ICSE Class 10 Physics Sample Paper 2025 - 1 | 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) 1 Nm b) 6 Nm
c) 2 Nm d) 4 Nm
Study the diagram alongside and calculate the moment of couple. [1] (a)
a) slowed down less and refracted less b) slowed down more and refracted less
c) slowed down more and refracted more d) slowed down less and refracted more
When white light is dispersed by a prism, compared with blue light, the red light is [1] (b)
a) a constant energy which is the sum of
potential and kinetic energy
b) only kinetic energy
c) maximum kinetic energy at extreme
position
d) maximum potential energy at its mean
position
A pendulum is oscillating freely. Its bob has: [1] (c)
a) in the order of ,  and  particles b) -radiations or -radiations
c) simultaneously  and  radiations d) X-rays and -rays
A radioactive substances emits: [1] (d)
a ß ? a ß a , ß ? ? Assertion (A): When a force acts on a stationary rigid body which is free to move and if body starts
moving in straight path in direction of applied force, then it is said to be linear motion. 
[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) 1 Nm b) 6 Nm
c) 2 Nm d) 4 Nm
Study the diagram alongside and calculate the moment of couple. [1] (a)
a) slowed down less and refracted less b) slowed down more and refracted less
c) slowed down more and refracted more d) slowed down less and refracted more
When white light is dispersed by a prism, compared with blue light, the red light is [1] (b)
a) a constant energy which is the sum of
potential and kinetic energy
b) only kinetic energy
c) maximum kinetic energy at extreme
position
d) maximum potential energy at its mean
position
A pendulum is oscillating freely. Its bob has: [1] (c)
a) in the order of ,  and  particles b) -radiations or -radiations
c) simultaneously  and  radiations d) X-rays and -rays
A radioactive substances emits: [1] (d)
a ß ? a ß a , ß ? ? Assertion (A): When a force acts on a stationary rigid body which is free to move and if body starts
moving in straight path in direction of applied force, then it is said to be linear motion. 
[1] (e)
Physics
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.
Reason (R): If free body is acted upon by two unequal forces in opposite direction, but not in one
line, the effect is that the body will possess rotational motion only.
a) first focal point b) second focal point
c) aperture of lens d) optical centre
The point on the principal axis of a convex lens, such that rays of light starting from it on passing
through the lens, move parallel to the principal axis is called:
[1] (f)
a) 24 m b) 12 m
c) 17 m d) 51 m
For hearing an echo, the minimum distance between the source of sound and reflecting body should
be
[1] (g)
a) loudness b) speed
c) all of these d) frequency
The voice of women is shrill as compared to men because of the difference in their: [1] (h)
a) 10 b) 8 
c) 5 d) 1 
The current flowing through a resistor connected in an electric circuit and the potential difference
applied across its ends are shown in figure below. The value of the resistance of the resistor is 
 
[1] (i)
O O O O a) remains unchanged in strength and
direction
b) gets reversed in direction
c) decreases in strength d) increases in strength
By reversing the direction of current in an electromagnet, the magnetic field produced by it [1] (j)
a) 0.18 m b) 1.5 m
c) 3.0 m d) 0.625 m
A nut can be opened by a lever of length 0.25 m by applying a force of 80 N. What should be the
length of lever, if a force of 32 N is enough to open the nut?
[1] (k)
a)
42 JKg
-1
 K
-1 b)
4200 JKg
-1
 k
-1
c)
4.2 Jkg
-1
 K
-1 d)
420 JKg
-1
 K
-1
The specific heat capacity of water in S.I. system is: [1] (l)
How many grams of ice at -14
o
C are needed to cool 200 g of water from 25
o
C to 10
o
C? (Take,
specific heat of ice = 0.5 cal g
-1
 
o
C
-1
 and latent heat of ice = 80 cal g
-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) 1 Nm b) 6 Nm
c) 2 Nm d) 4 Nm
Study the diagram alongside and calculate the moment of couple. [1] (a)
a) slowed down less and refracted less b) slowed down more and refracted less
c) slowed down more and refracted more d) slowed down less and refracted more
When white light is dispersed by a prism, compared with blue light, the red light is [1] (b)
a) a constant energy which is the sum of
potential and kinetic energy
b) only kinetic energy
c) maximum kinetic energy at extreme
position
d) maximum potential energy at its mean
position
A pendulum is oscillating freely. Its bob has: [1] (c)
a) in the order of ,  and  particles b) -radiations or -radiations
c) simultaneously  and  radiations d) X-rays and -rays
A radioactive substances emits: [1] (d)
a ß ? a ß a , ß ? ? Assertion (A): When a force acts on a stationary rigid body which is free to move and if body starts
moving in straight path in direction of applied force, then it is said to be linear motion. 
