# ICSE Class 10 For Physics Question Paper Solved Set D

Students should refer to ICSE Class 10 Physics Question Paper solved Set D given below which will help them to prepare for the upcoming ICSE Physics exams. Students should read ICSE Physics Class 10 Books to make sure they are completely prepared and should also refer to ICSE Class 10 Physics Solutions to understand all questions and their answers.

ICSE Class 10 Physics Question Paper solved Set D

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 I is compulsory. Attempt any four questions from Section II.
The intended marks for questions or parts of questions are given in brackets [ ].

ICSE Class 10 Physics Question Paper solved Set D
SECTION – I (40 Marks)
(Attempt all Questions)

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 a long arm? (2)
(d) If the power of a motor be 100 kW, at what speed can it raise a load of 50,000 N? (2)
(e) Which class of level will always have MA > 1 and why? (2)

(b) The magnitude of gravitational force between two bodies is inversely proportional to the square of the distance between them.
G.F. μ 1/r2
∴ As the distance is doubled, the force will become one fourth of the initial force.
(c) Increase in torque arm, increases the moment of force, so lesser effort is required for turming
(d) P = 100kW
∴ P = 100 × 1000W, F = 50000N
∴ Power = Force × Velocity
∴ 100000 = 50000 × V
∴ V = 2 ms–1
(e) Class II lever.
In a class II lever, the effort arm is always longer than the load arm, hence its MA > 1.

Question 2.
(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 solid.
(Specific heat capacity of water = 4.2 J/g°C)
(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? (2)
(e) State the conditions required for total internal reflection of light to take place. (2)

(a) Heat capacity of a body is the heat energy required to raise the temperature of the body by 1°C. Its S.I. unit is Jk–1.
(b) The base is thick hence the mass of the base is more.
This increases the heat capacity which enables the pan to hold a large amount of heat energy at a low temperature. The food is cooked properly and remains warm for a long time.
(c) Heat lost by solid = Heat gained by water

(d) (i) Refractive Index = Real depth / Apparent depth
(ii) Refractive Index = Velocity of light in air or vacuum / Velocity of light in given medium
(e) (i) The ray of light must travel from denser medium to rarer medium.
(ii) The angle of incidence should be greater than the critical angle.

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 20,000 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 will the radar be able to detect the plane? Take velocity of radiowaves as 3 × 108 ms–1. (2)
(d) How is the frequency of a stretched string related to :
(i) its length?
(ii) its tension? (2)
(e) Define specific resistance and state its SI unit. (2)

(d) (i) Frequency of a stretched string is inversely proportional to its length. ⇒ ƒ μ 1/l
(ii) Frequency of a stretched string is directly proportional to its tension. ⇒ ƒ μ √T
(e) Specific resistance of a conductor is the resistance of unit length of the conductor and of unit area of cross section.
Its SI unit is Ω 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.
(b) State two causes of energy loss in a transformer.
(c) State two characteristics of a good thermion emitter.
(d) State two factors upon which the rate of emission of thermions depends.
(e) When does the nucleus of an atom tend to be radioactive?

(a) R = 500 Ω I = 0.4 A
P = I2R = (0.4)2 × 500 = 80
∴ P = 80 W
∴ P = VI
∴ 80 = V × 0.4
∴ V = 80/0.4
V = 200 V
(b) (i) Formation of Eddy currents—the changing magnetic field induces current in the soft-iron core.
(ii) Resistance of primary or secondary coil.
(iii)Hysteresis—magnetisation of the core is reversed.
(c) (i) Low work function.
(ii) High melting point.
(d) (i) Nature of the surface.
(ii) Temperature of the surface.
(e) (i) When the number of neutrons is greater than the number of protons in the nucleus.
(ii) When the atomic number of an element is more than 82.

ICSE Class 10 Physics Question Paper solved Set D
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 the 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) (i) 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 efforts 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).
(i) Distance moved by the effort.
(ii) Work done by the effort.
(iii)MA of the pulley system.
(iv) Efficiency of the pulley system. (4)

(ii) By principle of moments
Anticlockwise moment = clockwise moment
∴ f1d1 = f2d2
∴ W × 4 = 20 × 21
∴ W × 105 gf
∴ Weight of the rule = 105 gf
(b) For a single fixed pulley, MA = 1
(i) ∴ Load = Effort       ∴ Effort = 50 kgf
For a single movable pulley, MA = 2
∴ 50/Effort = 2
∴ Effort = 25 kgf
∴ Effort applied using a single fixed pulley / Effort applied using a single movable pulley = 50/25 = 2 : 1
Effort applied by the boy using a single fixed pulley is twice the effort used by the boy using a single movable pulley.
(ii) Uniform circular motion has variable velocity and hence variable acceleration. Uniform linear motion has constant velocity and no acceleration and ∴ is un accelerated motion.
(iii)Nuclear fission.

