ICSE Class 10 Physics Sample Paper 2025 - 5 | 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) b)
c) d)
A particle of mass m is executing a uniform circular motion on a path of radius r. If p is the magnitude
of its linear momentum, then what is the radial force acting on the particle?
[1] (a)
p m r m p 2 r p p 2 m r a) may see a rainbow as concentric circles b) may see a rainbow as concentric arcs
c) may see a rainbow as straight bands d) never see a rainbow
A passenger in an aeroplane will [1] (b)
a) 52.45 H.P. b) 218.83 H.P.
c) 165.33 H.P. d) 355.55 H.P.
Calculate the power of an electric pump in horse power, which can lift 2000 m
3
 of water from a depth
of 20 m in 25 minutes. [Take g = 10 ms
-2
 and 1 m
3
 of water = 10
3
 kg]
[1] (c)
a) the mass number and atomic number
decrease by 1 amu.
b) the mass number remains unchanged,
but atomic number decreases by 1 amu.
c) the mass number increases by 1 amu,
but atomic number remains same.
d) the mass number remains unchanged,
but atomic number increases by 1 amu.
During -emmision: [1] (d) ß a) Both A and R are true and R is the b) Both A and R are true but R is not the
Assertion (A): The moment of force depends upon magnitude of the force applied and the
perpendicular distance of the line of action of force from the axis of rotation. 
Reason (R): The opening and shutting of the door is possible due to the moment of force. 
[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) b)
c) d)
A particle of mass m is executing a uniform circular motion on a path of radius r. If p is the magnitude
of its linear momentum, then what is the radial force acting on the particle?
[1] (a)
p m r m p 2 r p p 2 m r a) may see a rainbow as concentric circles b) may see a rainbow as concentric arcs
c) may see a rainbow as straight bands d) never see a rainbow
A passenger in an aeroplane will [1] (b)
a) 52.45 H.P. b) 218.83 H.P.
c) 165.33 H.P. d) 355.55 H.P.
Calculate the power of an electric pump in horse power, which can lift 2000 m
3
 of water from a depth
of 20 m in 25 minutes. [Take g = 10 ms
-2
 and 1 m
3
 of water = 10
3
 kg]
[1] (c)
a) the mass number and atomic number
decrease by 1 amu.
b) the mass number remains unchanged,
but atomic number decreases by 1 amu.
c) the mass number increases by 1 amu,
but atomic number remains same.
d) the mass number remains unchanged,
but atomic number increases by 1 amu.
During -emmision: [1] (d) ß a) Both A and R are true and R is the b) Both A and R are true but R is not the
Assertion (A): The moment of force depends upon magnitude of the force applied and the
perpendicular distance of the line of action of force from the axis of rotation. 
Reason (R): The opening and shutting of the door is possible due to the moment of force. 
[1] (e)
Physics
correct explanation of A. correct explanation of A.
c) A is true but R is false. d) Both A and R are true.
a) b)
c) d)
Which amongst the given figures below correctly depicts the dispersion of white light by a glass
prism?
[1] (f)
a) 4.0 sec b) 2.0 sec
c) 1.0 sec d) 3.0 sec
A person fires a gun in front of a building 167 m away. If the speed of sound is 334 ms
-1
, calculate
time in which he hears an echo.
[1] (g)
a) speed b) waveform
c) frequency d) wavelength
Two notes are produced from a flute and piano, such that they have same loudness and same pitch.
The notes so 
produced differ in their:
[1] (h)
a) Both R
1
 and V b) Both R
2
 and V
c) Both R
1
 and R
2
d) R
1
, R
2
 and V
For the given circuit, name the components which are connected in parallel. [1] (i)
a) decreases in strength b) get reversed in direction
c) remains unchanged in strength and
direction
d) increases in strength
On reversing the direction of current in a wire the magnetic field produced by it [1] (j)
a) more than 5 b) less than 5
c) both 5 and less than 5 d) 5
A pulley system has 5 pulley in all. Its velocity ratio is: [1] (k)
A solid of mass 150 g at 200
o
C is placed in 0.4 kg of water at 20
o
C till a constant temperature is
attained. If the S.H.C. of the solid is 0.5 Jg
-1
 K
-1
, find the resulting temperature of the mixture.