[1] (e)
Physics
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.
Reason (R): If free body is acted upon by two unequal forces in opposite direction, but not in one
line, the effect is that the body will possess rotational motion only.
a) first focal point b) second focal point
c) aperture of lens d) optical centre
The point on the principal axis of a convex lens, such that rays of light starting from it on passing
through the lens, move parallel to the principal axis is called:
[1] (f)
a) 24 m b) 12 m
c) 17 m d) 51 m
For hearing an echo, the minimum distance between the source of sound and reflecting body should
be
[1] (g)
a) loudness b) speed
c) all of these d) frequency
The voice of women is shrill as compared to men because of the difference in their: [1] (h)
a) 10 b) 8 
c) 5 d) 1 
The current flowing through a resistor connected in an electric circuit and the potential difference
applied across its ends are shown in figure below. The value of the resistance of the resistor is 
 
[1] (i)
O O O O a) remains unchanged in strength and
direction
b) gets reversed in direction
c) decreases in strength d) increases in strength
By reversing the direction of current in an electromagnet, the magnetic field produced by it [1] (j)
a) 0.18 m b) 1.5 m
c) 3.0 m d) 0.625 m
A nut can be opened by a lever of length 0.25 m by applying a force of 80 N. What should be the
length of lever, if a force of 32 N is enough to open the nut?
[1] (k)
a)
42 JKg
-1
 K
-1 b)
4200 JKg
-1
 k
-1
c)
4.2 Jkg
-1
 K
-1 d)
420 JKg
-1
 K
-1
The specific heat capacity of water in S.I. system is: [1] (l)
How many grams of ice at -14
o
C are needed to cool 200 g of water from 25
o
C to 10
o
C? (Take,
specific heat of ice = 0.5 cal g
-1
 
o
C
-1
 and latent heat of ice = 80 cal g
-1
)
[1] (m)
a) 27 g b) 31 g
c) 20 g d) 30 g
a) 0.75 cm b) 1.75 cm
c) 3.75 cm d) 2.75 cm
A coin is placed at a depth of 15 cm in a beaker containing water. The refractive index of water is ,
calculate height through which the image of the coin is raised.
[1] (n)
4 3 a)
more than 45
o
, but not 90
o b)
90
o
c)
less than 45
o
, but not zero degree
d)
less than 45
o
The critical angle for a material X is 45
o
. The total internal reflection will take place, if the angle of
incidence in the denser medium is:
[1] (o)
2. Answer the following questions: [15]
i. Name a machine which can be used to
i. Multiply force.
ii. Change the direction of force applied.
[1]
ii. 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]
iii. Diagram given in below is representing a pulley system having a velocity ratio 3 and an
efficiency of 80%. Calculate the mechanical advantage and efficiency. 
[1]
(a)
Draw a neat labelled diagram for a particle moving in a circular path with a constant speed. In your
diagram, show the direction of velocity at any instant.
[2] (b)
The diagram below shows a claw hammer used to remove a nail: 
i. To which class of lever does it belong?
ii. Give one more example of the same class of lever mentioned by you in (i) for which the
mechanical advantage is greater than 1.
[2] (c)
When a body is placed on a table top, it exerts a force equal to its weight downwards on the table top
but does not move or fall. 
[2] (d)
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) 1 Nm b) 6 Nm
c) 2 Nm d) 4 Nm
Study the diagram alongside and calculate the moment of couple. [1] (a)
a) slowed down less and refracted less b) slowed down more and refracted less
c) slowed down more and refracted more d) slowed down less and refracted more
When white light is dispersed by a prism, compared with blue light, the red light is [1] (b)
a) a constant energy which is the sum of
potential and kinetic energy
b) only kinetic energy
c) maximum kinetic energy at extreme
position
d) maximum potential energy at its mean
position
A pendulum is oscillating freely. Its bob has: [1] (c)
a) in the order of ,  and  particles b) -radiations or -radiations
c) simultaneously  and  radiations d) X-rays and -rays
A radioactive substances emits: [1] (d)
a ß ? a ß a , ß ? ? Assertion (A): When a force acts on a stationary rigid body which is free to move and if body starts
moving in straight path in direction of applied force, then it is said to be linear motion. 
