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# Physics Set A 2017-2018 ICSE Class 10 Question Paper Solution

Course
Physics [Set A]
Date: March 2018

[10]1
[2]1.1
[1]1.1.1

State and define the SI unit of power

Concept: Work, Energy, Power - Relation with Force
Chapter: [0.011000000000000001] Work, Power and Energy
[1]1.1.2

How is the unit horsepower related to the S.I. unit of power?

Concept: Work, Energy, Power - Relation with Force
Chapter: [0.011000000000000001] Work, Power and Energy
[2]1.2

State the energy changes in the following cases while in use An electric iron.

Concept: Different Types of Energy
Chapter: [0.011000000000000001] Work, Power and Energy

State the energy changes in the following cases while in use A ceiling fan

Concept: Different Types of Energy
Chapter: [0.011000000000000001] Work, Power and Energy
[2]1.3

The diagram below shows a lever in use:

1) To which class of levers does it belong?

2) Without changing the dimensions of the lever, if the load is shifted towards the fulcrum what happens to the mechanical advantage of the lever?

Concept: Concept of Lever
Chapter: [0.012] Machines
[2]1.4
[1]1.4.1

Why is the ratio of the velocities of light of wavelengths 4000Å and 8000Å in vacuum 1: 1?

Concept: Refraction of Light - Refraction of Light Through a Glass Block and a Triangular Prism
Chapter: [0.021] Refraction of Light Through Plane Surface
[1]1.4.2

Which of the above wavelengths has a higher frequency?

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]1.5
[1]1.5.1

Why is the motion of a body moving with a constant speed around a circular path said to be accelerated?

Concept: Uniform Circular Motion
Chapter:
[1]1.5.2

Name the unit of physical quantity obtained by the formula (2K)/V^2 Where k: kinetic energy, V: Linear velocity

Concept: Uniform Circular Motion
Chapter:
[10]2
[2]2.1

The power of a lens is - 5D.

1) Find its focal length.

2) Name the type of lens.

Concept: Types of Lenses (Converging and Diverging),
Chapter: [0.023] Refraction of Light Through a Lense
[2]2.2

State the position of the object in front of a converging lens if It produces a real and same size image of the object

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

State the position of the object in front of a converging lens if It is used as a magnifying lens.

Concept: Types of Lenses (Converging and Diverging),
Chapter: [0.023] Refraction of Light Through a Lense
[2]2.3
[1]2.3.1

State the relation between the critical angle and the absolute refractive index of a medium.

Concept: Total Internal Reflection - Critical Angle
Chapter: [0.021] Refraction of Light Through Plane Surface
[1]2.3.2

Which colour of light has a higher critical angle? Red light or Greenlight.

Concept: Total Internal Reflection - Critical Angle
Chapter: [0.021] Refraction of Light Through Plane Surface
[2]2.4
[1]2.4.1

What do you understand by the term Scattering of light?

Concept: Some Natural Phenomena Due to Sunlight
Chapter: [0.022000000000000002] Spectrum
[1]2.4.2

The smoke from a fire looks white. Which of the following statements is true?

1) Molecules of the smoke are bigger than the wavelength of light

2) Molecules of the smoke are smaller than the wavelength of light.

Concept: Some Natural Phenomena Due to Sunlight
Chapter: [0.022000000000000002] Spectrum
[2]2.5

The following diagram shows a 60°, 30°, 90° glass prism of critical angle 42°, Copy the diagram and complete the path of incident ray AB emerging out of the prism marking the angle of incidence on each 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
[10]3
[2]3.1

Displacement distance graph of two sound waves A and B, travelling in a medium, are as shown in the diagram below.

Study the two sound waves and compare their:

1) Amplitudes

2) Wavelengths

Concept: Sound - Reflection of Sound Waves
Chapter: [0.03] Sound
[2]3.2

You have three resistors of values 2Ω, 3Ω and 5Ω. How will you join them so that the total resistance is more than 7Ω?

1) Draw a diagram for the arrangement

2) Calculate the equivalent resistance.

Concept: Concepts of Pd (V), Current (I), Resistance (R) and Charge (Q).
Chapter: [0.040999999999999995] Current Electricity
[2]3.3
[1]3.3.1

What do you understand by the term nuclear fusion?

Concept: Concept of Nuclear Fission and Fusion;
Chapter: [6] Modern Physics
[1]3.3.2

Nuclear power plants use the nuclear fission reaction to produce electricity.

What is the advantage of producing electricity by fusion reaction?

Concept: Concept of Nuclear Fission and Fusion;
Chapter: [6] Modern Physics
[2]3.4
[1]3.4.1

What do you understand by free vibrations of a body?

