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## Physics 2016 Solved Question Paper ICSE

(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 2016 Solved Question Paper ICSE

#### SECTION- I (40 Marks)

(Attempt All questions from this Section)

Question 1:

(a) (i) Give an example of a non contact force which is always of attractive nature.
(ii) How does the magnitude of this non contact force on the two bodies depend on the distance of separation between them? 
(b) A boy weighing 4okgf climbs up a stair of 30 steps each 20 cm high in 4 minute and a girl weighing 3okgf does the same in 3 minutes. Compare:
(i) The work done by them.
(ii) The power developed by them. 
(c) With reference to the terms Mechanical Advantage, Velocity Ratio and efficiency of a machine, name and define the term that will not change for a machine of a given design. 
(d) Calculate the mass of ice required to lower the temperature of 300g of water at 40°C to water at 0°C. 
(Specific latent heat of we = 336 J/g, Specific heat capacity of water = 4.2 J/g°C)
(e) What do you understand by the following statements: 
(i) The heat capacity of the body is 60 JK-1.
(ii) The specific heat capacity of lead is 130 Jkg-1 K-1.

(a) (i) Gravitation Force.
Example: A ball placed on a table starts rolling down when the table is tilted.
(ii) It varies inversely as the square of distance of separation between them i.e., as the distance between the two bodies increases, the magnitude of the force between them decreases.
(b) (i) Given: m= 40 kgf, m= 30 kgf, h= h2, t= 4 minutes = 4 x 60 sec, t= 3 minutes = 3 x 60 sec.
Comparing work done by them: (ii) Comparing power developed by them : (c) (i) For a machine of a given design, due to friction and weight of the moving parts of machine, the velocity ratio does not change, but both mechanical advantage and the efficiency decreases.
Velocity Ratio: It is the ratio of the velocity of effort to the velocity of load, i.e., ${ V }.R=\frac { { V }_{ E } }{ { V }_{ L } }$

(d) Heat extracted by ice at 0°C to melt = Heat given by water to reach 0°C from 40°C. ∴ Ice is required to lower the temperature of water = 150 gm.
(e) (i) The given body requires 60 J of heat energy to raise its temperature through 1K.
(ii) 1 kg of lead requires 130 J of heat energy to raise its temperature through 1K.

Question 2:

(a) State two factors upon which the heat absorbed by a body depends. 
(b) A boy uses blue colour of light to find the refractive index of glass. He then repeats the experiment using red colour of light. Will the refractive index be the same or different in the two cases ? Give a reason to support your answer. 
(c) Copy the diagram given below and complete the path of light ray till it emerges out of the prism. The critical angle of glass is 42°. In your diagram mark the angles wherever necessary. (d) State the dependence of angle of deviation :
(i) On the refractive index of the material of the prism.
(ii) On the wavelength of light. 
(e) The ratio of amplitude of two waves is 3 :4. What is the ratio of their :
(i) loudness ? (ii) frequencies ? 

(a) (i) Heat absorbed by the body is directly proportional to mass of the body i.e., more will be the mass, more heat will be absorbed by the body.

Q ∝ M

(ii) Heat absorbed by the body is directly proportional to the rise in temperature i’e., more heat will be absorbed when body heated at greater temperature.

Q ∝ ∆t

(b) Refractive index will be different in these two cases i.e., μB > μR  (In glass).
Reason: In glass, speed of red light is greater than speed of Blue light.
(c) (d) (i) For a given angle of incidence, the prism with a higher refractive index (eg., flint glass) produces a greater deviation than the prism which has lower refractive index (eg., crown glass).
(ii) Angle of deviation decreases with the increases in the wavelength of light. (e) (i) Loudness of sound is directly proportional to the square of amplitude i.e., (ii) Change in amplitude of a sound does not affect its frequency.
∴ Ratio of frequencies remains same = 1 : 1 .

Question 3:

(a) State two ways by which the frequency of transverse vibrations of a stretched string can be increased.
(b) What is meant by noise pollution ? Name one source of sound causing noise pollution. 
(c) The V-I graph for a series combination and for a parallel combination of two resistors is shown in the figure below. Which of the two A or B, represents the parallel combination ? Give a reason for your answer. 
(d) A music system draws a current of 400 mA when connected to a 12V battery.
(i) What is the resistance of the music system ?
(ii) The music system is left playing for several hours and finally the battery voltage drops and the music system stops playing when the current drops to 320 mA. At what battery voltage does the music system stop playing ? 
(e) Calculate the quantity of heat produced in a 20Ω resistor carrying 2.5A current in 5 minutes. 

(a) (i) The frequency of transverse vibrations of a stretched string is inversely proportional to the length of the string i.e., frequency can be increased by decreasing the length of the string. (ii) The frequency of transverse vibrations of a stretched string is inversely proportional to the radius of the string (i.e., frequency can be increased by decreasing the radius of the string).

(b) Noise Pollution : It is a sound produced by an irregular succession of disturbances. It is a discontinuous sound and unpleasant to the ear e.g., sound produced when a stone is thrown on a tin sheet.

(c) ‘A’ represents parallel combination because A is less steeper than B so resistance of ‘A’ is less than ‘B’. As wdknow resistance in parallel combination is less than series combination.

(d) (e) Hence, 37.5 kJ heat is produced.

Question 4: