately.
You will not be allowed to write during first 15 minutes. This time is to be spent in reading the question paper.
The time given at the head of this Paper is the time allowed for writing the answers.
Section A is compulsory. Attempt any four questions from Section B.
The intended marks for questions or parts of questions are given in brackets [ ].
Section A
1. Choose the correct answers to the questions from the given options. (Do not copy the question, write the
correct answers only.)
[15]
a) Weight b) Moment of inertia
c) Angular momentum d) Torque
Force in linear motion has its analogue in rotational motion? [1] (a)
a) the diverging power decreases b) the converging power decreases
c) the converging power increases d) the diverging power increases
If two convex lenses are in contact with each other. [1] (b)
a) first changes to light energy and then to
heat energy
b) directly changes to heat energy
c) directly changes to light energy d) first changes to heat energy and then to
light energy
When a flash light is switched on the electric energy [1] (c)
a) X-rays b) -particles
c) -radiation d) -particles
Which of the following radiation gets deflected most in electric or magnetic field? [1] (d)
ß ? a a) Both A and R are true and R is the
correct explanation of A.
b) Both A and R are true but R is not the
correct explanation of A.
c) A is true but R is false. d) A is false but R is true.
Assertion (A): A duster lying on the table is an example of static equilibrium. 
Reason (R): When a body remains in the same state of motion under the influence of several forces
then the body is in static equilibrium. 
[1] (e)
Physics
a)
60
o b)
180
o
c)
both 90
o
 and 180
o d)
90
o
An isosceles totally reflecting prism can reflect rays through an angle of: [1] (f)
a) 334.2 m b) 434.2 m
c) 234.2 m d) 134.2 m
A man stands in between two cliffs, such that he is at a distance of 133.6 m from nearer cliff. He fires
a gun and hears first echo after 0.8 s and second echo after 1.8 s. Calculate: (i) speed of sound (ii)
distance between two cliffs.
[1] (g)
a) reflection of sound waves b) absence of other sounds
c) refraction of sound waves d) clear perception of hearing
During night, distant sounds such as that of the traffic and the loudspeakers become louder than
during day. This is due to
[1] (h)
a) Position of voltmeter is incorrect b) Terminals of ammeter are wrongly
connected
c) Terminals of voltmeter are wrongly
connected
d) Position of ammeter is incorrect
To determine the equivalent resistance of two resistors when connected in series, a student arranged
the circuit components as shown in the diagram. But he did not succeed to achieve the objective. 
Which of the following mistakes has been committed by him in setting up the circuit?
[1] (i)
a) increasing the area of cross-section of
the coil
b) increasing the strength of field magnets
c) increasing number of turns in the coil d) all of these
In an a.c. generator the magnitude of induced current can be increased by: [1] (j)
a) 40 N b) 80 N
c) 5 N d) 10 N
A door is 1 m wide. It can be closed by an effort of 25 N, when effort is applied at a distance of 0.4 m
from the hinge. What effort is needed, if it is applied at its extreme end?
[1] (k)
a) increase in agricultural production b) increase in the level of sea water
c) decrease in disease caused by bacteria d) decrease in the level of sea water
Global warming will result in: [1] (l)
a) 225 g b) 325 g
c) 125 g d) 25 g
What mass of a solid of specific heat capacity 0.75 Jg
-1 o
C
-1
 will have heat capacity 93.75 Jg
-1
 
o
C
-1
?
[1] (m)
a) two rectangular and three triangular
surfaces
b) four rectangular and three triangular
surfaces
c) two triangular and three rectangular
surfaces
d) three rectangular and three triangular
surfaces
A prism has: [1] (n)
a) water b) cold air
c) diamond d) glass
The highest refractive index is of: [1] (o)
2. Answer the following questions: [15]
i. If a machine is used to lift a load of 50 N such that resistance due to friction and movable part
of machine is 15 N, then the total lifted load is 65 N, i.e., (50 + 15) N. If the displacement is
caused through 2 m, then find actual and useful output.
[1]
ii. Why is a jack screw provided with a long arm? [1]
iii. Considering that simple physical balance can work as an ideal lever, what can be said about its
mechanical advantage?
