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ROYAL ACADEMY PRE-BOARD EXAMINATION CLASS-X SUBJECT-Physics SESSION: 2022-2023 Full Marks : 80 Time : 2.00 Hrs. Section-A 1) The moment of force of 2N about . a point is 7N-m. The distance of pointis- c. 5 m b. 0.35 mn 3m at of A force of 20N displaces a body by distance done will be a. 30J ili. A man exerts force a of 600N in pushing a car b. 7200 WN Which of the following isotope of uranium is b.U-238 a. U-234 on road are seen on and desert in Mirage phenomenon is responsible for this ? a. 8200 WN iv. vi. vii. at a speed to its own direction. The vork by man d. All of these c. U-235 hot summer index, then its c. zero days. critical Whiclh of the angle will following physical be d. equal lateral displacement ? Which of the following colour has most d. Violet c. Green b. Blue a. Red low is greater than the frequency of a note with The frequency of a note with high pitch ? is correct Which statement about the note with the high pitch waves travelling piteh. b. it has smaller wavelength d. It has lower speed in air. c.It has greater speed in air When sound is- d. 8300 c. 7300 WN c. Reflection b. highest of 60 unstable ? b. Refraction The diamond has maximum refractive of the force from this d. 20J of 12 m/s. The power exerted d. Deviation a. It has larger wavelength. ix. angle a. Total internal reflection a. lowest vii. an c.35.J b. 75J point d. 3.5 m a. 3 m . 15 Choose the correct answer to the questions from the given options in air enter into another medium, quantity which remains unchanged is b. velocity d. None of these cm. Its power is d.-4 D C.-2 D in an electric circuit and the potential difference The current flowing through a resistor connected resistor is below. The valuc of the resistance of the applied across its ends are shown in figures a. wavelength c. frequency A convex lens has focal length of 50 b. +4D a. +2D xi. 100 0- 300 0 Ammeter (mA) xii. 2 200 b. 5 a.12 in the figure below shown is A 3-pin plug Page No. 1 c. 82 3 voltmeter (V) d. 10 2 I O III/ II The pin-l is used as b. neutral wire d. All of these a. live were c. earth wire xii. consisting a bob made up of copper I1LLLLLUiLILLLLLL1 A set up and a strong magnet is shown below ULLULILLIILLLLL OMagnet Bob Bob in the absence of When bob is released from some height, it comes to vertical position very quickly in the presence of the magnet. Which of the magnet. But is comes to vertical position slowly statement given here supports this observation correctly ? a. Copper is magnet in nature. b. A current is induced in the copper which opposes it motions. c. Magnet opposes motion. xiv. XV. d. None of the above Specific heat capacity of a body having temperature from 35 C to 45 C is b. 200 J kg" K a. 400 J kg'K' c. 100 J kgK' Heating curve for 500g mass which required 2000 J of heat to raise its d. 500 J kg K water is shown below without temperature marking E D Time Which curve represent boiling? d. EF C. DE b. CE a. Write two differences between a single fixed pulley and a single movable pulley. b. Rewrite and complete the following nuclear reaction by filling in the atomic number of Ba and a. CD 2.i. mass number of Kr. 235U+ 144 Ba+3 Why do the wine glasses Page No. 2 have a Kr+ 30n + Energy heavy and broad base? ii. heter sCale is vi. vit. 3. i. ii. ii. iv. balanced on a knife-edge at its centre. 10g weight is put on top the scale is found to be balanced at 45.0 cm. of the scale at the Fstablish the relation What is the mass of the meter scale between SI unit and CGS unit of A loree is moment force. applied on a body of mass 20 kg moving with a velocity of 40 ms. Th body attains a velocity of 50 ms in 2s. Determine the work done by the body. Two waves of the same have thcir . amplitude in the ratio 2: 3. what will be the ratio pitch of their loudness ? b. what will be the ratio of their Cn mark, a. Define terminal b. Caleulate potential. the work done in frequencies ? moving charge of 4C from a a point at 220V to a point at 230 V. Draw a labelled diagram showing how an image of a small (3+2+2+2+2+2+2) slide can be projected on State two characteristics of large screen. the image. In an eleetrical circuit, three incandescenct bulbs A, B and C of ratings 40 W, 60 W and 100 W respectively, are connected in parallel to an clectric source. Write the order of brightness. Write the important characteristies of -particles. magnetic compass needle is placed in the plane of paper near point which plane should a straight current carrying conductor be placed, A and there is A as shown in figure. In that it passes through A in the deflection of the compass ? Under what condition is the deflectioon so no change maximum and why ? A S i) Define one kilo-calorie of heat. ii) Why is the base of a coolking pan thick and heavy ? (2+2+2+2+2) Section-B 4. i. i. Alornp any fowr qudi (a) A glass slab i placed over a page on which of the word VIBGYOR is printed with each letter in its corresponding colour. 