[1] (l)
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) b)
c) d)
A particle of mass m is executing a uniform circular motion on a path of radius r. If p is the magnitude
of its linear momentum, then what is the radial force acting on the particle?
[1] (a)
p m r m p 2 r p p 2 m r a) may see a rainbow as concentric circles b) may see a rainbow as concentric arcs
c) may see a rainbow as straight bands d) never see a rainbow
A passenger in an aeroplane will [1] (b)
a) 52.45 H.P. b) 218.83 H.P.
c) 165.33 H.P. d) 355.55 H.P.
Calculate the power of an electric pump in horse power, which can lift 2000 m
3
 of water from a depth
of 20 m in 25 minutes. [Take g = 10 ms
-2
 and 1 m
3
 of water = 10
3
 kg]
[1] (c)
a) the mass number and atomic number
decrease by 1 amu.
b) the mass number remains unchanged,
but atomic number decreases by 1 amu.
c) the mass number increases by 1 amu,
but atomic number remains same.
d) the mass number remains unchanged,
but atomic number increases by 1 amu.
During -emmision: [1] (d) ß a) Both A and R are true and R is the b) Both A and R are true but R is not the
Assertion (A): The moment of force depends upon magnitude of the force applied and the
perpendicular distance of the line of action of force from the axis of rotation. 
Reason (R): The opening and shutting of the door is possible due to the moment of force. 
[1] (e)
Physics
correct explanation of A. correct explanation of A.
c) A is true but R is false. d) Both A and R are true.
a) b)
c) d)
Which amongst the given figures below correctly depicts the dispersion of white light by a glass
prism?
[1] (f)
a) 4.0 sec b) 2.0 sec
c) 1.0 sec d) 3.0 sec
A person fires a gun in front of a building 167 m away. If the speed of sound is 334 ms
-1
, calculate
time in which he hears an echo.
[1] (g)
a) speed b) waveform
c) frequency d) wavelength
Two notes are produced from a flute and piano, such that they have same loudness and same pitch.
The notes so 
produced differ in their:
[1] (h)
a) Both R
1
 and V b) Both R
2
 and V
c) Both R
1
 and R
2
d) R
1
, R
2
 and V
For the given circuit, name the components which are connected in parallel. [1] (i)
a) decreases in strength b) get reversed in direction
c) remains unchanged in strength and
direction
d) increases in strength
On reversing the direction of current in a wire the magnetic field produced by it [1] (j)
a) more than 5 b) less than 5
c) both 5 and less than 5 d) 5
A pulley system has 5 pulley in all. Its velocity ratio is: [1] (k)
A solid of mass 150 g at 200
o
C is placed in 0.4 kg of water at 20
o
C till a constant temperature is
attained. If the S.H.C. of the solid is 0.5 Jg
-1
 K
-1
, find the resulting temperature of the mixture.
[1] (l)
a)
27.7
o
C
b)
37.7
o
C
c)
47.7
o
C
d)
57.7
o
C
a)
kJ Kg
-1 b)
Jkg
-1
 K
-1
c)
Jkg
-1 d)
cal 
o
C
-1
S.I. unit of thermal capacity is: [1] (m)
a) - 1.5 b) + 6.67
c) + 1.5 d) - 6.67
A convex lens of focal length 40 cm, a concave lens of focal length 40 cm and a concave lens of focal
length 15 cm are placed in contact. The power of the combination in dioptre is
[1] (n)
a) absorbed b) transmitted
c) refraction d) reflected
When a beam of light strikes a glass slab a part of it is: [1] (o)
2. Answer the following questions: [15]
i. What is the relationship between the mechanical advantage and the velocity ratio for ideal
machine
[1]
ii. In a single fixed pulley, if the effort moves by a distance x downwards, by what height is the
load raised upwards?
[1]
iii. A pulley system has there pulleys. A load of 120 N is overcome by applying an effort of 50 N.
Calculate the mechanical advantage?
[1]
(a)
State the direction of:
i. Centripetal force
ii. Centrifugal force
[2] (b)
A nut which can be broken by applying a force of 60 kgf, is broken by using a nut cracker having its
handle 15 cm long by placing it at a distance of 2 cm from the hinge. Calculate the minimum force
needed to break the nut.
