ICSE Physics Sem-2 Answer Key 2022, Solved Board Question Paper, Step by step solutions of ICSE Class-10 Physics Question Paper of Sem-2  for 2022 as council prescribe guideline. Visit official website CISCE for detail information about ICSE Class-10

## ICSE Physics Sem-2 Answer Key 2022, Solved Board Question Paper,

 Board ICSE Class 10th (X) Subject Physics Topic Physics Semester-2 Answer Key Syllabus On bifurcated syllabus (after reduction) session 2021-22 Question Type MCQ (Sec- A) and Descriptive (Sec-B) Total questions 6 Max mark 40

### Section A

(Attempt all questions from this section)

Question 1:

Choose the correct answers to the questions from the given options. (Do not copy the question. Write the correct answer only.)

(i) Free vibrations are:

(a) the vibrations under the influence of a periodic force

(b) the vibrations with larger amplitude

(c) the vibrations when the frequency continuously decreases

(d) the vibrations with a constant frequency and constant amplitude

Answer : (d) the vibrations with a constant frequency and constant amplitude

(ii) The diagram below shows four waves. Which sound has the highest pitch ?

(iii) The graph plotted for potential difference (V) against current (I) for ohmic resistors is:

(a) A curve passing through the origin

(b) A straight line not passing through origin

(c) A straight line passing through origin

(d) A circle centred at the origin

Answer : (c) A straight line passing through origin

(iv) A main switch in the main distribution board is present in:

(a) a live wire

(b) a neutral wire

(c) a live as well as neutral wire

(d) an earth wire

Answer : (c) a live as well as neutral wire

(v) A conductor AB is kept along north south direction of the earth above a magnetic needle as shown below. When the key K is closed then:

(a) the needle will not show any deflection

(b) the needle will deflect towards east

(c) the needle will turn in the opposite direction i.e. towards south

(d) the needle will deflect towards west.

Answer : (d) the needle will deflect towards west.

(vi) A coil wound around a piece or sort iron can become an clectromagnet

(a) the Circuit is open

(b) a magnetic compass is present in the vicinity

(c) a galvanometer is connected to the circuit

(d) a current flows in the circuit

Answer : (d) a current flows in the circuit

(vii) If water absorbs 4000 joule heat to increase the temperature of 1 kg water through 1°C then the specific heat capacity of water is:

(a) 4 Jkg-1 °C-1

(b) 400 Jg-1 °C-1

(c) 4JgC-1 °C-1

(d) 4.2 Jg-1 °C-1

(viii) Water is used in car radiators because:

(a) t is a good conductor of heat.

(b) it conducts heat faster as compared to the other substances and cools the engine quckly

(c) its specific heat capacity is very low,

(d) its specific heat capacity is very high so it can cool the engine without a greater increase in its own temperature.

Answer : (d) its specific heat capacity is very high so it can cool the engine without a greater increase in its own temperature.

(ix) The heaviest nuclear radiation is:

(x) To study the age of excavated material of archaeological significance we study the rate of decay of an isotope of:

(a) Uranium

(b) Cobalt

(c) Carbon

(d) Chlorine

### Section B

(Attempt any three questions from this section)

Question 2 :

(i) The diagram below shows a magnetic compass kept closer to a coil AB wound around a hollow cylindrical cardboard :

(a) After studying the circuit ana the magnetic compass carefully, state whether the switch S1 is open or closed.

Ans- Open

(b) How did you arrive at the conclusion in (a) ?

Ans–because compass is not deflected other than N/S

(c) What is the purpose of placing the magnetic compass in the above setup?

Ans- To check that magnetic field produce around current carrying conductor

(ii)

(a) Give an important reason for copper to be used as a material for a calorimeter.

Ans- due to good conductor

(b) Calculate the thermal capacity of 40 g of water.

[Specific heat capacity of water 4200 Jg-1 °C-1]

Ans- thermal capacity = M x C = 40  x 4200 =    168000

(iii)

In the above circuit diagram, calculate:

(a) the external resistance of the circuit

(b) the current I2

(c) the current

Ans-

Question 3:

(i) Three wires with proper colour coding are connected to the three terminals of a three-pin socket. Match the colour of the wire with the proper terminals A, B and C of the socket

(a) Brown — C

(b) Green– B

(c) Light blue- A

(ii)

(a) Why does it become colder after a hailstorm than during or before the hailstorm?

