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ICSE Class X Prelims 2023 : Physics (GEMS Modern Academy, Dubai) Mock

7 pages, 66 questions, 63 questions with responses, 63 total responses,

Ranjit Menon
GEMS Modern Academy, Dubai

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MOCK Examination 2023 PHYSICS Grade: X Marks: 80 Date: 13/2/2023 Time: 2 hr -----------------------------------------------------------------------------------------------------------Instructions This paper consists of two sections. Section A is compulsory, and from Section B, you have to write any FOUR questions out of six. No calculators should be used for calculation. Fifteen minutes will be provided as reading time. Kindly refrain from writing anything during this time. Do not do any rough work on the question paper. This paper consists of 8 printed pages. Two hours will be provided for writing this paper Write only the correct options(alphabet) for multiple-choice questions. ---------------------------------------------------------------------------------------------------------SECTION A (All questions are Compulsory) Question 1 i)SONAR works on the principle of a) refraction of sound b) echo c) reflection of sound d) None of the above ii )A cyclist travels down a hill from rest at point X, without pedalling. The cyclist applies his brakes and the cycle stops at point Y 1 a) kinetic thermal (heat) gravitational potential . iii) Which energy changes have taken place between X and Y? a) gravitational potential kinetic thermal (heat) b) gravitational potential thermal (heat) kinetic c) gravitational potential thermal (heat) iv)Which movement will require the greatest amount of work to be done? a) A force of 10N moving an object a distance of 3.0m b) a force of 10N moving an object a distance of 5.0m c) a force of 15N moving an object a distance of 3.0m d) a force of 15N moving an object a distance of 5.0m iv) In 1 minute, how much energy does a 100 W electric bulb transfer? A. 100 J B. 600 J C. 3600 J D. 6000 J v) A body is acted upon two unequal and opposite forces along different lines of action. The body will have a)rotatory motion b) translatory motion c) both rotatory and translatory d) neither of them vi)The centre of gravity of a cricket ball is a) at the geometric centre b) along an axis passing through the centre c) anywhere on the surface of the ball d) at the point where it touches the ground vii) A falling raindrop has a)potential energy b)both potential and kinetic energy c)kinetic energy d)None of these 2 viii)What force must be applied to a body through a distance of 10 m such that it does a work of 4000J? a) 200 N b) 400 N c) 100 N d) 300 N ix)The heart of a normal person beats 72 times per minute and does a work of 1 joule per beat, what is the power of the heart? a) 1.2 W b) 1.7 W c) 2.2 W d) 1.5W x) A pulley system having 5 pulleys attached in block and tackle system will have a velocity ratio a) 4 b) 5 c) 3 d) 1 xi)The base of a cooking pan is made heavy and thicker as a)It lowers the heat capacity of the pan b)it increases the heat capacity of the pan c) the food does not get charred and remains hot for long time d) both (a) and (c) xii) Which substance A,B, C or D has the lowest heat capacity if the same amount of heat is given to all the substances for the same time interval? a)B b) A c) all have the same heat capacity d) C xiii) During spearfishing, the fisherman has to aim at a) the tail of the fish b)the head of the fish c)slightly ahead of the head of the fish d)far ahead of the head of the fish xiv)The radiations are given out of a radioactive substance a)affects photographic plates b) ionize gases c) affected by electric and magnetic fields d)all the above 3 xv) Two unequal resistances are connected in parallel by a student. Which of the given statement is true? a)Current is same in both b)current is larger in higher resistance c)voltage drop is lower in lower resistance d) voltage is the same in both resistors. Question 2 (a) Name a metal commonly used to make a calorimeter. Give a reason to support your answer. [2] (b) Draw a well-labelled circuit diagram for the verification of Ohm s law. [2] (c) Why is radioactivity considered to be a nuclear phenomenon? [2] (d) Draw a ray diagram to show how a convex lens can be used as a magnifying glass. [2] (e) A metal ball of mass 60 g falls on a concrete floor from a vertical height of 2.8m and rebounds to a height of 1.3 m. Find the change in K.E. in S.I. units. [2] Question 3 (a)What are superconductors? Write one example. [2] (b) State any two properties of radiation. [2] (c) Scissors for cutting cloth have blades much longer than handles. Why? [2] (d) Two lamps, one rated 40 W, 220 V and the other having resistance 605 (ohm) 60 W, 220 V, are connected in parallel combination across to a 220 V supply. Calculate