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## Physics 2010 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 2010 Solved Question Paper ICSE Previous Year

SECTION-I (40 Marks)

Attempt all questions from this Section.

Question 1:

(a) Name the device used for measuring :
(i) mass
(ii) weight.  

(b) A body weighs 360 N on the earth :
(i) What would be his approximate weight on the moon ?

(c) A body is acted upon by a force. State two conditions under which the work done could be zero. 

(d) A spring is kept compressed by a small trolley of mass 0.5 kg lying on a smooth horizontal surface as shown in the figure given below : When the trolley is released, it is found to move at a speed of 2 ms-1

(e) Name the subjective property :

(i) of sound related to its frequency.
(ii) of light related to its wavelength. 

(a) (i) The mass is measured by using a balance scale, beam balance or laboratory balance. An analytical balance is used to measure mass to a very high degree of precision.
(ii) The weight is measured using a spring balance.

(b) Answer has not given due to out of present syllabus.

(c) The two conditions are :
(i) Displacement is zero.
(ii) Angle between force and displacement is 90°.

(d) (e) (i) Pitch. (ii) Colour

Question 2:

(a) (i) Why is the mechanical advantage of a lever of the second order always greater than one ?
(ii) Name the type of single pulley that has a mechanical advantage greater than one.  

(b) (i) What is meant by refraction of light ?
(ii) What is the cause of refraction of light ?  

(c) ‘The refractive index of diamond is 2.42’.
What is meant by this statement ? 

(d) We can bum a piece of paper by focusing the sun rays by using of lens.
(i) Name the type of lens used for the above purpose.

(e) A ray of light enters a glass slab PQRS, as shown in the diagram. The critical angle of the glass is 42°. Copy this diagram and complete the path of the ray till it emerges from the glass slab. Mark the angles in the diagram wherever necessary.  

(a) (i) ∴    Effort arm > Load arm.
(ii) Single movable pulley.

(b) (i) The deviation in the path of light when it travels from one medium to the other is called refraction of light.
(ii) Speed of light is different in different mediums.

(c) It means that the ratio of speed of light in air to the speed of light in diamond is 2.42.

(d) (i) Convex lens.
(ii) (e) Question 3:

(a) State two differences between light waves and sound waves.  

(b) Two waves of the same pitch have their amplitudes in the ratio 2 : 3.
(i) What will be the ratio of their loudness ?
(ii) What will be the ratio of their frequencies ?  

(c) Give two differences between a d.c. motor and an a.c. generator.  

(d) Six resistances are connected together as shown in the figure. Calculate the equivalent resistance between the points A and B. (e) (i) Which part of an electrical appliance is earthed ?
(ii) State a relation between electrical power, resistance and potential difference in an electrical circuit. 

(a) Difference between Sound waves and Light waves :

 Sound Waves Light Waves 1. These are mechanical waves. They require medium for propagation. 1. These are electromagnetic waves. They can travel in vacuum. 2. These are longitudinal waves. 2. These are transverse waves.

(b) (i) ∴ Loudness ∝ (Amplitude)2 (ii) Frequency remains same if pitch is unchanged. i.e., Ratio of frequencies = 1 : 1

(c) Difference between D.C. motor and A.C. Generator:

 D. C. Motor A. C. Generator (i) It converts Electrical energy into Mechanical energy. (i) It converts Mechanical energy into Electrical energy. (ii) It consists of split rings. (ii) It consists of slip rings.

(d) The resistance 2Ω, 3Ω and 5Ω are in series. Their equivalent resistance is R’ = 2 + 3 + 5 = 10Ω.
Now the resistance 10Ω and R’ are in parallel. Their equivalent resistance is Now 2Ω, R” (= 5Ω) and 5Ω resistances are in series between A and B.
∴ Equivalent resistance between A and B is,
= 2 + 5 + 5 = 12Ω.

(e) (i) The outer body of an electrical appliance which can be handled physically is earthed for the safety reasons. For the earthing of an appliance, the earth wire of the cable is connected to outer metallic case of the appliance.
(ii) Question 4:

(a) A device is used to transform 12V a.c. to 200 V a.c.
(i) What is the name of this device ?
(ii) Name the principle on which it works.  

(b) (i) Which materials is the calorimeter commonly made of ?
(ii) Give one reason for using this material.  

(c) (i) Name a metal that is used as an electron emitter.
(ii) Give one reason for using this metal.  

(d) Complete the following nuclear changes: (e) (i) Which radiation produces maximum biological damage ?
(ii) What happens to the atomic number of an element when the radiation named by you in part (i) above, are emitted ?  

(a) (i) Step up Transformer.
(ii) Faraday’s Law of Electromagnetic Induction.

(b) (i) Copper.
(ii) Specific heat capacity of copper is low.

(c) (i) Tungsten coated with oxide.
(ii) Melting point of Tungsten is high.

(d) (where $_{ 2 }^{ 4 }{ He }$ is a particle.)