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ICSE Class X Board Examination

ICSE Physics (Science Paper 1) — Board Examination 2025

Board2025Subject code 521
Open source paper at oswaal360.com (opens in a new tab)
Board
ICSE Class X Board Examination
Class
Class 10
Subject
Physics
Year
2025
Total marks
Not verified
Duration
Not verified

Verification and rights

Follows the published ICSE syllabus structure and links back to the source, but has not been reconciled line by line against a Council document.

Imported board paper from Oswaal Books (reproduction of CISCE board paper) on 2026-08-29.

Questions in this paper

Section A

  1. 1((i))Choose the correct answers to the questions from the given options. [15] (Do not copy the questions, write the correct answers only.)
    A body is acted upon by two equal and opposite forces, that are NOT along the same straight line. The
    body will:
  2. 1((ii))Choose the correct answers to the questions from the given options. [15] (Do not copy the questions, write the correct answers only.)
    Which among the following is a vector quantity?
  3. 1((iii))Choose the correct answers to the questions from the given options. [15] (Do not copy the questions, write the correct answers only.)
    What is the correct energy transformation during burning of a candle?
  4. 1((iv))Choose the correct answers to the questions from the given options. [15] (Do not copy the questions, write the correct answers only.)
    When a ray of light passes from one optical medium to another, which of the following physical quantities
    does NOT change?
  5. 1((v))Choose the correct answers to the questions from the given options. [15] (Do not copy the questions, write the correct answers only.)
    Which one of the following combinations is the correct ascending order of electromagnetic waves in
    terms of wavelength?
  6. 1((vi))Choose the correct answers to the questions from the given options. [15] (Do not copy the questions, write the correct answers only.)
    For a lever, a graph is plotted with load on Y-axis and effort on X-axis. Which of the following represents
    the slope of the graph?
    (a) Mechanical advantage (b) Velocity ratio
    1 1
    (c) (d)
    Velocity ratio Mechanical advantage
  7. 1((vii))Choose the correct answers to the questions from the given options. [15] (Do not copy the questions, write the correct answers only.)
    For a real image formed by a convex lens, the ratio of I : O = 2 : 5, then the object is:
    (I is the height of the image and O is the height of the object)
  8. 1((viii))Choose the correct answers to the questions from the given options. [15] (Do not copy the questions, write the correct answers only.)
    A ray of light is incident normally on a face of an equilateral prism. The ray gets totally reflected at the
    second refracting surface. The total deviation produced in the path of the ray is:
  9. 1((ix))Choose the correct answers to the questions from the given options. [15] (Do not copy the questions, write the correct answers only.)
    In a closed circuit containing a bulb and a cell, the electromotive force (ε) and the terminal voltage (V) is
    related as.
    (Given I is current and r is internal resistance.)
  10. 1((x))Choose the correct answers to the questions from the given options. [15] (Do not copy the questions, write the correct answers only.)
    A metal piece of mass 5 g has thermal capacity 2.5 JK-1. If the mass of the metal is tripled, then its specific
    heat capacity will be:
  11. 1((xi))Choose the correct answers to the questions from the given options. [15] (Do not copy the questions, write the correct answers only.)
    Assertion (A): As the level of water in a tall measuring cylinder kept under running tap rises, the pitch
    of sound gradually increases.
    Reason (R): Frequency of sound is inversely proportional to the length of the water column.
  12. 1((xiii))Choose the correct answers to the questions from the given options. [15] (Do not copy the questions, write the correct answers only.)
    A radioactive element P emits one a-particle and transforms to a new element Q.
    What will be the position of the element Q in the periodic table?
  13. 1((xiv))Choose the correct answers to the questions from the given options. [15] (Do not copy the questions, write the correct answers only.)
    Each of the substances given below is supplied with same amount of heat.
    Which one will attain the highest temperature?
    Substance Lead Aluminium Copper Iron
    Specific heat capacity (cal/g°C) 0.031 0.21 0.095 0.115
  14. 1((xv))Choose the correct answers to the questions from the given options. [15] (Do not copy the questions, write the correct answers only.)
    The following figure shows a small bar magnet falling freely through a copper ring. For the observer at
    A, the direction of the induced current will be:
    S
    N A
    Copper ring
    S
    N
  15. 2((i))Complete the following by choosing the correct answers from the bracket:6 marks
  16. 2((ii))A non-uniform kite is hanging freely from the branch of a tree as shown. Study the figure and answer
    the following:
    Branch
    of a tree
    Kite P R
    Q S
    (a) Fill in the blank.
    __________ (P, Q, R or S) is the most probable position of its centre of gravity.
    (b) Support your answer to (a) with a reason.    2 marks
  17. 2((iii))The displacement–time graph of a sound wave produced by a vibrating wire is shown below.
    Displacement
    Q
    P R Time
    S
    (a) How will you adjust the tension in the wire, to reduce the length of PR?
    (b) Which characteristic of sound is affected by the reduction in the length of PR?    2 marks
  18. 3((i))A ray of light enters a rectangular glass slab submerged in water at an angle of incidence 55°. Does this
    ray undergo total internal reflection when it moves from water to glass? Justify your answer. (The critical
    angle for glass–water interface is 54°)    2 marks
  19. 3((ii))According to the NEW colour convention which colour of wire is connected to:
    (a) the metal body of the appliance
    (b) the switch of the appliance?    2 marks
  20. 3((iii))(a) Which of the two, alternating current or direct current, produces a varying magnetic field when it
    flows through a conductor?
    (b) State the frequency of the alternating current supply in India.    2 marks
  21. 3((iv))Calcuate the amount of heat absorbed by 200 g of paraffin wax to melt completely at its melting point.
    [Specific latent heat of fusion of paraffin wax = 146 Jg-1]    2 marks
  22. 3((v))Copper wire is wound around a steel bar FT. Current is allowed to pass through the coil for some time
    and then the bar is removed.
    (a) Draw only the magnetised bar FT and mark its poles.
    (b) Trace two magnetic lines of force around FT clearly indicating the direction.
    F T    2 marks
  23. 3((vi))A current flows through a metallic conductor for a long period of time. State the change you would
    expect in its:
    (a) Resistance
    (b) Resistivity    2 marks
  24. 3((vii))Curium is a radioactive element with the symbol 96 Cm named in honour of Madam Curie. The graph of
    number of protons vs number of neutrons for some elements are shown below:
    number of
    protons
    R Q P
    94 S
    number of
    146 148 150 152 154 neutrons
    (a) Which point on the graph indicates the element Cm?
    (b) Which point on the graph indicates daughter nucleus after Cm undergoes radioactive decay of 1α
    followed by 2β?
    (c) State the mass number of the daughter nucleus.
    (Attempt any four questions from this Section.)    3 marks