the current drawn from the supply line. [2] (e) State two precautions to take while handling radioactive substances. Name the radiation which has maximum ionization power. [2] (f) Write two points to differentiate electromagnets from natural magnets. [2] (g) Which cools faster, Land or Water? Give a reason for your answer. Write the SI unit of physical quantity involved in your explanation. [3] SECTION B Answer ANY FOUR questions Question 4 (a) (i) A man having a box on his head, climbs up a slope and another man having an identical box walks the same distance on a levelled road. Who does more work against the force of gravity and why? 4 (ii) Two forces each of 5N act vertically upwards and downwards, respectively on the two ends of a uniform metre rule which is placed at its mid-point as shown in the diagram. Determine the magnitude of the resultant moment of these forces about the midpoint. [4] (b) (i) A body is thrown vertically upwards. Its velocity keeps on decreasing. What happens to its kinetic energy as its velocity becomes zero? (ii) Draw a diagram to show how a single pulley can be used so as to have its ideal M.A. = 2. [3] (c) Show through proper steps that the efficiency of a simple machine is the ratio of mechanical advantage to its velocity ratio. [3] Question 5 (a) (i) Light passes through a rectangular glass slab and through a triangular glass prism. In what way does the direction of the two emergent beams differ and why? (ii) Ranbir claims to have obtained an image twice the object s size with a concave lens. Is he correct? Give a reason for your answer. [4] (b) Observe the figure below in which a conductor is kept between the poles of magnets. i)write the direction in which the conductor deflects when the switch is on. ii)Write the law which helps in finding out the deflection. iii) Why does the conductor deflect? [3] (c) (i) Define the power of a lens. (ii)A convex lens is of focal length 25 cm. Calculate the power of the lens. Question 6 (a) (i) State one important property of waves used for echo depth sounding. 5 [3] (ii) A radar sends a signal to an aircraft at a distance of 30 km away and receives it back after 2 x 10-4 seconds. What is the speed of the signal? [4] (b) A nucleus 11Na24 emits a beta particle to change into Magnesium (Mg) (i)Write the symbolic equation for the process. (iii)How does an electron come out of the nucleus when there are no electrons inside the nucleus? [3] (c) (i) Write one source of IR and UV radiations. (ii) Name the subjective property of light related to its wavelength. [3] Question 7 (a) A refrigerator converts 100 g of water at 20 C to ice at 10 C in 35 minutes. Calculate the average rate of heat extraction in terms of watts. Given: Specific heat capacity of ice = 2.1 J g 1.C 1 Specific heat capacity of water = 4.2 J g 1.C 1 Specific latent heat of fusion of ice = 336 J g 1 [4] (b) An atomic nucleus A comprises 84 protons and 128 neutrons. [3] (i) The nucleus A emits an alpha particle and is transformed into nucleus B. What is the composition of nucleus B? (ii) The nucleus B emits a beta particle and is transformed into nucleus C. What is the composition of nucleus C? (iii) Does the composition of nucleus C change if it emits gamma radiations? (c) Copy the diagram given below and complete the path of the light ray till it emerges out of the prism. The critical angle of glass is 42 . In your diagram mark the angles wherever necessary. [3] Question 8 (a) A battery of emf 12 V and internal resistance 2 is connected with two resistors A and B of resistance 4 and 6 respectively joined in series. 6 Find : (i) Current in the circuit (ii) The terminal voltage of the cell. (iii)The potential difference across 6 Resistor. (iv) Electrical energy spent per minute in 4 resistor. [4] (b) (i) Name the phenomenon involved in tuning a radio set to a particular station. (ii)Define the phenomenon named by you in part (i) above. (iii) What do you understand by the quality of sound? [3] (c) (i) Name the waves used for echo depth sounding. (ii)Give one reason for their use for the above purpose. (iii) Why are the waves mentioned by you not audible to us? [3] Question 9 (a) An object is placed at a distance of 12 cm from a convex lens of a focal length of 8 cm. Find : [4] (i)the position of the image (ii) nature of the image. (b) A lens forms an upright and diminished image of an object when the object is placed at the focal point of the given lens. [3] (i) Name the lens. (ii) Draw a ray diagram to show the image formation. (c) (i) Find the equivalent resistance between A and B. (iii) [3] State whether the resistivity of a wire changes with the change in the thickness of the wire. 7 ----------------------------------------------------------------------------------------------- 8

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