Solving ICSE Class 10 Physics Previous Year Question Papers ICSE Class 10 Physics Question Paper 2022 Semester 2 is the best way to boost your preparation for the board exams.
ICSE Class 10 Physics Question Paper 2022 Solved Semester 2
Time : 1½ hour
Maximum Marks: 40
Genral Instructions
- Answers to this Paper must be written on the paper provided separately.
- You will not be allowed to write during the first 10 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.
- Attempt all questions from Section A and any three questions from Section B.
- The marks intended for questions are given in brackets [ ].
Section – A
(Attempt all questions)
Question 1.
Choose the correct answer to the questions from the given option. (Do not copy the question. Write the correct answer only.) [10]
(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 ampli-tude.
Answer:
(d) the vibrations with a constant frequency and constant amplitude.
(ii) The diagram below shows four sound waves. Which sound has the highest pitch ?
Answer:
(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 defect towards east
(c) the needle will turn in the opposite direction Le. towards south
(d) the needle will deflect towards west.
Answer:
(d) the needle will deflect towards west.
(vi) A coil wound around a piece of soft iron can become an electromagnet only when :
(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) 4 Jg-1 °C-1
(d) 4.2 Jg-1 °C-1
Answer:
(c) 4 Jg-1 °C-1
(viii) Water is used in car radiators because :
(a) it is a good conductor of heat.
(b) it conducts heat faster as compared to the other substances and cools the engine quickly.
(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 :
(a) x-radiation
(b) α-radiation
(c) γ-radiation
(d) β-radiation
Answer:
(b) α-radiation
(x) To study the age of excavated material of archaeological signification w e study the rate of decay of an isotope of:
(a) Uranium
(b) Cobalt
(c) Carbon
(d) Chlorine
Answer:
(c) Carbon
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. [3]
(a) After studying the circuit and the magnetic compass carefully, state whether the switch S1 is open or closed.
Answer:
The switch is closed.
(b) How did you arrive at the conclusion in (a) ?
Answer:
As the magnetic compass is deflected.
(c) What is the purpose of placing the magnetic compass in the above setup ?
Answer:
The compass allows us to find whether a magnetic field is generated or not.
(ii) (a) Give an important reason for copper to be used as a material for a calorimeter. [3]
Answer:
Because copper is a good conductor of heat.
OR
Copper has low specific heat capacity and thus it reaches the equilibrium temperature quickly by absorbing a small amount of heat. It is also highly malleable and hence a very thin box of small mass can be made thus decreasing the heat capacity of the box.
(b) Calculate the thermal capacity of 40 g of water.
[Specific heat capacity of water = 4200 Jkg-1 °C-1] [4]
Answer:
Thermal capacity of water (Q) = mCT, where T is the change in temperature of water
= 40 × 4.2 × T= 168TJ
(iii)
In the above circuit diagram, calculate : [3]
(a) the external resistance of the circuit
(b) the current l2
(c) the current I.
Answer:
(a) Resistors 12Ω and 8Ω are connected in parallel.
This combination is connected in series with the 2 Ω resistor.
In parallel, we have R = \(\frac{12 \times 8}{12+8}\) = \(\frac{96}{20}\)
= \(\frac{24}{5}\) = 4.8Ω
Net resistance = 2 + 4.8 = 6.8Ω
(b) Now, I1R1 = I2R2 or I2 = \(\frac{\mathrm{I}_1 \mathrm{R}_1}{\mathrm{R}_2}\)
= \(\frac{0.4 \times 12}{8}\) = 0.6A
(c) I = I1 + I2 = 0.4 + 0.6 = 1A
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. [3]
(a) Brown
(b) Green
(c) Light blue
Answer:
(i) A – Green,
B – Brown,
C – Light blue
(ii) (a) Why does it become colder after a hailstorm than during or before the hailstorm? [3]
(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.
Answer:
(ii) (a) Before and during the hailstorm there is plenty of heat present in the atmosphere. But after the hailstorm ice absorbs heat energy required for melting from the surrounding, so the temperature of surrounding falls and we feel cold.
(b) The statement is true.
(iii) A metal piece of mass 420 g present at 80°C is dropped in 80 g of water present at 20°C in a calorimeter of mass 84 g. If the final temperature of the mixture is 30°C then calculate the specific heat capacity of the metal piece. [4]
[Specific heat capacity of water = 4.2 Jg-1 °C-1,
Specific heat capacity of the calorimeter = 200 Jkg-1 °C-1]
Answer:
[By the principle of calorimetry]
Heat released by the metal piece Heat absorbed by the calorimeter + Heat absorbed by the water.
