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# Question Paper Solutions - Physics 2016 - 2017 ICSE Class 10

SubjectPhysics
Year2016 - 2017 (March)

Question 1 to Question 4 is compulsory

Attempt any four questions from Question 5 to Question 10.

Marks: 80
[10]1
[2]1.1

A brass ball is hanging from a stiff cotton thread. Draw a neat labeled diagram showing the forces acting on the brass ball and cotton thread

Chapter: [1] Force, Work, Power and Energy
Concept: Force - Turning Forces Concept
[2]1.2

The distance between two bodies is doubled. How is the magnitude of the gravitational force between them affected?

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

Why is a jack screw provided with a long arm?

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

If the power of a motor is 100 kW, at what speed can it raise a load of 50,000 N?

Chapter: [1] Force, Work, Power and Energy
Concept: Work, Energy, Power - Relation with Force
[2]1.5

Which class of lever will always have MA > 1 and why?

Chapter: [1] Force, Work, Power and Energy
Concept: Concept of Lever
[10]2
[2]2.1

Define heat capacity and state its SI unit.

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

Why is the base of a cooking pan generally made thick?

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

A solid of mass 50 g at 150 °C is placed in 100 g of water at 11 °C when the final temperature recorded is 20 °C. Find the specific heat capacity of the solid. (specific heat capacity of water = 4.2 J/g °C)

Chapter: [5] Heat
Concept: Calorimetry - Specific Heat Capacity
[2]2.4

How is the refractive index of a material related to real and apparent depth?

Chapter: [2] Light
Concept: Refraction of Light - Qualitative Treatment of Simple Applications - Real and Apparent Depth of Objects in Water

How is the refractive index of a material related to the velocity of light in vacuum or air and the velocity of light in a given medium?

Chapter: [2] Light
Concept: Refraction of Light - Qualitative Treatment of Simple Applications - Real and Apparent Depth of Objects in Water
[2]2.5

State the conditions required for total internal reflection of light to take place

Chapter: [6.01] Ray Optics and Optical Instruments
Concept: Total Internal Reflection
[10]3
[2]3.1

Draw a ray diagram to show the refraction of a monochromatic ray through a prism when it suffers minimum deviation

Chapter: [7] Wonders of Light 2
Concept: Refraction of Light - Refraction of Light Through a Glass Block and a Triangular Prism
[2]3.2

The human ear can detect continuous sounds in the frequency range from 20 Hz to 20,000 Hz. Assuming that the speed of sound in air is 330 ms1 for all frequencies; calculate the wavelengths corresponding to the given extreme frequencies of the audible range

Chapter: [3] Sound
Concept: Sound - Reflection of Sound Waves
[2]3.3

An enemy plane is at a distance of 300 km from a radar. In how much time the radar will be able to detect the plane? Take velocity of radio waves as 3 x 108 ms-1

Chapter: [3] Sound
Concept: Sound - Loudness, Pitch and Quality of Sound
[2]3.4

How is the frequency of a stretched string related to its length?

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

How is the frequency of a stretched string related it’s tension?

Chapter: [3] Sound
Concept: Sound - Reflection of Sound Waves
[2]3.5

Define specific resistance and state its SI unit

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

An electric bulb of 300 draws a current of 0.4 A. Calculate the power of the bulb and the potential difference at its ends

Chapter: [4.01] Effects of Current
Concept: Electric Potential Difference
[2]4.2

State two causes of energy loss in a transformer

Chapter: [4.01] Effects of Current
Concept: Electric Potential Difference
[2]4.3

State two characteristics of a good thermion emitter.

Chapter: [5] Heat
Concept: Heat - Latent Heat
[2]4.4

State two factors upon which the rate of emission of thermions depends.

Chapter: [5] Heat
Concept: Heat - Latent Heat
[2]4.5

When does the nucleus of an atom tend to be radioactive?

Chapter: [6] Modern Physics
Concept: Radioactivity and Changes in the Nucleus
[10]5
[3]5.1

A uniform half meter rule balances horizontally on a knife-edge at 29 cm mark when a weight of 20 gf is suspended from one end

1) Draw a diagram of the arrangement

2) What is the weight of the half meter rule?

Chapter: [4] Force
Concept: Centre of Gravity
[3]5.2

A boy uses a single fixed pulley to lift a load of 50 kgf to some height. Another boy uses a single movable pulley to lift the same load to the same height. Compare the effort applied by them. Give a reason to support your answer.

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

How does uniform circular motion differ from uniform linear motion?

Chapter: [8] Motion
Concept: Uniform Circular Motion

Name the process used for producing electricity using nuclear energy.

