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# Question Paper Solutions - Physics 2015 - 2016 ICSE Class 10

SubjectPhysics
Year2015 - 2016 (March)

Question 1 to Question 4 is compulsory.

Attempt any four From Question 5 to Question 10

Marks: 80
[10]1
[2]1.1

Give an example of a non-contact force which is always of attractive nature

Chapter: [4] Force
Concept: Centre of Gravity

How does the magnitude of this non-contact force on the two bodies depend on the distance of separation between them?

Chapter: [1.01] Force
Concept: Force - Turning Forces Concept
[2]1.2

A boy weighing 40 kgf climbs up a stair of 30 steps each 20 cm high in 4 minutes and a girl weighing 30 kgf does the same in 3 minutes. Compare:

1) The work done by them.

2) The power developed by them.

Chapter: [4] Force
Concept: Centre of Gravity
[2]1.3

With reference to the terms Mechanical Advantage, Velocity Ratio and efficiency of a machine, name and define the term that will not change for the machine of a given design.

Chapter: [1.03] Machines
Concept: Machines as Force Multipliers
[2]1.4

Calculate the mass of ice required to lower the temperature of 300 g of water 40°C to water at 0°C.

(Specific latent heat of ice = 336 J/g, the Specific heat capacity of water = 4.2J/g°C)

Chapter: [5] Heat
Concept: Calorimetry - Specific Heat Capacity
[2]1.5

What do you understand by the following statements:

The heat capacity of the body is 60JK-1.

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

What do you understand by the following statements:

The specific heat capacity of lead is 130 Jkg-1K-1.

Chapter: [5] Heat
Concept: Calorimetry - Specific Heat Capacity
[10]2
[2]2.1

State two factors upon which the heat absorbed by a body depends

Chapter: [5] Heat
Concept: Calorimetry - Specific Heat Capacity
[2]2.2

A boy uses the blue color of light to find the refractive index of glass. He then repeats the experiment using the red color of light. Will the refractive index be the same or different in the two cases? Give a reason to support your answer.

Chapter: [2] Light
Concept: Concept of Magnifying Glass
[2]2.3

Copy the diagram given below and complete the path of the light ray till it emerges out of the prism. The critical angle of glass is 42°. In your diagram mark the angles wherever necessary.

Chapter: [7] Wonders of Light 2
Concept: Refraction of Light - Refraction of Light Through a Glass Block and a Triangular Prism
[2]2.4

State the dependence of angle of deviation On the refractive index of the material of the prism.

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

State the dependence of angle of deviation On the wavelength of light

Chapter: [7] Wonders of Light 2
Concept: Refraction of Light - Refraction of Light Through a Glass Block and a Triangular Prism
[2]2.5

The ratio of amplitude of two waves is 3:4. What is the ratio of their loudness?

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

The ratio of the amplitude of two waves is 3:4. What is the ratio of their Frequencies?

Chapter: [3] Sound
Concept: Sound - Loudness, Pitch and Quality of Sound
[10]3
[2]3.1

State the ways by which the frequency of transverse vibrations of a stretch string can be increased

Chapter: [3] Sound
Concept: Sound - Natural Vibrations
[2]3.2

What is meant by noise pollution? Name one source of sound causing noise pollution

Chapter: [3] Sound
Concept: Sound - Loudness, Pitch and Quality of Sound
[2]3.3

The V-I graph for a series combination and for a parallel combination of two resistors is shown in the figure below. Which of the two A or B. represents the parallel combination? Give reasons for your answer.

Chapter: [4] Electricity and Magnetism
Concept: Resistances in Series and Parallel
[2]3.4

The music system draws a current of 400 mA when connected to a 12 V battery.

1) What is the resistance of the music system?

2) The music system if left playing for several hours and finally the battery voltage drops to 320 mA and the music system stops playing when the current.

Chapter: [4] Electricity and Magnetism
Concept: Concepts of Pd (V), Current (I), Resistance (R) and Charge (Q).
[2]3.5

Calculate the quantity of heat produced in a 20 Ω resistor carrying 2.5 A current in 5 minutes.

Chapter: [4] Electricity and Magnetism
Concept: Concepts of Pd (V), Current (I), Resistance (R) and Charge (Q).
[10]4
[2]4.1

State two characteristics of a good thermion emitter.

Chapter: [5] Heat
Concept: Heat - Latent Heat
[2]4.2

An element ""_ZS^A decays to ""_85R^222 after emitting 2 α particles and 1 β particle.

Find the atomic number and atomic mass of the element S.

Chapter: [6] Modern Physics
Concept: Radioactivity and Changes in the Nucleus
[2]4.3

Chapter: [6] Modern Physics
Concept: Radioactivity and Changes in the Nucleus
[2]4.4

State the characteristics required in a material to be used as an effective fuse wire.

Chapter: [4] Electricity and Magnetism
Concept: Household Circuits - Fuses
[2]4.5

Which coil of a step up transformer is made thicker and why?

Chapter: [4] Electricity and Magnetism
Concept: Concept of Transformer
[10]5
[3]5.1

A stone of mass m is rotated in a circular path with a uniform speed by tying a strong string with the help of your hand. Answer the following questions

1) Is the stone moving with a uniform or variable speed?

2) Is the stone moving with a uniform acceleration? In which direction does the acceleration act?

3) What kind of force acts on the hand and state its direction?