[1]
(a)
One end of a spring is kept fixed while the other end is stretched by a force as shown in the diagram 
i. Copy the diagram and mark on it the direction of the restoring force.
ii. Name the instrument.
[2] (b)
To use a machine as a force multiplier, what type (class) of lever should preferably be used? Draw a
sketch of such a lever.
[2] (c)
i. Define one Newton.
ii. Write the relation between S.I. unit and C.G.S. unit of force.
[2] (d)
A body of mass 5 kg is moving with a velocity of 10 m/s. What will be the ratio of its initial kinetic
energy and final kinetic energy, if the mass of the body is doubled and its velocity is halved?
[2] (e)
What are the factors on which resistance of a conductor depends? [2] (f)
i. Name the system which enables us to locate underwater objects by transmitting ultrasonic waves
and detecting the reflecting impulse,
ii. What are acoustically measurable quantities related to pitch and loudness?
[2] (g)
3. Answer the following questions; [10]
Define the power of a lens. Write its formula expression and its SI unit. [2] (a)
Find the resistance between points A and B. [2] (b)
Calculate the equivalent resistance between P and Q from the following diagram. [2] (c)
Section B
Attempt any 4 questions
The specific heat capacity of a substance A is 3,800 J kg
-1
 K
-1
 and that of a substance B is 400 J kg
-1
K
-1
. Which of the two substances is a good conductor of heat? Give a reason for your answer.
[2] (d)
A radioactive nucleus undergoes a series of decays according to the sequence. 
 
If the mass number and atomic number of X
3
 are 172 and 69 respectively, what is the mass number
and atomic number of X?
[2] (e)
X ? ß X 1 ? a X 2 ? a X 3 4. Answer the following questions: [10]
A lens forms an upright and diminished image of an object when the object is placed at the focal point
of the given lens.
i. Name the lens.
ii. Draw a ray diagram to show the image formation.
[3] (a)
i. How is the transference of heat energy by radiation prevented in a calorimeter?
ii. You have a choice of three metals A, B and C, of specific heat capacities 900 Jkg
-10
C
-1
, 380 Jkg
-1
o
C
-1
 and 460 Jkg
-10 
°C
-1
 respectively, to make a calorimeter. Which material will you select?
Justify your answer.
[3] (b)
Draw a ray diagram to illustrate the action of a convergent lens as a reading lens or a magnifying
glass.
[4] (c)
5. Answer the following questions: [10]
How does the value of angle of deviation produced by a prism change with an increase in the
i. Value of angle of incidence?
ii. Wavelength of incident light?
[3] (a)
i. Explain, why in daylight an object appears red when seen through a red glass and black when seen
through a blue glass?
ii. Name the extreme colours in pure spectrum of light.
[3] (b)
A narrow beam of white light is passing through a glass prism ABC as shown in the diagram. 
Trace it on your answer sheet and show the path of the emergent beam as observed on the screen DE.
i. Write the name and cause of the phenomenon observed.
ii. Where else in nature is this phenomenon observed?
iii. Based on this observation state the conclusion which can be drawn about the constituents of white
light.
[4] (c)
6. Answer the following questions: [10]
A load M = 200 kg is supported in two different ways shown in the given figure. F
1
 and F
2
 are the
forces needed in two cases. Calculate . 
[3] (a)
F 1 F 2
Page 5


Time Allowed: 2 hours Maximum Marks: 80 
General Instructions:
Answers to this Paper must be written on the paper provided separately.
You will not be allowed to write during first 15 minutes. This time is to be spent in reading the question paper.
The time given at the head of this Paper is the time allowed for writing the answers.
Section A is compulsory. Attempt any four questions from Section B.
The intended marks for questions or parts of questions are given in brackets [ ].
Section A
1. Choose the correct answers to the questions from the given options. (Do not copy the question, write the
correct answers only.)
