Physics Set 1 2021-2022 (English Medium) ICSE Class 10 Question Paper Solution

Pendulums A, B, C and D are tied to a flexible string PQ and are at rest. Pendulum C is disturbed. Which of the following statements is true?

Only pendulum C will start vibrating.

Pendulums A, B, and D will also start vibrating but A and D will vibrate with the maximum amplitude.

Pendulums A, B, and D will also start vibrating.

Vibrations of pendulum C are forced vibrations.

Which of the following is not a characteristic of parallel combination of resistors?

If one resistor is fused, the circuit does not become open.

The total resistance R is given by the formula `1/"R" = 1/"R"_1 + 1/"R"_2 + 1/"R"_3 ...`

The total resistance becomes less than the least resistor, present in the combination.

The current through each resistor always remains the same.

Which one of the following statements is correct?

Live wire has zero potential.

Fuse is connected in a neutral wire.

Potential of live and earth wire is always the same.

Earth wire is used to prevent electric shock.

The diagram below shows a free conductor AB is kept in a magnetic field and is carrying current from A to B. (To avoid confusion complete path of the circuit is not shown) The direction of the force experienced by the conductor will be:

Up

Down

Towards N

Towards S

The diagram below shows a magnet moved near a coil along its axis. Which of the diagram shows correct flow of current during this motion?

The meaning of the statement ‘Specific heat capacity of water is 4200 J kg^-1 K^-1’ is:

Water needs 4200 J heat to raise its temperature by 1 kelvin.

To raise the temperature of water 4200 J of heat is absorbed.

1 kg water absorbs 4200 J heat to increase its temperature by 1 kelvin.

1 kg Water needs 1 kelvin temperature to absorb 4200 J heat.

200 g of ice at 0° C needs ______ heat to melt. [Specific latent heat of ice = 336000 J kg^-1]

6720 J

67200 J

672000 J

67.2 J

The radiation with maximum penetrating power is ______.

γ

β

X-radiation

α

Resonance is ______.

a forced vibration in which amplitude remains constant

a forced vibration in which frequency of forced vibration is greater than the free vibrations of the body

a forced vibration, in which frequency of forced vibration is equal to the free vibrations of the body

a forced vibration, in which frequency of forced vibration is less than the free vibrations of the body

The nuclear radiation which gets deflected towards the negatively charged plate in an electric field is ______.

Gamma

Ultraviolet

Beta

Alpha

(a) Calculate the total resistance across AB.

(b) If a cell of e.m.f 2.4 V with negligible internal resistance is connected across AB then calculate the current drawn from the cell.

Which will absorb more heat, 10 g of ice at 0° C or 10 g of water at 0° C?

For the same mass of ice and ice-cold water, why does ice produce more cooling than ice-cold water?

The diagram below shows an insulated copper wire wound around a hollow cardboard cylindrical tube. Answer the questions that follow:

1. What are the magnetic poles at A and B when the key K is closed?
2. State two ways to increase the strength of the magnetic field in this coil without changing the coil.
3. If we place a soft iron bar at the centre of the hollow cardboard and replace the DC source with an AC source then will it attract small iron pins toward itself when the current is flowing through the coil?

The diagram below shows a cooling curve for 200 g of water. The heat is extracted at the rate of 100 Js^-1. Answer the questions that follow:

1. Calculate specific heat capacity of water.
2. Heat released in the region BC.

(a) Observe the diagram given below and state whether the bulb will glow or not when we switch on K.

(b) Is it safe to handle the bulb when the switch is OFF?

(c) Give a reason for your answer in (b).

Two metals A and B have specific heat capacities in the ratio 2 : 3. If they are supplied the same amount of heat then

Which metal piece will show a greater rise in temperature given their masses is the same?

Two metals A and B have specific heat capacities in the ratio 2:3. If they are supplied same amount of heat then

Which metal piece will have greater mass if the rise in temperature is the same for both metals?

Two metals A and B have specific heat capacities in the ratio 2:3. If they are supplied same amount of heat then

If the mass ratio of metal A and metal B is 3:5 then calculate the ratio in which their temperatures rise.

Two metals A and B have specific heat capacities in the ratio 2:3. If they are supplied same amount of heat then

If specific heat capacity of metal A is 0.26 Jg^{-1 0}C^-1 then calculate the specific heat capacity of metal B.

(a) Which one of the following graphs A or B shows free vibrations in a vacuum and which one shows free vibrations in a medium?

(b) How did you come to this conclusion.

State Faraday's laws of electromagnetic induction.

Name one electrical device which works on Faraday's law of electromagnetic induction principle.

A nucleus \[\ce{^194_82X}\] emits an alpha particle

1. What will be the atomic number of the daughter nucleus Y?
2. What will be the number of neutrons in the daughter nucleus Y?
3. Write a nuclear reaction showing the emission of this particle.

(a) Name the electrical appliance shown in the diagram below.

(b) Name the material of the wire used in this device.

(c) Name two important characteristics of this wire.

1. Define pitch.
2. Two wires AB and CD of same length are stretched by same amount. Which wire will produce a sound of greater pitch on plucking?
3. Give a reason for your answer.

Why is water used as a coolant in radiators of a car?

Name the radioactive isotope used to find the age of fossils. Name the radioactive radiation which it emits?

A beam of α, β and γ rays is travelling through a certain region in space.

1. Arrange them in ascending order of ionising power.
2. Which of the above will pass undeviated if subjected to an electric field?
3. With respect to your answer to part (b) above, what will be the change in the nucleus of an atom after such a ray is emitted.

A change in amplitude of a sound wave is noticed.

1. Which characteristic of sound is affected due to the above change?
2. How is amplitude related to your answer to part (a) above?
3. What happens to the quality of the sound?

An electric bulb is rated ‘240 V, 100 W’.

1. What information can you get from the above statement?
2. What will happen if this bulb is connected across 220 V?
3. Calculate the resistance of the bulb.
4. Also find the energy consumed by the bulb in 10 minutes.