# Physics Set 1 2018-2019 ICSE Class 10 Question Paper Solution

Physics [Set 1 ]
Date: March 2019

SECTION - I (40 Marks) Attempt all questions from this Section
1
1.a

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 one.

Concept: Machines as Force Multipliers
Chapter: [0.012] Machines
1.b

Two bodies A and B have masses in the ratio 5 : 1 and their kinetic energies are in the ratio 125:9. Find the ratio of their velocities.

Concept: Types of Energy
Chapter: [0.011000000000000001] Work, Power and Energy  Modern Physics
1.c

(i) Name the physical quantity which is measured in calories.
(ii) How is calorie related to the S.I. unit of that quantity ?

Concept: Concept of Calorimetry Numercials:
Chapter: [0.05] Heat
1.d

(i) Define couple.
(ii) State the S.I. unit of moment of couple.

Concept: Concept of Force - Moment of a Force
Chapter: [0.013000000000000001] Force
1.e

(i) Define critical angle.
(ii) State one important factor which affects the critical angle of a given medium.

Concept: Total Internal Reflection - Critical Angle
Chapter: [0.021] Refraction of Light Through Plane Surface
2
2.a

An electromagnetic radiation is used for photography in fog. 
(ii) Why is this radiation mentioned by you, ideal for this purpose ?

Chapter:  Modern Physics
2.b

(i) What is the relation between the refractive index of water with respect to air ("_aμ_\text(w)) and the refractive index of air with respect to water ("_\text(w)μ_ a) .
(ii) If the refractive index of water with respect to air ("_aμ_\text(w)) is5/3. Calculate the refractive index of air with respect to water ("_\text(w)μ_ a) .

Concept: Refraction of Light - Refraction of Light Through a Glass Block and a Triangular Prism
Chapter: [0.021] Refraction of Light Through Plane Surface
2.c

The specific heat capacity of a substance A is 3,800 Jkg "^(–1)K^(–1) and that of a substance B is 400 "^(–1)K^(–1). Which of the two substances is a good conductor of heat ? Give a reason for your answer.

Concept: Concept of Calorimetry
Chapter: [0.05] Heat
2.d

A man playing a flute is able to produce notes of different frequencies. If he closes the holes near his mouth, will the pitch of the note produced, increase or decrease ? Give a reason.

Concept: Concept of Sound - Loudness, Pitch and Quality of Sound
Chapter: [0.03] Sound
2.e

The diagram below shows a light source P embedded in a rectangular glass block ABCD of critical angle 42°. Complete the path of the ray PQ till it emerges out of the block. [Write necessary angles]. Concept: Refraction of Light - Refraction of Light Through a Glass Block and a Triangular Prism
Chapter: [0.021] Refraction of Light Through Plane Surface
3
3.a

(i) If the lens is placed in water instead of air, how does its focal length change ?
(ii) Which lens, thick or thin has greater focal length ?

Concept: Types of Lenses (Converging and Diverging),
Chapter: [0.023] Refraction of Light Through a Lense
3.b

Two waves of the same pitch have amplitudes in the ratio 1 : 3. What will be the ratio of their :
(i) intensities and
(ii) frequencies

Concept: Concept of Sound - Loudness, Pitch and Quality of Sound
Chapter: [0.03] Sound
3.c

How does an increase in the temperature affect the specific resistance of a :
(i) Metal and
(ii) Semiconductor ?

Concept: Ohm’s Law
Chapter: [0.040999999999999995] Current Electricity
3.d

(i) Define resonant vibrations.
(ii) Which characteristic of sound, makes it possible to recognize a person by his voice without seeing him?

Concept: Concept of Sound - Forced Vibrations and Resonance
Chapter: [0.03] Sound
3.e

Is it possible for a hydrogen "_1^1H nucleus to emit an alpha particle ? Give a reason for your answer.

Concept: Radioactivity and Changes in the Nucleus
Chapter:  Modern Physics
4
4.a

Calculate the effective resistance across AB? Concept: Ohm’s Law
Chapter: [0.040999999999999995] Current Electricity
4.b

(i) State whether the specific heat capacity of a substance remains the same when its state changes from  solid to liquid.

Concept: Calorimetry - Specific Heat Capacity
Chapter: [0.05] Heat
4.c

A magnet kept at the centre of two coils A and B is moved to and fro as shown in the diagram. The two galvanometers show deflection. State with a reason whether :

x > y

or

x< y    [x and y are magnitudes of deflection.]

Concept: Magnetic Effect of a Current
Chapter: [0.043] Electro Manetism
4.d

(i) Why is a nuclear fusion reaction called a thermo nuclear reaction ?
(ii) Complete the reaction :

""^3He_2 +""^2H_1 → "^4 He_2 + ......................+ Energy

Concept: Concept of Nuclear Fission and Fusion;
Chapter:  Modern Physics
4.e

State two ways to increase the speed of rotation of a D.C. motor.

Concept: Fleming’s Left Hand Rule
Chapter: [0.043] Electro Manetism
SECTION - II (40 Marks) Attempt any four questions from this Section
5
5.a

A body of mass 10 Kg is kept at a height of 5m. It is allowed to fall and reach the ground.
(i) What is the total mechanical energy possessed by the body at the height of 2m assuming it is a frictionless medium ?
(ii) What is the kinetic energy possessed by the body just before hitting the ground ? Take g = 10 m/s2.