1. Will the image of all the letters be in the same place ? II. If not, state which letter will be least raised. Give a reason for your answer. (b) What will be the colour of an object which appears green in white light and black in red light? (a) State the dependence of angle of deviation. L On the refractive index of the material of the prism II. On the wavelength of light. (b) Copy the diagram given below and complete the path of light ray till it emerge out of the prism. The critical angle of glass is 60. In your diagram, mark the angles wherever necessary. P Q B iii. 60 60 /\ (a) How is the refractive index of water related to the real depth and the apparent depth of a column of water ? (b) Ruchi puts a pencil into a glass container having water and is surprised to see the pencil in a different state. I. What change is observed in the appearance of the pencil1? Page No. 3 II. Name the phenomenon responsible for the ehange. Il. Draw a ray diagram showing how the eye sees the pencil. Pind 5. i. the distance at which an objcct should be em to obtain an image of doulble its size. How does the angle of deviation formed ii. by a placed a graph showing the variation in the angle object An is placed at a distance 24 cm convex of deviation with the prism surface. ii. a lens of local increase prism change with the incidence? Draw 3+3+4 in front of in front of a convex lens of focal angle length in the length 10 angle of incidence at of a 8 cm. (a) What is the nature of the image Srem-tke-lens Caleulate the distance of the image from the lens. (c) Caleulate the magnification of the image. (b) 3+34 The figure below shows a pulley arrangement._ 6. i. B E Load strand of the string. and mark the direction of tension on each the arrangement ? (b) What is the velocity ratio of betwecn T and effort E? the on tension aeting string is T, then what is the relationship (c) of centre of gravity lie for (a) Where does the position II.solid cone? I. hollow cone and rotational motion. of 1n (b) I. Give one example pure of 0 tah0n particles on the axis of II. Comment on the movement pure rotational motion. fall and reach the ground. What at a height of Sm. It is allowed to it is a (a) A body of mass 10 kg is kept the body at the height of 2 m assuming is the total mechanical energy possessed by (a) Copy the figure Ifthe ii. ii. frictionless medium? as shown the point A of a frictionless track xyz (b) A particle is placed at the (Take, g reaches y. it point when its slightly towards right. Find speed = figure. 10 m/s') in It is pushed A 1m 0.5 m (34344 7.i. free vibration ? (a) of a lake takes 3s to reach surface the (b) A sound made on ? the water at the same depth to reach a diver inside of sound in air 300 m/s.) Where can a body execute = (Take, velocity velocity of sound Page No. 4 in water = 1440 m/s) a takee boatman. How much time will it (c) State two difference between light waves and sound waves. (a) Is it possible for a hyd rogen (tH) nucleus to emit an alpha particle ? Give a reason for your ii. answer. (b) Complete the reaction He+H *He2 t....Energy A narrow beam of white light is passing through a glass prism ABC as shown in the diagram. D iii. Q P B Trace it on your DE. (a) Write the E Glass prism answer sheet and show the path of the emergent beam as observed on the screen of the phenomenon observed. this phenomenon observed? (b) Where else in nature is the constituents of the conclusion which can be drawn about state observation Based on this name and cause (c) white light. 8.1 (a) (4+3+3 decreases with rise of temperature. Name the three materials whose resistivity and more in series combination ? resistance became less in parallel combination (b) Explain, why (a) sRn is converted ii. into s4Po1 Write down the corresponding equation. measures to be (b) Write a note on the safety iii. An electric is 25 C. of water) and the room temperature 3.00 Rs. is per unit of (a) If the cost of electricity (b) ii. during if the What will be the corresponding cost electricity, room plant establishment of nuclear power min to boil 4 cups kettle used to prepare tea, takes 2 water. 9. i. taken of water (1 cup contains 200 calculate the cost of temperature drops boiling cm 4 cups of to 5 C ? (3+3+4 A sample of liquid is 80 C and the room temperature is 30 C. The melting point of naphthalene graph to a temperature-time Draw down to the room temperature. naphthalene at 100 C is cooled the process. to freezing which corresponds In this graph, mark the region represent this cooling. from the graph. State the forms of naphthalene of copper of mass 42 g. When a certain mass a calorimeter niade in taken 104 g of water at 30 C is mixture after the ice has melted, final steady temperature of the of ice at 0 C is added to it, the Find the mass of ice added. was found to be 10 C. latent heat of fusion of ice 336 Jg water 4.2 Jg" c "; Specifie specific heat capacity of = = [Take, ii. 0.4Jg C".] Specific heat capacity ofcopper = of an electromagnet current flowing in the coil (a) The direction of at its two ends X and Y shown below End X End Y I. What is the polarity ofend XX? Y? II. What is the polarity of end a bar magnet and an electromagnet. between differences (b) Write the used of permanent magnet. (c) Write some of the important ? (d) What is the overloading Page No. 5 are as
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