Concept: Sound - Natural Vibrations
Chapter: [0.03] Sound
[1]3.4.2

Why does the amplitude of a vibrating body continuously decrease during damped vibrations?

Concept: Sound - Damped Vibrations
Chapter: [0.03] Sound
[2]3.5
[1]3.5.1

How is the e.m.f. across primary and secondary coils of a transformer related with the number of turns of the coil in them?

Concept: Concept of Transformer
Chapter: [0.043] Electro Manetism
[1]3.5.2

On which type of current do transformers work?

Concept: Concept of Transformer
Chapter: [0.043] Electro Manetism
[10]4
[2]4.1
[1]4.1.1

How can a temperature in degree Celsius be converted into S.I. unit of temperature?

Concept: Concept of Calorimetry
Chapter: [0.05] Heat

Radiations given out from a source when subjected to an electric field in a direction perpendicular to their path are shown below in the diagram. The arrows show the path of the radiation A, B and C. Answer the following questions in terms of A, B and C.

1) Name the radiation B which is unaffected by the electrostatic field.

2) Why does the radiation C deflect more than A?

3) Which among the three causes the least biological damage externally.

4) Name the radiation which is used in carbon dating.

Concept: Radioactivity and Changes in the Nucleus
Chapter: [6] Modern Physics
[1]4.1.2

A liquid X has the maximum specific heat capacity and is used as a coolant in Car Radiators. Name the liquid X.

Concept: Calorimetry - Specific Heat Capacity
Chapter: [0.05] Heat
[2]4.2

A solid metal weighing 150 g melts at its melting point of 800 °C by providing heat at the rate of 100 W. The time taken for it to completely melt at the same temperature is 4 min. What is the specific latent heat of fusion of the metal?.

Concept: Calorimetry - Specific Heat Capacity
Chapter: [0.05] Heat
[2]4.3

Identify the following wires used in a household circuit: The wire is also called as the phase wire.

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

Identify the following wires used in a household circuit: The wire is connected to the top terminal of a three pin socket.

Concept: Household Circuits – Main Circuit
Chapter: [0.042] Electrical Power and Energy and Household Circuits
[2]4.4
[1]4.4.1

What are isobars?

Concept: Radioactivity and Changes in the Nucleus
Chapter: [6] Modern Physics
[1]4.4.2

Give one example of isobars.

Concept: Radioactivity and Changes in the Nucleus
Chapter: [6] Modern Physics
[2]4.5

State any two advantages of electromagnets over permanent magnets.

Concept: Magnetic Effect of a Current
Chapter: [0.043] Electro Manetism
[10]5
[3]5.1

Derive a relationship between S.I. and C.C.S. unit of work

Concept: Concept of Work, Energy, Power
Chapter: [0.011000000000000001] Work, Power and Energy

A force acts on a body and displaces it by a distance S in a direction at an angle θ with the direction of the force. What should be the value of θ to get the maximum positive work?

Concept: Concept of Work, Energy, Power
Chapter: [0.011000000000000001] Work, Power and Energy
[3]5.2

A half metre rod is pivoted at the centre with two weights of 20gf and 12gf suspended at a perpendicular distance of 6 cm and 10 cm from the pivot respectively as shown below.

1) Which of the two forces acting on the rigid rod causes clockwise moment?

2) Is the rod in equilibrium?

3) The direction of 20 kgf force is reversed. What is the magnitude of the resultant moment of the forces on the rod?

Concept: Force - Moment of a Force
Chapter: [0.013000000000000001] Force
[4]5.3

Draw a diagram to show a block and tackle pulley system having a velocity ratio of 3 marking the direction of load(L), effort(E) and tension(T).

Concept: Concept of Pulley System
Chapter: [0.012] Machines

The pulley system has drawn lifts a load of 150 N when an effort of 60 N is applied. Find its mechanical advantage.

Concept: Concept of Pulley System
Chapter: [0.012] Machines

Is the above pulley system an ideal machine or not?

Concept: Concept of Pulley System
Chapter: [0.012] Machines
[10]6
[3]6.1

A ray of light X Y passes through a right-angled isosceles prism as shown below

1) What is the angle through which the incident ray deviates and emerges out of the prism?

2) Name the instrument Whore this action of the prism is put into use.

3) Which prism surface will behave as a mirror?

Concept: Total Internal Reflection
Chapter: [0.021] Refraction of Light Through Plane Surface
[3]6.2

An object AB is placed between O and F1 on the principal axis of a converging lens as shown in the diagram.

Copy the diagram and by using three standard rays starting from point A, obtain an image of the object AB.

