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ICSE Class X Prelims 2023 : Physics (Bhaktivedanta Swami Mission School (BSMS), Mumbai)

8 pages, 74 questions, 1 questions with responses, 1 total responses,

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PRELIMINARY EXAMINATION (2022-2023) PHYSICS STD: X DATE: 06/01/23 M. Marks: 80 Time: 2 hours Answers to this paper must be written on the paper provided separately. You will not be allowed to write during 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. Section A is compulsory. Attempt any four questions from Section B. The intended marks for questions or parts of questions are given in brackets [ ]. SECTION -A (Attempt all questions from this Section.) Question 1 Choose the correct answers to the questions from the given options: [15] (i) A nut is opened by a wrench of length 10 cm. If the least force required is 5.0 N, then moment of force needed to turn the nut is : (a) 0.5 N m (b) 50 N m (c) 2 N m (d) 20 Nm (ii) A radioactive element undergoes a gamma decay. Then the atomic number of the daughter nucleus (a) decrease by 2 (b) increases by one (c) decreases by one (d) no change (iii) One watt is: (a) kg m2s 3 (b) kg m s 3 (c) kg2m2s 2 (iv) In refraction of light through a prism, the light ray: (a) Suffers refraction only at one face of the prism (b) Emerges out from the prism in a direction parallel to the incident ray (c) Bends at both the surfaces of prism towards its base (d) Bends at both the surfaces of prism opposite to its base (v) The characteristics of sound which shows shrillness of sound is: (a) Quality (b) Amplitude (c) Pitch Page 1 of 8 (d) kg m s 2 (d) Loudness (vi) In which of the following diagrams is the refraction not correct: (vii) The ratio of the amplitude of A: amplitude of B is: (a) 5:2 (b) 1:2 (c) 2:1 (d) 2:3 (viii) Two devices are connected between two points say A and B in parallel. The physical quantity that will remain the same between the two points is: (a) current (b) voltage (c) resistance (d) none of these (ix) From the power rating of any electrical appliance, we can find : (a) The resistance of the appliance (b) The safe limit of current which can flow through the appliance (c) Both (a) and (b) (d) Cost per usage. (x) A soft iron bar is introduced inside a current carrying solenoid. The magnetic field inside a solenoid: (a) Decrease (b) Will increase (c) Will become zero (d) Will remain unaffected (xi) Heat capacity per unit mass of a body is called : (a) Latent heat (b) Specific heat (c) Heat energy (d) None of these (xii) When a conductor carrying current is placed in a magnetic field, perpendicular to it then the direction of the force experienced can be found out by using: (a) Lenz's law (b) Fleming s left, hand rule (c) Fleming's right hand rule (d) Right hand thumb rule Page 2 of 8 (xiii) Two hot bodies A and B are kept in contact. After sometime it is found that there is no heat flow between the two. This means ; (a) The temperature of body A is higher than B (b) The temperature of body B is higher than A (c) Two bodies have same temperature (d) You cannot say anything about the temperature (xiv) To detect the obstacles in their path, bats produce : (a) Infrasonic waves (b) (c) Electromagnetic waves (d) Ultrasonic waves Radio waves (xv) A 500 g stone is thrown vertically upwards with a speed of 15 ms 1. Its potential energy at the highest point is: (a) 48.25 J (b) 56.46 J (c) 57.25 J (d) 56.25 J Question 2 (i) (a) (b) (c) (ii) How many pulleys there in a movable block of a block and tackle system with velocity ratio 3? A radioactive nucleus emits a gamma ray. Does the position of daughter nucleus change in a periodic table as compared to the parent nucleus ? To which electrically charged plate a gamma ray will deflect while passing through an electric field ? [3] A, B and C are three forces each of magnitude 4 N acting in the plane of paper as shown in the figure. The point O lies in the same plane. [2] (a) (b) Which force has the least moment about O? Which force has the greatest moment about O? Page 3 of 8 (iii) A uniform metre scale is in equilibrium position. Calculate the mass of the ruler. [2] (iv) If kinetic energy of a moving body is 40J, then what will be its kinetic energy when its velocity is doubled ? [2] (v) (a) (b) Name the phenomenon involved in tuning a radio set to a particular station. Define the phenomenon named by you in part (a) above (a) Sketch a graph to show the change in potential difference across the ends of an ohmic resistor and the current flowing in it. Label the axes of your graph. [2] What does the slope of the graph represent ? (vi) (b) [2] (vii) A force F acts on a body and displaces it by a distance S in a direction an angle with the direction of force, what should be the angle between the force and displacement to get: (a) zero (b) maximum work? [2] Questions 3 (i) An object AB is placed in front of a convex lens as shown below. Copy the diagram and complete it to show the refraction of two rays emerging from the point B. (ii) (a) (b) Is it possible to switch off an appliance by placing the switch in a neutral wire? Is it possible for current to flow between a neutral and an earth wire? (iii) How is the magnetic field around a straight conductor affected if: (a) current through the conductor is increased ? (b) distance of the point of observation is increased? [2] [2] [2] (iv) A metal of mass 250g is heated to a temperature of 65 C. It is then placed in 50 g of water at 20 C. The final steady temperature of water becomes 25 C. Neglecting the heat taken by the container, calculate the specific heat capacity of the metal. [2] (v) Complete the following reaction using the appropriate