Chapter: [1.02] Work, Power and Energy
Concept: Work, Energy, Power - Relation with Force
[3]5.2

From the diagram given below. answer the question that follows:

1) What kind of pulleys are A and B?

2) State the purpose of pulley B.

3) What effort has to be applied at C just raise the load L = 20 kgf?

(Neglect the weight of pulley A and friction)

Chapter: [1.03] Machines
Concept: Concept of Pulley System
[4]5.3

An effort is applied on the bigger wheel of a gear having 32 teeth. It is used to turn a wheel of 8 teeth. Where it is used.

Chapter: [1.01] Force
Concept: Force - Turning Forces Concept

A pulley system has three pulleys. A load of 120 N is overcome by applying an effort of 50N. Calculate the Mechanical Advantage and Efficiency of this system.

Chapter: [1.03] Machines
Concept: Concept of Pulley System
[10]6
[3]6.1

What is the principle of the method of mixtures?

Chapter: [5] Heat
Concept: Calorimetry - Principle of Method of Mixtures

What is the other name given to the principle of the mixtures?

Chapter: [5] Heat
Concept: Calorimetry - Principle of Method of Mixtures

Name the law on which the principle of mixtures is based

Chapter: [5] Heat
Concept: Calorimetry - Principle of Method of Mixtures
[3]6.2

Some ice is heated at a constant rate, and its temperature is recorded after every few seconds, till steam is formed at 100C. Draw a temperature-time graph to represent the change. Label the two-phase changes in your graph.

Chapter: [5] Heat
Concept: Heat - Loss and Gain of Heat Involving Change of State for Fusion Only
[4]6.3

A copper vessel of mass 100 g contains 150 g of water at 50°C. How much ice is needed to cool it to 5°C?

Given: Specific heat capacity of copper = 0.4 Jg-1 °C-1

The Specific heat capacity of water = 4.2 Jg-1 °C-1

The Specific latent heat of fusion ice = 336 Jg-1

Chapter: [5] Heat
Concept: Calorimetry - Specific Heat Capacity
[10]7
[3]7.1

Write a relationship between the angle of incidence and angle of refractions for a given pair of media

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

When a ray of light enters from one medium to another having different optical densities it bends. Why does this phenomenon occur?

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

Write one condition where it does not bend when entering a medium of different optical density.

Chapter: [2] Light
Concept: Refraction of Light - Image Formation in Lenses Using Ray Diagrams - Convex Lens
[3]7.2

A lens produces a virtual image between the object and the lens.

1) Name the lens.

2) Draw a ray diagram to show the formation of this image.

Chapter: [2] Light
Concept: Types of Lenses (Converging and Diverging),
[4]7.3

What do you understand by the term Scattering of light?

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

Which color of white light is scattered the least and why?

Chapter: [7] Wonders of Light 2
Concept: Some Natural Phenomena Due to Sunlight
[10]8
[3]8.1

Name the waves used for echo depth sounding

Chapter: [3] Sound
Concept: Sound - Natural Vibrations

Give one reason for Ultrasonic waves use for echo depth sounding purpose.

Chapter: [3] Sound
Concept: Sound - Natural Vibrations

Why are the Ultrasonic waves are not audible to us?

Chapter: [3] Sound
Concept: Sound - Natural Vibrations
[3]8.2

What is an echo

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

State two conditions for an echo to take place

Chapter: [3] Sound
Concept: Sound - Loudness, Pitch and Quality of Sound
[4]8.3

Name the phenomenon involved in tunning a radio set to a particular station

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

Define the Resonance phenomenon?

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

What do you understand by the loudness of sound?

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

In which units is the loudness of sound measured?

Chapter: [3] Sound
Concept: Sound - Loudness, Pitch and Quality of Sound
[10]9
[3]9.1

Which particles are responsible for current in conductors?

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

To which wire of a cable in a power circuit should the metal case of geyser be connected.

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

To which wire should the fuse be connected?

Chapter: [4] Electricity and Magnetism
Concept: Household Circuits - Fuses
[3]9.2

Name the transformer used in the power transmitting station of a power plant.

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

What type of current is transmitted from the power station?

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

At what voltage is this current available to our household?

Chapter: [4] Electricity and Magnetism
Concept: Household Circuits - Safety Precautions
[4]9.3

A battery of emf 12 V and internal resistance 2 Ω is connected with two resistors A and B of resistance 4 Ω and 6 Ω respectively joined in series.

Find:

1) Current in the circuit

2) The terminal voltage of the cell

3) The potential difference across 6Ω Resistor

4) Electrical energy spent per minute in the 4Ω resistor.

Chapter: [4] Electricity and Magnetism
Concept: Concepts of Pd (V), Current (I), Resistance (R) and Charge (Q).
[10]10
[3]10.1

Arrange α, β, and γ rays in ascending order with respect to their

1) Penetrating power.

2) Lionising power

3) Biological effect

Chapter: [6] Modern Physics
Concept: Radioactivity and Changes in the Nucleus
[3]10.2

In a cathode ray tube, what is the function of anode?

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

State the energy conversion taking place in a cathode ray tube

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

Write one use of cathode ray tube.

Chapter: [6] Modern Physics
Concept: Radioactivity and Changes in the Nucleus
[4]10.3

Represent the change in the nucleus of a radioactive element when a β particle is emitted.

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

What is the name given to elements with the same mass number and different atomic number

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

Under which conditions does the nucleus of an atom tend to radioactive?

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

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