Update ICSE - X Physics Board Paper 2024.txt

ICSE - X Physics Board Paper 2024.txt

@@ -14,495 +14,6 @@ The intended marks for questions or parts of questions are given in brackets [ ]
 
 SECTION A - 40 MARKS
 
-(Attempt all questions from this Section.)
-Question 1 
-[15]
-		Choose the correct answers to the questions from
-the given options.
-		(Do not copy the questions, write the correct
-answers only.)
-(i) When a bell fixed on a cycle rings, then the energy
-conversion that takes place is
-		(a) gravitational potential energy to sound energy
-		(b) kinetic energy to sound energy
-		(c) sound energy to electrical energy
-		(d) sound energy to mechanical energy
-(ii) 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
-		(a) 5 N
-(b) 10 N
-		(c) 20 N
-(d) 0.2 N
-(iii) 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?
-
-		Reason (R): Wavelength of ultraviolet radiation is
-more than the wavelength of microwave radiation.
-		(a) Both A and R are true.
-		(b) A is true but R is false.
-		(c) A is false but R is true.
-		(d) Both A and R are false.
-(vi) When the stem of vibrating tuning fork is pressed on
-a table, the tabletop starts vibrating. These vibrations
-are definitely an example of
-		(a) resonance
-(b) natural vibrations
-		(c) forced vibrations
-(d) damped vibrations
-(vii) Which of the following is a class III lever?
-		(a) Pair of scissors
-(b) Wheelbarrow
-		(c) Crowbar
-(d) Human forearm
-(viii) The specific resistance of a conductor depends on its
-		(a) length
-(b) material
-		(c) area of cross section (d) radius
-(ix) Identify the option that displays the correct wiring
-with correct colour code
-		(a)
-
-		(b)
-		(a) 3 m
-(b) 4 m
-		(c) 5 m
-(d) 7 m
-(iv) A radioactive nucleus containing 128 nucleons
-emits a b-particle. After b-emission the number of
-nucleons present in the nucleus will be
-		(a) 128
-(b) 129
-		(c) 124
-(d) 127
-(v) Assertion (A): Ultraviolet radiations are scattered
-more as compared to the microwave radiations.
-
-Oswaal ICSE PHYSICS, Class-X
-
-2
-(c)
-
-		(c) Latent heat of vaporization
-		(d) Heat capacity
-(xv) A block of glass is pushed into the path of the light as
-shown below. Then the converging point X will
-
-(d)
-
-(x) The potential difference between terminals of a cell
-in a closed electric circuit is
-		(a) terminal voltage
-		(b) electro motive force
-		(c) voltage drop
-		(d) none of these
-(xi) During melting of ice at 0°C the
-		(a) energy is released and temperature remains
-constant.
-		(b) energy is absorbed and temperature remains
-constant.
-		(c) energy is released and temperature decreases.
-		(d) energy is absorbed and temperature increases.
-(xii) Linear magnification(m) produced by a concave lens
-is
-		(a) m < 1
-(b) m > 1
-		(c) m = 1
-(d) m = 2
-(xiii) A radioactive element is placed in an evacuated
-chamber. Then the rate of radioactive decay will
-		(a) Decrease
-		(b) Increase
-		(c) Remain unchanged
-		(d) Depend on the surrounding temperature
-(xiv) The graph given below shows heat energy supplied
-against change in temperature when no energy is
-lost to the surrounding. The slope of this graph will
-give
-
-		(a) Specific heat capacity
-		(b) Latent heat of fusion
-
-		(a) Move away from the slab
-		(b) Move towards the slab
-		(c) Not shift
-		(d) Move towards the left side of the lens
-Question 2
-(i) (a) In the following atoms, which one is a
-radioisotope? Give one use of this isotope.
-			 O16, C14, N14, He4
-		(b) Name the class of the lever shown in the picture
-below:
-[3]
-
-Bottle
-
-(ii) Fill in the blanks:
-[2]
-		(a) When a stone tied to a string is rotated in a
-horizontal plane, the tension in the string
-provides _________ force necessary for circular
-motion.
-		(b) Work done by this force at any instant is
-_________.
-(iii) 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.
-[2]
-
-(iv) Meera chose to use a block and tackle system of ‘9’
-pulleys instead of a single movable pulley to lift a
-heavy load.
-[2]
-		(a) What is the advantage of using a block and
-tackle system over a single movable pulley?
-		(b) Why should she connect more number of
-pulleys in the upper fixed block?
-(v) 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.
-[2]
-
-Solved Paper - 2024
-(vi) 5 bulbs are connected in series in a room. One bulb is
-fused. It is removed and remaining 4 bulbs are again
-connected in series to the same circuit. What will
-be the effect on the following physical quantities?
-(Increases, Decreases, Remain Same)
-		(a) Resistance
-		(b) Intensity of light
-[2]
-(vii) Rohan conducted experiments on echo in different
-media. He observed that a minimum distance of ‘x’
-metres is required for the echo to be heard in oxygen
-and ‘y’ metres 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
-[2]
-Question 3
-(i) (a) In a reading glass what is the position of the
-object with respect to the convex lens used?
-		(b) Why can we not use concave lens for the same
-purpose?
-[2]
-(ii) 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.
-[2]
-(iii) State two factors affecting the speed of rotation of the
-coil in a D.C. motor.
-[2]
-(iv) 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.
-[2]
-(v) Copy and complete the nuclear reaction by filling in
-the blanks.
-[2]
