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PRELIMINARY EXAMINATION 2019-20 Grade: X Subject: PHYSICS Date: 04/12/2019 Marks: 80 Time: 2 hours You will not be allowed to write during the first 15 minutes. This time is to be spent in reading the question paper. The time given at the head of this paper is the time allowed for writing the answers. This paper consists of 7 printed pages Attempt all questions from Section I and any four questions from Section II The intended marks for questions or parts of questions are given in brackets [ ] Section I (40 Marks) Attempt all questions from this section Question 1 (a) Define moment of couple. Write its S.I unit. [2] (b) State any two difference between work and power. [2] (c) A pair of scissors is used to cut a piece of a cloth by keeping it at a [2] distance 8.0 cm from its rivet and applying an effort of 10 kgf by fingers at a distance 2.0 cm from the rivet. Find: (i) the mechanical advantage of scissors (ii) the load offered by the cloth. (d) In which conditions will the light ray moving from liquid to glass passes straight without bending? Will the glass be visible then? [2] (e) Complete following sentence: If half part of a convex lens is covered the focal length ___________ and intensity of the image________. [2] Question 2 (a) (i) What will be the change in specific resistance of the wire if it is stretched to double of its original length? (ii) Name the S.I unit of specific resistance. [2] (b) Arrange the following as per the sequence they are connected in live wire: ELCB, kWh meter, MCB, 50 A fuse. [2] (c) (i) Which type of electromagnet is commonly used in relay? (ii) Why d.c source is preferable to magnetise the electromagnets? Physics/Grade X/ICSE/Preliminary Examination/ Page 1 of 7 [2] CAT/LD/2019-20 (d) An electric heater of power 1000 W raises the temperature of 5 kg of a liquid from 25oC to 31oC in 2 minutes. Calculate the specific heat capacity of the liquid. [2] (e) Which of the following emissions are simultaneously possible: (i) , and (ii) and (iii) and (iv) and [2] Question 3 (a) (i) State the difference between the uniform circular motion and uniform linear motion. (ii)The given diagram represents the forces acting on a body in a circular motion. A and B represents two forces which among them is fictitious force? [2] (b) A simple pendulum while oscillating rises to a maximum vertical height 5cm from its rest position when it reaches to its extreme position on one side. If mass of the bob of the simple pendulum of 500g (g= 10 ms-2), find (i) Total energy of the simple pendulum at any instant while oscillating. (ii) Velocity of the bob at its mean position. [2] (c) Select the correct statement/statements: (i) The velocity ratio of a single fixed pulley is always more than 1. (ii) The velocity ratio of a single movable pulley is always equal to 2. (iii)The velocity ratio of a block and tackle system is always equal to the number of strands of the tackle supporting the load. (iv) A single movable pulley is a speed gainer. (v) A single fix pulley is a force multiplier. [2] (d) Draw a curve showing the variation in the angle of deviation with the angle of incidence at the surface of prism. [2] (e) (i) State the difference between the virtual images formed by convex lens and concave lens. (ii) Can a concave lens form an image of size half of the object? Physics/Grade X/ICSE/Preliminary Examination/ Page 2 of 7 [2] CAT/LD/2019-20 Question 4 (a) Define commercial unit of electrical energy. State how it is related to S.I unit of electrical energy. [2] (b) (i) Which combination of pins should be used in an appliance with two pin plugs. (ii) Explain the meaning of statement the current rating of a fuse is 6 A . [2] (c) (i) State the rule used to determine the force experienced by current carrying conductor kept perpendicular in external magnetic field. [2] (ii) What will be the effect of inserting soft iron core within the coil of d.c motor? (d) Select the correct statement/statements: (i) Pure water can boil at 80oC under high pressure. (ii) Impure water can boil at 120oC under high pressure. (iii) Pure water can boil at 80oC under low pressure. (iv) Impure water can boil at 80oC under high pressure. [2] (e) (i) In nuclear fission which subatomic particle is used to bombard the nucleus. (ii) State whether the given statement is true or false and rewrite the correct statement if it false: All the nuclear reactions can be controlled. [2] Section II (40 Marks) Attempt any four questions from this section Question 5 (a) (i) Observe the given image and state at which point will it be difficult to open the door. Justify (ii) Give an example of body