[2] (c)
Scissors for cutting cloth have blades much longer than handles. Why? [2] (d)
A van of mass 2000 kg is travelling at 10 ms
-1
. Calculate its kinetic energy. If its speed increases to
20 ms
-1
, by how much amount does its kinetic energy increases?
[2] (e)
Find the equivalent resistance of the given network between P & Q [2] (f)
If boy fires a gun and hears its echo after 5s. The boy then moves 310 m towards the hill and fires the
gun again. This time, he hears the echo after 3s. Calculate the speed of the sound.
[2] (g)
3. Answer the following questions; [10]
Briefly mention, why does the sky at noon appear white? [2] (a)
Calculate the resistance of 1 km long copper wire of radius 1 mm. 
(Resistivity of copper is 1.72  10
-8
  m).
[2] (b)
× O If the current I through a resistor is increased by 100% (assume that temperature remains unchanged), [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) b)
c) d)
A particle of mass m is executing a uniform circular motion on a path of radius r. If p is the magnitude
of its linear momentum, then what is the radial force acting on the particle?
[1] (a)
p m r m p 2 r p p 2 m r a) may see a rainbow as concentric circles b) may see a rainbow as concentric arcs
c) may see a rainbow as straight bands d) never see a rainbow
A passenger in an aeroplane will [1] (b)
a) 52.45 H.P. b) 218.83 H.P.
c) 165.33 H.P. d) 355.55 H.P.
Calculate the power of an electric pump in horse power, which can lift 2000 m
3
 of water from a depth
of 20 m in 25 minutes. [Take g = 10 ms
-2
 and 1 m
3
 of water = 10
3
 kg]
[1] (c)
a) the mass number and atomic number
decrease by 1 amu.
b) the mass number remains unchanged,
but atomic number decreases by 1 amu.
c) the mass number increases by 1 amu,
but atomic number remains same.
d) the mass number remains unchanged,
but atomic number increases by 1 amu.
During -emmision: [1] (d) ß a) Both A and R are true and R is the b) Both A and R are true but R is not the
Assertion (A): The moment of force depends upon magnitude of the force applied and the
perpendicular distance of the line of action of force from the axis of rotation. 
Reason (R): The opening and shutting of the door is possible due to the moment of force. 
[1] (e)
Physics
correct explanation of A. correct explanation of A.
c) A is true but R is false. d) Both A and R are true.
a) b)
c) d)
Which amongst the given figures below correctly depicts the dispersion of white light by a glass
prism?
[1] (f)
a) 4.0 sec b) 2.0 sec
c) 1.0 sec d) 3.0 sec
A person fires a gun in front of a building 167 m away. If the speed of sound is 334 ms
-1
, calculate
time in which he hears an echo.
[1] (g)
a) speed b) waveform
c) frequency d) wavelength
Two notes are produced from a flute and piano, such that they have same loudness and same pitch.
The notes so 
produced differ in their:
[1] (h)
a) Both R
1
 and V b) Both R
2
 and V
c) Both R
1
 and R
2
d) R
1
, R
2
 and V
For the given circuit, name the components which are connected in parallel. [1] (i)
a) decreases in strength b) get reversed in direction
c) remains unchanged in strength and
direction
d) increases in strength
On reversing the direction of current in a wire the magnetic field produced by it [1] (j)
a) more than 5 b) less than 5
c) both 5 and less than 5 d) 5
A pulley system has 5 pulley in all. Its velocity ratio is: [1] (k)
A solid of mass 150 g at 200
o
C is placed in 0.4 kg of water at 20
o
C till a constant temperature is
attained. If the S.H.C. of the solid is 0.5 Jg
-1
 K
-1
, find the resulting temperature of the mixture.
[1] (l)
a)
27.7
o
C
b)
37.7
o
C
c)
47.7
o
C
d)
57.7
o
C
a)
kJ Kg
-1 b)
Jkg
-1
 K
-1
c)
Jkg
-1 d)
cal 
o
C
-1
S.I. unit of thermal capacity is: [1] (m)
a) - 1.5 b) + 6.67
c) + 1.5 d) - 6.67
A convex lens of focal length 40 cm, a concave lens of focal length 40 cm and a concave lens of focal
length 15 cm are placed in contact. The power of the combination in dioptre is
[1] (n)
a) absorbed b) transmitted
c) refraction d) reflected
When a beam of light strikes a glass slab a part of it is: [1] (o)
2. Answer the following questions: [15]
i. What is the relationship between the mechanical advantage and the velocity ratio for ideal
machine
[1]
ii. In a single fixed pulley, if the effort moves by a distance x downwards, by what height is the
load raised upwards?
