# ICSE Class 10 For Physics Question Paper Solved Set B

Students should refer to ICSE Class 10 Physics Question Paper solved Set B 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 B

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 B SECTION – I (40 Marks)
(Attempt all Questions)

Question 1.
(a) The diagram below shows a claw hammer used to remove a nail;

(i) To which class of lever does it belong?
(ii) Given one more example of the same class of lever mentioned by you
in (i) for which the mechanical advantage is greater than one.
(b) Two bodies A and B have masses in the ratio 5:1 and their kinetic energies are in the ratio 125:9. Find the ratio of their velocities. [2]
(c) (i) Name the physical quantity which is measured in calories.
(ii) How is calories related to the S.I. unit of that quantity?
(d) (i) Define couple.
(ii) State the S.I. unit of moment of couple.
(e) (i) Define critical angle.
(ii) State one important factor which affects the critical angle of a given medium.
(a) (i) It belongs to class I lever.
(ii) The mechanical advantage is greater than one when effort arm of body is longer than the load arm. For example : crowbar, shears.

(c) (i) Heat energy is measured in calories
(ii) SI unit is Joule.
1 calorie = 4.18 J
(d) (i) Couple ⇒ Two equal and opposite parallel forces, not acting along the same line, form a couple.
(ii) Couple

Moment of couple = F × d = N × m
SI unit of moment of couple = Nm or Joule.
(e) (i) Critical angle is angle of incidence in denser medium corresponding to which angle of refraction in rarer medium is 90°.
(ii) Refractive index and wavelength.

Question 2.
(a) An electromagnetic radiation is used for photography in fog. [2]
(ii) Why is this radiation mentioned by you, ideal for this purpose?
(b) (i) What is the relation between the refractive index of water with respect to air (αμw) and the refractive index of air with respect to water (wμα).
(ii) If the refractive index of water with respect to air (αμw) is Calculate the refractive index of air with respect to water (wμα).
(c) The specific heat capacity of a substance A is 3,800 Jkg–1K–1 and that of a substance B is 400 Jkg–1K–1. Which of the two substances is a good conductor of heat? Give a reason for your answer. [2]
(d) A man playing a flute is able to produce notes of different frequencies. If he closes the holders near his mouth, will the pitch of the note produced, increase or decrease? Given a reason. [2]
(e) The diagram below shows a light source P embedded in a rectangular glass block ABCD of critical angle 42°. Complete the path of the ray PQ till it emerges out of the block. [Write necessary angles.] [2]

(ii) Infrared radiations are used for this purpose or they are not scattered much and can penetrate appreciably through it.
(b) (i) wμα × αμw =1

Substance B is good conductor of heat.
Reason ⇒ B has high conductivity because it has low specific heat capacity.
Low specific heat capacity = good conductor of heat.
(d) Pitch decreases as length of air column increases in flute.

Question 3.
(a) (i) If the lens is placed in water instead of air, how does its focal length change?
(ii) Which lens, thick or thin has greater focal length? [2]
(b) Two waves of the same pitch have amplitudes in the ratio 1: 3. [2]
What will be the ratio of their:
(i) Intensities and (ii) Frequencies?
(c) How does an increase in the temperature affect the specific resistance of a : [2]
(i) Metal and (ii) Semiconductor?
(d) (i) Define resonant vibrations. [2]
(ii) Which characteristic of sound, makes it possible to recognize a person by his voice without seeing him?
(e) It is possible for a hydrogen (H) nucleus to emit an alpha particle? [2]

(a) (i) Local length will.
(ii) Thin lens has greater focal length.
(b) (i) Amplitude = 1 : 3
Intensities = (1/3)2 = 1/9
(ii) Frequency does not depends upon amplitude.
∴ its ratio is 1 : 1.
(c) (i) Metal – increase (ii) Semiconductor – decrease
(d) (i) Resonant vibrations occurs due to phenomenon of Resonance.
It occurs due to resonance. It is special case of forced vibrations when frequency of externally applied force on body is equal to its natural frequency, body readily begins to vibrate with increased amplitude. Vibrations of large amplitude are called resonant vibrations.
(ii) pitch.
(e) No it is not possible.
It has not enough electrons and protons for emitting alpha particle.

