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ICSE Physics 2017 Previous Year Solved Question Paper 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 is helpful for ICSE student.

## ICSE Physics 2017 Previous Year Solved Question Paper

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

#### Section – A [40 Marks] (Attempt all questions from this Section)

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Question 1.

(a) A brass ball is hanging from a stiff cotton thread. Draw a neat labelled diagram showing the forces acting on the brass ball and the cotton thread. [2]
(b) The distance between two bodies is doubled. How is the magnitude of gravitational force between them affected ? [2]
(c) Why is a jack screw provided with along arm? [2]
(d) If the power of a motor be 100 kW, at what speed can it raise a load of50,000 N? [2]
(e) Which class of lever will always have MA > 1 and why? [2]

Answers : 1

(a) The diagram is as shown.

(b) It becomes one-fourth. This is because
(c) As a large mechanical advantage is required by the jack screw used for cutting metal, hence its handle should be long and the blades short.

(MA = effort arm / load arm)

(d) P = Fυ, therefore, υ = P/F = 100000 / 50000 = 2 ms-1

(e) Class II lever, because the effort arm is always greater than the load arm.

Question 2.

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(a) Define heat capacity and state its SI unit. [2]
(b) Why is the base of a cooking pan generally made thick ? [2]
(c) A solid of mass 50 g at 150°C is placed in 100 g of water at 11°C, when the final temperature recorded is 20°C. Find the specific heat capacity of the solidfSpecific heat capacity of water – 4.2 J g -1 °C -1 ). [2]
(d) How is the refractive index of a material related to :
(i) real and apparent depth ?
(ii) velocity of light in vacuum or air and the velocity of light in a given medium ?
(e) State the conditions required for total internal reflection of light to take place. [2]

Answers: 2

(a) It is defined as the amount of heat required in raising the temperature of a unit mass of a substance through 1°C. Its SI unit is J kg-1 K-1.

(b) It is because thicker pans can have better heat distribution and heat retention due to thermal conductivity and thermal mass.

(c) Given mass of solid ms = 50 x 10-3 kg
Mass of water mw = 100 x 10-3 kg
Temperature of solid = 1500°C
Temperature of water = 110°C
Final temperature = 200°C
Specific heat of water = 4.2 J kg-1 °C-1
Now, heat lost by the solid = heat gained by water
50 × 10-3 × c × (1500 – 200) = 100 x 10-3 × 4200 × (200 – 110)
Or  c = 581 J kg-1 °C-1

(d) (i) μ = $\frac { real depth }{ apparent depth }$

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(ii) μ = $\frac { c }{ \upsilon }$

(e) (i) The incident ray should travel from the denser to the rarer medium.
(ii) The angle of incidence in the denser medium should be greater than the critical angle for the given pair of media.

Question 3.

(a) Draw a ray diagram to show the refraction of a monochromatic ray through a prism when it suffers minimum deviation. [2]
(b) The human ear can detect continuous sounds in the frequency range from 20 Hz to 20000 Hz. Assuming that the speed of sound in air is 330 ms-1 for all frequencies, calculate the wavelengths corresponding to the given extreme frequencies of the audible range. [2]
(c) An enemy plane is at a distance of 300 km from a radar. In how much time the radar will be able to detect the plane? Take velocity of radio waves as 3 × 108 m s-1[2]
(d) How is the frequency of a stretched string related to : [2]
(i) its length?
(ii) its tension?
(e) Define specific resistance and state its SI unit. [2]

Answers:3

(a) The ray diagram is as shown:

(b) The corresponding wavelengths are λlowest =$\frac { V }{ \upsilon }$ = $\frac { 330 }{ 20000 }$ = 0.0165 m and λhighest $\frac { V }{ \upsilon }$ =$\frac { 330 }{ 20 }$ = 16.5 m.

(c) Given S = 300Km = 300000 m ,c = 3 × 108ms-1, t = ?

Using $\frac { 2S }{ \upsilon }$ = $\frac{2 \times 300000}{3 \times 10^{8}}$ = 2 × 10-3 s

(d) (i) Inversely proportional to its length and
(ii) Directly proportional to the square root of tension.

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(e) It is the resistance of unit cube of the material. Its SI unit is ohm-m.

Question 4.

(a) An electric bulb of resistance 500 Ω, draws a current of 0.4 A. Calculate the power of the bulb and the potential difference at its end. [2]
(b) State two causes of energy loss in a transformer. [2]
(c) State two characteristics of a good thermion emitter. [2]
(d) State two factors upon which the rate of emission of thermions depends. [2]
(e) When does the nucleus of an atom tend to be radioactive? [2]

Answers : 4

(a) Given R = 500 W, I = 0.4 A, V = ?, Using V = IR, we have V = 0.4 × 500 = 200 V

(b) Copper loss and iron loss.

(c) (i) Should have high melting point and
(ii) Should have low value of work function.

(d) (i) The nature of the metal and
(ii) Temperature of the metal surface.

(e) The nucleus tends to be radioactive when it becomes unstable.

#### Section – II [40 Marks] (Attempt any four questions from this Section)

Question 5.

(a) A uniform half metre rule balances horizontally on a knife edge at 29 cm mark when a weight of 20 gf is suspended from one end.
(i) Draw a diagram of the arrangement
(ii) What is the weight of the half metre rule ? [3]
(b) A boy uses a single fixed pulley to lift a load of 50 kgf to some height. Another boy uses a single movable pulley to lift the same load to the same height. Compare the effort applied by them. Give a reason to support your answer.
(ii) How does uniform circular motion differ from uniform linear motion ?
(iii) Name the process used for producing electricity using nuclear energy. [3]
(c) A pulley system with VR = 4 is used to lift a load of 175 kgf through a vertical height of 15 m. The effort required is 50 kgf in the downward direction, (g = 10 N kg-1). [4]
Calculate:
(i) Distance moved by the effort.
(ii) Work done by the effort.
(iii) M.A. of the pulley system.
(iv) Efficiency of the pulley system.

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