Physics 2011 Solved Question Paper ICSE Previous Year for practice so that student of class 10th ICSE can achieve their goals in next exam of council. Sample paper for physics also given . Hence by better practice and Solved Question Paper of Previous Year including 2011 is very helpful for ICSE student. By the practice of Physics 2011 Solved Question Paper ICSE Previous Year you can get the idea of solving. Try Also other year except Physics 2011 Solved Question Paper ICSE Previous Year for practice. Because only Physics 2011 Solved Question Paper ICSE Previous Year is not enough for preparation of council exam.

## Physics 2011 Solved Question Paper ICSE Previous Year

(Two hours)
Answers to this Paper must he written on the paper provided separately.
You will not be allowed to write during the first 15 minutes.
This time is to he spent in reading the question paper.
The time given at the head of this Paper is the time allowed for writing the answers.
Section I is compulsory. Attempt any four questions from Section II.
The intended marks for questions or parts of questions are given in brackets [ ].

### Physics 2011 Solved Question Paper ICSE Previous Year

SECTION-I (40 Marks)

Attempt all questions from this Section.

Question 1:

(a) (i) Define one newton.
(ii) Write the relation between S.I. unit and C.G.S. unit of force.  

(b) Where does the position of centre of gravity lie for
(i) a circular lamina
(ii) a triangular lamina ?  

(c) A man can open a nut by applying a force of 150 N by using a lever handle of length 0.4 m. What should be the length of the handle if he is able to open it by applying a force of 60 N ?  

(d) Name a machine which can be used to
(i) multiply force
(ii) change the direction of force applied.  

(e) The diagram below shows a lever in use. (i) To which class of lever does it belong ?
(ii) If FA = 40 cm, AB = 60 cm, then find the mechanical advantage of the lever.  

(a) (i) One Newton is the amount of force required to produce an acceleration of 1 ms-2 in a body of mass 1 kg.
(ii) (b) (i) Centre of the circle or the point of intersection of diameters.
(ii) Centroid or the point of intersection of its medians.

(c) Equating the torque in both the cases : (d) (i) Inclined plane
(ii) Pulley

(e) (i) IInd class lever.
(ii) Question 2:

(a) A ball of mass 200 g falls from a height of 5 m. What will be its kinetic energy when it just reaches the ground ? (g = 9.8 ms-2). 

(b) In the diagram below, PQ is a ray of light incident on a rectangular glass block.
(i) Copy the diagram and complete the path of the ray of light through the glass block. In your diagram, mark the angle of incidence by letter ‘i’ and the angle of emergence by the letter ‘e’. (ii) How are the angle ‘i’ and ‘e’ related to each other ? 

(c) A ray of monochromatic light enters a liquid from air as shown in the diagram given below :
(i) Copy the diagram and show in the diagram the path of the ray of light after it strikes the mirror and re-enters the medium of air.
(ii) Mark in your diagram the two angles on the surface of separation when the ray of light moves out from the liquid to air. (d) (i) When does a ray of light falling on a lens pass through it undeviated ?
(ii) Which lens can produce a real and inverted image of an object ? 

(e) (i) How is the refractive index of a medium related to its real depth and apparent depth ?
(ii) Which characteristic property of light is responsible for the blue colour of the sky ? 

(a) (i) (b) (i) (ii) ∠i = ∠e

(c) (d) (i) When the ray is directed towards the optical centre.
(ii) Convex lens.

(e) (i) (ii) Dispersion of light.

Question 3:

(a) When acoustic resonance takes place a loud sound is heard. Why does this happen ? Explain. 

(b) (i) Three musical instruments give out notes at the frequencies listed below.
Flute : 400 Hz; Guitar : 200 Hz; Trumpet; 500 Hz. Which one of these has the highest pitch ?
(ii) With which of the following frequencies does a tuning fork of 256 Hz resonate ? 288 Hz, 314 Hz, 333 Hz, 512 Hz. 

(c) Two bulbs are marked 100 W, 220 V and 60 W, 110 V. Calculate the ratio of their resistances. 

(d) (i) What is the colour code for the insulation on the earth wire ?
(ii) Write an expression for calculating electrical power in terms of current and resistance. 

(e) Calculate the equivalent resistance between A and B from the following diagram: (a) When acoustic resonance takes place, the natural frequency of vibration of body is equal to the frequency of external force, so the body vibrations of the largest possible amplitude.
Since loudness ∝ Amplitude2.
∴ A loud sound is heard.

(b) (i) Trumpet: 500 Hz (since Pitch ∝ Frequency)
(ii) 512 Hz

(c) (d) (i) Green at Yellow
(ii) P = VI = (IR) I      (∵ By Ohm’s Law, V = IR)
P = I2R

(e) Let R be the equivalent resistance between A and B, Question 4:

(a) Differentiate between heat and temperature.  

(b) (i) Define Calorimetry.
(ii) What is meant by Energy degradation ?  

(c) 200 g of hot water at 80 °C is added to 300 g of cold water at 10 °C. Calculate the final temperature of the mixture of water. Consider the heat taken by the container to be negligible, [specific heat capacity of water is 4200 J kg-1 °C-1]  

(d) Fill in the blanks in the following sentences with appropriate words :
(i) During the emission of a beta particle, the ………. number remains the same.
(ii) The minimum amount of energy required to emit an electron from a metal surface is called ………. .  

(e) A mixture of radioactive substances gives off three types of radiations.
(i) Name the radiation which travels with the speed of light.
(ii) Name the radiation which has the highest ionizing power. 

(a)

 Heat Temperature (i) It is a form of energy (i) It the degree of hotness or codness of a body. (ii) Unit is Joule/Calorie. (ii) Unit is °C, °F or Kelvin.

(b) (i) Heat is a form of energy which flows from the body at a higher temperature to a body at a lower temperature. The measurement of the quantity of heat is called calorimetry.
(ii) The dissipation of energy in the form of non useful energy (usually due to friction) is called Energy degradation.

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