Concept: Principle of Conservation of Energy
Chapter: [0.012] Machines
5.b

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 towards 100 cm

Concept: Concept of Force - Forces in Equilibrium
Chapter: [0.013000000000000001] Force
5.c

The diagram below shows a pulley arrangement : (i) Copy the diagram and mark the direction of tension on each strand of the string.
(ii) What is the velocity ratio of the arrangement ?
(iii) If the tension acting on the string is T, then what is the relationship between T and effort E ?
(iv) If the free end of the string moves through distance x, find the distance by which the load is raised.

Concept: Concept of Pulley System
Chapter: [0.012] Machines
6
6.a

How does the angle of deviation produced by a prism change with increase in the angle of incidence. Draw a curve showing the variation in the angle of deviation with the angle of incidence at a prism surface.

Concept: Refraction of Light - Refraction of Light Through a Glass Block and a Triangular Prism
Chapter: [0.021] Refraction of Light Through Plane Surface
6.b

A virtual diminished image is formed when an object is placed between the optical centre and the principal focus of a lens.

(i) Name the type of lens which forms the above image.
(ii) Draw a ray diagram to show the formation of the image with the above stated characteristics.

Concept: Refraction of Light - Image Formation in Lenses Using Ray Diagrams - Concave Lens
Chapter: [0.023] Refraction of Light Through a Lense
6.c

An object is placed at a distance 24 cm in front of a convex lens of focal length 8 cm.

(i) What is the nature of the image so formed ?
(ii) Calculate the distance of the image from the lens.
(iii) Calculate the magnification of the image.

Concept: Refraction of Light - Image Formation in Lenses Using Ray Diagrams - Concave Lens
Chapter: [0.023] Refraction of Light Through a Lense
7
7.a

It is observed that during march-past we hear a base drum distinctly from a distance compared to the side drums.
(i) Name the characteristics of sound associated with the above obervation.
(ii) Give a reason for the above observation.

Concept: Concept of Sound - Loudness, Pitch and Quality of Sound
Chapter: [0.03] Sound
7.b

A pendulum has a frequency of 4 vibrations per second. An oberver starts the pendulum and fires a gun simultaneously. He hears the echo from the cliff after 6 vibrations of the pendulum, if the velocity of sound in air is 340 m/s, find the distance betwen the cliff and the obsever.

Concept: Sound (Numerical)
Chapter: [0.03] Sound
7.c

Two pendulums C and D are suspended from a wire as shown in the figure give below. Pendulum C is made  to oscullate by displaying 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 ?

Concept: Concept of Sound - Forced Vibrations and Resonance
Chapter: [0.03] Sound
8
8.a

(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 ?

Concept: Household Circuits - Fuses
Chapter: [0.042] Electrical Power and Energy and Household Circuits
8.b

The diagram below shows a dual control switch circuit connected to a bulb. (i) Copy the diagram and complete it so that the bulb is switched ON.
(ii) Out of A and B which one is the live wire and which one is the neutral wire ?

Concept: Household Circuits - Switches
Chapter: [0.042] Electrical Power and Energy and Household Circuits
8.c The diagram above shows a circuit with the key k open. Calculate :
(i) the resistance of the circuit when the key k is open.
(ii) the current drawn from the cell when the key k is open.
(iii) the resistance of the circuit when the key k is closed.
(iv) the current drawn from the cell when the key k is closed.

Concept: Concept of Electrical Power and Household Circuits Numericals
Chapter: [0.042] Electrical Power and Energy and Household Circuits
9
9.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).

Concept: Concept of Calorimetry
Chapter: [0.05] Heat
9.b

The melting point of naphthalene is 80°C and the room temperature is 30°C. A sample of liquid naphthalene at 100°C is cooled down to the room temperature. Draw a temperature time graph to represent this cooling. In the graph, mark the region which corresponds to the freezing process.

Concept: Concept of Calorimetry
Chapter: [0.05] Heat
9.c

104g of water at 30°C is taken in a calorimeter made of copper of mass 42 g. When a certain mass of ice at 0°C is added to it, the final steady temperature of the mixture after the ice has melted, was found to be 10°C. Find the mass of ice added. [Specific heat capacity of water = 4.2 Jg–1°C–1 ; Specific latent heat of fusion of ice = 336 Jg–1; Specific heat capacity of copper = 0.4 Jg–1°C–1] .

Concept: Calorimetry - Specific Heat Capacity
Chapter: [0.05] Heat
10
10.a

Draw a neat labeled diagram of an A.C. generator

Concept: Ac Generator
Chapter: [0.040999999999999995] Current Electricity [0.042] Electrical Power and Energy and Household Circuits [0.043] Electro Manetism
10.b

(i) Define nuclear fission.
(ii) Rewrite and complete the following nuclear reaction by filling in the atomic number of Ba and mass number of Kr.

""_92^235U +""_0^1n → ""__^144 Ba +""_36^_ Kγ +3""_0^1 n +Energy

Concept: Concept of Nuclear Fission and Fusion;
Chapter:  Modern Physics
10.c

The diagram below shows a magnetic kept just below the conductor AB which is kept in North South direction. (i) In which direction will the needle deflect when the key is closed ?
(ii) Why is the deflection produced ?
(iii) What will be the change in the deflection if the magnetic needle is taken just above the conductor AB ?
(iv) Name one device which works on this principle.

Concept: Electrical Energy and Power
Chapter: [0.042] Electrical Power and Energy and Household Circuits

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