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ICSE Class 8 Mid-term 2023 : Physics

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FINAL EXAMINATION 2022-2023 PHYSICS GRADE: 8 TIME: 1 HOURS DATE: 27th February 2023 MAX. MARKS: 80 Instructions: Answer the questions in the answer script provided. The intended marks for questions are given in brackets [ ]. The time given at the head of the paper is the time allowed for writing the answers. You are allowed additional 15 minutes for only reading the Paper. Section A is compulsory and attempt any four questions from section B. ___________________________________________________________________ SECTION - A Question 1. Choose the correct answer. i. ii. iii. The SI unit of heat is a) watt b) joule What does a barometer measure? a) the current in a circuit c) the pressure of air [10X1=10] c) calorie d) Nm b) the density of a liquid d) the temperature of an object Which line in the table shows the relative expansion of the three states of matter, from the most expansion to the least expansion? most expansion least expansion a Solids > Liquids > gases b Solids > gases > liquids c gases > liquids > Solids d gases > Solids > liquids iv. The kinetic energy of a body of mass 5kg moving at 10 m/s is a) 125 J b) 225 J c) 300 J (Page 1 of 8) d) 250 J iv. The picture shows a hammer used by carpenters to drive nails into wood. Which point on the hammer must be gripped in order that the carpenter uses the least force in driving the nail? a) X b) Y c) Z d) cannot say vi. A woman is in contact with the floor as shown below. In which of these poses does she produce the least pressure on the floor? a) b) vii. In which of these cases is work done? c) d) a) A person sleeps b) A boy pushes a locked door that does not move c) A child sits in the chair d) A girl pulls her chair into another room viii. The diagram shows three different containers J, K and L. Each container contains water of the same depth. Which statement about the pressure of the water on the base of each container is correct? J K L a) The water pressure is greatest in container J. b) The water pressure is greatest in container K. c) The water pressure is greatest in container L. d) The water pressure is the same for all three containers. (Page 2 of 8) ix. A loud sound wave is played through the speaker, causing the flame to vibrate. What type of wave is emitted from the speaker, and in which direction does the flame vibrate? a wave type transverse b longitudinal c transverse d longitudinal direction of vibration x. Which amongst the following is correct for a body lifted from the ground? Kinetic energy Potential energy a constant increasing b constant decreasing c decreasing increasing d decreasing decreasing QUESTION2. Fill in the banks. i. ii. iii. iv. v. vi. vii. viii. ix. x. [10X1=10] If an object is lifted to double its height, then the gravitational potential energy ____________. The kinetic energy of molecules in a substance ________ when a substance is heated. In an electric bulb electric energy change into __________. The SI unit of power is________. The process by which a solid change into gas is called___________. ___________ is the shrillness or flatness of a sound. Pressure exerted over a surface ___________ with decrease in area of contact. ____________ is the process in which a liquid change to gaseous state at all temperatures. Moment of force= _____________ X perpendicular distance. The envelope of air that surrounds the earth is called____________. (Page 3 of 8) QUESTION 3. Write one word for the following. i. ii. iii. iv. v. vi. vii. viii. ix. x. [10X1=10] The phase change from gaseous state to a liquid state. Change in length of an object when the object is heated. The process that occurs only on the upper surface of the liquids. Force acting normal to the surface. The degree of hotness or coldness in an object. Pressure exerted by fluids on the container sideways. The state at which there will be no exchange of heat takes place between objects. The energy stored in a rubber band when it is stretched. Maximum displacement of the vibrating particle from the mean position. The product of force and displacement in the direction of force. Question 4. Give reason. [5x2=10] a. b. c. d. Glass breaks or shatters when boiling water is poured into it. Nose starts bleeding as we go on high altitudes. It is easier to open the door by pushing it at its handle. The size of iron rim that is fixed on a wooden wheel is little less than