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# Question Paper Solutions - Physics 2017 - 2018 ICSE Class 10

SubjectPhysics
Year2017 - 2018 (March)

Question 1 to Question 4 is compulsory

Attempt Any Four Question From Question 5 to Question 10

Marks: 80
[10]1
[2]1.1
[1]1.1.1

State and define the SI unit of power

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

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

Chapter: [1] Force, Work, Power and Energy
Concept: Work, Energy, Power - Relation with Force
[2]1.2

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

Chapter: [1] Force, Work, Power and Energy
Concept: Different Types of Energy

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

Chapter: [1] Force, Work, Power and Energy
Concept: Different Types of 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?

Chapter: [1] Force, Work, Power and Energy
Concept: Concept of Lever
[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?

Chapter: [7] Wonders of Light 2
Concept: Refraction of Light - Refraction of Light Through a Glass Block and a Triangular Prism
[1]1.4.2

Which of the above wavelengths has a higher frequency?

Chapter: [7] Wonders of Light 2
Concept: Refraction of Light - Refraction of Light Through a Glass Block and a Triangular Prism
[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?

Chapter: [8] Motion
Concept: Uniform Circular Motion
[1]1.5.2

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

Chapter: [8] Motion
Concept: Uniform Circular Motion
[10]2
[2]2.1

The power of a lens is - 5D.

1) Find its focal length.

2) Name the type of lens.

Chapter: [2] Light
Concept: Types of Lenses (Converging and Diverging),
[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

Chapter: [2] Light
Concept: Types of Lenses (Converging and Diverging),

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

Chapter: [2] Light
Concept: Types of Lenses (Converging and Diverging),
[2]2.3
[1]2.3.1

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

Chapter: [2] Light
Concept: Total Internal Reflection - Critical Angle
[1]2.3.2

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

Chapter: [2] Light
Concept: Total Internal Reflection - Critical Angle
[2]2.4
[1]2.4.1

What do you understand by the term Scattering of light?

Chapter: [7] Wonders of Light 2
Concept: Some Natural Phenomena Due to Sunlight
[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.

Chapter: [7] Wonders of Light 2
Concept: Some Natural Phenomena Due to Sunlight
[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.

Chapter: [7] Wonders of Light 2
Concept: Refraction of Light - Refraction of Light Through a Glass Block and a Triangular Prism
[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

Chapter: [3] Sound
Concept: Sound - Reflection of Sound Waves
[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.

Chapter: [4] Electricity and Magnetism
Concept: Concepts of Pd (V), Current (I), Resistance (R) and Charge (Q).
[2]3.3
[1]3.3.1

What do you understand by the term nuclear fusion?

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

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

What do you understand by free vibrations of a body?

Chapter: [3] Sound
Concept: Sound - Forced Vibrations and Resonance
[1]3.4.2

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

Chapter: [3] Sound
Concept: Sound - Damped Vibrations
[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?

Chapter: [4] Electricity and Magnetism
Concept: Concept of Transformer
[1]3.5.2

On which type of current do transformers work?

Chapter: [4] Electricity and Magnetism
Concept: Concept of Transformer
[10]4
[2]4.1
[1]4.1.1

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

Chapter: [5] Heat
Concept: Concept of Calorimetry

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.

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

Chapter: [5] Heat
Concept: Calorimetry - Specific Heat Capacity
[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?.

Chapter: [5] Heat
Concept: Calorimetry - Specific Heat Capacity
[2]4.3

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

Chapter: [4] Electricity and Magnetism
Concept: Household Circuits – Main Circuit

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

Chapter: [4] Electricity and Magnetism
Concept: Household Circuits – Main Circuit
[2]4.4
[1]4.4.1

What are isobars?

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

Give one example of isobars.

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

State any two advantages of electromagnets over permanent magnets.

Chapter: [4] Electricity and Magnetism
Concept: Magnetic Effect of a Current
[10]5
[3]5.1

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

Chapter: [1] Force, Work, Power and Energy
Concept: Concept of Work, Energy, Power

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?

Chapter: [1] Force, Work, Power and Energy
Concept: Concept of Work, Energy, Power
[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?

Chapter: [1] Force, Work, Power and Energy
Concept: Force - Moment of a 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).

Chapter: [1] Force, Work, Power and Energy
Concept: Concept of Pulley System

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

Chapter: [1] Force, Work, Power and Energy
Concept: Concept of Pulley System

Is the above pulley system an ideal machine or not?

Chapter: [1] Force, Work, Power and Energy
Concept: Concept of Pulley System
[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?

Chapter: [6.01] Ray Optics and Optical Instruments
Concept: Total Internal Reflection
[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.

Chapter: [2] Light
Concept: Refraction of Light - Image Formation in Lenses Using Ray Diagrams - Convex Lens
[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

Chapter: [2] Light
Concept: Refraction of Light - Image Formation in Lenses Using Ray Diagrams - Convex Lens
[10]7
[3]7.1

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

Chapter: [6.01] Ray Optics and Optical Instruments
Concept: Total Internal Reflection
[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?

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

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

Chapter: [4] Electricity and Magnetism
Concept: Household Circuits - Fuses

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

Chapter: [2.01] Current Electricity
Concept: Electrical Energy and Power
[3]8.2

Find the equivalent resistance between A and B

Chapter: [4] Electricity and Magnetism
Concept: Resistances in Series and Parallel

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

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

Chapter: [4] Electricity and Magnetism
Concept: Household Circuits – Main Circuit
[10]9
[3]9.1

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

Chapter: [5] Heat
Concept: Calorimetry - Specific Heat Capacity

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

Chapter: [5] Heat
Concept: Calorimetry - Specific Heat Capacity

What is the energy absorbed during the phase change called?

Chapter: [5] Heat
Concept: Heat - Latent Heat
[3]9.2

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

Chapter: [5] Heat
Concept: Calorimetry - Specific Heat Capacity

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

Chapter: [5] Heat
Concept: Calorimetry - Specific Heat Capacity
[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.

Chapter: [5] Heat
Concept: Calorimetry - Specific Heat Capacity
[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?

Chapter: [4] Electricity and Magnetism
Concept: Magnetic Effect of a Current
[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.