[1] (e)
Physics
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.
Reason (R): If free body is acted upon by two unequal forces in opposite direction, but not in one
line, the effect is that the body will possess rotational motion only.
a) first focal point b) second focal point
c) aperture of lens d) optical centre
The point on the principal axis of a convex lens, such that rays of light starting from it on passing
through the lens, move parallel to the principal axis is called:
[1] (f)
a) 24 m b) 12 m
c) 17 m d) 51 m
For hearing an echo, the minimum distance between the source of sound and reflecting body should
be
[1] (g)
a) loudness b) speed
c) all of these d) frequency
The voice of women is shrill as compared to men because of the difference in their: [1] (h)
a) 10 b) 8 
c) 5 d) 1 
The current flowing through a resistor connected in an electric circuit and the potential difference
applied across its ends are shown in figure below. The value of the resistance of the resistor is 
 
[1] (i)
O O O O a) remains unchanged in strength and
direction
b) gets reversed in direction
c) decreases in strength d) increases in strength
By reversing the direction of current in an electromagnet, the magnetic field produced by it [1] (j)
a) 0.18 m b) 1.5 m
c) 3.0 m d) 0.625 m
A nut can be opened by a lever of length 0.25 m by applying a force of 80 N. What should be the
length of lever, if a force of 32 N is enough to open the nut?
[1] (k)
a)
42 JKg
-1
 K
-1 b)
4200 JKg
-1
 k
-1
c)
4.2 Jkg
-1
 K
-1 d)
420 JKg
-1
 K
-1
The specific heat capacity of water in S.I. system is: [1] (l)
How many grams of ice at -14
o
C are needed to cool 200 g of water from 25
o
C to 10
o
C? (Take,
specific heat of ice = 0.5 cal g
-1
 
o
C
-1
 and latent heat of ice = 80 cal g
-1
)
[1] (m)
a) 27 g b) 31 g
c) 20 g d) 30 g
a) 0.75 cm b) 1.75 cm
c) 3.75 cm d) 2.75 cm
A coin is placed at a depth of 15 cm in a beaker containing water. The refractive index of water is ,
calculate height through which the image of the coin is raised.
[1] (n)
4 3 a)
more than 45
o
, but not 90
o b)
90
o
c)
less than 45
o
, but not zero degree
d)
less than 45
o
The critical angle for a material X is 45
o
. The total internal reflection will take place, if the angle of
incidence in the denser medium is:
[1] (o)
2. Answer the following questions: [15]
i. Name a machine which can be used to
i. Multiply force.
ii. Change the direction of force applied.
[1]
ii. 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]
iii. Diagram given in below is representing a pulley system having a velocity ratio 3 and an
efficiency of 80%. Calculate the mechanical advantage and efficiency. 
[1]
(a)
Draw a neat labelled diagram for a particle moving in a circular path with a constant speed. In your
diagram, show the direction of velocity at any instant.
[2] (b)
The diagram below shows a claw hammer used to remove a nail: 
i. To which class of lever does it belong?
ii. Give one more example of the same class of lever mentioned by you in (i) for which the
mechanical advantage is greater than 1.
[2] (c)
When a body is placed on a table top, it exerts a force equal to its weight downwards on the table top
but does not move or fall. 
[2] (d)
Section B
Attempt any 4 questions
i. Name the force exerted by the table top.
ii. What is the direction of the force?
Two bodies, A and B of equal mass are kept at heights 20 m and 30 m respectively. Calculate the ratio
of their potential energies.
[2] (e)
Calculate the work done in moving a charge of 4 C from a point at 220 V to a point at 230 V. [2] (f)
State two differences between light waves and sound waves. [2] (g)
3. Answer the following questions; [10]
i. Define the power of a lens.
ii. A lens has focal length 25 cm. Calculate the power of lens.
[2] (a)
Calculate the effective resistance across AB: [2] (b)
How many protons will constitute a charge of 1 C? [2] (c)
i. Give one example, where high specific heat capacity of water is used as a heat reservoir.
ii. Give one example, where high specific heat capacity of water is used for cooling purposes.
[2] (d)
Show by equations, the effect on the proton number Z and mass number A of the parent nucleus
brought about by the two types of radioactive decay.
[2] (e)
4. Answer the following questions: [10]
Explain the meaning of reversibility of light. [3] (a)
i. Define calorimetry.
ii. Name the material used for making a Calorimeter.
iii. Why is a Calorimeter made up of thin sheets of the above material answered in (ii)?
