physics sem 1 paper 2023-24 Jani's academy.pdf

Children's Academy Group of Schools Ashok Nagar, Kandivli (E) OThakur Complex, Kandivi () Bachanl Nagar, Malad (E)...

Children's Academy Group of Schools Ashok Nagar, Kandivli (E) OThakur Complex, Kandivi () Bachanl Nagar, Malad (E) 2023-24 AOot SECOND SEMICSTER EXAMINATION PHYSICS Marks : 80 Grade : IX Subject : Time : 2 hours Date : 20/02/2024 Jou will not he ullowed to write dwing the first 15 minutes. This time is to be spent reuling the question paper. allowed for writing answers. 7he tine givvn at tlhe head of this paper is the time This puper consists of8 printed pages. four questions from Section B. Atempt ull questions from Section A nd any questivns ure given in brackets //. The intended marks fur questions or parts of Section A (40 Marks) (Attempt all questions from this section) Question 1 options. Choose the correct answers to the questions from the given answers only.) (Do not copy the question, write the correct to another. Make a () Suppose the object travel from one point in space comparison between the distance and displacement travelled. (a) The displacement is either greater than or equal to the distance travelled. (b) The displacement is always equal to the distance travelled. (c) The displacement is either greater than, less than or equal to the distance travelled. The displacement is either less than or equal to the distance travelled. (d) (i) In the given figure, velocity of the body at A is: (a Zero (b) Maximunm (c) Negative (d) One (1) Agoalkeeper in a game of football pulls his hands +Thme B backwards along with the ball shot on the goal. (iv) An apple falls from a tree because of the force of gravitybetween the carth and the applc. IfFI is the magnitude of the force exerted by the carth on the apple and F2 is the magnitude of force exerted by the apple on the carth, then (a) FI is very much greater than F2 (b) F2 is very much greater than Fl (c) FI is only a little greater than F2 (d) Fland F2 are exactly equal (v) From the provided velocity-lime graph depicting the body's motion, what is the acccleration of the body between t2-13? () E (a) ;(EB + EC) XBC (b) EC (c) EB (d) -(EB+ EC) XBC (vi) Assertion: A submarinc expcriences a change in pressure as it descends to grcater depths in the ocean. Reason: The change in pressure is due to the increasing weight of the water column above the submarine. (t Both the assertion and reason are true, and the reason is the correct explanation of the assertion. Both the assertion and rcason are true, but the reason is not the correct (b) Cxplanation of the assertion. (c) The assertion is true, but the reason is false. Both the assertion and reason are false. (d Etnlu (vi) What law/principle is illustrated by the diagran1 alognside? (a Newton's law. (b) Archimedes Principle. (c) Pascal's law. (d) Principle of floatation. (viii) The relative density of a solid is 0.6. It floats in water with: (a) 6% of its volume outside the water. (b) 6% of its volume inside the watcr. (C) 60% of its volume inside the watcr.  container of liquid as shown in the figure. Identify the string attached to which object will be under maximum tension. (a) A (b) B (c) C (d) D (X Under which of the following condition a concave mirror can form a virtual and larger image than the actual object? (a) When the object is kept at a distance equal to its radius of curvature. (b) When the object is kept at a distance less than its focal length. (c) When the object is placed between the focus and centre of curvature. (d) When the object is kept at a distance greater than its radius of curvature. (xi) The direction of the ray of light incident on the concave mirror is shown by PQ while the direction in which the 2 ray would travel after reflection is shown by four rays marked 1, 2, 3 and 4. Which of the four rays correctly 3 represents the direction of the reflected ray. (a) (b) 2 (c) 3 (d) 4 (xii) Which of the following statements are correct? (1) Sound is produced by vibrations. (2) Sound requires a medium for propagation. (3) Light and sound both require a medium for propagation. (4) Sound travels slower than light. () 1 &2 only (b) 1,2 &3 only (c) 2,3 &4only 1,2 & 4 only (xii) Which of the following sound will be audible to the humans. (a) 5000 mHz (b) 30 kHz (c) 0.01 MHz (d) 50000 uHz (xiv) Identify the circuit in which the electrical components have been properly connected. Question 2 () () Iistlwo properties of 'ultraonIC MUnd' that make it uscful t) u (b) lhe speed of a sound in a medium, the clasticity of mediun asd the lensity thc medium are represcnted by 'V, Band 'p'respectivcly. Give anathematical rclation between V,'B'and 'p'. (ii) You are given a key, a rheostat, an ammcter, a voltmcter, battery and a load with some conccting wires. Draw a circuitdiagram that verifies Ohm's lavw. [2) (i) How arc u and v related if: (a) The image formed by a convex mirror is of size half of thc object? (b) The magnification for a mirror is -2. (iv) A solid weighs 80 g in air and 64 g in water. Calculate the relative density of solid. [2) (v) Fillinthc blanks: (a) Tbar = cm of Hg (b) Iatm torr (vi) Mention action and reaction forccs the following cases: (a) (b) Rowing Cannon of boat Ball (vii) Give one context or situation of cach of the following cases to occur? (a) Abody moving with uniform velocity but variable specd. (b) The avcrage spced of the body is the same as the average velocity. Question 3 (01) Thrce velocity-time graphs are shown in the figure. Which graph