# Physics Set 1 2016-2017 ICSE Class 10 Question Paper Solution

Physics [Set 1]
Date & Time: 26th March 2017, 1:00 pm
Duration: 2h

Question 1 to Question 4 is compulsory

Attempt any four questions from Question 5 to Question 10.

 1
 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

Concept: Turning Effect of a Force
Chapter: [0.011000000000000001] Force
 1.2

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

Concept: Centre of Gravity
Chapter: [0.011000000000000001] Force
 1.3

Why is a jack screw provided with a long arm?

Concept: Definition of Work
Chapter: [0.012] Work, Power and Energy
 1.4

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

Concept: Work Done by the Force of Gravity (W = mgh)
Chapter: [0.012] Work, Power and Energy
 1.5

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

Concept: Lever
Chapter: [0.013000000000000001] Machines
 2
 2.1

Define heat capacity and state its SI unit.

Concept: Specific Heat Capacity
Chapter: [0.05] Heat
 2.2

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

Concept: Specific Latent Heat of Fusion of Ice
Chapter: [0.05] Heat
 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)

Concept: Specific Heat Capacity
Chapter: [0.05] Heat
 2.4

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

Concept: Real and Apparent Depth
Chapter: [0.021] Refraction of Light Through Plane Surface

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?

Concept: Refractive Index
Chapter: [0.021] Refraction of Light Through Plane Surface
 2.5

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

Concept: Total Internal Reflection
Chapter: [0.021] Refraction of Light Through Plane Surface
 3
 3.1

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

Concept: Refraction of Light Through a Rectangular Glass Slab
Chapter: [0.021] Refraction of Light Through Plane Surface
 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

Concept: Reflection of Sound
Chapter: [0.03] Sound
 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

Concept: Properties of Sounds
Chapter: [0.03] Sound
 3.4

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

Concept: Reflection of Sound
Chapter: [0.03] Sound

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

Concept: Reflection of Sound
Chapter: [0.03] Sound
 3.5

Define specific resistance and state its SI unit

Concept: Electric Potential (Electrostatic Potential) and Potential Difference
Chapter: [0.040999999999999995] Current Electricity
 4
 4.1

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

Concept: Electro-motive Force (E.M.F.) of a Cell
Chapter: [0.040999999999999995] Current Electricity
 4.2

State two causes of energy loss in a transformer.

Concept: Electric Potential (Electrostatic Potential) and Potential Difference
Chapter: [0.040999999999999995] Current Electricity
 4.3

State two characteristics of a good thermion emitter.

Concept: Latent Heat and Specific Latent Heat
Chapter: [0.05] Heat
 4.4

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

Concept: Latent Heat and Specific Latent Heat
Chapter: [0.05] Heat
 4.5

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

Chapter: [0.06] Modern Physics
 5
 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?

Concept: Centre of Gravity
Chapter: [0.011000000000000001] Force
 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.

Concept: Pulley
Chapter: [0.013000000000000001] Machines

How does uniform circular motion differ from uniform linear motion?

Concept: Uniform Circular Motion (UCM)
Chapter: [0.011000000000000001] Force

Name the process used for producing electricity using nuclear energy.

Concept: Nuclear Fission
Chapter: [0.06] Modern Physics
 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

Concept: Pulley
Chapter: [0.013000000000000001] Machines
 6
 6.1

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

Concept: Calorimetry and Calorimeter
Chapter: [0.05] Heat

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.

Concept: Specific Heat Capacity
Chapter: [0.05] Heat
 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

Concept: Specific Heat Capacity
Chapter: [0.05] Heat
 6.3

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

Chapter: [0.06] Modern Physics

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: [0.06] Modern Physics

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

Concept: Specific Latent Heat of Fusion of Ice
Chapter: [0.05] Heat
 7
 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.

Concept: Convex Lens
Chapter: [0.023] Refraction of Light Through a Lense
 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.

Concept: Total Internal Reflection
Chapter: [0.021] Refraction of Light Through Plane Surface
 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.

Concept: Total Internal Reflection
Chapter: [0.021] Refraction of Light Through Plane Surface
 8
 8.1

Name the factor that determines Loudness of the sound heard.

Concept: Properties of Sounds
Chapter: [0.03] Sound

Name the factor that determines Quality of the note

Concept: Properties of Sounds
Chapter: [0.03] Sound

Name the factor that determines Pitch of the note.

Concept: Properties of Sounds
Chapter: [0.03] Sound
 8.2

What are damped vibrations?

Concept: Damped Vibrations
Chapter: [0.03] Sound

Give one example of damped vibrations

Concept: Damped Vibrations
Chapter: [0.03] Sound

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.

Concept: Properties of Sounds
Chapter: [0.03] Sound
 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

Concept: Reflection of Sound
Chapter: [0.03] Sound

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?

Concept: Reflection of Sound
Chapter: [0.03] Sound
 9
 9.1

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

Concept: Colour Coding of Live, Neutral, and Earth Wires
Chapter: [0.042] Electrical Power and Energy and Household Circuits

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

Concept: Electric Switch
Chapter: [0.042] Electrical Power and Energy and Household Circuits
 9.2

Which particles are responsible for current in conductors?

Concept: Electrical Power
Chapter: [0.042] 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: Earthing (Grounding)
Chapter: [0.042] Electrical Power and Energy and Household Circuits

To which wire should the fuse be connected?

Concept: Electric Fuse
Chapter: [0.042] Electrical Power and Energy and Household Circuits
 9.3

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

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

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?

Concept: Electrical Power
Chapter: [0.042] Electrical Power and Energy and Household Circuits
 10
 10.1

Answer the following questions based on a hot cathode ray tube

Name the charged particles

Chapter: [0.06] Modern Physics

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

State the approximate voltage used to heat the filament

Chapter: [0.06] Modern Physics

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: [0.06] Modern Physics
 10.2

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

Chapter: [0.06] Modern Physics
 10.3

What are free electrons?

Chapter: [0.06] Modern Physics

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

Chapter: [0.06] Modern Physics

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

Chapter: [0.06] Modern Physics

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