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# Question Paper Solutions - Physics 2014 - 2015 ICSE Class 10

SubjectPhysics
Year2014 - 2015 (March)

Question 1 to Question 4 is Compulsory.

Attempt any Four From Question 5 to Question 10

Marks: 80
[10]1
[2]1.1

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

1) Name the force exerted by the table top

2) What is the direction of the force?

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

Name one factor that affects the lateral displacement of light as it passes through a rectangular glass slab.

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

On reversing the direction of the current in a wire, the magnetic field produced by it gets ____________.

Chapter: [4] Electricity and Magnetism
Concept: Magnetic Effect of a Current
[2]1.3

On what factor does the position of the center of gravity of a body depend?

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

What is the SI unit of the moment of force?

Chapter: [1] Force, Work, Power and Energy
Concept: Force - Moment of a Force
[2]1.4

Name the factors affecting the turning effect of a body

Chapter: [1] Force, Work, Power and Energy
Concept: Force - Turning Forces Concept
[2]1.5

Define equilibrium.

Chapter: [1] Force, Work, Power and Energy
Concept: Force - Forces in Equilibrium

In a beam balance when the beam is balanced in a horizontal position, it is in ______ equilibrium.

Chapter: [1] Force, Work, Power and Energy
Concept: Force - Forces in Equilibrium
[10]2
[2]2.1

How is work done by a force measured when the force is in the direction of displacement?

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

How is work done by a force measured when the force is in an angle to the direction of displacement?

Chapter: [1] Force, Work, Power and Energy
Concept: Work, Energy, Power - Relation with Force
[2]2.2

State the energy in the following while in use: Burning of a candle.

Chapter: [5] Heat
Concept: Heat - Loss and Gain of Heat Involving Change of State for Fusion Only

State the energy in the following while in use: A steam engine.

Chapter: [5] Heat
Concept: Heat - Loss and Gain of Heat Involving Change of State for Fusion Only
[2]2.3

A scissor is a _________ multiplier

Chapter: [1] Force, Work, Power and Energy
Concept: Machines as Force Multipliers

1 kWh = ________ J

Chapter: [2] Current Electricity
Concept: Electrical Energy and Power
[2]2.4

Explain the motion of a planet around the Sun in a circular path.

Chapter: [1] Force, Work, Power and Energy
Concept: Centre of Gravity
[2]2.5

Rajan exerts a force of 150 N in pulling a cart at a constant speed of 10 m/s. Calculate the power exerted.

Chapter: [1] Force, Work, Power and Energy
Concept: Work, Energy, Power - Relation with Force
[10]3
[2]3.1

Give the expression for mechanical advantage of an inclined plane in terms of the length of an inclined plane.

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

Name a common device where a gear train is used

Chapter: [1] Force, Work, Power and Energy
Concept: Concept of Work, Energy, Power
[2]3.2

The speed of light in glass is 2 × 105 km/s. What is the refractive index of glass?

Chapter: [2] Light
Concept: Refraction of Light - Refraction of Light Through a Glass Block and a Triangular Prism
[2]3.3

Draw a graph between displacement and the time for a body executing free vibrations

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

Where can a body execute free vibrations?

Chapter: [1] Force, Work, Power and Energy
Concept: Force - Moment of a Force
[2]3.4

What happens to the resistivity of semiconductor with the increase of temperature?

Chapter: [4] Electricity and Magnetism
Concept: Internal Resistance

For a fuse, higher the current rating ________ is the fuse wire.

Chapter: [4] Electricity and Magnetism
Concept: Household Circuits - Fuses
[2]3.5

Name the high energetic invisible electromagnetic waves which help in the study of the structure of crystals

Chapter: [2] Light
Concept: Electromagnetic Spectrum

State an additional use of the X-rays waves

Chapter: [2] Light
Concept: Electromagnetic Spectrum
[10]4
[2]4.1

Rishi is surprised when he sees water boiling at 115°C in a container. Give reasons as to why water can boil at the above temperature.

Chapter: [5] Heat
Concept: Heat - Loss and Gain of Heat Involving Change of State for Fusion Only
[2]4.2

Why does a current carrying, freely suspended solenoid rest along a particular direction?

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

State the direction in which current-carrying freely suspended solenoid rests

Chapter: [4] Electricity and Magnetism
Concept: Magnetic Effect of a Current
[2]4.3

Find the equivalent resistance between points A and B.

Chapter: [4] Electricity and Magnetism
Concept: Resistances in Series and Parallel
[2]4.4

Give two similarities an AC generator and a DC motor

Chapter: [4] Electricity and Magnetism
Concept: Electromagnetic Induction
[2]4.5

Why is a cathode ray tube evacuated to a low pressure?

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

What happens if the negative potential is changed on a grid?

Chapter: [6] Modern Physics
Concept: Radioactivity and Changes in the Nucleus
[10]5
[2]5.1

Draw a simplified diagram of a lemon crusher, indicting of load and effort

Chapter: [1] Force, Work, Power and Energy
Concept: Work, Energy, Power - Relation with Force
[4]5.2

Name the physical quantity measured in terms of horsepower.

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

A nut is opened by a wrench of length 20 cm. If the least force required is 2N, find the moment of force needed to loosen the nut.

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

Explain briefly why the work done by a fielder when he takes a catch in a cricket match is negative.

