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ICSE Class X Mid-term 2023 : Physics

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Raza Masood
Dr. Virendra Swarup Memorial Public School (VSMPS), Kanpur

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Dr. VirendraSwarup Public School, Civil Lines,Kanpur Prelims Examination 2022 23 Class : X Subject : Physics Time : 2 Hr MM:80 Instructions SECTION A is compulsory Attempt any four questions from SECTION B SECTION A (40 Marks ) Question 1 [15] Choose the correct answers to the questions from the given options : i. S.I. unit of moment of couple a) Nm b) N/m c) Ncm d) N/cm ii. The specific heat capacity depends on a) Rise in temperature b) Nature of substance c) Amount of heat supplied d) Mass of substance iii. Which of the following quantity remains constant in a uniform circular motion : a) Velocity b) Speed c) Acceleration d) Both velocity and speed iv. Select the incorrect statement : a) A machine always has the efficiency less than 100 %. b) The mechanical advantage of a machine can be less than 1 c) The mechanical advantage of a machine can be equal to 1 d) The mechanical advantage can be greater than velocity ratio. v. The mechanical advantage of an ideal fixed pulley: a) More than 1 b) Equals to 1 c) Less than 1 d) Equals to 2 vi. Superconductors are the substances in which : a) Resistance is infinite b) Resistance is zero at high temperature c) Resistance is finite at absolute zero d) Resistance is zero at a very low temperature vii. For which colour critical angle is more : a) Green b) Yellow c) Orange d) Red The highest refractive index is of : a) Glass b) Water c) Diamond d) Ruby The source of ultraviolet light is: a) Electric bulb b) Red hot iron ball c) Sodium vapour lamp d) Carbon arc lamp. In emission from a radioactive substance ,an electron is ejected.This electron comes from a) The outermost orbit of an atom b) The inner orbits of atom c) The surface of substance d) The nucleus of an atom An electrical appliance has a rating 100 W ,120 V. The resistance of element of appliance when in use is : a) 1.2 b) 144 c) 120 d) 100 A convex lens immersed in water . Its focal length will a) Increase b) Decrease c) Remains same d) None of these. To detect the obstacles in their path ,bats produce a) Infrasonic waves b) Radio waves c) Electromagnetic waves d) Ultrasonic waves A tuning fork of frequency 256 Hz will resonate with another tuning fork of frequency : a) 128 Hz viii. ix. x. xi. xii. xiii. xiv. b) 256 Hz c) 384 Hz d) 502 Hz xv. The direction of induced current is obtained by : a) Fleming s left hand rule b) Clock rule c) Right hand thumb rule d) Fleming s right hand rule Question 2 a. An enemy plane is at a distance of 300 km from a radar. In how much time the radar will be able to detect the plane? Take velocity of radio waves as 3 108 m s-1. [2] b. Two bodies A and B have masses in the ratio 5:1 and their kinetic energies are in the ratio 125:9. Find the ratio of their momenta [2] c. State the conditions required for total internal reflection of light to take place. [2] d. State the position of the object in front of a converging lens if: [2] (i) It produces a real and same size image of the object. (ii) It is used as a magnifying lens e. How will you differentiate between a convex and a concave lens by looking at a printed page ? [2] f. A ray of light XY passes through a right angled isosceles prism as shown below. [2] (i) What is the angle through which the incident ray deviates and emerges out of the prism? (ii) Name the instrument where this action of prism is put into use g. The diagram below shows a pulley arrangement : [3] (i) Copy the diagram and mark the direction of tension on each strand of the string. (ii) What is the velocity ratio of the arrangement? (iii) If the tension acting on the string is T, then what is the relationship between T and effort ? Question 3 a. The following diagram shows a 60 , 30 , 90 glass prism of critical angle 42 . Copy the diagram and complete the path of incident ray AB emerging out of the prism marking the angle of incidence on each surface. [2] b. Specific heat capacity of a substance A is 3.8 J/gK and of substance B is 0.4 J/gK. [2] i. Which substance is a good conductor of heat ? ii. How did you arrive at your conclusion ? c. Calculate the net moment of force of each force of 10 N about O. [2] d. A nucleus zXA emits 2 particles and 1 particle to form a nucleus 222. Find the atomic number and mass number of X [2] 85R e. A straight wire lying in a horizontal plane carries a current from north to south . [2] i. What will be the direction of magnetic field at a point just above it? ii. Name the law used to arrive at the answer in part (a). SECTION-B (40 Marks) (attempt any four questions) Question 4 a. Why is it easier to open a door by applying