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ICSE Class X Prelims 2026 : Physics (S N Kansagra School (SNK), Rajkot) : prelim

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SNK Black School Grade 10 Physics Prelim 2 (2025-26) Max Marks: 80 Time allowed: Two hours Answers to this Paper must be written on the paper provided separately. You are not allowed to write in 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. 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 (40 marks) (Attempt all questions from this section) Question 1 Choose the correct answers to the questions from the given options. [15] a) What must be the minimum distance between the source of sound and reflecting body for hearing an echo A) 12 m B) 51 m C) 24 m b) What is radius of circular body shown below if moment of couple is 9 Nm. D) 17 m A) 30 cm B) 60 cm C) 10 cm D) 15 cm c) What name is given to a light which consists of only one colour or one wavelength A) Infrared C) Ultraviolet B) Polychromatic D) Monochromatic d) A current of 0.2 A flows through a conductor of resistance 4.5 . Calculate potential difference at the ends of conductor. A) 9 V C) 0.225 V B) 2.25 V D) 0.9 V e) If a ray of light travels without deviation on passing through the optical boundary of two transparent mediums, which of the following is NOT true for the given situation A) Light ray makes 0 with the surface B) Light ray makes 90 with the surface C) Angle of incidence is same as angle of refraction D) Speed of light does not change if refractive index for both the medium is same f) A concave lens always forms: A) real, inverted and enlarged image C) virtual, erect and enlarged image B) virtual, erect and diminished image D) virtual, inverted and enlarged image g) Commutator is a device in a D.C. motor which : A) increases the strength of electromagnet. B) increases the power. C) reverses direction of current after half rotation of coil. D) reverses direction of current coil after full rotation of coil. h) In the adjoining diagram if the load is raised by 1 inch, through what distance will effort move? A) 1 inch B) 3 inches C) 5 inches D) 2 inches i) A metal piece of mass 5 g has thermal capacity 2.5 J.K 1. If the mass of the metal is tripled, then what will be its specific heat capacity? A) 7.5 JK 1 C) 1.5 Jg-1K 1 B) 2.5 JK 1 D) 0.5 Jg-1K 1 j) The diagram below shows four sound waves. Which sound has the highest pitch? A) Wave A C) Wave C B) Wave B D) Wave D k) Which one of the following combinations is the correct ascending order of electromagnetic waves in terms of wavelength? A) Gamma-rays, microwaves, visible light C) Gamma-rays, visible light, microwaves B) Microwaves, visible light, gamma-rays D) Microwaves, gamma-rays, visible light l) What is the frequency of alternating current supply in Indian households? A) 50 Hz C) 220 Hz B) 60Hz D) 440 Hz m) What will be the ratio of the velocities of light of wavelengths 4000 and 8000 in Vacuum A) 1:2 C) 2:1 B) 4:1 D) 1:1 n) In the given circuits Y and Z, the resistors, R1 and R2, are connected in which combination? A) parallel in Y and series in Z C) series in both the circuits B) parallel in Z and series in Y D) parallel in both the circuits o) Specific heat capacity (calg -1C-1) of lead, aluminum, copper and iron are 0.031, 0.21, 0.095 and 0.115 respectively. In which of these metals will the rise in temperature be lowest? A) lead C) aluminum B) copper D) iron Question 2 a) Complete the following by choosing the correct answers from the brackets: i. [6] Two copper wires can have the different_________ [resistivity / resistance] but will have same [resistance / resistivity] ii. In a block and tackle system, increase in the weight of the movable block________ [decreases / increases] the efficiency of the pulley system. iii. Heat absorbed during change of phase depends on __________ [mass / change in temperature] of the substance. iv. Two sound waves X and Y have the same amplitude and the same wave pattern but their wavelengths are 17 m and 17 mm respectively. Sound wave ___ is shriller than __ [X / Y] v. A convex lens has magnification -3 for a particular placement of object. That means it is producing _________ image. [virtual & diminished / real & magnified] vi. Tin is written as 119Sn50. Which means it consists of ___ neutrons [50 / 69] b) Solve the following questions: i. A body of mass 5 kg is moving with a velocity of 10 ms-1. What will be the ratio of its initial kinetic energy and final kinetic energy. if the mass of the body is doubled and its velocity is halved? ii. [2] An ultrasonic wave is sent from a ship towards the bottom of the sea. It is found that the time interval between the sending and the receiving of the wave is 1.5 seconds. Calculate the depth of the sea if the velocity of sound in sea water is 1400 ms-1. [2] Question 3 a) Match the movement of the body part in Column A to the class of lever in Column B. Movement of the body part [2] Class of lever Column A Column B (a) Nodding head Class III (b) Lifting body weight on your toes Class II Class I b) The image given below displays kilowatt-hour meter readings recorded at two distinct points in time. Assuming a continuously running 2000 W air conditioner as the sole electrical device in use, calculate the time interval, in hours, from these meter readings. [2] c) Explain how the thickness of strings in a stringed musical instrument, such as the Sitar, helps produce high and low pitches of sound. [2] d) A straight conductor PQ carrying current is placed in a magnetic field as shown in the diagram. i. ii. State the direction of current in the conductor P Q for the conductor to experience