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# Physics Science Paper 1 2013-2014 ICSE Class 10 Question Paper Solution

Course
Physics [Science Paper 1]
Date: March 2014

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

1
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?

Concept: Force - Turning Forces Concept
Chapter: [0.013000000000000001] Force
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.

Concept: Uniform Circular Motion
Chapter:
1.3

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

Concept: Centre of Gravity
Chapter:

What is the principle of an ideal machine?

Concept: Machines as Force Multipliers
Chapter: [0.012] Machines
1.4

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

Concept: Uniform Circular Motion
Chapter:
1.5

When does a force do work?

Concept: Work, Energy, Power - Relation with Force
Chapter: [0.011000000000000001] Work, Power and Energy

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

Concept: Concept of Work, Energy, Power
Chapter: [0.011000000000000001] Work, Power and Energy
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.

Concept: Different Types of Energy
Chapter: [0.011000000000000001] Work, Power and Energy  Modern Physics
2.2

State the energy change in the following device while in use:
A loudspeaker

Concept: Different Types of Energy
Chapter: [0.011000000000000001] Work, Power and Energy  Modern Physics

State the energy change in the following device while in use:

A glowing electric bulb.

Concept: Different Types of Energy
Chapter: [0.011000000000000001] Work, Power and Energy  Modern Physics
2.3

What is nuclear energy?

Concept: Different Types of Energy
Chapter: [0.011000000000000001] Work, Power and Energy  Modern Physics

Name the process used for producing electricity using nuclear energy.

Concept: Different Types of Energy
Chapter: [0.011000000000000001] Work, Power and Energy  Modern Physics
2.4

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

Concept: Different Types of Energy
Chapter: [0.011000000000000001] Work, Power and Energy  Modern Physics
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.

Concept: Different Types of Energy
Chapter: [0.011000000000000001] Work, Power and Energy  Modern Physics
3
3.1

Draw the diagram given below and clearly show the path taken by the emergent ray. Concept: Refraction of Light - Refraction of Light Through a Glass Block and a Triangular Prism
Chapter: [0.021] Refraction of Light Through Plane Surface
3.2

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

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

Name a common device that uses electromagnets.

Concept: Electromagnetic Induction
Chapter: [0.043] Electro Manetism
3.3

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

Concept: Refraction of Light - Refraction of Light Through a Glass Block and a Triangular Prism
Chapter: [0.021] Refraction of Light Through Plane Surface

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

Concept: Refraction of Light - Refraction of Light Through a Glass Block and a Triangular Prism
Chapter: [0.021] Refraction of Light Through Plane Surface
3.4

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

Concept: Total Internal Reflection - Critical Angle
Chapter: [0.021] Refraction of Light Through Plane Surface
3.5

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

Concept: Refraction of Light - Refraction of Light Through a Glass Block and a Triangular Prism
Chapter: [0.021] Refraction of Light Through Plane Surface

Name the radiation’s which can be detected by a thermopile.

Concept: Refraction of Light - Refraction of Light Through a Glass Block and a Triangular Prism
Chapter: [0.021] Refraction of Light Through Plane Surface
4
4.1

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

Concept: Using a Triangular Prism to Produce a Visible Spectrum from White Light
Chapter: [0.022000000000000002] Spectrum
4.2

What are mechanical waves?

Concept: Sound - Forced Vibrations and Resonance
Chapter: [0.03] Sound

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

Concept: Sound - Loudness, Pitch and Quality of Sound
Chapter: [0.03] Sound
4.3

Find the equivalent resistance between points A and B Concept: Resistance of a System of Resistors - Resistors in Series
Chapter: [0.040999999999999995] Current Electricity [0.042] Electrical Power and Energy and Household Circuits
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.

Concept: Calorimetry - Specific Heat Capacity
Chapter: [0.05] Heat
4.5

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

Concept: Concept of Work, Energy, Power
Chapter: [0.011000000000000001] Work, Power and Energy
5
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?

Concept: Work, Energy, Power - Relation with Force
Chapter: [0.011000000000000001] Work, Power and Energy

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. Concept: Machines as Force Multipliers
Chapter: [0.012] Machines
5.2

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

Concept: Different Types of Energy
Chapter: [0.011000000000000001] Work, Power and Energy  Modern Physics

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

Concept: Machines as Force Multipliers
Chapter: [0.012] Machines
5.3

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

Concept: Machines as Force Multipliers
Chapter: [0.012] Machines
6
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?

Concept: Refraction of Light - Refraction of Light Through a Glass Block and a Triangular Prism
Chapter: [0.021] Refraction of Light Through Plane Surface

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.

Concept: Refraction at Spherical Surfaces and by Lenses - Power of a Lens
Chapter: [0.023] Refraction of Light Through a Lense
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.

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

Define the power of a lens.

Concept: Refraction at Spherical Surfaces and by Lenses - Power of a Lens
Chapter: [0.023] Refraction of Light Through a Lense

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

Concept: Refraction at Spherical Surfaces and by Lenses - Power of a Lens
Chapter: [0.023] Refraction of Light Through a Lense
7
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.

Concept: Sound - Forced Vibrations and Resonance
Chapter: [0.03] Sound
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.

Concept: Using a Triangular Prism to Produce a Visible Spectrum from White Light
Chapter: [0.022000000000000002] Spectrum
7.3

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

Concept: Sound - Loudness, Pitch and Quality of Sound
Chapter: [0.03] 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 seconds. What is the speed of the signal?

Concept: Concept of Sound Numericals
Chapter: [0.03] Sound
8
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?

Concept: Resistance of a System of Resistors - Resistors in Series
Chapter: [0.040999999999999995] Current Electricity [0.042] Electrical Power and Energy and Household Circuits
8.2

What is an Ohmic resistor?

Concept: Ohm’s Law
Chapter: [0.040999999999999995] Current Electricity

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?

Concept: Ohm’s Law
Chapter: [0.040999999999999995] Current Electricity
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?

Concept: Resistance of a System of Resistors - Resistors in Series
Chapter: [0.040999999999999995] Current Electricity [0.042] Electrical Power and Energy and Household Circuits
9
9.1

Heat energy is supplied at a constant rate to 100g 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].

Concept: Calorimetry - Specific Heat Capacity
Chapter: [0.05] Heat
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?

Concept: Calorimetry - Specific Heat Capacity
Chapter: [0.05] Heat
9.3

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

Concept: Heat - Latent Heat
Chapter: [0.05] Heat  Modern Physics

What is the Greenhouse effect?

Concept: Heat - Latent Heat
Chapter: [0.05] Heat  Modern Physics
10
10.1

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

Concept: Magnetic Effect of a Current
Chapter: [0.043] Electro Manetism

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. Concept: Magnetic Effect of a Current
Chapter: [0.043] Electro Manetism
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 ?

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

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

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