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ICSE Class IX Board Exam 2021 : Physics

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Anil Kumar Dash
Saint Lawrence School (SLS), Tentoloi, Balaramprasad, Angul
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Date-26.02.2021 SAINT LAWRENCE SCHOOL ANNUAL EXAM., 2020-2021 CLASS 9, PHYSICS TIME-2 hours F.M.-80 SECTION A(Answer all questions) Q.1.a) Write the S.I. unit of the following physical quantities: Temperature, Electric charge, Solid angle, Luminous intensity. b) What is a Seconds pendulum? Calculate its frequency of oscillation. c) What is instantaneous speed? Suggest a device that measures this speed. d) State the Newton s law of motion that: (i) gives the qualitative definition of force, (ii) specifies a property of force. e) A body of mass 500 g is resting on a frictionless table. Calculate the acceleration produced in the body when acted upon by a force of 0.01 N. [2] [2] [2] [2] [2] Q.2.a) Calculate the height of a water column which will exert on its base the same pressure as the 70 cm column of mercury. [Take Density of mercury = 13600 kg m-3 and Density of water = 1000 kg m-3.] [2] b) What is buoyant force? Compare the buoyant force experienced by a body, completely immersed in water, when it is present at a depth of 10 cm and 20 cm from the free surface of water. [2] c) State the principle of floatation and name two devices based on this principle. [2] d) A body floats just below the surface of a liquid. What will be your observation, if the liquid is heated (below its boiling point)? Explain your answer. [2] e) What do you mean by anomalous expansion of water? [1] State its important role in nature (explanation not required). [1] Q.3.a) Draw a ray diagram to show the formation of image of a point object by a plane mirror. [2] b) Give two differences between concave mirror and convex mirror. [2] c) A parallel beam of light incident parallel to the principal axis of a spherical mirror, after reflection, it converges to a point on the principal axis which is situated at a distance of 7.5 cm from its pole. Name : (i) this point and (ii) its distance from the pole. Also find the radius of curvature of the mirror. [2] d) Calculate the speed of sound in dry and still air at 25 oC. [2] e) What do you mean by Ultrasound? Give its two applications. [2] Q.4.a) Define: (i) Electric current, (ii) Electric Potential. [2] b) State Ohm s law. [1] c) State and define the S.I. unit of : (i) Electric current, (ii) Resistance. [3] d) In transferring 1.5 C charge through a metallic wire 9 J of work is needed. Find the potential difference across the ends of the wire. [2] e) What special feature does a magnetic substance have that makes it a temporary magnet on coming in contact with a permanent magnet? [1] f) State two factors on which the strength of the induced magnetism depends. [1] SECTION B (Answer any four questions) Q.5.a) Express the following derived units in M.K.S. system: (i)newton, (ii) joule, (iii) pascal. b) What will happen to a pendulum clock if it is taken to the moon? Explain your answer. c) A body when projected up goes to a height h and returns back to the point of projection in time t. Find: (i) its average speed and (ii) average velocity. d) A cricket ball of mass 100 g moving at a speed of 30 ms -1 is brought to rest by a player in 0.03 s. Find the resistive force applied by the player. Q.6.a) Write two differences between Speed and velocity. b) Give two examples each of : (i) contact forces, (ii) non-contact forces. c) Define the S.I. unit of force and derive its relationship with the C.G.S. unit of force. [3] [2] [2] [3] [2] [2] [3] d) A space craft flying in a straight course with velocity 75 kms -1 fires its rocket motors for 6.0 s. At the end of this time its speed is 120 kms-1 in the same direction. Find: (i) the average acceleration of the space craft while the motors were firing, (ii) the distance traveled by the space craft in the first 10 s after the rocket motors were started, the motors having been in action for only 6.0 s. [3] Q.7.a) A ball is thrown vertically upwards with an initial velocity of 49 ms -1. Calculate the maximum height attained. [ Take g = 9.8 m s -2.] b) Define momentum and state Newton s 2nd law in terms of momentum. c) State the action and the reaction in the following cases:- (i) A person swims in river water, (ii) a bullet is fired from a gun. d) Calculate the gravitational force of attraction between two bodies of masses 40 kg and 80 kg separated by a distance of 20 m. [Take G = 6.7 x 10-11N m2 kg-2.] e) Write two differences between Mass and Weight. [2] [2] [2] [2] [2] Q.8.a) State and define the law on which the working of a hydraulic machine is based. [2] b) The area of cross section of press plunger of a hydraulic press is 4 m2. It is required to overcome a load of 400 kgf on it. Calculate the force required on the pump plunger, if the area of cross section of the pump plunger is 0.01 m2. [2] c) What do the following indicate in a barometer regarding weather? : (i) gradual fall in pressure, (ii) sudden fall in pressure, (iii) gradual rise in pressure, (iv) sudden rise in pressure. [2] d) Why can not one suck in soft drink using straw on the surface of moon? [1] e) What is an Altimeter? [1] f) Define Buoyant force and state its effect. [2] Q.9.a) State Archimedes principle. Give one example to show that it is applicable to gases also. [2] b) Apiece of brass weighs 175 gf in air and 150 gf when completely immersed in water. Find: (i) the upthrust on the body, and (ii) the volume of the body. [Density of water = 1.0 g cm-3] [2] c) A goldsmith claims that gold ornaments made by him are fully pure (having relative density 19.3). He sells a gold article to a customer that weighs 34.75 g. In order to find the purity of the gold article, the clever customer weighs the article by completely immersing it in water and finds that it weighs 31.89 g. Then he determines that the article is not pure. By doing necessary calculations, find how did the customer reach to the conclusion that the ornament was not pure? [3] d) Name the two forces that act on a body when it is immersed in a liquid. State, how do these forces help us to determine whether a body will sink or float? [3] Q.10.a) State the two laws of reflection. [1] b) Draw a neat ray diagram to show the formation of image of an object kept in between two plain mirrors arranged parallel to each other. [2] c) A boy uses a spherical mirror and a lighted bulb to obtain a bright patch of light focused on a screen. Draw a ray diagram to show, how does he arrange the bulb and the mirror to achieve this? [2] d) Name the mirror in each of the following:[2] (i) that always forms a virtual and erect image, (ii) that is used as a reflector in room heater, (iii) that is used as a shaving mirror, (iv) that is used as a reflector in street lights. e) A sound of wavelength 68 cm travels 850 m in 2.5 s. Calculate: (i) the velocity of sound, (ii) the frequency of sound. Also state, with the reason, whether this sound will be audible to us or not? [3] Q.11.a) Name the two different kinds of cells and give one differences between them. [2] b) State the function of the following electrical devices: [3] (i) Ammeter, (ii) Voltmeter, (iii) Rheostat. c) Draw a circuit diagram to show the connection of a bulb with a cell, a key, and the devices mentioned in (i), (ii), (iii) of question 10(b). [3] d) You are provided with two iron bars. How can you find which one is a magnet? [2]

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