subscripts or superscripts where missing 1 92 U + 0 n Ba + 36 Kr + 3 01 n [2] Page 4 of 8 SECTION - B (Attempt any four questions.) Question 4 (i) Figure below shows the refraction and emergence of a ray of light incident on a rectangular glass slab. Copy the diagram. (a) Mark the lateral displacement of the incident ray (b) Name the two factors on which the lateral displacement depends. [3] (ii) The critical angle for the glass which the equilateral prism ABC is made of is 48 . A ray of light incident on the side AB of the prism is refracted along DE such that the angle it makes with the side AC is 138 as shown in figure below. Also, EDB = 90 . Copy the diagram. (a) Draw the path of ray incident on the side AB (which travels along DE). (b) Show the path along which the ray DE travels from point E onwards through the side BC. [3] (iii) In the figure below a source of light S is placed at the bottom of a beaker containing water. (a) Copy the diagram and show the path of rays, marked with arrows after they meet the water air boundary. (b) Name the phenomenon exhibited by ray marked with three arrows. . [4] 48 Page 5 of 8 Question 5 (i) (a) (b) (c) (a) (b) Which particles are responsible for current in conductors? [3] To which wire of a cable in a power circuit should the metal case of a geyser be connected? To which wire should the fuse be connected? (ii) Which radiation produces maximum biological damage? [3] What happens to the atomic number or mass number of an element, when the radiation named by you in part (a) above are emitted? (iii) A 6 V battery is connected to the arrangement of resistances given below. Calculate: (a) the total effective resistance of the arrangement and (b) the total current flowing in the circuit. [4] Question 6 (i) A ray of light PQ is incident normally on the hypotenuse of a right-angled prism ABC as shown in the diagram. [3] (a) Copy the diagram and complete the path of the ray PQ till it emerges from the prism. (b) What is the value of the angle of deviation of the ray? (c) Name an instrument where this action of the prism is used. (ii) A prism deviates a monochromatic ray of light through an angle , where the angle of incidence at the surface of the prism is i. (a) Draw a graph showing the variation of with i. On your graph, show the angle of minimum deviation. (b) What is the relation between the angle of incidence and the angle of emergence when the ray suffers minimum deviation? [3] (iii) (a) (b) With the help of a well labeled diagram, show that the apparent depth of an object such as a coin in water is less than its real depth. How is the refractive index of water related to the real depth and the apparent depth of a column of water? [4] Page 6 of 8 Question 7 (i) Figure shows an arrangement of four pulleys. A load L is attached to the movable lower block and an effort E is applied at the free end of the string. Copy the diagram and [3] (a) draw arrows to indicate tension in each part of the string. (b) calculate the mechanical advantage of the system (ii) A uniform metre scale is kept in equilibrium when supported at the 60 cm mark and a mass M is suspended from the 90 cm mark as shown in the figure. State with reasons, whether the weight of the scale is greater than, less than or equal to the weight of mass M. [3] (iii) A girl of mass 35 kg climbs up from the first floor of a building at a height 4 m above the ground to the third floor at a height 12 m above the ground. What will be the increase in her gravitational potential energy? (g = 10 ms 2) [4] Question 8 (i) A man standing in front of a vertical cliff fires a gun. He hears the echo after 3 seconds. On moving closer to the cliff by 82.5 m he fires again. This time, he hears the echo after 2.5 seconds. Calculate: (a) the distance of the cliff from the initial position of the man. (b) the velocity of sound [3] (ii) In the nuclear reaction given below, a nucleus X changes to another nucleus 226 88 X Y + + energy (a) (b) (c) What are the atomic number and mass number of Y? Name the gas formed when alpha particle acquires two electrons. What is the effect on the motion of alpha particles when it passes through a region containing a magnetic field? [3] Page 7 of 8 (iii) Two pendulums C and D are suspended from a wire as shown in the figure. Pendulum C is made to oscillate by displacing it from its mean position. It is seen that D also starts oscillating, [4] (a) (b) (c) (d) Name the type of vibrations, C will execute. Name the type of vibrations, D will execute. If the length of D is made equal to C then what difference will you notice in the oscillations, of D ? What is the name of the phenomenon when the length of D is made equal to C ? Question 9 (i) There are three pins in an electric plug top. Answer the following: (a) How would you identify the earth pin ? (b) In which of the three connecting wires should the electric switch be connected ? (c) Explain why a switch should not be touched with wet hands. (ii) (a) (b) (c) [3] What name is given to a cylindrical coil of diameter less than its length? If a piece of soft iron is placed inside the coil mentioned in part (a) and current is passed in the coil from a battery, what name is then given to the device so obtained ? Give one use of the device mentioned in part (b). [3] (iii) A hot iron ball of mass 0.2 kg is dropped into 0.5 kg of water at 10 C. The resulting temperature is 30 C. Calculate the temperature of the hot ball. Specific heat capacity of iron = 336 J kg 1 C 1 and specific heat capacity of water = 4200 J kg 1 C 1 [4] *************************************************************************************** Page 8 of 8

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