[1]
iii. A pulley system has there pulleys. A load of 120 N is overcome by applying an effort of 50 N.
Calculate the mechanical advantage?
[1]
(a)
State the direction of:
i. Centripetal force
ii. Centrifugal force
[2] (b)
A nut which can be broken by applying a force of 60 kgf, is broken by using a nut cracker having its
handle 15 cm long by placing it at a distance of 2 cm from the hinge. Calculate the minimum force
needed to break the nut.
[2] (c)
Scissors for cutting cloth have blades much longer than handles. Why? [2] (d)
A van of mass 2000 kg is travelling at 10 ms
-1
. Calculate its kinetic energy. If its speed increases to
20 ms
-1
, by how much amount does its kinetic energy increases?
[2] (e)
Find the equivalent resistance of the given network between P & Q [2] (f)
If boy fires a gun and hears its echo after 5s. The boy then moves 310 m towards the hill and fires the
gun again. This time, he hears the echo after 3s. Calculate the speed of the sound.
[2] (g)
3. Answer the following questions; [10]
Briefly mention, why does the sky at noon appear white? [2] (a)
Calculate the resistance of 1 km long copper wire of radius 1 mm. 
(Resistivity of copper is 1.72  10
-8
  m).
[2] (b)
× O If the current I through a resistor is increased by 100% (assume that temperature remains unchanged), [2] (c)
Section B
Attempt any 4 questions
then find the increase in power dissipated.
A piece of iron of mass 100 g kept inside a furnace for a long time and then put in a calorimeter of
water equivalent 10 g containing 240 g of water at 20°C. The mixture attains an equilibrium
temperature of 60°C. Find the temperature of the furnace-specific heat of iron = 470 J/kg-K.
[2] (d)
i. Why is a nuclear fusion reaction called a thermo nuclear reaction?
ii. Complete the reaction: 
 + ________ + Energy.
[2] (e)
H e + H ? H e 3 2 2 1 4 2 4. Answer the following questions: [10]
A convex lens has a focal length of 20 cm. At what distance from the lens should the object be placed
so that the image is formed at 40 cm on the other side of the lens? Also, state the nature of the image
formed.
[3] (a)
When 8000 J of heat is given to 200 g of copper at 20
o
C, determine the final temperature, if the
specific heat capacity of copper is 0.4 Jg
-1
 
o
C
-1
.
[3] (b)
A student wants to burn a piece of paper using a convex lens in day light, rather than using match
stick or any direct flame. Will he be able to, if yes justify your answer with a ray diagram?
[4] (c)
5. Answer the following questions: [10]
i. Draw a labelled ray diagram to illustrate (a) critical angle (b) total internal reflection for a ray of
light moving from one medium to another.
ii. Write a formula to express the relationship between refractive index of the denser medium with
respect to rarer medium and its critical angle for that pair of media.
[3] (a)
A prism deviates a monochromatic ray of light through an angle , where the angle of incidence at the
surface of the prism is i.
i. Draw a graph showing the variation of  with i. On your graph, show the angle of minimum
deviation.
ii. What is the relation between the angle of incidence and the angle of emergence when the ray
suffers minimum deviation.
[3] (b) d d How can we explain the reddish appearance of the sun at sunrise or sunset? Why does it not appear
red at noon?
[4] (c)
6. Answer the following questions: [10]
A block and tackle system has the velocity ratio 4, labelled diagram of the system indicating the point
of application and the directions of load and effort is given below. A man can exert a pull of 500 N.
[3] (a)
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) b)
c) d)
A particle of mass m is executing a uniform circular motion on a path of radius r. If p is the magnitude
of its linear momentum, then what is the radial force acting on the particle?