-		 92U235 + 0n1 → 56Ba... + ... Kr92 + 3 0n1
-
-SECTION B - 40 MARKS
-(Attempt any four questions from this Section.)
-Question 4
-(i) 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.
-[3]
-(ii) Below is an incomplete table showing the
-arrangement of electromagnetic spectrum in the
-increasing order of their wavelength. Complete the
-table.
-[3]
-Gamma ray
-
-X-ray
-
-UV
-rays
-
-Visible
-rays
-
-Infrared
-
-A
-
-Radio
-waves
-
-		(a) Identify the radiation A.
-		(b) Name the radiation used to detect fracture in
-bones.
-		(c) Name one property common to both A and Radio
-waves.
-(iii) (a) Why do we use red colour as a danger signal on
-the top of a skyscraper?
-		(b) 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.
-
-3
-
-		 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?
-
-		
-		
-
-
-
-[4]
-
-Question 5
-(i) (a) Refractive index of glass with respect to water is
-9
-.
-8
-			
-
-Find the refractive index of water with respect to
-glass.
-
-		(b) Name the principle used to find the value in part
-(a).
-		(c) If we change the temperature of water, then will
-9
-the ratio
-remain the same? Write Yes or No.[3]
-8
-(ii) 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:
-		(a) ‘Light covers a distance of ‘20x’ units in time ‘t1’
-in diamond. ‘State true or false.
-		(b) Calculate the refractive index of the medium in
-terms of ‘t1’ and ‘t2’. 
-[3]
-(iii) 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.
-N
-45°
-Q
-P
-
-60°
-N'
-
-60°
-
-60°
-
-		(a) Copy the diagram and complete the path of the
-ray PQ.
-		(b) State two factors on which the angle of deviation
-depends. 
-[4]
-Question 6
-(i) (a) Define Centre of Gravity. 
-
-[3]
-
-		(b) A hollow ice cream cone has height 6 cm.
-			
-
-1. Where is the position of its centre of gravity
-from the broad base?
-
-			
-
-2. Will its position change when it is filled
-completely with honey? Write Yes or No.
-
-Oswaal ICSE PHYSICS, Class-X
-
-4
-(ii) 
-
-[3]
-
-(iii) In the given diagram, a vibrating tuning fork is kept
-near the mouth of a burette filled with water. The
-length of the air column is adjusted by opening
-the tap of the burette. At a length of 5 cm of the air
-column, a loud sound is heard. 
-[4]
-
-5
-
-Tuning
-fork
-
-		
-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.
-		(a) Which marble will surely reach the next peak?
-		(b) Along which path/s the mechanical energy will
-be conserved?
-		(c) Along which path/s is the law of conservation of
-energy obeyed? 
-(iii) Given are two pulleys. 
-[4]
-
-		(a) Copy and complete the labelled diagram
-connecting the two pulleys with a tackle to
-obtain Velocity Ratio = 2.
-		(b) If Load = 48 kgf and efficiency is 80% then
-calculate:
-			 1. Mechanical Advantage.
-			 2. Effort needed to lift the load.
-Question 7
-(i) (a) Name the waves used in SONAR. 
-
-[3]
-
-Water
-
-		(a) Name the phenomenon illustrated by the above
-experiment.
-		(b) Why is a loud sound heard at this particular
-length?
-		(c) 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.
-Question 8
-(i) The voltage - current readings of a certain material
-are shown in the table given below: 
-[3]
-Voltage (V)
-
-10 V
-
-20 V
-
-30 V
-
-Current (I)
-
-2A
-
-3A
-
-4A
-
-		
-Study the table.
-		(a) State whether the conductor used is ohmic or
-non-ohmic.
-		(b) Justify your answer.
-		(c) State Ohm’s law.
-(ii) Below is the diagram of a transformer: 
-[3]
-
-		(b)
-			 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.
-(ii) (a) Complete the following radioactive reaction:
-234
-X → Y + 42 He → 91
-Z + –10 e
-			
-		(b) Uranium is available in two forms U-235 and
-U-238. Which of the two isotopes of Uranium is
-more fissionable?
-[3]
-
-		(a) Identify the type of transformer.
-		(b) In this type of transformer which of the wire is
-thicker, the primary or the secondary? Give a
-reason.
-
-Solved Paper - 2024
-(iii) Study the diagram: 
-
-[4]
-
-		(a) Calculate the total resistance of the circuit.
-		(b) Calculate the current drawn from the cell.
-		(c) State whether the current through 10 W resistor
-is greater than, less than or equal to the current
-through the 12 W resistor.
-Question 9
-(i) 85 g of water at 30°C is cooled to 5°C by adding
-certain mass of ice. Find the mass of ice required.[3]
-		
-[Specific heat capacity of water = 4.2 Jg–1°C–1,
-Specific latent heat of fusion = 336 Jg–1]
-[3]
-(ii) (a) Why does it become pleasantly warm when the
-lakes start freezing?
-		(b) Water freezes to form ice. What change would
-you expect in the average kinetic energy of the
-molecules?
-
-5
-
-		(c) Which will contain more heat energy 1 g of ice at
-0°C or 1 g water at 0°C?
-[3]
-(iii) (a) State one factor that affects the magnitude of
-induced current in an AC generator.
-		(b) Given below is a circuit to study the magnetic
-effect of electric current. ABCD is a cardboard
-kept perpendicular to the conductor XY. A
-magnetic compass is placed at the point P of
-the cardboard. P1 and P2 are the positions of the
-magnetic compass, before and after passing a
-current through XY respectively.
-R
-N
-X
-P1
-
-A
-D
-
-			
-			
-			
-
-P
-C
-
-B
-
-D.C.
-Supply
-P2
-
-Y
-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?
-[4]
-
-
-
-6
-
 Oswaal ICSE PHYSICS, Class-X
 
 ANSWERS