Physics Official 2022-2023 (English Medium) ICSE Class 10 Question Paper Solution

Clockwise moment produced by a force about a fulcrum is considered to be ______.

Positive

Negative

Zero

None of these

When the speed of a moving object is doubled, then its kenetic energy ______.

remains the same

decreases

is doubled

becomes four times

The energy conversion in a washing machine is from ______.

magnetic to electrical

electrical to mechanical

electrical to magnetic

magnetic to electrica

Which of the following radiations suffer maximum deflection in a magnetic field?

Alpha radiations

Beta radiations

Gamma radiations

X-radiations

Speed of blue light in water is ______.

more than green light

more than orange light

more than violet light

more than red light

A concave lens produces only ______ image.

real, enlarged

virtual, enlarged

virtual, diminished

real, diminished

When a body vibrates under a periodic force, the vibrations of the body are ______.

natural vibrations

Damped vibrations

Forced vibrations

Resonant vibrations

Two notes are produced from two different musical instruments, such that they have same loudness and same pitch. The produced notes differ in their ______.

Waveform

Frequency

Wavelength

Speed

When a current I flows through a wire of resistance R for time t then the electrical energy produced is given by ______.

I²Rt

IR²t

IRt

IRt²

Choose the correct relation for e.m.f. (ε) and terminal voltage V:

ε = V (always)

V > ε (always)

V < ε [when cell is in use]

None of the above

If the strength of the current flowing through a wire is increased, the strength of the magnetic field produced by it ______.

increases

increases

remains the same

first increases then decreases

Specific latent heat of a substance ______.

is directly proportional to the mass

is directly proportional to the change in the temperature

depends on the material

is inversely proportional to the mass

Specific heat capacity of a substance X is 1900 Jkg^-1°C^-1 means ______.

Substance X absorbs 1900 J for 1°C rise in temperature

1 kg of substance X absorbs 1900 J heat for 1°C rise in temperature

1 kg of substance X absorbs 1900 J heat to increase the temperature

1 kg of substance X absorbs 1900 J heat to cool down by 1°C

When a ray of light travels normal to the given surface, then the angle of refraction is ______.

180°

0°

90°

45°

Small air bubbles rising up a fish tank appear silvery when viewed from some particular angle is due to the ______.

reflection

refraction

dispersion

total internal reflection

When does the nucleus of an atom tend to become radioactive?

Name a single pulley in which displacement of load and effort is not the same.

State one advantage of single movable pulley.

At which point is the centre of gravity situated in a triangular lamina?

When this triangular lamina is suspended freely from any one vertex, what is the moment of force produced by its own weight in its rest position?

The diagram shows wheel O pivoted at point A. Three equal forces F₁, F₂ and F₃ act at point B on the wheel.

1. Which force will produce maximum moment about A?
2. Give a reason for your answer in (a).

What should be the angle between the direction of force and the direction of displacement, for work to be negative?

Name the physical quantity obtained using the formula `U/h`, where `U` is the potential energy and h is the height.

Calculate the power spent by a crane while lifting a load of mass 2000 kg, at velocity of 1.5 ms^-1. (g = 10 ms^-2)

A metal foot ruler is held at the edge of a table. It is pressed at its free end and then released. It vibrates.

1. Name the vibrations produced.
2. State one way to increase the frequency of these vibrations.

'A geyser is rated 240 W-220 V'. Explain the meaning of this statement.

Is it possible for a concave lens to form an image of size two times that of the object? Write Yes or No.

What will happen to the focal length of the lens if a part of the lens is covered with an opaque paper?

Which electrical component protects the electric circuit in case of excess current and which can also be used as a switch?

Name the wire to which this electrical component is connected in an electric circuit. 

A copper conductor is placed over two stretched copper wires whose ends ate connected to a D.C. supply as shown in the diagram.

1. What should be the magnetic poles at the points A and B lying on either side of the conductor to experience the force in the upward direction?
2. Name the law used to find these polarities.

Thermal capacities of substances A and B are same. If mass of A is more than mass of B then:

Which substance will have more specific heat capacity?