the wooden wheel. e. The work done by a coolie carrying a load on his head for 15 minutes is zero. SECTION-B ANSWER ANY FOUR QUESTIONS Question5. a. A briefcase, with flat, rectangular sides rests on the floor as shown in the diagram(i). Now the briefcase is turned so that it rests with its large, flat side on the floor as shown in diagram(ii). [2] (i) (ii) How has the change affected the force on the floor, and the pressure exerted by the briefcase on the floor? b. Give any two points of difference between energy and power. [2] c. Let A and B having same weight start climbing the rope and reach height of 10 m. If A took 10 s and B took 12 s, compare the work done by them. [1] (Page 4 of 8) d. For a car of weight 9000 N, the recommended tyre pressure is 18 Pa. Find the area of each tyre in contact with the ground. [3] e. Name the sounds of frequency (i) above 20,000 Hz and (ii) below 20 Hz. [2] Question 6. a. A small gap left between two successive rails. Why? [2] b. A whale takes a breath at the surface of the ocean, where the pressure is 100,000 Pa. It then dives to a depth where the pressure is 121,000 Pa. The temperature is the same at this depth as it is at the surface. The whale lets out a bubble of air of volume 50cm3. This bubble rises to the surface of the ocean. Do you think the volume of the bubble increases/decreases/remains same when it reaches the surface? Justify your answer. [2] c. A force of 10 N acts on an area of 0.1 m2. The force is kept the same, but the area is reduced to half. Calculate the pressure exerted by the force with relevant steps. [3] d. State law of conservation of energy. [2] e. Define one joule. [1] Question 7. a. Siraj kept a jam bottle made of glass inside a refrigerator. After few days when he tried to open, the cap fits very tightly and was difficult to remove. Suggest him a way that he can open it easily and explain. [2] b. At which position does the child on the swing have (i) the most gravitational potential energy and (ii) the most kinetic energy? [2] c. Give two factors on which volume expansion of a substance depends. (Page 5 of 8) [2] d. Define condensation and give an example. [2] e. The pressure at the bottom of a glass filled with water is P. The water is taken out and the glass is filled with kerosene oil, (density = 817.5 kg/m3). Will the pressure at the bottom be i. Greater than P ii. same as P iii. smaller than P. Justify your answer. [2] QUESTION 8. a. When a ball is thrown into air,(i) ________ energy decreases as it is moving up and (ii) ________________ energy increases. But at any point of its journey (iii) ____________ energy remains constant. [3] b. A uniform bar is pivoted at its centre. What force F is needed to balance the bar? [2] c. Two bodies P and Q of equal masses are kept at heights of h and 2h, respectively. What will be the ratio of their potential energies? [2] d. (i) Identify the letters A, B, C and D in the waveform shown below. [2] (ii) what happens to the pitch of the wave if the distance C is decreased? [1] Question 9. a. How fast should a man of mass 50kg run so that his kinetic energy be 625J? [2] b. Name the type of energy possessed in the following cases: [2] (i) A flying bird (ii) A compressed spring c. Define solidification and give an example. (Page 6 of 8) [2] d. A ruler is placed on a pivot; three forces act on it, as shown. (i) Which among the three forces has no moment of the pivot? [1] (ii) Calculate the moments of the other two forces about the pivot. [2] (iii) Will the ruler be turning? Explain. [1] Question 10. a. A cyclist travels down a hill from rest at point X, without pedaling. The cyclist applies his brakes, and the cycle stops at point Y. Which energy changes have taken place between X and Y? [2] b. A heavy chair had been placed on a carpet for a long time. When it was removed, big holes were observed under the four legs on the carpet. Give a suitable reason for these holes. [2] c. As you climb up a mountain, the ears pop due to changes in atmospheric. pressure. In which direction, outward or inward, does your eardrum move when you climb up? Explain your answer. [2] (Page 7 of 8) d. Name the type of energy possessed by the load of mass 5kg hanging as shown in the figure below and calculate it. [3] e. The work done to lift an object of mass 2 kg on earth is 80 J. Does the work done increase/decrease/remains same if the same object has been lifted to same height on moon? [1] (Page 8 of 8)

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