﻿ ICSE Class 10 Physics Solved Question Paper 2009 | Previous Year Papers | Zigya

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# ICSE Class 10 Physics Solved Question Paper 2009

#### Short Answer Type

1.

With reference to the terms mechanical advantage, velocity ratio and efficiency of a machine, name the term that will not change for a machine of a given design.

ii) Define the term stated by you in part (i).

i) Velocity Ratio.

ii) Velocity Ratio is the ratio of velocity of effort to the velocity of load.

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2.

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

The conditions for total internal reflection to take place are:

i) Light must always go from a denser to a rarer medium.

ii) The angle of incidence must be more than the critical angle.

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3.

Copy and complete the following table:

 Types of lens Position of object Nature of image Size of image Convex At F concave At infinity

 Types of lens Position of object Nature of image Size of image Convex At F Real and Inverted Highly magnified concave At infinity Virtual and erect Higly diminished
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4.

What is the SI unit of energy? How is the electron volt (eV) related to it?

Joule (J) is the SI unit of energy.

1 eV = 1.6 × 10-19

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5.

State the energy changes that takes place in the following when they are in use:

i) a photovoltaic cell

ii) an electromagnet

i) Light energy to electrical energy.

ii) Electrical energy to mechanical energy

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6.

A ray of light strikes the surface of a rectangular glass block such that the angle of incidence is i) 0o ii) 420. Sketch a diagram to show the approximate the path taken by the ray in each case as it passes through the glass block and emerges from it.

We know that angle of incidence = angle of reflection.

i) Given: i = 0o

Therefore, r = 0 ii)

Given: I = 42o

Therefore, r = 42o 1222 Views

7.

i) Why is white light considered to be polychromatic in nature?

ii) Give the range of the wavelength of those electromagnetic waves which are visible to us.

i) White light is considered to be polychromatic in nature because it contains number of wavelengths ( 4000 – 8000 ) and there are seven colors in it (VIBGYOR).

ii) 4000 – 8000 528 Views

8.

i) Copy and complete the diagram to show the formation of the image of the object AB.

ii) What is the name given to X.

i) ii) X is focus or the principal focus.
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9.

6.5 kJ of energy causes a displacement of 64 m in a body in the direction of force in 2.5 seconds. Calculate:

i) the force applied

ii) power in horse power(hp)

[ Take 1 hp = 764 W]

Given:

E = 6.4 kJ = 6400 J

D = 64 m

T = 2.5 sec

i) ii) Let, 524 Views

10.

A body of mass 5 kg is moving with a velocity of 10 m/s. What will be the ratio of its initial kinetic energy and final kinetic energy, if the mass of the body is doubled and its velocity is halved? Initial kinetic energy will become twice of the final kinetic energy.
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