Section B

  1. 4((ii))A rectangular glass block of refractive index 1.5 has an air bubble trapped inside it as shown in the
    diagram. When seen from the surface AB, it appears to be 4 cm deep.
    A Glass block B
    air bubble 15 cm
    D C
    (a) Calculate the actual depth of the air bubble from the surface AB.
    (b) For which colour of light, bluc or yellow, the apparent depth will be greater?
    (c) Turning the glass block upside down, DOES NOT change the apparent depth of the air bubble.
    State True or False.    3 marks
  2. 4((iii))(a) An object is placed at 2F position of a convex lens. Draw a ray diagram showing the formation of the
    image.
    (b) How will the size of the image change if we, ONLY replace the lens in the above arrangement with
    another lens of a greater focal length?    4 marks
  3. 5((i))An object is placed in front of a concave lens at a distance of 45 cm from it. If its image is formed at a
    distance of 30 cm from the lens, calculate the focal length of the lens.
  4. 5((ii))Two rays PQ and RS are incident on a rectangular glass block as shown in the diagram. Observe the
    diagram and answer the questions that follow.
    P R
    35° 35°
    Q S
    Glass
    block
    Which of these two rays will:
    (a) have greater lateral displacement on emerging out of the block?
    (b) travel with greater speed in the block?
    (c) scatter more in the atmosphere?    3 marks
  5. 5((iii))(a) Name the radiations:
    1. for which a quartz prism is used to study the spectrum.
    2. which are used in remote sensing devices.
    3. which are used in traffic signals in India.
    (b) Name one property common to all electromagnetic radiations.    4 marks
  6. 6((i))Akash takes a uniform metre scale and suspends a weight of 2 N at one end ‘X’, and a weight of 5 N on
    the other end ‘Y”. He then balances the ruler horizontally on a knife edge placed at 70 cm from X. Draw
    a diagram of the arrangement and calculate the weight of the ruler.    3 marks
  7. 7((i))Draw a block and tackle system of pulleys with velocity ratio equal to 3.3 marks
  8. 7((ii))A submarine in the sea, sends ultrasonic ping and a stopwatch is started. simultaneously. The stopwatch
    stops on receiving the reflected wave from an obstacle and reads 1 minute 40 seconds. Calculate the
    distance of the obstacle from the submarine (Speed of sound in water 1500 ms-1)    3 marks
  9. 7((iii))The diagrams given below show two sound boxes A and B with wires of same length (l) and tension (10
    kgf) but different cross-sectional areas. Simultaneously, vibrating tuning forks of frequency 300 Hz are
    placed on the boxes A and B. The paper rider falls off in case of B but not in case of A.
    l l
    A B
    Paper rider Paper rider
    10 kgf 10 kgf
    (a) Name and explain the phenomenon responsible for the falling off of the paper rider in B.
    (b) The wire A resonates with a tuning fork of frequency ‘f ’. Is ‘f ’ greater than, less than or equal to 300 Hz?
    Justify your answer.    4 marks
  10. 8((i))The diagram shows wiring in a meter room of a building.
    Y
    X Z
    (a) What is the current rating of device X?
    (b) What is the difference between the switch Z shown in the diagram and the switches you use to
    operate different appliances at home?
    (c) What is the unit of the physical quantity displayed in Y?    3 marks
  11. 9((i))30 g of ice at 0°C is used to bring down the temperature of a certain mass of water at 70°C to 20°C. Find
    the mass of water [Specific heat capacity of water = 4.2 Jg-1°C-1 and specific latent heat of ice = 336 Jg-1.]    3 marks
  12. 9((ii))(a) A certain amount of heat will warm 1 g of material X by 10°C and 1 g of material Y by 40°C. Which
    material has higher specific heat capacity?
    (b) Which material, X or Y, would you select to make a calorimeter?
    (c) The specific heat capacity of a substance remains the same when it changes its state from solid to
    liquid. State True or False.    3 marks