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Physics Science Paper 1 2014-2015 ICSE Class 10 Question Paper Solution

Physics [Science Paper 1]
Marks: 80Academic Year: 2014-2015
Date: March 2015

Question 1 to Question 4 is Compulsory.

Attempt any Four From Question 5 to Question 10


[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?

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

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

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

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

Concept: Magnetic Effect of a Current
Chapter: [0.043] Electro Manetism
[2]1.3

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

Concept: Centre of Gravity
Chapter:

What is the SI unit of the moment of force?

Concept: Concept of Force - Moment of a Force
Chapter: [0.013000000000000001] Force
[2]1.4

Name the factors affecting the turning effect of a body

Concept: Concept of Force - Turning Forces Concept
Chapter: [0.013000000000000001] Force
[2]1.5

Define equilibrium.

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

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

Concept: Concept of Force - Forces in Equilibrium
Chapter: [0.013000000000000001] Force
[10]2
[2]2.1

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

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

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

Concept: Work, Energy, Power - Relation with Force
Chapter: [0.011000000000000001] Work, Power and Energy
[2]2.2

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

Concept: Heat - Loss and Gain of Heat Involving Change of State for Fusion Only
Chapter: [0.05] Heat

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

Concept: Heat - Loss and Gain of Heat Involving Change of State for Fusion Only
Chapter: [0.05] Heat
[2]2.3

A scissor is a _________ multiplier

Concept: Machines as Force Multipliers
Chapter: [0.012] Machines

1 kWh = ________ J

Concept: Electrical Energy and Power
Chapter: [0.042] Electrical Power and Energy and Household Circuits
[2]2.4

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

Concept: Centre of Gravity
Chapter:
[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.

Concept: Work, Energy, Power - Relation with Force
Chapter: [0.011000000000000001] Work, Power and Energy
[10]3
[2]3.1

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

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

Name a common device where a gear train is used

Concept: Concept of Work, Energy, Power
Chapter: [0.011000000000000001] Work, Power and Energy
[2]3.2

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

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]3.3

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

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

Where can a body execute free vibrations?

Concept: Concept of Force - Moment of a Force
Chapter: [0.013000000000000001] Force
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[2]3.4

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

Concept: Internal Resistance
Chapter: [0.040999999999999995] Current Electricity

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

Concept: Household Circuits - Fuses
Chapter: [0.042] Electrical Power and Energy and Household Circuits
[2]3.5

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

Concept: Electromagnetic Spectrum
Chapter: [0.022000000000000002] Spectrum

State an additional use of the X-rays waves

Concept: Electromagnetic Spectrum
Chapter: [0.022000000000000002] 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.

Concept: Heat - Loss and Gain of Heat Involving Change of State for Fusion Only
Chapter: [0.05] Heat
[2]4.2

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

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

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

Concept: Magnetic Effect of a Current
Chapter: [0.043] Electro Manetism
[2]4.3

Find the equivalent resistance between points A and B.

Concept: Resistance of a System of Resistors - Resistors in Series
Chapter: [0.040999999999999995] Current Electricity [0.042] Electrical Power and Energy and Household Circuits
[2]4.4

Give two similarities an AC generator and a DC motor

Concept: Electromagnetic Induction
Chapter: [0.043] Electro Manetism
[2]4.5

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

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

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

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

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

Concept: Work, Energy, Power - Relation with Force
Chapter: [0.011000000000000001] Work, Power and Energy
[4]5.2

Name the physical quantity measured in terms of horsepower.

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

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.

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

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

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

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

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

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

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

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

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

Why does sun appear red at sunrise and sunset?

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

Name the subjective property of light related to its wavelength

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

Concept: Applications of Refraction of Light
Chapter: [0.021] Refraction of Light Through Plane Surface
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[10]7
[2]7.1

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

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

Name the characteristic of sound in relation to its waveform

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

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

Concept: Concept of Sound - Forced Vibrations and Resonance
Chapter: [0.03] Sound
[10]8
[3]8.1

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

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

At what frequency is AC supplied to residential houses?

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

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

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

Concept: Ohm’s Law
Chapter: [0.040999999999999995] Current Electricity
[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?

Concept: Internal Resistance
Chapter: [0.040999999999999995] Current Electricity
[10]9
[2]9.1

Name a gas caused by the Greenhouse effect

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

Which property of water makes it an effective coolant?

Concept: Calorimetry - Specific Heat Capacity
Chapter: [0.05] Heat
[4]9.2

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

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

What is the principle of Calorimetry?

Concept: Concept of Calorimetry
Chapter: [0.05] Heat

Name the law on which principle of Calorimetry is based

Concept: Concept of Calorimetry
Chapter: [0.05] Heat

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

Concept: Heat - Latent Heat
Chapter: [0.05] Heat [6] Modern Physics
[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

Concept: Calorimetry - Specific Heat Capacity
Chapter: [0.05] Heat
[10]10
[2]10.1

What is thermionic emission?

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

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

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

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

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

State any two precautions to be taken while handling radioactive substances

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

Concept: Concept of Nuclear Fission and Fusion;
Chapter: [6] Modern Physics
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CISCE previous year question papers Class 10 Physics with solutions 2014 - 2015

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