[3] (b)
If the speed of light in air is 3  10
8
 ms
-1
, determine the speed of light in glass. The refractive index
of glass of 1.5.
[4] (c)
× 5. Answer the following questions: [10]
A ray of monochromatic light is incident from air on a glass slab.
i. Draw a labelled ray diagram showing the change in the path of the ray till it emerges from the
glass slab.
ii. Name the two rays that are parallel to each other.
iii. Mark the lateral displacement in your diagram.
[3] (a)
i. If a monochromatic beam of light, undergoes minimum deviation through an equiangular prism,
how does the beam pass through the prism, with respect to its base?
[3] (b)
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) 1 Nm b) 6 Nm
c) 2 Nm d) 4 Nm
Study the diagram alongside and calculate the moment of couple. [1] (a)
a) slowed down less and refracted less b) slowed down more and refracted less
c) slowed down more and refracted more d) slowed down less and refracted more
When white light is dispersed by a prism, compared with blue light, the red light is [1] (b)
a) a constant energy which is the sum of
potential and kinetic energy
b) only kinetic energy
c) maximum kinetic energy at extreme
position
d) maximum potential energy at its mean
position
A pendulum is oscillating freely. Its bob has: [1] (c)
a) in the order of ,  and  particles b) -radiations or -radiations
c) simultaneously  and  radiations d) X-rays and -rays
A radioactive substances emits: [1] (d)
a ß ? a ß a , ß ? ? Assertion (A): When a force acts on a stationary rigid body which is free to move and if body starts
moving in straight path in direction of applied force, then it is said to be linear motion. 
[1] (e)
Physics
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.
Reason (R): If free body is acted upon by two unequal forces in opposite direction, but not in one
line, the effect is that the body will possess rotational motion only.
a) first focal point b) second focal point
c) aperture of lens d) optical centre
The point on the principal axis of a convex lens, such that rays of light starting from it on passing
through the lens, move parallel to the principal axis is called:
[1] (f)
a) 24 m b) 12 m
c) 17 m d) 51 m
For hearing an echo, the minimum distance between the source of sound and reflecting body should
be
[1] (g)
a) loudness b) speed
c) all of these d) frequency
The voice of women is shrill as compared to men because of the difference in their: [1] (h)
a) 10 b) 8 
c) 5 d) 1 
The current flowing through a resistor connected in an electric circuit and the potential difference
applied across its ends are shown in figure below. The value of the resistance of the resistor is 
 
[1] (i)
O O O O a) remains unchanged in strength and
direction
b) gets reversed in direction
c) decreases in strength d) increases in strength
By reversing the direction of current in an electromagnet, the magnetic field produced by it [1] (j)
a) 0.18 m b) 1.5 m
c) 3.0 m d) 0.625 m
A nut can be opened by a lever of length 0.25 m by applying a force of 80 N. What should be the
length of lever, if a force of 32 N is enough to open the nut?
[1] (k)
a)
42 JKg
-1
 K
-1 b)
4200 JKg
-1
 k
-1
c)
4.2 Jkg
-1
 K
-1 d)
420 JKg
-1
 K
-1
The specific heat capacity of water in S.I. system is: [1] (l)
How many grams of ice at -14
o
C are needed to cool 200 g of water from 25
o
C to 10
o
C? (Take,
specific heat of ice = 0.5 cal g
-1
 
o
C
-1
 and latent heat of ice = 80 cal g
-1
)
[1] (m)
a) 27 g b) 31 g
c) 20 g d) 30 g
a) 0.75 cm b) 1.75 cm
c) 3.75 cm d) 2.75 cm
A coin is placed at a depth of 15 cm in a beaker containing water. The refractive index of water is ,
calculate height through which the image of the coin is raised.
[1] (n)
4 3 a)
more than 45
o
, but not 90
o b)
90
o
c)
less than 45
o
, but not zero degree
d)
less than 45
o
The critical angle for a material X is 45
o
. The total internal reflection will take place, if the angle of
incidence in the denser medium is:
[1] (o)
2. Answer the following questions: [15]
i. Name a machine which can be used to
i. Multiply force.
ii. Change the direction of force applied.
[1]
ii. 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]
iii. Diagram given in below is representing a pulley system having a velocity ratio 3 and an
efficiency of 80%. Calculate the mechanical advantage and efficiency. 
