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# Question Paper Solutions - Physics 2013 - 2014 ICSE Class 10

SubjectPhysics
Year2013 - 2014 (March)

Section I is compulsory. Attempt any four questions from Section II.

Marks: 80
[10]1
[2]1.1

A force is applied on (i) a non-rigid body and (ii) a rigid body. How does the effect of the force differ in the above two cases?

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

A metallic ball is hanging by a string from a fixed support. Draw a neat labelled diagram showing the forces acting on the ball and the string.

Chapter: [8] Motion
Concept: Uniform Circular Motion
[2]1.3

What is the weight of a body placed at the centre of the earth?

Chapter: [4] Force
Concept: Centre of Gravity

What is the principle of an ideal machine?

Chapter: [1] Force, Work, Power and Energy
Concept: Machines as Force Multipliers
[2]1.4

Is it possible to have an accelerated motion with a constant speed? Explain

Chapter: [8] Motion
Concept: Uniform Circular Motion
[2]1.5

When does a force do work?

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

What is the work done by the moon when it revolves around the earth?

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

Calculate the change in the Kinetic energy of a moving body if its velocity is reduced to 1/3rd of the initial velocity.

Chapter: [1] Force, Work, Power and Energy
Concept: Different Types of Energy
[2]2.2

State the energy changes in the following devices while in use: A loud speaker.

Chapter: [1] Force, Work, Power and Energy
Concept: Different Types of Energy

State the energy changes in the following devices while in use:

A glowing electric bulb.

Chapter: [1] Force, Work, Power and Energy
Concept: Different Types of Energy
[2]2.3

What is nuclear energy?

Chapter: [1] Force, Work, Power and Energy
Concept: Different Types of Energy

Name the process used for producing electricity using nuclear energy.

Chapter: [1] Force, Work, Power and Energy
Concept: Different Types of Energy
[2]2.4

State one important advantage and disadvantage each of using nuclear energy for producing electricity.

Chapter: [1] Force, Work, Power and Energy
Concept: Different Types of Energy
[2]2.5

(i) The conversion of part of the energy into an undesirable form is called ______________.
(ii) For a given height h, __________________ the length l of the inclined plane, lesser will be the effort required.

Chapter: [1] Force, Work, Power and Energy
Concept: Different Types of Energy
[10]3
[2]3.1

Draw the diagram given below and clearly show the path taken by the emergent ray.

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

What is consumed using different electrical appliances, for which electricity bills are paid?

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

Name a common device that uses electromagnets.

Chapter: [4.01] Electromagnetic Induction
Concept: Electromagnetic Induction
[2]3.3

A ray of light passes from water to air. How does the speed of light change?

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

Which colour of light travels fastest in any medium except air?

Chapter: [7] Wonders of Light 2
Concept: Refraction of Light - Refraction of Light Through a Glass Block and a Triangular Prism
[2]3.4

Name the factors affecting the critical angle for the pair of media.

Chapter: [2] Light
Concept: Total Internal Reflection - Critical Angle
[2]3.5

Name a prism required for obtaining a spectrum of Ultraviolet light.

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

Name the radiations which can be detected by a thermopile.

Chapter: [6] Modern Physics
Concept: Radioactivity and Changes in the Nucleus
[10]4
[2]4.1

Why is the colour red used as a sign of danger?

Chapter: [2] Light
Concept: Using a Triangular Prism to Produce a Visible Spectrum from White Light
[2]4.2

What are mechanical waves?

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

Name one property of waves that do not change when the wave passes from one medium to another.

Chapter: [3] Sound
Concept: Sound - Loudness, Pitch and Quality of Sound
[2]4.3

Find the equivalent resistance between points A and B

Chapter: [4] Electricity and Magnetism
Concept: Resistances in Series and Parallel
[2]4.4

50 g of metal piece at 27°C requires 2400 J of heat energy so as to attain a temperature of 327°C . Calculate the specific heat capacity of the metal.

Chapter: [5] Heat
Concept: Calorimetry - Specific Heat Capacity
[2]4.5

An electron emitter must have _____________ work function and ___________ melting point.

Chapter: [1] Force, Work, Power and Energy
Concept: Concept of Work, Energy, Power
[10]5
[4]5.1

A man having a box on his head, climbs up a slope and another man having an identical box walks the same distance on a levelled road.
Who does more work against the force of gravity and why?

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

Two forces each of 5N act vertically upwards and downwards respectively on the two ends of a uniform metre rule which is placed at its mid-point as shown in the diagram. Determine the magnitude of the resultant moment of these forces about the midpoint.

Chapter: [1] Force, Work, Power and Energy
Concept: Machines as Force Multipliers
[3]5.2

A body is thrown vertically upwards. Its velocity keeps on decreasing.
What happens to its kinetic energy as its velocity becomes zero?

Chapter: [1] Force, Work, Power and Energy
Concept: Different Types of Energy

Draw a diagram to show how a single pulley can be used so as to have its ideal M.A= 2.

Chapter: [1] Force, Work, Power and Energy
Concept: Machines as Force Multipliers
[3]5.3

Derive a relationship between mechanical advantage, velocity ratio and efficiency of a machine.