Question 4.
(a) Calculate the effective resistance across AB : [2]

(c) A magnet kept at the centre of two coils A and B is moved to and fro as shown in the diagram. The two galvanometers show deflection.

(d) State with a reason whether:
x > y or x < y [x and y are magnitudes of deflection.] [2]
(i) Why a nuclear fusion reaction is called a thermos nuclear reaction?
(ii) Complete the reaction:
3He2 + 2H1 ⇒ 4He2 +…………….+ Energy
(e) State two ways to increase the speed of rotation of a D.C. motor. [2]

(b) (i) No, specific heat capacity changes from solid to liquid.
(ii) For e.g. ice and water have different specific heat capacity.
(c) y > x because (y) coil B have more number of turns.
(d) (i) Nuclear fusion is called Thermo nuclear reaction as it not occurs in ordinary temperature. It need about 107 Kelvin temperature.

ICSE Class 10 Physics Question Paper solved Set B SECTION II (40 Marks)
Attempt any four questions from this Section

Question 5.
(a) A body of mass 10 Kg is kept at a height of 5 m. It is allowed to fall and reach the ground.[3]
(i) What is the total mechanical energy possessed by the body at the height of 2m assuming it is a frictionless medium?
(ii) What is the kinetic energy possessed by the body just before hitting the ground?
Take g = 10m/s2.
(b) A uniform meter scale is in equilibrium as shown in the diagram: [3]

(i) Calculate the weight of the meter scale.
(ii) Which of the following options is correct to keep the ruler in equilibrium when 40 gf wt is shifted to 0 cm mark?
F is shifted towards 0 cm or F is shifted towards 100 cm

(c) The diagram below shown a pulley arrangement : [4]
(i) Copy the diagram and mark the direction of tension on each stand of the string.
(ii) What is the velocity ratio of the arrangement?
(iii) If the tension acting on the string is T, then what is the relationship between T and effort E?
(iv) If the free end of the string moves through a distance x, find the distance by which the load is raised.

Question 6.
(a) How does the angle of deviation formed by a prism change with the increase in the angle of incidence? [3]
Draw a graph showing the variation in the angle of deviation with the angle of incidence at a prism surface.
(b) A virtual, diminished image is formed when an object is placed between the optical centre and the principal focus of a lens. [3]
(i) Name the type of lens which forms the above image,
(ii) Draw a ray diagram to show the formation of the image with the above stated characteristics.
(c) An object is placed at a distance of 24 cm from a convex lens of focal length 8 cm. [4]
(i) What is the nature of the image so formed?
(ii) Calculate the distance of the image from the lens,
(iii) Calculate the magnification of the image.

(a) First with increase in angle of incidence angle deviation first decrease to deviation minimum and then it increase.

(b) (i) concave lens
(ii) Image is diminished and virtual.

(c) (i) Real image

Question 7.
(a) It is observed that during march-past we hear a base drum distinctly from a distance compared to the side drums. [3]
(i) Name the characteristic of sound associated with the above observation,
(ii) Given a reason for the above observation.
(b) A pendulum has a frequency of 4 vibrations per second. An observer starts the pendulum and fires a gun simultaneously. He hears the echo from the cliff after 6 vibrations of the pendulum. If the velocity of sound in air is 340 m/s, find the distance between the cliff and observer. [3]
(c) Two pendulums C and D are suspended from a wire as shown in the figure given below. Pendulum C is made to oscillate by displacing it from its mean position. It is seen that D also starts oscillating. [4]

(i) Name the type of oscillation, C will execute.
(ii) Name the type of oscillation, D will execute.
(iii) If the length of D is made equal to C then what difference will you notice in the oscillations of D?
(iv) What is the name of the phenomenon when the length of D is made equal to C?

