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ICSE Class X Mid-term 2025 : Physics

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Swapan Sengupta
Delhi Public School (DPS) Megacity, Kolkata

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St. Stephen's roup of Schools Terminal Examination 2024-25 Class-X PHYSICS (SCIENCE PAPER 1) Maximum Marks: 80 Time allowed: Two hours (The time given is the time allowed for writing the answers.) B.The intended SectionA is compulsory. Attempt any four guestions from Section marks for questions or parts of questions are given in brackets| SECTIONA (40 Marks) (Attempt all questions from this Section) [15] Question1 Choose the correct answers to the questions from the given options. x from its vertex, the value of x is 0Centre of gravity of a hollow cone of height h is at distance (a)h/4 (b)h/3 (d)2h/3 (c)3h/4 ratio 3:2.Their kinetic energies will be in the (Two bodies having equal momentum have velocities in the ratio FFL (a)2:3 (b)4:9 (c)3:2 (d)9:4 (iii)The velocity ratio of an ideal single movable pulley is (a) 1 (b)2 (c)less than 2 (d)less than 1 (iv)Select the incorrect option: the fulcrum and load. (a)Class Il levers have effort between than 1 or equal to 1. (b)Class I levers can have M.A. greater then 1, less multiplier. (c)A machine can be used as a speed the velocity ratio. (d)A machine cannot have the M.A. greater than (v) n object in a denser medium when viewed trom a rarer medium appears to be raised The chifi maximum for (a)blue light (b)red light (c)yellow light (d)green light (vi)A total reflecting equilateral prism can be used to deviate a ray of light through (a)300 (b)60 (c)120" (d)90" ELE (vii)The image of an object placed at The focal length of the lens is (a)20 cmn a (b)10 cm distance of 30 cm rom a convex lens is forned 30 cm behind (c)15 cm (d)7.5 cm (vii)A light wave has wavelength of 100 nm.The wave is (a)gamma ray (b)X-ray (c)infrared ray (d)ultraviolet ray (ix)A student finds difficulty in reading from the black board. Which lens will he (a)convex lens (b)concave lens (cleither of above (d)neither of above. (x)When a white light ray falls on a prism then (a)deviation occurs at the first use for correcting his vision surface of prism. (b)the prism produces seven colours of spectrum. (c)dispersion occurs at the first surface (d)scattering of light occurs in the prism. of prism. (xi)When a body vibrates under a periodic force, the vibrations of the body are always (a)free vibrations (b)damped vibrations (c)forced vibrations (d)resonant vibrations (xii)A man playing a flute produces notes of different frequencies. If he of the note closes the holes near his mouth, pitch (a)increases (b)decreases (c) remains same (d) cannot be ascertained (xiii)A wire of resistance Ris stretched to n times, its new resistance is (a)n'R (b)n /R (c)nR (d) none of these xiv)Which of the following combinations have the same equivalent resistance? (a) (b) (c) D(a) &(c) (b)(a) &(d) (c) (a).(c) &(d) (d) (d) all of the above - he dhagram shows a three-pin socketn marked as 1.283.To which Anected? wire joinedto the fuse 2 or 3,is 2 (a)1 (b)2 (c)3 (d)2 or 3 Question 2 WajName the unit of physical quantity obtained by the formula . where P:power t:time,F:force. (b)State the energy changes that occur in a car going uphill. (C) Abody of mass m, initially at rest, acquires avelocity ofv when a force of Facts on it .Find the amount of ( work done by the force. [3] (1)A machine of efficiency 62.5% has M.A. equal to 10.What is its V.R.? [2] (i) Name the objective property of light related to colour.Which colour of light has smaller critical angle? Green light or Blue light. [2] (iv)State a condition when a ray of light can pass undeviated through a lens. What will be the power of the combination if two lenses of power +2 Dand -2D are placed in contact? [2] (v)Define scattering of light. Abeam of red, yellow and blue light passes through the earth's atmosphere. Which colour of light is scattered the nmost? [2] (vi)A tuning fork produces a pure note. Draw a graph to represent the sound waves emitted bv it. What change occurs in the wave if the tuning fork is struck harder against the rubber pad? (vii)Why is the top pin of a three pin plug made longer? [2] [2] Question 3 (i) In the figure below, the ammeter reads ZA and the voltmeter reads 6v.Find R. Name the law that can be verified using the circuit shown. A w R circular the path. Name in (i)ln an atom, an electron moves