Chapter: [1] Force, Work, Power and Energy
Concept: Machines as Force Multipliers
[10]6
[4]6.1

Light passes through a rectangular glass slab and through a triangular glass prism. In what way does the direction of the two emergent beams differ and why?

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

Ranbir claims to have obtained an image twice the size of the object with a concave lens. Is he correct? Give a reason for your answer.

Chapter: [6] Wonders of Light 1
Concept: Refraction at Spherical Surfaces and by Lenses - Power of a Lens
[3]6.2

A lens forms an erect, magnified and virtual image of an object.

(i) Name the lens.
(ii) Draw a labelled ray diagram to show the image formation.

Chapter: [2] Light
Concept: Refraction of Light - Image Formation in Lenses Using Ray Diagrams - Convex Lens
[3]6.3

What is meant by power of a lens?

Chapter: [6] Wonders of Light 1
Concept: Refraction at Spherical Surfaces and by Lenses - Power of a Lens

The lens mentioned in 6(b) above is of focal length 25cm. Calculate the power of the lens.

Chapter: [6] Wonders of Light 1
Concept: Refraction at Spherical Surfaces and by Lenses - Power of a Lens
[10]7
[4]7.1

The adjacent diagram shows three different modes of vibrations P, Q and R of the same string.

(i) Which vibration will produce a louder sound and why?
(ii) The sound of which string will have maximum shrillness?
(iii) State the ratio of wavelengths of P and R.

Chapter: [3] Sound
Concept: Sound - Forced Vibrations and Resonance
[3]7.2

A type of electromagnetic wave has wavelength 50 Å .

(i) Name the wave.
(ii) What is the speed of the wave in vacuum?
(iii) State one use of this type of wave.

Chapter: [2] Light
Concept: Using a Triangular Prism to Produce a Visible Spectrum from White Light
[3]7.3

State one important property of waves used for echo depth sounding.

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

A radar sends a signal to an aircraft at a distance of 30 km away and
receives it back after 2 x 10-4 second. What is the speed of the signal?

Chapter: [7] Wonders of Light 2
Concept: Some Natural Phenomena Due to Sunlight
[10]8
[4]8.1

Two resistors of 4Ω and 6 Ω are connected in parallel to a cell to draw 0.5 A current from the cell.
(i) Draw a labelled circuit diagram showing the above arrangement.
(ii) Calculate the current in each resistor. What is an Ohmic resistor?

Chapter: [4] Electricity and Magnetism
Concept: Resistances in Series and Parallel
[3]8.2

What is an Ohmic resistor?

Chapter: [11] Current Electricity
Concept: Ohm’s Law

Two copper wires are of the same length, but one is thicker than the other.
(1) Which wire will have more resistance?
(2) Which wire will have more specific resistance?

Chapter: [11] Current Electricity
Concept: Ohm’s Law
[3]8.3

(i) Two sets A and B, of three bulbs each, are glowing in two separate rooms. When one of the bulbs in set A is fused, the other two bulbs also cease to glow. But in set B, when one bulb fuses, the other two bulbs continue to glow. Explain why this phenomenon occurs.

(ii) Why do we prefer arrangements of Set B for house circuiting?

Chapter: [4] Electricity and Magnetism
Concept: Resistances in Series and Parallel
[10]9
[4]9.1

Heat energy is supplied at a constant rate to 1OOg of ice at 0 °C. The ice is converted into water at 0° C in 2 minutes. How much time will be required to raise the temperature of water from 0 °C to 20 °C? [Given: sp. heat capacity of water = 4.2 J g-1 °C-1 , sp. latent heat of ice = 336 J g-1].

Chapter: [5] Heat
Concept: Calorimetry - Specific Heat Capacity
[3]9.2

Specific heat capacity of substance A is 3.8 J g-1K-1 whereas the  specific heat capacity of substance B is 0.4 J g-1 K-1
(i) Which of the two is a good conductor of heat?
(ii) How is one led to the above conclusion?
(iii) If substances A and B are liquids then which one would be more useful in car radiators?

Chapter: [5] Heat
Concept: Calorimetry - Specific Heat Capacity
[3]9.3

State any two measures to minimize the impact of global warming.

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

What is the Greenhouse effect?

Chapter: [5] Heat
Concept: Heat - Latent Heat
[10]10
[4]10.1

Name two factors on which the magnitude of an induced e.m.f. in the
secondary coil depends.

Chapter: [4] Electricity and Magnetism
Concept: Magnetic Effect of a Current

In the following diagram an arrow shows the motion of the coil towards the bar magnet.
(1) State in which direction the current flows, A to B or B to A?
(2) Name the law used to come to the conclusion.

Chapter: [4] Electricity and Magnetism
Concept: Magnetic Effect of a Current
[3]10.2

A nucleus ""_11^24Na  emits a beta particle to change into Magnesium (Mg)

(i) Write the symbolic equation for the process.
(ii) What are numbers 24 and 11 called?
(iii) What is the general name of ""_12^24Mg with respect to ""_11^24Na ?

Chapter: [6] Modern Physics
Concept: Radioactivity and Changes in the Nucleus
[3]10.3

In a cathode ray tube state:
(i) the purpose of covering cathode by thorium and carbon.
(ii) the purpose of the fluorescent screen.
(iii) how is it possible to increase the rate of emission of electrons.

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