[15]
a) Weight b) Moment of inertia
c) Angular momentum d) Torque
Force in linear motion has its analogue in rotational motion? [1] (a)
a) the diverging power decreases b) the converging power decreases
c) the converging power increases d) the diverging power increases
If two convex lenses are in contact with each other. [1] (b)
a) first changes to light energy and then to
heat energy
b) directly changes to heat energy
c) directly changes to light energy d) first changes to heat energy and then to
light energy
When a flash light is switched on the electric energy [1] (c)
a) X-rays b) -particles
c) -radiation d) -particles
Which of the following radiation gets deflected most in electric or magnetic field? [1] (d)
ß ? a a) Both A and R are true and R is the
correct explanation of A.
b) Both A and R are true but R is not the
correct explanation of A.
c) A is true but R is false. d) A is false but R is true.
Assertion (A): A duster lying on the table is an example of static equilibrium. 
Reason (R): When a body remains in the same state of motion under the influence of several forces
then the body is in static equilibrium. 
[1] (e)
Physics
a)
60
o b)
180
o
c)
both 90
o
 and 180
o d)
90
o
An isosceles totally reflecting prism can reflect rays through an angle of: [1] (f)
a) 334.2 m b) 434.2 m
c) 234.2 m d) 134.2 m
A man stands in between two cliffs, such that he is at a distance of 133.6 m from nearer cliff. He fires
a gun and hears first echo after 0.8 s and second echo after 1.8 s. Calculate: (i) speed of sound (ii)
distance between two cliffs.
[1] (g)
a) reflection of sound waves b) absence of other sounds
c) refraction of sound waves d) clear perception of hearing
During night, distant sounds such as that of the traffic and the loudspeakers become louder than
during day. This is due to
[1] (h)
a) Position of voltmeter is incorrect b) Terminals of ammeter are wrongly
connected
c) Terminals of voltmeter are wrongly
connected
d) Position of ammeter is incorrect
To determine the equivalent resistance of two resistors when connected in series, a student arranged
the circuit components as shown in the diagram. But he did not succeed to achieve the objective. 
Which of the following mistakes has been committed by him in setting up the circuit?
[1] (i)
a) increasing the area of cross-section of
the coil
b) increasing the strength of field magnets
c) increasing number of turns in the coil d) all of these
In an a.c. generator the magnitude of induced current can be increased by: [1] (j)
a) 40 N b) 80 N
c) 5 N d) 10 N
A door is 1 m wide. It can be closed by an effort of 25 N, when effort is applied at a distance of 0.4 m
from the hinge. What effort is needed, if it is applied at its extreme end?
[1] (k)
a) increase in agricultural production b) increase in the level of sea water
c) decrease in disease caused by bacteria d) decrease in the level of sea water
Global warming will result in: [1] (l)
a) 225 g b) 325 g
c) 125 g d) 25 g
What mass of a solid of specific heat capacity 0.75 Jg
-1 o
C
-1
 will have heat capacity 93.75 Jg
-1
 
o
C
-1
?
[1] (m)
a) two rectangular and three triangular
surfaces
b) four rectangular and three triangular
surfaces
c) two triangular and three rectangular
surfaces
d) three rectangular and three triangular
surfaces
A prism has: [1] (n)
a) water b) cold air
c) diamond d) glass
The highest refractive index is of: [1] (o)
2. Answer the following questions: [15]
i. If a machine is used to lift a load of 50 N such that resistance due to friction and movable part
of machine is 15 N, then the total lifted load is 65 N, i.e., (50 + 15) N. If the displacement is
caused through 2 m, then find actual and useful output.
[1]
ii. Why is a jack screw provided with a long arm? [1]
iii. Considering that simple physical balance can work as an ideal lever, what can be said about its
mechanical advantage?
[1]
(a)
One end of a spring is kept fixed while the other end is stretched by a force as shown in the diagram 
i. Copy the diagram and mark on it the direction of the restoring force.
ii. Name the instrument.
[2] (b)
To use a machine as a force multiplier, what type (class) of lever should preferably be used? Draw a
sketch of such a lever.
[2] (c)
i. Define one Newton.
ii. Write the relation between S.I. unit and C.G.S. unit of force.
[2] (d)
A body of mass 5 kg is moving with a velocity of 10 m/s. What will be the ratio of its initial kinetic
energy and final kinetic energy, if the mass of the body is doubled and its velocity is halved?
[2] (e)
What are the factors on which resistance of a conductor depends? [2] (f)
i. Name the system which enables us to locate underwater objects by transmitting ultrasonic waves
and detecting the reflecting impulse,
ii. What are acoustically measurable quantities related to pitch and loudness?
