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# Physics Science Paper 1 2015-2016 ICSE Class 10 Question Paper Solution

SubjectPhysics
Year2015 - 2016 (March)
Physics [Science Paper 1]
Marks: 80Date: 2016-03-15
Duration: 2h

Question 1 to Question 4 is compulsory.

Attempt any four From Question 5 to Question 10

1
1.1

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

Concept: Centre of Gravity
Chapter:

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

Concept: Force - Turning Forces Concept
Chapter: [1.03] Force
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.

Concept: Centre of Gravity
Chapter:
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.

Concept: Machines as Force Multipliers
Chapter: [1.02] Machines
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)

Concept: Calorimetry - Specific Heat Capacity
Chapter:  Heat
1.5

What do you understand by the following statements:

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

Concept: Calorimetry - Specific Heat Capacity
Chapter:  Heat

What do you understand by the following statements:

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

Concept: Calorimetry - Specific Heat Capacity
Chapter:  Heat
2
2.1

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

Concept: Calorimetry - Specific Heat Capacity
Chapter:  Heat
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.

Concept: Concept of Magnifying Glass
Chapter: [2.03] Refraction of Light Through a Lense
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. Concept: Refraction of Light - Refraction of Light Through a Glass Block and a Triangular Prism
Chapter: [2.01] Refraction of Light Through Plane Surface
2.4

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

Concept: Refraction of Light - Refraction of Light Through a Glass Block and a Triangular Prism
Chapter: [2.01] Refraction of Light Through Plane Surface

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

Concept: Refraction of Light - Refraction of Light Through a Glass Block and a Triangular Prism
Chapter: [2.01] Refraction of Light Through Plane Surface
2.5

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

Concept: Sound - Loudness, Pitch and Quality of Sound
Chapter:  Sound

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

Concept: Sound - Loudness, Pitch and Quality of Sound
Chapter:  Sound
3
3.1

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

Concept: Sound - Natural Vibrations
Chapter:  Sound
3.2

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

Concept: Sound - Loudness, Pitch and Quality of Sound
Chapter:  Sound
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. Concept: Resistance of a System of Resistors - Resistors in Series
Chapter: [4.01] Current Electricity
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.

Concept: Concepts of Pd (V), Current (I), Resistance (R) and Charge (Q).
Chapter: [4.01] Current Electricity
3.5

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

Concept: Concepts of Pd (V), Current (I), Resistance (R) and Charge (Q).
Chapter: [4.01] Current Electricity
4
4.1

State two characteristics of a good thermion emitter.

Concept: Heat - Latent Heat
Chapter:  Heat
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.

Concept: Radioactivity and Changes in the Nucleus
Chapter:  Modern Physics
4.3

Concept: Radioactivity and Changes in the Nucleus
Chapter:  Modern Physics
4.4

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

Concept: Household Circuits - Fuses
Chapter: [4.02] Electrical Power and Energy and Household Circuits
4.5

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

Concept: Concept of Transformer
Chapter: [4.03] Electro Manetism
5
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?

Concept: Work, Energy, Power - Relation with Force
Chapter: [1.01] Work, Power and Energy
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)

Concept: Concept of Pulley System
Chapter: [1.02] Machines
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.

Concept: Force - Turning Forces Concept
Chapter: [1.03] Force

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.

Concept: Concept of Pulley System
Chapter: [1.02] Machines
6
6.1

What is the principle of the method of mixtures?

Concept: Calorimetry - Principle of Method of Mixtures
Chapter:  Heat

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

Concept: Calorimetry - Principle of Method of Mixtures
Chapter:  Heat

Name the law on which the principle of mixtures is based

Concept: Calorimetry - Principle of Method of Mixtures
Chapter:  Heat
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.

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

Concept: Calorimetry - Specific Heat Capacity
Chapter:  Heat
7
7.1

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

Concept: Refraction of Light - Refraction of Light Through a Glass Block and a Triangular Prism
Chapter: [2.01] Refraction of Light Through Plane Surface

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

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

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

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

Concept: Types of Lenses (Converging and Diverging),
Chapter: [2.03] Refraction of Light Through a Lense
7.3

What do you understand by the term Scattering of light?

Concept: Some Natural Phenomena Due to Sunlight
Chapter: [2.02] Spectrum

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

Concept: Some Natural Phenomena Due to Sunlight
Chapter: [2.02] Spectrum
8
8.1

Name the waves used for echo depth sounding

Concept: Sound - Natural Vibrations
Chapter:  Sound

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

Concept: Sound - Natural Vibrations
Chapter:  Sound

Why are the Ultrasonic waves are not audible to us?

Concept: Sound - Natural Vibrations
Chapter:  Sound
8.2

What is an echo

Concept: Sound - Loudness, Pitch and Quality of Sound
Chapter:  Sound

State two conditions for an echo to take place

Concept: Sound - Loudness, Pitch and Quality of Sound
Chapter:  Sound
8.3

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

Concept: Sound - Forced Vibrations and Resonance
Chapter:  Sound

Define the Resonance phenomenon?

Concept: Sound - Forced Vibrations and Resonance
Chapter:  Sound

What do you understand by the loudness of sound?

Concept: Sound - Loudness, Pitch and Quality of Sound
Chapter:  Sound

In which units is the loudness of sound measured?

Concept: Sound - Loudness, Pitch and Quality of Sound
Chapter:  Sound
9
9.1

Which particles are responsible for current in conductors?

Concept: Electrical Energy and Power
Chapter: [4.02] Electrical Power and Energy and Household Circuits

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

Concept: Household Circuits - Earthing;
Chapter: [4.02] Electrical Power and Energy and Household Circuits

To which wire should the fuse be connected?

Concept: Household Circuits - Fuses
Chapter: [4.02] Electrical Power and Energy and Household Circuits
9.2

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

Concept: Concept of Transformer
Chapter: [4.03] Electro Manetism

What type of current is transmitted from the power station?

Concept: Concept of Transformer
Chapter: [4.03] Electro Manetism

At what voltage is this current available to our household?

Concept: Household Circuits - Safety Precautions
Chapter: [4.02] Electrical Power and Energy and Household Circuits
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.

Concept: Concepts of Pd (V), Current (I), Resistance (R) and Charge (Q).
Chapter: [4.01] Current Electricity
10
10.1

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

1) Penetrating power.

2) Lionising power

3) Biological effect

Concept: Radioactivity and Changes in the Nucleus
Chapter:  Modern Physics
10.2

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

Concept: Radioactivity and Changes in the Nucleus
Chapter:  Modern Physics

State the energy conversion taking place in a cathode ray tube

Concept: Radioactivity and Changes in the Nucleus
Chapter:  Modern Physics

Write one use of cathode ray tube.

Concept: Radioactivity and Changes in the Nucleus
Chapter:  Modern Physics
10.3

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

Concept: Radioactivity and Changes in the Nucleus
Chapter:  Modern Physics

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

Concept: Concept of Nuclear Fission and Fusion;
Chapter:  Modern Physics

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

Concept: Radioactivity and Changes in the Nucleus
Chapter:  Modern Physics

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