an upward force. [1] Name the rule used to determine this. [1] e) Calculate the amount of heat absorbed by 200 g of paraffin wax to melt completely at its melting point. Specific latent heat of fusion of paraffin wax = 146 Jg 1 f) List two ways of safely disposing nuclear waste [2] [2] g) Answer the following questions. i. What are Isobars? ii. What is the name given to elements having same number of neutrons but different number of iii. [1] nucleons? [1] Give example of one pair of Isotopes. [1] SECTION B (40 Marks) (Attempt any four questions from this Section) Question 4 a) State in brief, the meaning of each of the following: i. The heat capacity of a body is 50 JK-1 [1] ii. The specific latent heat of fusion of ice is 336000 J kg-1 [1] iii. The specific heat capacity of copper is 0.4 J g-1oC-1. [1] b) Chhagan while playing a flute and Magan while playing a piano are emitting sounds of same pitch and loudness i. Name one characteristic that is different for waves from the two different instruments. [1] ii. If now the loudness of the sound from flute becomes four times that of the sound from piano, then write the value of the ratio AF: AP (AF amplitude of sound wave from flute, AP amplitude of sound wave from piano). [2] c) The object AB is placed in front of a lens LL as shown below. i. Which lens is depicted here? [1] ii. What is the name given to x? [1] iii. Copy and complete the diagram to show the formation of the image of the object AB. [2] Question 5 a) A convex lens of focal length 10 cm is placed at a distance of 60 cm from a screen. Determine how far from the lens should an object be placed so as to obtain a real image on the screen? [3] b) A block and tackle system of pulleys has velocity ratio 5. i. Draw a labelled diagram of the system indicating clearly, the direction of the load and the effort.[2] ii. What is the value of the mechanical advantage of the given pulley system if it is an ideal pulley system [1] c) Solve the following for the circuit shown in the diagram. i. Which two resistors are in series with each other? [1] ii. Calculate current in the circuit [2] iii. Calculate terminal voltage of the battery. [1] Question 6 a) The 6.4 kJ of energy causes a displacement of 64 m in a body in the direction of force in 2.5 seconds. Calculate the following i. applied force [1] ii. power in SI unit and in hp. [2] b) A ray of light is incident normally on the hypotenuse face of a right-angled isosceles prism made of glass. Illustrate how the ray travels into and out of the prism using a labeled diagram. [3] c) The diagram below shows a vibrating tuning fork E mounted on a sound box X. When the vibrating tuning forks A, B, C and D are placed on the sound box Y one by one, it is observed that a louder sound is produced when the tuning fork B is place on Y. i. What is the frequency of tuning fork E? [1] ii. State the phenomenon occurring when louder sound is produced [1] iii. List two applications of this phenomenon [2] Question 7 a) 85 g of water at 30 C is cooled to 5 C by adding certain mass of ice. Determine the mass of ice required. [Specific heat capacity of water = 4.2 J g 1 C 1, Specific latent heat of fusion = 336 J g 1]. [3] b) Do as directed: i. ii. A fuse is rated 8 A. Can it be used with an electrical appliance rated 5 KW, 200 V? Support your answer with necessary calculation. [2] Write name of any one safety device apart from fuse. [1] c) Radiations given out from a source when subjected to an electric field in a direction perpendicular to their path are shown below in the diagram. The arrows show the path of the radiation A, B and C. Answer the following questions in terms of A, B and C. i. Name the radiation B which is unaffected by the electronic field. [1] ii. Which among the three causes the least biological damage externally? [1] iii. Why does the radiation C deflect more than A? [1] iv. Name the radiation which is used in carbon dating. [1] Question 8 a) A meter scale of weight 50 gf can be balanced at 40 cm mark without any weight suspended on it. Answer the following in context of the same i. Calculate the minimum weight that must be placed on this meter ruler to balance this ruler when it is pivoted at its center? ii. [2] If this ruler is cut at its center, then state which part [0 to 50 cm or 50 to 100 cm] of the ruler will weigh more than 25 gf. [1] b) A certain amount of heat will warm 1 g of material X by 10 C and 1 g of material Y by 40 C. i. Which material has higher specific heat capacity? [1] ii. Which material, X or Y, would you select to make a calorimeter? [1] iii. The specific heat capacity of a substance remains the same when it changes its state from solid to liquid. State True or False. [1] c) As shown in the below diagram Champak stands between two cliffs and claps his hands. Speed of sound in air 320 ms 1. Determine the following: i. Time taken by her to hear the first echo [2] ii. Time taken by her to hear the second echo [2] Question 9 a) Complete and rewrite the radioactive reaction. __ + %&! $% __ !" [3] ( + $% __ + 3 ' b) Answer the following. i. Which invisible radiations are studied using the quartz prism? [1] ii. State one use of these radiations. [1] iii. State name of one radiation having the wavelength longer than the wavelength of this radiation. [1] c) The diagram shows a coil wound around a U shape soft iron bar AB. i. State name of this device. [1] ii. What is the polarity induced at the ends A and B when the switch is pressed? [1] iii. Mention one use of this device [1] iv. Suggest one way to strengthen the magnetic field generated by this device [1]

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