the force at the free end of it ? [2] b. An alpha particle captures two electrons so it changes into the gas: [2] i. Name the gas that formed. ii. Why is alpha particle not used in radio therapy ? c. A virtual, diminished image is formed when an object is placed [3] between the optical centre and the principal focus of a lens. (i) Name the type of lens which forms the above image. (ii) Draw a ray diagram to show the formation of the image with the above stated characteristics. d. Orange light of wavelength 6600 travelling in air gets refracted in water.If the refractive index of water is 4/3,find : (i) the frequency of light in air,(ii) the speed of light in water ,and(iii) the wavelength of light in water. [3] Question 5 a. Two fuse wires are rated 5A and 20 A.Which of the two is [2] i. Thicker ii. longer b. Two waves of the same pitch have amplitudes in the ratio 1 : 3. What will be the ratio of their: [2] (i) intensities and (ii) frequencies? c. An object AB is placed between O and F1 on the principal axis of converging lens as shown in the diagram. Copy the diagram and by using three standard rays starting from point A, obtain an image of the object AB. [3] d. A uniform metre rule of mass of 100g is balanced on a fulcrum at mark 40 cm by suspending an unknown mass m at the mark 20 cm. [3] (i) Find the value of m (ii) To which side the rule tilt if the mass m is moved to the mark 10 cm ? (iii) How can it balanced by another mass of 50g. Question 6 a. The diagram shows two coils of several turns of copper wire near a magnet i. In which direction the needle of galvanometer deflects. ii. Name the law used to arrive at the conclusion in part (i) b. How does the angle of minimum devaition of prism varies with increase in [2] (i) Wavelength of incident light (ii) Refracting angle of the prism c. Name the waves : [3] (i) used in sterelising purposes (ii) used for taking photographs in dark (iii)absorbed by the ozone layer. d. 45 g of water at 50 C in a beaker is cooled at 18 C is added to it. The contents are stirred till a final constant temperatureis reached. Calculate the final temperature. The specific heat capacity of water is 4.2 J/gK and of copper is 0.39J/g. [3] Question 7 a. A lens forms the image of an object placed at a distance of 45 cm from it on a screen placed at a distance 90 cm on other side of it. i. Name the lens ii. Find the focal length of the lens iii. Magnification of image b. The adjacent diagram shows three different modes of vibrations P, Q and R of the same string. (i) Which vibrations will produce a louder sound and why ? (ii) The sound of which string will have maximum shrillness ? (iii) State the ratio of wavelengths of P and R. c. A man raises a box of mass 50 kg to a height of 2m in 20 s,while another man raises the same box to the same height in 50 s. [4] (i) Compare the work done and power developed by them (ii) Calculate the power developed by each man .(g=10m/s2) Question 8 a. If the net resistance of the circuit is 5 ,then calculate the value of R1 [2] b. (i) A person is tuning his radio set to a particular station. What is the person trying to do to tune it ? [1] (ii) Name the phenomenon involved, in tuning the radio set. [1] c. A pendulum has a frequency of 5 vibrations per second .An [3] observer starts the pendulum and fires a gun simultaneously.He hears echo from the cliff after 8 vibrations of the pendulum.If the velocity of soumd in air is 340m/s,find the distance between the cliff and the observer. d. (i) Water in lakes do not freeze at once in cold countries. Give a reason in support of yopur answer . (ii) What is the principle of calorimetry ? (iii)Name the law on which principle is based. [3] Question 9 a. When a potential difference of 2 volt is applied across the ends of a wire of 5m length,a current of 1 A flows through it .Calculate : [2] i. The resistance per unit length of the wire. ii. The resistance across the ends of the wire if it is doubled on itself b. If a man playing a flute closes the holes of a flute near its mouth,then [2] i. Will the pitch of the note increase or decrease ? ii. Give a reason for your answer. c. The diagram below shows the magnetic needle kept below the conductor AB in the North-South direction (i) In which direction will the needle deflect when the key is closed? (ii) Why is the deflection produced? (iii) What will be the change in the deflection if the magnetic needle is taken just above the conductor AB? d. (i) Name the radio isotope which is used in determining the age of excavated material. (ii)Arrange the , and radiations in increasing order of ionising power. (iii) A nucleus of mass number 238 and atomic number 92 is radioactive when it emits two particles and is transformed into a nucleus of B.What is the composition of B ?

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