Final temperature of the mixture = 30°C
Mass of metal piece = 420 g
Temperature of metal piece = 80°C
Specific heat capacity of metal piece
= c (to be found)
Heat energy released by metal piece
= mcΔt = 420 × c × (80 – 50) = 21000c J
Mass of calorimeter = 84 g
Temperature of calorimeter = 20°C
Specific heat capacity of calorimeter
= 200 J kg-1°C-1 = 0.200 J g-1°C-1
Heat energy absorbed by the calorimeter
= mcΔt = 84 × 0.2 × (30 – 20) = 168J
Mass of water = 80 g
Temperature of water = 20°C
Specific heat capacity of water = 4.2Jg-1°C-1
Heat energy absorbed by water
= mcΔt
= 80 × 4.2 × (30 – 20) = 3360 J
By the principle of calorimetry,
21000c = 3360 + 168
21000c = 3528
c = \(\frac{3528}{21000}\)
= 0.168 J g-1 K-1
Question 4.
(i) Rohit playing a flute and Anita playing a piano emit sounds of same pitch and loudness. [3]
(a) Name one characteristic that is different for waves from the two different instruments.
Answer:
(a) Timbre
(b) If now the loudness of the sound from flute becomes four times that of the sound from piano, then write the value of the ratio Ar: Ar. (Ar – amplitude of sound wave from flute, Ar – amplitude of sound wave from piano)
Answer:
AF : AP = 2 : 1
(c) Define ‘Pitch’ of a sound.
Answer:
Pitch is defined as the characteristic of sound which is used for differentiating between the shrill and flat sound.
(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. [3]
(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 ?
Answer:
(a) Magnetic field and current. Force is proportional to both the magnetic field and the current.
(b) Fleming’s left hand rule.
(iii) (a) What is nuclear energy ? [4]
(b) After emission of a nuclear radiation, the atomic number of the daughter nucleus increases by 1. Identify the nuclear radiation.
(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 ?
Answer:
(a) The energy released during nuclear fission or
fusion.
(b) Beta decay
(c)
(d) Isobars
Question 5.
(i) An appliance rated 440 W, 220 V is connected across 220 V supply. [3]
(a) Calculate the maximum current that the appliance can draw.
(b) Calculate the resistance of the appliance.
Answer:
(a) I = \(\frac{P}{V}\) = \(\frac{440}{220}\) = 2A
(b) R = \(\frac{\mathrm{V}^2}{\mathrm{P}}\) = \(\frac{(220)^2}{440}\) = 110Ω
(ii) The diagram below shows a vibrating tuning fork 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 turning fork B is placed on Y. [3]
(a) What is the frequency of tuning fork E ?
(b) Why does B produce a louder sound ?
Answer:
(a) 320 Hz
(b) Resonance
(iii) (a) From the graph of heating curve given below state the melting point and boiling point of the substance. [4]
(b) Complete and rewrite the following nuclear reaction by filling the blanks.
235U → 90Th + 42He
Answer:
(a) Melting point 40°C, boiling point 160°C
(b) \({ }_{92}^{235} U\) → \(9_{90}^{231} \mathrm{Th}\) + \({ }_2^4 \mathrm{He}\)
Question 6.
(i) Study the above figure and Answer the following : [3]
(a) What type of vibration does the above figure represent ?
Answer:
Damped vibrations.
(b) State one reason for which the amplitude of the vibration decreases with time.
Answer:
Loss of energy because of friction.
(c) Write an example of natural vibrations.
Answer:
Vibration of the bob of a simple pendulum.
(ii) A certain beam of a particles, p particles and y radiation travel through a region of electric field produced between two oppositely charged parallel plates A (+) and B (-). [3]
(a) Which of the above three has the maximum speed ?
(b) Which one deviates the most from its original path ?
(c) Which one does not deviate at all when passing through a region of electric or magnetic field ?
Answer:
(a) Gamma radiation
(b) Beta particle
(c) Gamma
(iii) If a wire of resistance 2 Ω gets stretched to thrice its original length : [4]
(a) Calculate the new resistance of the wire.
(b) What happens to the specific resistance of the wire ?
Answer:
(a) New resistance
RN = n2R = 32 × 2= 18Ω
(b) No change