Physics Official 2023-2024 (English Medium) ICSE Class 10 Question Paper Solution

When a bell fixed on a cycle rings, then the energy conversion that takes place is ______.

Gravitational potential energy to sound energy.

Kinetic energy to sound energy.

Sound energy to electrical energy.

Sound energy to mechanical energy.

A door lock is opened by turning the lever (handle) of length 0.2 m. If the moment of force produced is 1 Nm, then the minimum force required is ______.

5 N

10 N

20 N

0.2 N

A force 'F' moves a load from A to C as shown in the figure below. For the calculation of the work done, which of these lengths would you use as the displacement?

3m

4m

5m

7m

A radioactive nucleus containing 128 nucleons emits a β-particle. After β- emission the number of nucleons present in the nucleus will be ______.

128

129

124

127

Assertion (A): Ultraviolet radiations is scattered more as compared to the microwave radiations.

Reason (R): Wavelength of ultraviolet radiation is more than the wavelength of microwave radiation.

Both A and Rare true.

A is true but R is false.

A is false but R is true.

Both A and Rare false.

When the stem of vibrating tuning fork is pressed on a table, the tabletop starts vibrating. These vibrations are definitely an example of ______.

Resonance

Natural vibrations

Forced vibrations

Damped vibrations

Which of the following is a class III lever?

Pair of scissors

Wheelbarrow

Crowbar

Human forearm

The specific resistance of a conductor depends on its ______.

Length

Material

Area of cross section

Radius

Identify the option that displays the correct wiring with correct colour code:

The potential difference between terminals of a cell in a closed electric circuit is ______.

Terminal voltage

Electro motive force

Voltage drop

None of these

During melting of ice at 0°C the ______.

Energy is released and temperature remains constant.

Energy is absorbed and temperature remains constant.

Energy is released and temperature decreases.

Energy is absorbed and temperature increases.

Linear magnification (m) produced by a concave lens is ______.

m < 1

m > l

m = 1

m = 2

A radioactive element is placed in an evacuated chamber. Then the rate of radioactive decay will ______.

Decrease

Increase

Remain unchanged

Depend on the surrounding temperature

The graph given below shows heat energy supplied against change in temperature when no energy is lost to the surroundings. The slope of this graph will give:

Specific heat capacity

Latent heat of fusion

Latent heat of vaporization

Heat capacity

A block of glass is pushed into the path of the light as shown below. Then the converging point x will:

Move away from the slab.

Move towards the slab.

Not shift.

Move towards the left side of the lens.

In the following atoms, which one is a radioisotope? Give one use of this isotope.

O¹⁶, C¹⁴, N¹⁴, He⁴

Name the class of the lever shown in the picture below:

When a stone tied to a string is rotated in a horizontal plane, the tension in the string provides ______ force necessary for circular motion.

Work done by this force at any instant is ______.

A non uniform beam of weight 120 N pivoted at one end is shown in the diagram below. Calculate the value of F to keep the beam in equilibrium.

What is the advantage of using a block and tackle system over a single movable pulley?

Why should she connect more number of pulleys in the upper fixed block?

Sumit does 600 J of work in 10 min and Amit does 300 J of work in 20 min. Calculate the ratio of the powers delivered by them.

1. Resistance
2. Intensity of light

Rohan conducted experiments on echo in different media. He observed that a minimum distance of 'x' meters is required for the echo to be heard in oxygen and 'y' meters in benzene. Compare 'x' and 'y'. Justify your answer.

Speed of sound in oxygen: 340 ms^-1

Speed of sound in benzene: 200 ms^-1

In a reading glass what is the position of the object with respect to the convex lens used?

In a reading glass what is the position of the object with respect to the concave lens used?

A fuse is rated 5 A. Can it be used with a geyser rated 1540 W, 220 V Write Yes or No. Give supporting calculations to justify your answer.

State two factors affecting the coil's rotation speed in a D.C. motor.

How much heat is required to convert 500 g of ice at 0°C to water at 0°C? The latent heat of fusion of ice is 330 Jg^-1.

Copy and complete the nuclear reaction by filling in the blanks.

\[\ce{_92U^235 + _0n^1 -> _56Ba^{\underline{\phantom{....}}} + \underline{\phantom{..}}Kr^92 + 3 _0n^1}\]

The image of a candle flame placed at a distance of 36 cm from a spherical lens, is formed on a screen placed at a distance of 72 cm from the lens. Calculate the focal length of the lens and its power.