[1] (a)
p m r m p 2 r p p 2 m r a) may see a rainbow as concentric circles b) may see a rainbow as concentric arcs
c) may see a rainbow as straight bands d) never see a rainbow
A passenger in an aeroplane will [1] (b)
a) 52.45 H.P. b) 218.83 H.P.
c) 165.33 H.P. d) 355.55 H.P.
Calculate the power of an electric pump in horse power, which can lift 2000 m
3
 of water from a depth
of 20 m in 25 minutes. [Take g = 10 ms
-2
 and 1 m
3
 of water = 10
3
 kg]
[1] (c)
a) the mass number and atomic number
decrease by 1 amu.
b) the mass number remains unchanged,
but atomic number decreases by 1 amu.
c) the mass number increases by 1 amu,
but atomic number remains same.
d) the mass number remains unchanged,
but atomic number increases by 1 amu.
During -emmision: [1] (d) ß a) Both A and R are true and R is the b) Both A and R are true but R is not the
Assertion (A): The moment of force depends upon magnitude of the force applied and the
perpendicular distance of the line of action of force from the axis of rotation. 
Reason (R): The opening and shutting of the door is possible due to the moment of force. 
[1] (e)
Physics
correct explanation of A. correct explanation of A.
c) A is true but R is false. d) Both A and R are true.
a) b)
c) d)
Which amongst the given figures below correctly depicts the dispersion of white light by a glass
prism?
[1] (f)
a) 4.0 sec b) 2.0 sec
c) 1.0 sec d) 3.0 sec
A person fires a gun in front of a building 167 m away. If the speed of sound is 334 ms
-1
, calculate
time in which he hears an echo.
[1] (g)
a) speed b) waveform
c) frequency d) wavelength
Two notes are produced from a flute and piano, such that they have same loudness and same pitch.
The notes so 
produced differ in their:
[1] (h)
a) Both R
1
 and V b) Both R
2
 and V
c) Both R
1
 and R
2
d) R
1
, R
2
 and V
For the given circuit, name the components which are connected in parallel. [1] (i)
a) decreases in strength b) get reversed in direction
c) remains unchanged in strength and
direction
d) increases in strength
On reversing the direction of current in a wire the magnetic field produced by it [1] (j)
a) more than 5 b) less than 5
c) both 5 and less than 5 d) 5
A pulley system has 5 pulley in all. Its velocity ratio is: [1] (k)
A solid of mass 150 g at 200
o
C is placed in 0.4 kg of water at 20
o
C till a constant temperature is
attained. If the S.H.C. of the solid is 0.5 Jg
-1
 K
-1
, find the resulting temperature of the mixture.
[1] (l)
a)
27.7
o
C
b)
37.7
o
C
c)
47.7
o
C
d)
57.7
o
C
a)
kJ Kg
-1 b)
Jkg
-1
 K
-1
c)
Jkg
-1 d)
cal 
o
C
-1
S.I. unit of thermal capacity is: [1] (m)
a) - 1.5 b) + 6.67
c) + 1.5 d) - 6.67
A convex lens of focal length 40 cm, a concave lens of focal length 40 cm and a concave lens of focal
length 15 cm are placed in contact. The power of the combination in dioptre is
[1] (n)
a) absorbed b) transmitted
c) refraction d) reflected
When a beam of light strikes a glass slab a part of it is: [1] (o)
2. Answer the following questions: [15]
i. What is the relationship between the mechanical advantage and the velocity ratio for ideal
machine
[1]
ii. In a single fixed pulley, if the effort moves by a distance x downwards, by what height is the
load raised upwards?
[1]
iii. A pulley system has there pulleys. A load of 120 N is overcome by applying an effort of 50 N.
Calculate the mechanical advantage?
[1]
(a)
State the direction of:
i. Centripetal force
ii. Centrifugal force
[2] (b)
A nut which can be broken by applying a force of 60 kgf, is broken by using a nut cracker having its
handle 15 cm long by placing it at a distance of 2 cm from the hinge. Calculate the minimum force
needed to break the nut.
[2] (c)
Scissors for cutting cloth have blades much longer than handles. Why? [2] (d)
A van of mass 2000 kg is travelling at 10 ms
-1
. Calculate its kinetic energy. If its speed increases to
20 ms
-1
, by how much amount does its kinetic energy increases?