[1]
(a)
Draw a neat labelled diagram for a particle moving in a circular path with a constant speed. In your
diagram, show the direction of velocity at any instant.
[2] (b)
The diagram below shows a claw hammer used to remove a nail: 
i. To which class of lever does it belong?
ii. Give one more example of the same class of lever mentioned by you in (i) for which the
mechanical advantage is greater than 1.
[2] (c)
When a body is placed on a table top, it exerts a force equal to its weight downwards on the table top
but does not move or fall. 
[2] (d)
Section B
Attempt any 4 questions
i. Name the force exerted by the table top.
ii. What is the direction of the force?
Two bodies, A and B of equal mass are kept at heights 20 m and 30 m respectively. Calculate the ratio
of their potential energies.
[2] (e)
Calculate the work done in moving a charge of 4 C from a point at 220 V to a point at 230 V. [2] (f)
State two differences between light waves and sound waves. [2] (g)
3. Answer the following questions; [10]
i. Define the power of a lens.
ii. A lens has focal length 25 cm. Calculate the power of lens.
[2] (a)
Calculate the effective resistance across AB: [2] (b)
How many protons will constitute a charge of 1 C? [2] (c)
i. Give one example, where high specific heat capacity of water is used as a heat reservoir.
ii. Give one example, where high specific heat capacity of water is used for cooling purposes.
[2] (d)
Show by equations, the effect on the proton number Z and mass number A of the parent nucleus
brought about by the two types of radioactive decay.
[2] (e)
4. Answer the following questions: [10]
Explain the meaning of reversibility of light. [3] (a)
i. Define calorimetry.
ii. Name the material used for making a Calorimeter.
iii. Why is a Calorimeter made up of thin sheets of the above material answered in (ii)?
[3] (b)
If the speed of light in air is 3  10
8
 ms
-1
, determine the speed of light in glass. The refractive index
of glass of 1.5.
[4] (c)
× 5. Answer the following questions: [10]
A ray of monochromatic light is incident from air on a glass slab.
i. Draw a labelled ray diagram showing the change in the path of the ray till it emerges from the
glass slab.
ii. Name the two rays that are parallel to each other.
iii. Mark the lateral displacement in your diagram.
[3] (a)
i. If a monochromatic beam of light, undergoes minimum deviation through an equiangular prism,
how does the beam pass through the prism, with respect to its base?
[3] (b)
ii. If white light is used in the same way as in (i) above, what change is expected in the emergent
beam?
Jatin puts a pencil into a glass container having water and is surprised to see the pencil in a different
state.
i. What change is observed in the appearance of the pencil?
ii. Name the phenomenon responsible for the change.
iii. Draw a ray diagram showing how the eyes sees the pencil.
[4] (c)
6. Answer the following questions: [10]
State the class of lever to which each one of the following items belongs. Also give the relative
position of load (L), effort (E), and fulcrum (F) in each case
i. Sea-saw
ii. Knife
iii. Nut cracker
[3] (a)
i. With reference to the direction of action, how does a centripetal force differ from a centrifugal
force during uniform circular motion?
ii. Is centrifugal force the force of reaction of centripetal force?
iii. Compare the magnitudes of centripetal and centrifugal force.
[3] (b)
If a man raises a box of 50 kg mass to a height of 2 m, while the other man raises the same box to a
same height in 5 min. Compare
i. the work done.
ii. the power developed by them.
[4] (c)
7. Answer the following questions: [10]
A person standing between two vertical cliffs and 480 m from the nearest cliff shouts. He hears the
first echo after 3 s and the second echo 2 s later. 
Calculate:
i. The speed of sound.
ii. The distance of the other cliff from the person.
[3] (a)
Arrange  and  rays in ascending order with respect to their
i. Penetrating power.
ii. Ionising power.
iii. Biological effect.
[3] (b) a , ß ? i. Name the phenomenon involved in tuning a radio set to a particular station.
ii. Define the phenomenon named by you in part (i) above.
iii. What do you understand by loudness of sound?
iv. In which units is the loudness of sound measured?
[4] (c)
8. Answer the following questions: [10]
i. Write one advantage of connecting electrical appliances in parallel combination.
ii. What characteristics should a fuse wire have?
iii. Which wire in a power circuit is connected to the metallic body of the appliance?
[3] (a)
The ore of Uranium found in nature contains  and . Although both the isotopes are
fissionable, it is found out experimentally that one of the two isotopes is more easily fissionable.
[3] (b) U 2 3 8 9 2 U 2 3 5 9 2