Below is an incomplete table showing the arrangement of electromagnetic spectrum in the increasing order of their wavelength. Complete the table:

1. Identify the radiation A.
2. Name the radiation used to detect fracture in bones.
3. Name one property common to both A and Radio waves.

Why do we use red colour as a danger signal on the top of a skyscraper?

The diagram below shows the path of a blue ray through the prism:

1. Calculate the critical angle of the material of the prism for blue colour.
2. What is the measure of the angle of this prism (A)?
3. Which colour should replace the blue ray, for the ray to undergo Total Internal Reflection?
   

1. Refractive index of glass with respect to water is `9/8`. Find the refractive index of water with respect to glass.
2. Name the principle used to find the value in part (a).
3. If we change the temperature of water, then will the ratio `9/8` remain the same? Write Yes or No.

Light travels a distance of '10x' units in time 't₁' in vacuum and it travels a distance of 'x' units in time 't₂' in a denser medium. Using this information answer the question that follows:

'Light covers a distance of '20x' units in time 't₁' in diamond'. State true or false.

True

False

Light travels a distance of '10x' units in time 't₁' in vacuum and it travels a distance of 'x' units in time 't₂' in a denser medium. Using this information answer the question that follows:

Calculate the refractive index of the medium in terms of 't₁' and 't₂'.

A monochromatic ray of light is incident on an equilateral prism placed at minimum deviation position with an angle of incidence 45° as shown in the diagram?

1. Copy the diagram and complete the path of the ray PQ.
2. State two factors on which the angle of deviation depends.
   

A hollow ice cream cone has height 6 cm.

1. Where is the position of its center of gravity from the broad base?
2. Will its position change when it is filled completely with honey? Write Yes or No.

Two identical marbles A and B are rolled down along Path 1 and Path 2 respectively.

Path 1 is frictionless and Path 2 is rough.

1. Which marble will surely reach the next peak?
2. Along which path/s the mechanical energy will be conserved?
3. Along which path/s is the law of conservation of energy obeyed?

Copy and complete the labelled diagram connecting the two pulleys with a tackle to obtain Velocity Ratio= 2.

If Load = 48 kgf and efficiency is 80% then calculate:

1. Mechanical Advantage.
2. Effort needed to lift the load.
   

Name the waves used in SONAR.

In the above diagram Lata stands between two cliffs and claps her hands.

Determine the time taken by her to hear the first echo. Speed of sound in air 320 ms^-1.

Complete the following radioactive reaction:

\[\ce{^-_-X -> ^-_-Y + ^4_2He -> ^234_91Z + ^0_-1e}\]

Uranium is available in two forms U-235 and U-238. Which of the two isotopes of Uranium is more fissionable?

1. Name the phenomenon illustrated by the above experiment.
2. Why is a loud sound heard at this particular length?
3. If the present tuning fork is replaced with a tuning fork of higher frequency, should the length of the air column increase or decrease to produce a loud sound? Give a reason.

The voltage - current readings of a certain material are shown in the table given below:

Study the table.

1. State whether the conductor used is ohmic or non-ohmic.
2. Justify your answer.
3. State Ohm's law.

Below is the diagram of a transformer:

1. Identify the type of transformer.
2. In this type of transformer which of the wire is thicker, the primary or the secondary? Give a reason.

Study the diagram:

1. Calculate the total resistance of the circuit.
2. Calculate the current drawn from the cell.
3. State whether the current through 10 Ω resistor is greater than, less than or equal to the current through the 12 Ω resistor.

85 g of water at 30°C is cooled to 5°C by adding certain mass of ice. Find the mass of ice required.

[Specific heat capacity of water = 4 .2 Jg^-I°C^-1, Specific latent heat of fusion = 336 Jg^-1]

Why does it become pleasantly warm when the lakes start freezing?

Water freezes to form ice. What change would you expect in the average kinetic energy of the molecules?

Which has more heat: 1 g ice at 0℃ or 1g water 0℃? Give reason.

State one factor that affects the magnitude of induced current in an AC generator.

1. Name the rule that is used to predict the direction of deflection of the magnetic compass.
2. State the direction of current in the conductor (X to Y or Y to X) when the circuit is complete.
3. If resistance R is increased, then what will be the effect on the magnetic lines of force around the conductor?