represents the following situations? (a) A ball is thrown vertically upwards and returncd to the hand of thrower? (b) A body is retarding to a constant speed and then accelerating. [2 (iv) Define the terms marked as 'R' and P' in the alongside diagram. [2) (v) State the change in the resistance of a wire if its radius is doubled. Section B (40 Marks) (Attempt any four questions from this section) Question 4 () Av (a) Write the condition needed for the relation F =m At = ma to hold true. State the law showcased by the athlete while landing in the sand pit after (b) long jump. Plot a sketch to show variation of acceleration with the mass of the bodv (c) when force applied on it is kept constant. (ii) (a) Two friends are having a conversation. Anna says, "A satellite in orbit is in frec-fall because the satellite keeps falling toward Earth." Tom says, "A satellite in orbit is not in free-fall because the acceleration duc to gravity is not 9.8 ns" Who do you aree with and why? (b) In the given diagram illustrating various (ii) Given figure shows a velocity-time graph for point two cars A and B starting from the same following: in the same direction. Calculate the A between 0 s- 8 s (a) Acceleration of car (b) Acceleration of car B between 2s - 4s have (C) At what time intervals, both cars same velocity? Which car is ahead after 8 s? [4) (d) Question 5 (1) Copy and complete the following table: Weather Forecasting Change in Barometric height Cyclone Gradual increase in the barometric height Gradual fall in the barometric height A piece of metal of density 6.5 x 10 kg mand volume 120 cm' is completely (ü) immersed in water. Calculate: (a) the weight of metal piece in air, (b the upthrust of water, (C) apparent weight of metal in water. (Pvater 1000 kg m,g=10 ms). (3] of density (ii) Figure shows a beaker with four holes 1, 2, 3 and 4 containing liquid the acceleration due p up to height 'h', if Po is atmospheric pressure and 'g' is gravity. Answer the following questions: (a) What is the pressure on the free surface of the liquid? What is the pressure on the base of the beaker? (b) (c) What is the lateral pressure at the base on the inner walls of the beaker?  An obedn placedbetween two planc ! aall toc h othe as own nthe fiyure. Cup nlcompleethe ay lagum to ct thrcc innapes (3] () A nm stanlny in Iront of a Dinor, finds his imapc having a very small head, a lat bodly and leps of nomal size. What typc of mirrors are used in these three puts? (3) () thc truck 1S TIic radus of urvalurC of he rcar viCw Convex mirror of Calculate thc distance 6 m. I|ihe car is 8 m fronn the mirror of the truck. at which the inagc is formcd. (b) Draw the rellection of tlie provided Iigure as it appcars ) plane mirror. (4] Question7 () Deline the conponents labelled as P, Q, and R in the displacement-distance graph d the displacemwnt-time graph of asound wave, as depicted in the providel figure. P anplitude DeSination Pehind RIme peo0d (31 () The speed of sound in a is 320 s n in waler is 1600ms. I takes 2.5 s lorsound lo rcach a centain dislanee lronn the source placed in air. Question-1 i’P- Armplitude -wher a oave pasSes thaough a medium, the naximum displacement ot the pasticie f th e medium on eithes side o ts mean posibion, is called amplitcdee of a wave ’Q-ave lenath - The distance toavelled by the wave in one time pesiod o vibation ot the pastice of the medium is called its \0ave lerath. R- Time pesiod- he 4ime taken by a pasticle 0f a nedium complete its one. vboalion to is called the time peoiod ij Speed of souni 320 ms Speed of Sound(uoates) \600 ms ta253 ajoistance tsavelled = d- Vyairs )xt - 320 x 25 d= 60Om b)How much time ll it take fos sOund to geach the same dist. hen the SOUBce 1s in wates? ’ In uoates, V= \600'd -ROO 2 t05S Compase the time talken in ais etand wates t(ais)- t(uales) 325 - 0 5 = 2-05, aM) Name the followings: (a) The innovative technology the marinc scientists employ to detect underwater objects, measure distances. and ensure the safety of their expedition during their deep-sea exploration SoNAK (b) Aspecialized technique used by the medical professionals to visualze and Echo assess the heart's function through sound waves. (asqiogTap hy (c) The specific sound-related technique utilized by healthcare professionals to thoroughly investigate and assess the condition of the kidneys. ultsasod (d) The extraordinary aircraft that pushes the boundarics of conventional speed limits that is designed to travel at speeds greater than the speed of sound, revolutionizing air travel? (on cod jet p\ane [41 Question 8 and Fiante planes (i) (a) Which of thesc devices is most efficient for lighting purpose: LED, CFL, Fluorescent tube light, Electric bulb. (b) Identify the component in an electric circuit represented by the given symbol, and explain why this particular component does not have positive or negative terminals marked? is 60 V (ii) The potential difference between the terminals of an electric heater the heater when it draws a current of 4 A from the source. What current will draw if the potential difference is increased to 120 V? (3] (iii) (a) There is a positively charge sphere A and negatively charge sphere B, such that they are brought in electrical contact by a copper wire. Answer the following questions: (1) Which sphere is considered to have higher potential? (2) Which sphere is considered to have lower potential? (b) Given alongside is a circuit diagram where certain components are connected. Obtect P Sutch When the switch in the circuit is