(a) (i) Loudness is characteristic of sound associated with above observation.
(ii) Surface area of bass drum is more therefore amplitude is more and it produces more loudness.
(b) 4 vibration = 1 second (frequency of pendulum)
1 vibration = 1/4 second
6 vibration = 1/4 x 6 second
t = 6/4 second
Speed = 340 m/s = V
For echo, d = V/ 2 = 340 x 6 / 4 x 2 = 255m

(c) (i) Forced oscillation as Pendulum C is made to oscillate by displacing it from mean position and it is not in vaccum.
(ii) Resonant oscillation.
(iii) If length of D is made equal to C then vibration of both will be same.
(iv) Resonance.

Question 8.
(a) (i) Write one advantage of connecting electrical appliance in parallel combination. [3]
(ii) What characteristic should a fuse wire have?
(iii) Which wire in a power circuit is connected to the metallic body of the appliance?
(b) The diagram below shows a dual control switch circuit connected to a bulb. [3]

(i) Copy the diagram and complete it so that bulb is switch ON.
(ii) Out of A & B which one is the live wire and which one is the neutral wire?
(c) The diagram below shows a circuit with the key k open. Calculate :

(i) the resistance of the circuit when the key k is open.
(ii) the current drawn from the cell when the key k is open.
(iii) the resistance of the circuit when the key k is closed.
(iv) the current drawn from the cell when the key k is closed.

(a) (i) If both are in parallel combination then if one is damaged then other will not be damaged or effected.
(ii) A fuse wire should have high resistivity and low melting point.
(iii) Earth wire.

(ii) A is line wire and B is neutral wire.

Question 9.
(a) (i) Define Calorimetry. [3]
(ii) Name the material used for making a Calorimeter.
(iii) Why is a Calorimeter made up of thin sheets of the above material answered in (ii)?
(b) The melting point of naphthalene is 80°C and the room temperature is 30°C. A sample of liquid naphthalene at 100°C is cooled down to the room temperature.
Draw a temperature time graph to represent this cooling. In the graph, mark the region which corresponds to the freezing process. [3]
(c) 104 g of water at 30°C is taken in a calorimeter made of copper of mass 42g. When a certain mass of ice at 0°C is added to it, the final temperature of the mixture after the ice has melted, was found to be 10° C. Find the mass of ice added.
[Specific heat capacity of water = 4.2 Jg–1°C–1; Specific latent heat of fusion of ice = 336 Jg–1; Specific heat capacity of copper = 0.4 Jg–1°C1] [4]

(a) (i) The measurement of heat energy that means heat lost or gained is called calorimetry.
(ii) Copper.
(iii) Copper has low specific heat capacity if we use thin sheetd, the thermal capacity further decreases therefore we made it thin sheets of copper.

Calorimeter = 42 gm at 30°C
(Copper)
According to principle of calorimetery
Heat lost = Heat gained
Final temperature = 10°C
Q = mcΔt
⇒ (104 × (30-10) × 4.2) + (42 × (30-10) × 0.4) = (x × 336) + (x + 4.2 × 10- 0)
⇒ 8736 + 336 = 378x
9072 = 378x ⇒ x = 9072/378 = 24gm

Question 10.
(a) Draw a neat labeled diagram of an A.C. generator. [3]
(b) (i) Define nuclear fission. [3]
(ii) Rewrite and complete the following nuclear reaction by filling in the atomic number of Ba and mass number of Kr :

(c) The diagram below shows a magnetic needle kept just below the conductor AB which is kept in North South direction.

(i) In which direction will the needle deflect when the key is closed?
(ii) Why is the deflection produced?
(iii) What will be the change in the deflection if the magnetic needle is taken just above the conductor AB?
(iv) Name one device which work on this principle.