Thermal capacities of substances A and B are same. If mass of A is more than mass of B then:

Which substance will show greater rise in temperature if the same amount of heat is supplied to both?

How is the radioactivity of a radio isotope affected if it undergoes a chemical change? Give a reason for your answer.

The diagram below shows the ray OP travelling through an equilateral prism of a certain material.

1. Calculate the value of i₂, if the angle of deviation is 43°.
2. What is the ray QS called?

Copy the diagram given below and complete the path of the light ray PQ, as it emerges out of the prism by necessary angles. The critical angle of glass is 42°:

The diagram below shows two parallel rays A (Orange) & B (Blue) incident from air, on air-glass boundary.

1. Copy and complete the path of the rays A and B.
2. How do the speeds of these rays differ in glass?
3. Are the two refracted rays in glass parallel? Give a reason.

A convex lens of focal length 10 cm is placed at a distance of 60 cm from a screen. How far from the lens should an object be placed so as to obtain a real image on the screen?

A coin kept inside water [µ = 4/3] when viewed from air in a vertical direction appears to be raised by 3.0 mm. Find the depth of the coin in water.

How is the critical angle related to the refractive index of a medium?

Infrared radiations are used in warfare. Explain with reason, why?

A ray of light is incident at 45° on an equilateral prism in the diagram below.

1. Name the phenomenon exhibited by the ray of light when it enters and emerges out of the prism.
2. State the cause of the above phenomenon mentioned by you.

A block and tackle system of pulleys has a velocity ratio of 4.

1. Draw a labelled diagram of the system indicating clearly the points of application and directions of load and effort.
2. What is the value of the mechanical advantage of the given pulley system if it is an ideal pulley system?

A metre scale of weight 50 gf can be balanced at 40 cm mark without any weight suspended on it.

1. If this ruler is cut at its centre then state which part [0 to 50 cm or 50 to 100 cm] of the ruler will weigh more than 25 gf.
   
2. What minimum weight placed on this metre ruler can balance this ruler when it is pivoted at its centre?

A car of mass 120 kg is moving at a speed 18 km/h and it accelerates to attain a speed of 54 km/h in 5 seconds. Calculate:

1. the work done by the engine.
2. the power of the engine.

Which characteristic of sound is affected due to the larger surface of a school bell?

Calculate the distance covered by the Ultrasonic wave having a velocity of 1.5 kms^-1 in 14 s, when it is received after reflection by the receiver of the SONAR.

Complete the following nuclear changes:

\[\ce {^238_92 P ->\underset{-}-{Q} + ^4_2He->\underset{-}-{R} + ^0_-1e}\]

Name the nuclear radiation which has the highest ionizing power.

We are able to see the T.V. channels clearly when we set T.V. on auto-tuning.

1. Which phenomemon led to the clear visibility of the channels, due to auto-tuning?
2. Define the above phenomenon mentioned by you.
3. Give any one more example of this phenomenon.

Define specific resistance.

What happens to the specific resistance of a conductor if its length is doubled?

Name a substance which the specific resistance remains almost unchanged by the increase in temperature.

Which nuclear radiation will travel undeviated in an electric field?

How can one stop the radiations escaping from a nuclear reactor in a nuclear power plant?

Name one internal source of background radiations.

Find the value of current I drawn from the cell.

1. Calculate the current I.
2. Calculate the terminal voltage.

Calculate the total amount of heat energy required to melt 200 g of ice at 0°C to water at 100°C. (Specific latent heat of ice = 336 Jg^-1, specific heat capacity of water = 4.2 Jg^-1 °C^-1)

What is the principle of Calorimetry?

Name the material used for making a Calorimeter.

Write one characteristic property of the material chosen for making a calorimeter.

The diagram below shows a cardboard on which iron filings are kept. A wire bent in the form of a loop is seen passing through the cardboard. When current flows through it, the iron filings arrange themselves as shown below.

1. State the polarities of the battery at A and B.
2. State the effect on the magnetic field if an iron rod is held along the axis of the coil.
3. State one way to:
   1. Change the polarity of the coil.
   2. Decrease the strength of the magnetic field around the coil.