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ST. XAVIER'S COLLEGIATE SCHOOL, 30 MOTHER TERESA SARANI, KOLKATA-16 Date:16/08/2024 Class:X FIRST SEMESTER BLOCK TEST Full Marks: 80 Duration: Two hours PHYSICS [40MARKS] SECTION-A [Compulsory Section] [15x1=15] Question l Choose the correct option. a. b. cm from the pivot. The moment of force is: a body is pivoted and a force of 20N isapplied at distance of 60 iv. 120 Ncm iji. 12 Nm i. 12 Ncm ii. 1200 Ncm not depend A ray of light suffers refraction through an equilateral prism. The deviation produced by the prism does A on the: iii. Material of prism iv. Size of prism Angle of incidence ii. Colour of light i. C. A magnified erect image is obtained when an object is positioned in front of a converging lens. The distance of the object from the lens would be: iii. Between one and two focal lengths Equai to one focal length ii. Equal to twice the focal length i. iv. Less than one focal length d. One of the common property of electromagnetic radiations is: of them are deflected by electric and magnetic fields ii. None of them are deflected by electric and magnetic fields iii. Allof them are deflected byelectric fields but none by magnetic fields iv. All of them are deflected by magnetic fields but none by electric fields i. All e. For the given cooling curve, the latent heat is D released in which stages: EF and FG f. A device based on the conversion of light energy to electrical energy is: i. i. Dynamo ii. Motor g. The resistance that must be connected toa15 i. 2 -iii. Photocell resistor to produce an effective resistance iii. ii. 62 92 h. The power i i. ii. DE and EF CD and FG of a 102 iv. DE and FG iv. Camera of 6s2 is: iv. 72 iv, - 10D convex lens of focal length 10cm is: i. +1D ii. - ID iii. +1OD P and O of different metals have their masses in the rati of 3:2 are given same amount of heat.Their temperature rises by same amount. The ratio of their specific heat capacities are: i. Two biocks i. 3:2 ii. 9:4 ii. 2:3 iv, 1:27 j. Of the three connecting wires in a household circuit which two wires are at the same potential: .iii. earth and neutral iv. earth and fuse i. Live and neutral wire ii. neutral and fuse k. The critical angle for glass-air is 45 for yellow colour. Which of the following colour of light will have critical angle more than 450. i. Blue ii. Green iii. Indigo N. Red I. Inside a current carrying solenoid the magnetic lines of force are: i.Circular and do not intersect ii. Along the axis of the solenoid and are parallel to each other iii. Perpendicular to the axis of the solenoid iv. None of these m. Ihe power rating of an electrical appliance is 200W-220V. If this appliance is connected to supply, then the power consumption will be: i. 50W ii. 100WV iii. 150W ii. 160 cm o. The terminal voltage a of cell in an open circuit condition is: i. Less than EMF power is: iv, 240 cm iii. More than EMF iv. Depends on the internal resistance ii. Equal to EMF Question iii. 180 cm l6t* iv, Remains the same n. A wire of length 80 cm has resistance 3.5). The length of a similar wire of resistance 10.52 i. 120 cm a of the cell 2 i. What is the internal resistance of a cell? How does it depend on (a) surface area of electrodes (b) distance between the electrodes? ii. State one similarity and one dissimilarity between X rays and y rays. A type of single pulley is very often used as a machine even ii. though it does not give any gain in mechanical advantage. a. Name the type of pulley in question b. For what purpOse is such a pulley used? iv. List two advantages of connecting household appliances in parallel. v. How much boiling water at 100 Cis needed to melt 2kg of ice so that the mixture which is all water is at 0 C? vi. The diagram shows a coil wound around a U shaped soft iron bar AB.: a. What is the polarity induced at the end A and B when the switch is closed? b. Suggest one way to strengthen the magnetic field in the electromagnet. vii. A ray of light is passing from one transparent medium to another having a different refractive index Name the quantity which does not remain constant in the above case. b. Under what condition in the above case the ray will enter other medium without suffering deviation? Question [3+2+2+2+2+2+2] 3 i. A transformer is used to change a low alternating EMF to a high alternating EMF of same frequency. a. Identify the transformer used for the above case. b. State whether the turns ratio of theabove transformer is =1, <l or>1. ii. Calculate the resultant moment of forces A and B about the point