[2] (g)
3. Answer the following questions; [10]
Define the power of a lens. Write its formula expression and its SI unit. [2] (a)
Find the resistance between points A and B. [2] (b)
Calculate the equivalent resistance between P and Q from the following diagram. [2] (c)
Section B
Attempt any 4 questions
The specific heat capacity of a substance A is 3,800 J kg
-1
 K
-1
 and that of a substance B is 400 J kg
-1
K
-1
. Which of the two substances is a good conductor of heat? Give a reason for your answer.
[2] (d)
A radioactive nucleus undergoes a series of decays according to the sequence. 
 
If the mass number and atomic number of X
3
 are 172 and 69 respectively, what is the mass number
and atomic number of X?
[2] (e)
X ? ß X 1 ? a X 2 ? a X 3 4. Answer the following questions: [10]
A lens forms an upright and diminished image of an object when the object is placed at the focal point
of the given lens.
i. Name the lens.
ii. Draw a ray diagram to show the image formation.
[3] (a)
i. How is the transference of heat energy by radiation prevented in a calorimeter?
ii. You have a choice of three metals A, B and C, of specific heat capacities 900 Jkg
-10
C
-1
, 380 Jkg
-1
o
C
-1
 and 460 Jkg
-10 
°C
-1
 respectively, to make a calorimeter. Which material will you select?
Justify your answer.
[3] (b)
Draw a ray diagram to illustrate the action of a convergent lens as a reading lens or a magnifying
glass.
[4] (c)
5. Answer the following questions: [10]
How does the value of angle of deviation produced by a prism change with an increase in the
i. Value of angle of incidence?
ii. Wavelength of incident light?
[3] (a)
i. Explain, why in daylight an object appears red when seen through a red glass and black when seen
through a blue glass?
ii. Name the extreme colours in pure spectrum of light.
[3] (b)
A narrow beam of white light is passing through a glass prism ABC as shown in the diagram. 
Trace it on your answer sheet and show the path of the emergent beam as observed on the screen DE.
i. Write the name and cause of the phenomenon observed.
ii. Where else in nature is this phenomenon observed?
iii. Based on this observation state the conclusion which can be drawn about the constituents of white
light.
[4] (c)
6. Answer the following questions: [10]
A load M = 200 kg is supported in two different ways shown in the given figure. F
1
 and F
2
 are the
forces needed in two cases. Calculate . 
[3] (a)
F 1 F 2 
A uniform meter scale is in equilibrium as shown in the diagram: 
i. Calculate the weight of the meter scale.
ii. Which of the following options is correct to keep the ruler in equilibrium when 40 gf wt is shifted
to 0 cm mark? F is shifted towards 0 cm. or F is shifted to wards 100 cm.
[3] (b)
In each of the following a force, F is acting on an object of mass m. The direction of displacement is
from West to East shown by the longer arrow. Observe the diagrams carefully and state whether the
work done by the force is negative, positive or zero. 
[4] (c)
7. Answer the following questions: [10]
A rear view mirror of motorbike starts vibrating violently at some particular speed of motorbike.
i. Why does this happen?
ii. What is the name of the phenomenon taking place?
iii. What could be done to stop the violent vibrations?
[3] (a)
i. When does the nucleus of an atom tend to be radioactive?
ii. How is the radioactivity of an element affected, when it undergoes a chemical change to form a
chemical compound?
iii. Mention one use and one harmful effect of radioactivity.
[3] (b)
Two pendulums C and D are suspended from a wire as shown in the figure given below. Pendulum C
is made to oscillate by displacing it from its mean position. It is seen that D also starts oscillating. 
i. Name the type of oscillation, C will execute.
ii. Name the type of oscillation, D will execute.
iii. If the length of D is made equal to C, then what difference will you notice in the oscillations of D?
iv. What is the name of the phenomenon when the length of D is made equal to C?
[4] (c)
8. Answer the following questions: [10]
i. Write an expression for the electrical energy spent in the flow of current through an electrical
appliance in terms of I, R and t.
ii. At what voltage is the alternating current supplied to our houses?
[3] (a)