having centre of gravity situated outside its material. [3] (b) (i) What are different forms of kinetic energy. (ii) Is it possible for a body to have a more than form of kinetic energy simultaneously? Justify with an example. Physics/Grade X/ICSE/Preliminary Examination/ Page 3 of 7 [3] CAT/LD/2019-20 (c) (i) A block and tackle system has velocity ratio 2. Draw neat and labelled diagram of the system indicating the points of application and the direction of load and effort. (ii) State any two reasons why the above system cannot have a MA=2 in actual practice. [4] Question 6 (a) A fish is looking at a 1.0 m high plant at the edge of the pond. Will the plant appear shorter or taller than its actual height? Draw a ray diagram to support your answer. [3] (b)(i) What do you mean by power of lens. (ii) Name the S.I unit of power of lens. (iii) Which has more power, thick or thin lens. [3] (c) A lens forms an image 16 cm long of an object 4 cm long kept at a distance 6 cm from the lens. The object and the image are on the same side of lens. (i) Name the type of lens. (ii) What is the nature of image? (iii) What will be the position of image? (iv) Determine the focal length of lens. [4] Question 7 (a) Find the equivalent resistance between A and B in the given circuit. [3] (b) The diagram shows three pin socket marked 1, 2 and 3. (i) Identify and name the holes 1, 2 and 3. (ii) Is it recommended to have all the holes in the socket of same diameter? Justify your answer. [3] (c) (i) Draw neat and labelled diagram of d.c motor. (ii) State the function of split ring commutator. Physics/Grade X/ICSE/Preliminary Examination/ Page 4 of 7 [4] CAT/LD/2019-20 Question 8 (a) Specific heat capacity of substance X is 240 J kg-1 K-1 whereas the Specific heat capacity of substance Y is 2.4 J g-1 K-1. If substances X and Y are liquids then (i) Which one would be more useful in car radiators and why (ii) Identify the better conductor in X and Y. [3] (b) A piece of iron of mass 0.1 kg is kept inside a furnace for a long time and then put in a calorimeter of mass 10 g containing 240 g of water at 20 C. The mixture attains an equilibrium temperature of 60 C. Find the temperature of the iron piece. Specific heat capacity of iron = 470 J kg 1 C 1. [3] (c) (i) In which case the specific latent heat of freezing is different from specific latent heat of fusion? (ii) Which has more heat content, 1 g of water at 0oC 1 or g of ice at 0oC? (iii) What is the difference in heat energy possessed by 1 g of water and 1 g of ice at 0oC? (iv) Which form of energy increases on supplying heat energy during change of phase. [4] Question 9 (a) (i) What are the two properties of metals used to stop particles for the production of X-rays. (ii) How is particles different from cathode rays? [3] (b) Write any three advantages of using nuclear fusion over nuclear fission for yielding electricity. [3] (c) (i) In a radioactive decay of nucleus , mass number of parent nucleus reduces by 4 and number of neutrons reduces by 3. Calculate the number of and particles emitted in the process. Physics/Grade X/ICSE/Preliminary Examination/ Page 5 of 7 CAT/LD/2019-20 (ii)Fig. shows a radioactive source S in a thick lead walled container having a narrow opening. The radiations pass through an electric field between the plates A and B. Complete the diagram to show the paths of , and radiations. [4] Question 10 (a) (i) The given diagram represents the centre of gravity (G) of two cars A and B. Which of the two cars is more likely to get toppled? (ii) What does the position of centre of gravity of the body depends upon? (iii) A uniform flat circular rim is balanced on a sharp vertical nail by supporting it at point A, as shown in figure. Which position in 1, 2, 3 and 4 is most likely to be a centre of gravity of the rim. Physics/Grade X/ICSE/Preliminary Examination/ Page 6 of 7 [3] CAT/LD/2019-20 (b) (i) A light ray passes from denser medium to rarer medium at an angle of incidence i corresponding to which angle of refraction is 90o, what is angle i called ? (ii) In the given figure, a ray of light PQ is incident normally on side BC of the triangle CAB. Complete the path of ray PQ till it emerges out of prism. Mark in the diagram the angle wherever necessary. [3] (c) On a winter day the temperature of the tap water is 20 C whereas the room temperature is 5 C. Water is stored in a tank of capacity 0.5 m3 for household use. If it were possible to use the heat liberated by the water to lift a 10 kg mass vertically, how high can it be lifted as the water comes to the room temperature? Take g = 10 m s 2 , density of water= 103 kg m-3. 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