Chapter: [1] Force, Work, Power and Energy
Concept: Concept of Work, Energy, Power
[4]5.3

A block and tackle system has V.R. = 5.

Draw a neat labeled diagram of a system indicating the direction of its load and effort

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

Rohan exerts a pull of 150 kgf. What is the maximum load he can raise with this pulley system if its efficiency = 75%?

Chapter: [1] Force, Work, Power and Energy
Concept: Concept of Pulley System
[10]6
[3]6.1

Where should an object be placed so that a real and inverted image of the same size as the object is obtained using a convex lens?

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

Draw a ray diagram to show the formation of the image of an object be placed so that a real and inverted image of the same size as the object is obtained using a convex lens

Chapter: [2] Light
Concept: Refraction of Light - Image Formation in Lenses Using Ray Diagrams - Convex Lens
[3]6.2

Why does sun appear red at sunrise and sunset?

Chapter: [2] Light
Concept: Some Natural Phenomena Due to Sunlight

Name the subjective property of light related to its wavelength

Chapter: [2] Light
Concept: Some Natural Phenomena Due to Sunlight
[4]6.3

Jatin puts a pencil into a glass container having water and is surprised o see the pencil in a different state.

1) What change is observed in the appearance of the pencil?

2) Name the phenomenon responsible for the change.

3) Draw a ray diagram showing how the eye sees the pencil.

Chapter: [2] Light
Concept: Refraction of Light - Qualitative Treatment of Simple Applications - Apparent Bending of Sticks in Water
[10]7
[2]7.1

State the safe limit of sound level in terms of decibel for human hearing.

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

Name the characteristic of sound in relation to its waveform

Chapter: [3] Sound
Concept: Sound - Reflection of Sound Waves
[3]7.2

A person standing between two vertical cliffs and 480 m from the nearest cliff shouts. He hears the first echo after 3s and the second echo 2s later. Calculate:

1)The speed of sound.

2) The distance of the other cliff from the person

Chapter: [3] Sound
Concept: Sound - Loudness, Pitch and Quality of Sound
[5]7.3

In the diagram below, A, B, C, D are four pendulums suspended from the same elastic string PQ. The length of A and C are equal to each other while the length of pendulum B is smaller than that of D. Pendulum A is set into a mode of vibrations

1) Name the type of vibrations taking place in pendulums B and D?

2) What is the state of pendulum C?

3) State the reason for the type of vibrations in pendulum B and C.

Chapter: [3] Sound
Concept: Sound - Forced Vibrations and Resonance
[10]8
[3]8.1

Name the device used to increase the voltage at a generating station

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

At what frequency is AC supplied to residential houses?

Chapter: [2] Current Electricity
Concept: Electrical Energy and Power

Name the wire in a household electrical circuit to which the switch is connected

Chapter: [4] Electricity and Magnetism
Concept: Household Circuits - Switches
[3]8.2

The relationship between the potential difference and the current in a conductor is stated in the form of a law.

1) Name the law.

2) What does the slope of V-I graph for a conductor represent?

3) Name the material used for making the connecting wire.

Chapter: [2] Current Electricity
Concept: Ohmâ€™s Law
[4]8.3

A cell of Emf 2 V and internal resistance 1.2 Ω is connected with an ammeter of resistance 0.8 Ω and two resistors of 4.5 Ω and 9 Ω as shown in the diagram below:

1) What would be the reading on the Ammeter?

2) What is the potential difference across the terminals of the cell?

Chapter: [4] Electricity and Magnetism
Concept: Internal Resistance
[10]9
[2]9.1

Name a gas caused by the Greenhouse effect

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

Which property of water makes it an effective coolant?

Chapter: [5] Heat
Concept: Calorimetry - Specific Heat Capacity
[4]9.2

Water in lakes and ponds do not freeze at once in cold countries. Give a reason is support of your answer.

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

What is the principle of Calorimetry?

Chapter: [5] Heat
Concept: Concept of Calorimetry

Name the law on which principle of Calorimetry is based

Chapter: [5] Heat
Concept: Concept of Calorimetry

State the effect of an increase of impurities on the melting point of ice.

Chapter: [5] Heat
Concept: Heat - Latent Heat
[4]9.3

A refrigerator converts 100 g of water at 20°C to ice at -10°C in 35 minutes. Calculate the average rate of heat extraction in terms of watts.

Given: Specific heat capacity of ice = 2.1 J g-1°C-1

Specific heat capacity of water = 4.2 J g-1°C-1

Specific latent heat of fusion of ice = 336 J g-1

Chapter: [5] Heat
Concept: Calorimetry - Specific Heat Capacity
[10]10
[2]10.1

What is thermionic emission?

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

Name the unit in which the work function of a metal is expressed.

Chapter: [6] Modern Physics
Concept: Radioactivity and Changes in the Nucleus
[5]10.2

Complete the diagram as given above by drawing the deflection of radioactive radiations in an electric field

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

State any two precautions to be taken while handling radioactive substances

Chapter: [6] Modern Physics
Concept: Radioactivity and Changes in the Nucleus
[3]10.3

An atomic nucleus A is composed of 84 protons and 128 neutrons

1) The nucleus A emits an alpha particle and is transformed into nucleus B. What is the composition of nucleus B?

2) The nucleus B emits a beta particle is transformed into nucleus C. What is the composition of nucleus C?

3) Does the composition of nucleus C change if it emits gamma radiations?

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