A. (Refer to the figure below) (2] [2) ii. Define radioactivity. How is the radioactivity affected if the substance is oxidized? in iv. Two resistors R1 and R2 are connected first in series and then in parallel. Show the equivalent resistance [21 each case in the same V-I graph. [21 water. V. Give reason: Drinks get cooled more quickly by adding pieces of ice than ice-cold SECTION-B. [40 MARKS] [Answer any four questions] auestion 4 A i. is hung at 90 cm is kept balanced when a load of36 gf cm ruler The mark. at 65 uniformmetre rule is pivoted mark. a. Draw the diagram for this arrangement. b. Calculate the weight of the metre rule. final temperature of water after mass 90 g is dropped into 360 of water at 60 C. Calculate the ii. A piece of ice of water =4200J/kg C] fusion of ice=336J/g: Specific heat capacity of allthe ice has melted. [Specific latent heat of power of the a vertical height of 10m in I minute. Calculate the through water kg pump 600 raises of water a. iii. A electric pump. [Take g= 9.8nm/s') [3+3+4] note. b. Give two points of difference between noise and musical Question 5 a ray is 60 for a rectangular transparent glass block, when The angle of incidencc is 45 and angle of refraction emerges into air from it. Calculate: a. the refractive index of the slab. b. the magnitude of angle of emergence. an efficiency of 90%. Calculate: 4 ii. A pulley system has a velocity ratio of and i. ii. a. the MA of the machine system. b. The effort required to raise a load of 720N by the a conductor. a a. What do you understand by a non-Ohmic conductor? Draw graph for such a of R.I. 1.5. Comment on the optical behavior b. A convex lens of R.I. 1.5 is immersed in liquid liquid system. of this lens [3+3+4] Question6 are used: State the purpose for which the following rules a. Right hand thumb rule. b. Fleming's left hand rule. c. Fleming's right hand rule. to a 250V line mains. Find the following: ii. An electric geyser is rated 1500W, 250Vis connected i. drawn by it. b. The energy consumed by it in 50 hours. c. The cost of energy consumed if each unit costs Rs. 6.00 are connected in parallel. The combination of the above resistors is iii. Three resistors of 32, 1.52 and 12 a EMF 4.5V. If the internal resistance of the cell is connected in series to a resistance of 8.02 and then to battery of negligible then: a. Drawa neat circuit diagram b. Calculate the current in the main circuit. c. The p.d. across 8.0 S2 resistor [3+3+4] d. The current flowing through the 32 resistor. a. Current Question 7 Calculate the p.d.at the ends ofa power source, which supplies current to a 42 resistance wire for 20 minutes and raises the temperature of 400 g of water by 20 C. [Specific heat capacity of water=4200J/kg C] ii. a. State the class of lever and relative positions of Load(L), Effort(E) and Fulcrum (F) in a bottle opener and a sugar tong. b. Why is less effort needed to lift a load over an inclined plane as compared to lifting it directly? i a. Define critical angle. How is it related to refractive index of the medium? b. You are provided with a printed piece of paper. Using this paper how will you differentiate between a convex [3+3+4] and a concave lens. ii. Question 8 man standing in a valley between two large cliffs gives a short sharp shout. He hears 2 echoes. The first after ls and the next after 1.5s. The speed of sound is 340m/s. Calculate: a. The distance of the man from each cliff. b. The distance between the cliffs. ii. Refer to the diagram below and describe your observations: a. when the magmet is rapidly moved in the direction of the arrOW. b. The magnet is stopped within the coil. c. The magnet is pulled out rapidly. A i. B a. A transformer lowers EMF from 240V. If the ratio of number of turns in primary is to secondary coil is 40:1, find the EMF produced in the secondary coil. ii. b. Write two precautions in handling radioactive substances. Question (3+3+4] 9 i. Give three characteristics of image formed by concave lens. ii. It is required to raise the temperature of 8.4 kg of water from 30 C to 80 C. What mass of steam at 100 C when passed through this mass of water will bring about this amount of temperature increase? [Specific heat capacity of water=4.2Jig C, Specific latent heat of vaporization of water- 2268J/g] a. For two given bodies A and B having equal masses, the velocity of A is doubled while that of B is halved. Find the ratio of their new kinetic energies. ii. b. Why are danger signs coloured in red? (3+3+4]
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