[2] (e)
Find the equivalent resistance of the given network between P & Q [2] (f)
If boy fires a gun and hears its echo after 5s. The boy then moves 310 m towards the hill and fires the
gun again. This time, he hears the echo after 3s. Calculate the speed of the sound.
[2] (g)
3. Answer the following questions; [10]
Briefly mention, why does the sky at noon appear white? [2] (a)
Calculate the resistance of 1 km long copper wire of radius 1 mm. 
(Resistivity of copper is 1.72  10
-8
  m).
[2] (b)
× O If the current I through a resistor is increased by 100% (assume that temperature remains unchanged), [2] (c)
Section B
Attempt any 4 questions
then find the increase in power dissipated.
A piece of iron of mass 100 g kept inside a furnace for a long time and then put in a calorimeter of
water equivalent 10 g containing 240 g of water at 20°C. The mixture attains an equilibrium
temperature of 60°C. Find the temperature of the furnace-specific heat of iron = 470 J/kg-K.
[2] (d)
i. Why is a nuclear fusion reaction called a thermo nuclear reaction?
ii. Complete the reaction: 
 + ________ + Energy.
[2] (e)
H e + H ? H e 3 2 2 1 4 2 4. Answer the following questions: [10]
A convex lens has a focal length of 20 cm. At what distance from the lens should the object be placed
so that the image is formed at 40 cm on the other side of the lens? Also, state the nature of the image
formed.
[3] (a)
When 8000 J of heat is given to 200 g of copper at 20
o
C, determine the final temperature, if the
specific heat capacity of copper is 0.4 Jg
-1
 
o
C
-1
.
[3] (b)
A student wants to burn a piece of paper using a convex lens in day light, rather than using match
stick or any direct flame. Will he be able to, if yes justify your answer with a ray diagram?
[4] (c)
5. Answer the following questions: [10]
i. Draw a labelled ray diagram to illustrate (a) critical angle (b) total internal reflection for a ray of
light moving from one medium to another.
ii. Write a formula to express the relationship between refractive index of the denser medium with
respect to rarer medium and its critical angle for that pair of media.
[3] (a)
A prism deviates a monochromatic ray of light through an angle , where the angle of incidence at the
surface of the prism is i.
i. Draw a graph showing the variation of  with i. On your graph, show the angle of minimum
deviation.
ii. What is the relation between the angle of incidence and the angle of emergence when the ray
suffers minimum deviation.
[3] (b) d d How can we explain the reddish appearance of the sun at sunrise or sunset? Why does it not appear
red at noon?
[4] (c)
6. Answer the following questions: [10]
A block and tackle system has the velocity ratio 4, labelled diagram of the system indicating the point
of application and the directions of load and effort is given below. A man can exert a pull of 500 N.
[3] (a)
What is the maximum load he can raise with this pulley system if its efficiency
i. Define the term momentum.
ii. How is force related to the momentum of a body?
iii. State the condition when the change in momentum of a body depends only on the change in its
velocity.
[3] (b)
Explain, how the work is related to direction of force and displacement. [4] (c)
7. Answer the following questions: [10]
A submarine produces a ultrasonic waves of velocity 1500 m/s in water. The officer receives signal
after 50s of emission of ultrasonic waves. Find the distance of object which is present in the bottom of
sea.
[3] (a)
A nucleus 
Z
X
A
 emits an alpha particle followed by -emission, there after it emits two -particles to
form X
3
i. Copy and complete the value of A and Z for X
3
 
ii. Out of  and  radiation.
a. Which radiation is the most penetrating?
b. Which radiations are negatively charged?
[3] (b)
? ß X A X ? - a X 1 ? - ? X 2 ? - 2 ß X 3 a , ß ? The following diagram shows the displacement time graph for a vibrating body.
i. Name the type of vibration produced by the vibrating body.
ii. Give one example of a body producing such vibrations. 
iii. Why is the amplitude of the wave gradually decreasing?
iv. What will happen to the vibrations of the body after sometime?
[4] (c)
8. Answer the following questions: [10]
A copper wire of resistivity 1.63  10
-8
 -m has cross-section area of 10.3  10
-4
 cm
2
. Calculate
[3] (a)
× O ×