Chapter: [6] Modern Physics
Concept: Concept of Nuclear Fission and Fusion;
[4]5.3

A pulley system with VR = 4 is used to lift a load of 175 kgf through a vertical height of 15 m. The effort required is 50 kgf in the downward direction.

(g = 10 N kg-1)

Calculate

1) Distance moved by the effort

2) Work done by the effort

3) M.A. of the pulley system

4) Efficiency of the pulley system

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

How is the transference of heat energy by radiation prevented in a calorimeter?

Chapter: [5] Heat
Concept: Concept of Calorimetry

You have a choice of three metals A, B, and C, of specific heat capacities 900 Jkg-1 °C-1, 380 Jkg-1 °C-1 and 460 Jkg-1 °C-1 respectively, to make a calorimeter. Which material will you select? Justify your answer.

Chapter: [5] Heat
Concept: Calorimetry - Specific Heat Capacity
[3]6.2

Calculate the mass of ice needed to cool 150g of water contained in a calorimeter of mass 50 g at 32 °C such that the final temperature is 5 °C.

Specific heat capacity of calorimeter = 0.4J/g °C

Specific heat capacity of water = 4.2 J/g°C

Latent heat capacity of ice = 330 J/g

Chapter: [5] Heat
Concept: Calorimetry - Specific Heat Capacity
[4]6.3

Name the radiations which are absorbed by greenhouse gases in the earth’s atmosphere.

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

A radiation X is focused by a particular device on the bulb of a thermometer and mercury in the thermometer shows a rapid increase. Name the radiation X

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

Name two factors on which the heat energy liberated a body depend.

Chapter: [5] Heat
Concept: Heat - Loss and Gain of Heat Involving Change of State for Fusion Only
[10]7
[3]7.1

A lens forms an upright and diminished image of an object when the object is placed at the focal point of the given lens.

1) Name the lens

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

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

A ray of light travels from water to air as shown in the diagram given below :

1) Copy the diagram and complete the path of the way. Given the critical angle for water is 48°.

2) State the condition so that internal reflection occurs in the above diagram.

Chapter: [2] Light
Concept: Total Internal Reflection - Critical Angle
[4]7.3

The diagram below shows a point source P inside a water container. Four rays A, B, C, D starting from the source P are shown up to the water surface

1) Show in the diagram the path of these rays after striking the water surface.

The Critical Angle for the water-air surface is 48°.

2) Name the phenomenon which the rays B and D exhibit.

Chapter: [2] Light
Concept: Total Internal Reflection - Critical Angle
[10]8
[3]8.1

Name the factor that determines Loudness of the sound heard.

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

Name the factor that determines Quality of the note

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

Name the factor that determines Pitch of the note.

Chapter: [3] Sound
Concept: Sound - Loudness, Pitch and Quality of Sound
[3]8.2

What are damped vibrations?

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

Give one example of damped vibrations

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

Name the phenomenon that causes a loud sound when the stem of a vibrating tuning fork is kept pressed on the surface of a table.

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

A wire of length 80 cm has a frequency of 256 Hz. Calculate the length of a similar wire under similar tension, which will have frequency 1024 Hz

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

A certain sound has a frequency of 256 hertz and a wavelength of 1.3 m.

1) Calculate the speed with which this sound travels

2) What difference would be felt by a listener between the above sound and another sound traveling at the same speed, but of wavelength 2.6 m?

Chapter: [3] Sound
Concept: Sound - Reflection of Sound Waves
[10]9
[3]9.1

Name the color code of the wire which is connected to the metallic body of an appliance.

Chapter: [4] Electricity and Magnetism
Concept: Household Circuits - Colour Coding of Wires

Draw the diagram of a dual control switch when the appliance is switched ‘ON’.

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

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
[4]9.3

Explain the meaning of the student 'current rating of a fuse is 5A'.

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

In the transmission of power the voltage of power generated at the generating stations is stepped up from 11kV to 132 kV before it is transmitted. Why?

Chapter: [2.01] Current Electricity
Concept: Electrical Energy and Power
[10]10
[3]10.1

Answer the following questions based on a hot cathode ray tube

Name the charged particles

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

Answer the following questions based on a hot cathode ray tube.

State the approximate voltage used to heat the filament

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

Answer the following questions based on a hot cathode ray tube.

What will happen to the beam when it passes through the electric field?

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

State three factors on which the rate of emission of electrons from a metal surface depends

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

What are free electrons?

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

Why do Free electrons not leave the metal surface on their own

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

How can they be made to leave the metal surface? (State any two ways)

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