around the nucleus consisting a couple? centripetal force. What is the algebraic sum of forces (i)Figure (a) and (b) below, show the refracted Itray BC force Complete through two lenses. which providesthe [2) the diagram by drawi |2] each corresponding incident ray AB. (a) Convex (b) Concave ways by which it can be made to emit a nott (yA Stretched string emits a note of frequencv 256 Hz. State two [2] of 280 Hz. (v)Name the safety device that is used in house wiring system to save (a) an appliance from damage due to overloading or short circuit. [2 (b) a person from electric shock. SECTION B (40 Marks) (Attempt any four questions from this Section) Question 4 (i)Calculate the value of weight W to balance the rod shown in the diagram below. 0.4m [3] 0.2m SN (i)Drawa diagram to show a block and tackle pulley system having velocity ratio of 3marking the direction of load (L).effort(E)and tension(T).If the pulley system has mechanical advantage of 2.5 and lifts a load of 1co kgf, calculate the effort required to lift the load. (3 (iii)Anendulum swings between Aand Bas shown below. What kind of energy does the bob possess (a) at A (b) at D? If the bob has total energy 0.16 | and mass 0.10 kg, find the velocity at C. 14] B Ouestion 5 Uinedlagram below shows the path of a rav of licht throuoh one corner af a cube of ice. retraction at the face AB. (b)the critical Find (a) the angie O angle for ice. |3| A 20 131 ice air W}what is the wavelength of visible Spectrum2 Which ofthe following lenses would you prefer to use while reading small letters found in a dictionary? taja convex lens of tocal length 5 cm (b)a concave Jens of focal length 5 cm (c) a convex lens of focal length 50 cm. Give reason to your answer. [3) (n)An object of height 4 cm is placed at a distance 24 cm in front of a convex lens of focal length 8 cm. Find (a) the position of image (b) the size and nature of image. 14] Question 6 (OName the phenomenon/property responsible for the following observation: [3] (a)a crack in a glass vessel often shines like a mirror. (b)the sky appears black to an astronaut in a space-ship. (c)stars appear twinkling in the sky. (iilWater in a swimming pool appears to be 1.5 m deep when seen from above. Is it safe for a 160 cn tall person to jump in if he does not know swimming? (refractive index of water =4/3) (iii)A magnified image is to be (3] projected on a sCreen. What type of lens should be used? Draw a rav diagram showing the formation of image. State other characteristics of the imape [4] Question (JThree pendulums A, Band Care hung from the same string MN JfA is set to oscillate B ano diso Oscill [3) (a) Name the type of oscillation Aand B will execute. (b)Why does C resonate with larger amplitude? ()Ihe figure below shows three sound waves A Rand C Name which two waves have (a)same pitch(b)same quality. Compare the wavelengths of Band C. [3) (iii)A man is standing between two cliffs, separated by a distance of 850m from each other. He fires a gun and hears first echo after 1.5 sec and second echo after 3.5 sec. Find (a)his distances from two cliffs(b)velocity of sound. [4] Question8 ()Name two factors on which the specific resistance of a wire depends. Namea material which is used for making the standard resistor. [31 (i)The figure below shows two bulbs connected to the through a three pin socket by means of athree wires cable. Name and state the colour insulation of eachmains wire 1,2 and3. What is the electric potential of 1 2 and 3? [3] oObserve the circuit diagram below and resistance (c) current calculate (a)resistance of circuit through S2 resistor. c (b)current through 20 |4 t6V T=2n Question 9 3Tne ngure below shows a wheel barrow weighing 10 kofcarrving 50 kgf sand with its A. IT horizontal distance AB-50 centre of gravity at cm and AC=100 cn.find(almechanical advantage (b)the minimum required to keep the leg just off the eftort ground. (i) Choose the correct word and complete the sentence: (a)Lenses made of material of higher refractive index have longer/shorter focal lengths. (b)A thicker lens has higher/lower power. (3 (c)A lens can/cannot produce a virtual image of the same size as the object. (i )(a)Name the commercial unit of electrical energy consumed in houses. Give its value in S.L unit (b)A 60 W and a100 W lamp are connected in series.The combination is connected to a 240 V source Which of the two lamps will gloww more brightly? Give reason. |4)

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