Question 6.
(a) (i) How is the transference of heat energy by radiation prevented in a calorimeter?
(ii) You have a choice of three metals, A, B and C, of specific heat capacities 900 Jkg–1°C–1, 380 Jkg–1°C–1 and 460 Jkg–1°C–1 respectively, to make a calorimeter. Which material will you select? Justify your answer? (3)
(b) Calculate the mass of ice needed to cool 150 g of water contained in a calorimeter of mass 50 g at 30°C such that the final temperature is 5°C. (3)
Specific heat capacity of calorimeter 0.4 J/g°C
Specific heat capacity of water 4.2 J/g°C
Latent heat capacity of ice 330 J/g
(c) (i) Name the radiations which are absorbed by greenhouse gases in the earth’s atmosphere.
(ii) A radiation X is focused by a particular device on the bulb of a thermometer and mercury in the thermometer shows a rapid increase. Name the radiation X.
(iii)Name two factors on which the heat energy liberated by a body depends. (4)

(a) (i) The outer and inner surfaces of the calorimeter are polished to reduce loss of heat due to radiation.
(ii) Metal B, since metal B has lowest specific heat capacity among the three. So the amount of
heat energy taken by the calorimeter from its contents to acquire the temperature of its contents is negligible.
(b) Heat gained by ice = mL + mc ΔT
= m(330 + 4.2 × 5) = 351 mJ
Heat given out by water and calorimeter = (150 × 4.2 + 50 × .4) × (32 – 5) = 17550 J
Mass of ice = 17550/351 = 50 g
(c) (i) Infrared radiations of loy wavelength.
(iii)Mass, specific heat capacity.

Question 7.
(a) A lens forms an upright and diminished image of an object when the object is placed at the focal point of the given lens.
(i) Name the lens.
(ii) Draw a ray diagram to show the image formation. (3)
(b) A ray of light travels from water to air as shown in the diagram given below :

(i) Copy the diagram and complete the path of the ray. Given that the critical angle for water is 48°.
(ii) State the condition so that total internal reflection occurs in the above diagram. (3)
(c) The diagram below shows a point source P inside a water container. Four rays A, B, C, D starting from the source P are shown up to the water surface.

(i) Show in the diagram the path of these rays after striking the water surface. The critical angle for water-air surface is 48°.
(ii) Name the phenomenon which the rays B and D exhibit. (4)

(a) (i) Concave lens.

Image is between F and O. It is virtual, erect and diminished.

Image is between F and O. It is virtual, erect and diminished.

(ii) (1) The ray of light must travel from denser medium to rarer medium.
(2) The angle of incidence should be greater than the critical angle.

(ii) Ray B exhibits refraction of light.
Ray D exhibits total internal reflection of light.

Question 8.
(a) Name the factor that determines : (3)
(i) Loudness of the sound heard.
(ii) Quality of the note.
(iii) Pitch of the note.
(b) (i) What are damped vibrations? (3)
(ii) Give one example of damped vibrations.
(iii)Name the phenomenon that causes a loud sound when the stem of a vibrating tuning fork is kept pressed on the surface of a table.
(c) (i) A wire of length 80 cm has a frequency of 256 Hz. Calculate that length of a similar wire under similar tension, which will have a frequency of 1024 Hz. (4)
(ii) A certain sound has a frequency of 256 hertz and a wavelength of 1.3 m.
(1) Calculate the speed with which this sound travels.
(2) What difference would be felt by a listener between the above sound and another sound travelling at the same speed, but of wavelength 2.6 m?

(a) (i) Amplitude
(ii) Waveform
(iii) Frequency
(b) (i) The periodic vibrations of a body of decreasing amplitude in presence of a resistive force are called damped vibrations.
(ii) Oscillations of a simple pendulum in air. A tuning fork when struck on a rubber pad.
(iii)Resonance

Since the frequency of this sound is half of the first one the listener would feel the sound to be less shrill or flat.

Question 9.
(a) (i) Name the colour code of the wire which has connected to the metallic body of an appliance.
(ii) Draw the diagram of a dual control switch when the appliance is switched ‘ON’. (3)
(b) (i) Which particles are responsible for current in conductors?
(ii) To which wire of a cable in a power circuit should the metal case of a geyser be connected?
(iii)To which wire should the fuse be connected? (3)
(c) (i) Explain the meaning of the statement ‘current rating of a fuse is 5A’.
(ii) In the transmission of power the voltage of power generated at the generating stations is stepped up from 11 kV to 132 kV before it is transmitted. Why? (4)

(a) (i) Green or yellow.

(b) (i) Electrons
(ii) Earth wire
(iii) Live wire
(c) (i) The live wire or the line wire has a current-carrying capacity of 5 A. Hence, a thin fuse wire of low current-carrying capacity of 5 A is used. It is used for light and fan circuits.
(ii) The voltage is increased to decrease the current and prevent loss of energy due to heating in the line wires.

Question 10.
(a) Answer the following questions based on a hot cathode ray tube. (3)
(i) Name the charged particles.
(ii) State the approximate voltage used to heat the filament.
(iii)What will happen to the beam when it passes through the electric field?
(b) State three factors on which the rate of emission of electrons from a metal surface depends. (3)
(c) (i) What are the free electrons?
(ii) Why do they not leave the metal surface on their own?
(iii)How can they be made to leave the metal surface? (State any two ways) (4)