Ans- Before and during the hailstorm there is plenty amount of heat present in the atmosphere. But after the hail-storm ice absorbs heat energy required for melting from the surrounding, so the temperature of surrounding fall and we feel cold

(b) “If two bodies have the same specific heat capacities, then they will always absorb the same amount of heat if their temperature increases by the same amount.” State whether the given statement is true or false.

Ans- False, because also depend upon mass of each body

(iii) A metal piece of mass 420g present at 80C 1s dropped in 80°g of water present at 20°Cin a calorimeter of mass 84g. lf the final temperature of the mixture is 30°C then calculate the specific heat capacity of the metal piece.

[Specific heat capacity of water = 4.2 Jg-1 °C-1 Specific heat capacity of the calorimeter 200 JkgJg-1 °C-1].

Ans-

Question 4:

(i) Rohit playing a flute and Anita playing a piano emit sounds of same pitch and loudness.

(a) Name one characteristic that is different for waves from the two different instruments.

Ans- Quality of sound.

(b) It now the loudness of the sound from flute becomes four times that of the sound from piano, then write the value of the ratio Af : Ap. (Af-amplitude of sound wave from flute, Ap-amplitude of sound wave from piano)

L = Squire of Amplitude

Af : Ap  = 4 :2

(c) Define ‘Pitch’ of a sound.—Pitch is the rise and fall of our voice when we speak. It is the characteristic of sound by which we can distinguish the sounds of the same loudness. Types: Pitch is generally of two types, high pitch and low pitch. High Pitch: The higher the frequency of the sound, the higher will be the pitch

(ii)

(a)Name two factors on which the force experienced by a conductor carrying current, placed in a magnetic field, depends. Also state how these factors affect the force.

Ans– Factors on which the direction of force experienced by a current-carrying conductor placed in a magnetic field depend are. (i)the direction of current. (ii) the direction of magnetic field.

(b) With the help of which rule you can determine the direction of force acting on a current carrying conductor placed in a magnetic field?

Ans- Fleming’s right hand rule

(iii)

(a) What is nuclear energy ?

Ans- Nuclear energy is the energy in the nucleus, or core, of an atom. Nuclear energy can be used to create electricity, but it must first be released from the atom

(b) Atter emission of a nuclear radiation, the atomic number of the daughter nucleus increases by 1. Identify the nuclear radiation.

Ans– Beta particle

(c) Write a nuclear reaction indicating the nuclear change mentioned in (b).

(d) what is the special name given to the parent and daughter nucleus when this radiation is emitted?

Ans- Isobars

Question 5:

(i) An appliance rated 440 W, 220V is connected across 220V supply.

(a) Calculate the maximum current that the appliance can draw.

(b) Calculate the resistance of the appliance.

(ii) The diagram below shows a vibrating tuning 10rk E mounted on a sound box X. When the vibrating tuning forks A, B, C and D are placed on the sound box Y one by one, it is observed that a louder sound is produced when the tuning fork B is placed on Y.

(a) What is the frequency of tuning fork E?

(b) Why does B produce a louder sound?

(iii)

(a) From the graph of heating curve given below state the melting point and boiling point of the substance.

Ans- Boling point is 40 C

(b) Complete and rewrite the following nuclear reaction by filling the blanks.

Ans-

Question 6:

(i) Study the above figure and answer the following:

(a)What type of vibration does the above figure represent?-Damped Vibration

(b) State one reason for which the amplitude of the vibration decreases with time.—- due to the frictional (or resistive) force which the surrounding medium

(c) Write an example of natural vibrations.—The periodic vibrations of a body in the absence of any external force on it, are called the natural or free vibration. Example – Vibration of the bob of a simple pendulum.

(ii) A certain beam of α particles, β particles and γ radiations travel through a region of electric field produced between two oppositely charged parallel plates A(+) and B(-).

(a) Which of the above three has the maximum speed?—Gamma particles

(b) Which one deviates the most from its original path?– Beta Particle

(c) Which one does not deviate at all when passing through a region of electric or magnetic field? — Gamma Particle

(iii) If a wire of resistance 20Ω gets stretched to thrice its original length:

(a) Calculate the new resistance of the wire.

(b) What happens to the specific resistance of the wire?