Concept: Refraction of Light - Image Formation in Lenses Using Ray Diagrams - Convex Lens
Chapter:
[4]6.3

An object is placed at a distance of 12 cm from a convex lens of focal length 8 cm. Find :

1) the position of the image

2) nature of the image

Concept: Refraction of Light - Image Formation in Lenses Using Ray Diagrams - Convex Lens
Chapter:
[10]7
[3]7.1

Draw the diagram of a right-angled isosceles prism which is used to make an invented image erect

Concept: Total Internal Reflection
Chapter: [0.021] Refraction of Light Through Plane Surface
[3]7.2

The diagram above shows a wire stretched over a sonometer. Stems of two vibrating tuning forks A and Bare touched to the wooden box of the sonometer. It is observed that the paper rider (a small piece of paper folded at the centre) present on the wire flies off when the stem of vibrating tuning fork B is touched to the wooden box but the paper just vibrates when the stem of vibrating tuning fork A is touched to the wooden box.

1) Name the phenomenon when the paper rider just vibrates.

2) Name the phenomenon when the paper rider flies off.

3) Why does the paper rider fly off when the stem of tuning fork B is touched to the box?

Concept: Sound - Forced Vibrations and Resonance
Chapter: [0.03] Sound
[3]7.3

A person is standing at the seashore. An observer on the ship which is anchored in between a vertical cliff and the person on the shore fires a gun. The person on the shore hears two sounds, 2 seconds and 3 seconds after seeing the smoke of the fired gun. If the speed of sound in the air is 320 ms-1 then calculate:

1) the distance between the observer on the ship and the person on the shore.

2) the distance between the cliff and the observer on the ship.

Concept: Sound - Loudness, Pitch and Quality of Sound
Chapter: [0.03] Sound
[10]8
[3]8.1

A fuse is rated 8A. Can it be used with an electrical appliance rated 5 KW, 200 V ? Give a reason.

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

Name two safety devices which are connected to the live wire of a household electric circuit

Concept: Electrical Energy and Power
Chapter: [0.042] Electrical Power and Energy and Household Circuits
[3]8.2

Find the equivalent resistance between A and B

Concept: Resistance of a System of Resistors - Resistors in Series
Chapter: [0.040999999999999995] Current Electricity

State whether the resistivity of a wire changes with the change in the thickness of the wire.

Concept: Concepts of Pd (V), Current (I), Resistance (R) and Charge (Q).
Chapter: [0.040999999999999995] Current Electricity
[4]8.3

An electric iron is rated 220V, 2kW.

1) if the iron is used for 2h daily find the cost of running it for one week if it costs 4.25 per kWh

2) Why is the fuse absolutely necessary in a power circuit?

Concept: Household Circuits – Main Circuit
Chapter: [0.042] Electrical Power and Energy and Household Circuits
[10]9
[3]9.1

Heat supplied to a solid change it into liquid. What is this change in the phase called?

Concept: Calorimetry - Specific Heat Capacity
Chapter: [0.05] Heat

During the phase change does the average kinetic energy of the molecules of the substance increase?

Concept: Calorimetry - Specific Heat Capacity
Chapter: [0.05] Heat

What is the energy absorbed during the phase change called?

Concept: Heat - Latent Heat
Chapter: [0.05] Heat
[3]9.2

State two differences between "Heat Capacity" and "Specific Heat Capacity".

Concept: Calorimetry - Specific Heat Capacity
Chapter: [0.05] Heat

Give a mathematical relation between Heat Capacity and Specific Heat Capacity.

Concept: Calorimetry - Specific Heat Capacity
Chapter: [0.05] Heat
[4]9.3

The temperature of 170g of water at 50°C is lowered to 5°C by adding a certain amount of ice to it. Find the mass of ice added.

Concept: Calorimetry - Specific Heat Capacity
Chapter: [0.05] Heat
[10]10
[3]10.1

The diagram shows a coil wound around a U shape soft iron bar AB.

1) What is the polarity induced at the ends A and B when the switch is pressed?

2) Suggest one way to strengthen the magnetic field in the electromagnet

3) What will be the polarities at A & B if the direction of current is reversed in the circuit?

Concept: Magnetic Effect of a Current
Chapter: [0.043] Electro Manetism
[3]10.2

The ore of Uranium found in nature contain ""_92U^218 and ""_92U^235. Although both the isotopes are fissionable. It is found out experimentally that one of the two isotopes is more easily fissionable.

1) Name the isotope of Uranium which is easily fissionable.

3) Write a nuclear reaction when Uranium 238 emits an alpha particle to form a Thorium (Th) nucleus

Concept: Concept of Nuclear Fission and Fusion;
Chapter: [6] Modern Physics
[4]10.3

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