Ques no 1

Ques no 1 2 _ An electric heater Of resistance 8 Ohms draws IS A from the service mains 2 hours. Calculate the rate at Which heat is &veloped the heater. 3. Should the resistance Of an ammeter be IOW or high? Give reasons. 4. HOW use Of a fuse Wire protect electrical 5. Why is parallel arrangement used in domestic Wiring? 6. TWO Wires Of equal lengths, one Of and Other Of mangnin (an alloy), have the same thickness. Which one Will be used for its i) electrical transmission ii) electrical heating devices? 7 _ metallic Wires A and B Of same material are connected in parallel. Wire A has length I and radius Wire b has length 21 and radius 2r_ Calculate ratio Of equivalent resistance m parallel combination and resistance Of Wire A. 8. On What factors reststalk•e Of a depends? 9 _ You are given three resistors Of 10 Ohms and 20 Ohms. a battery Of 2 S V a key, an ammeter and a volttneter_ Draw a Circuit diagram the Connections Of all given components such that the voltmeter gives a Of 2.0 VOIL 10_ HOW Can three resistors Of resistances 2 Ohms, 3 Ohms S Ohms connected to get a total resistance Of a) 3.875 Ohms b) 0 9 Ohms? I I State and define unit Of Current. 12 _ Name a source Of 13. Define one Watt hour. 14 _ A copper Wire has diameter Of 0.5 mm and resistivity Of I _6XlOS m. What Will be the length Of this Wire to make a 10 Ohms coil? 15. Among silver and copper, Which one is a tætter conductor" Why? WORKSHEET 2 (MAGNETIC EFFECTS OF ELECTRIC CURRENT) I Why does a compass needle get deflected When brought near a bar magnet? 2 _ Why two magnetic lines Of forces don't intersect each Other? 3. The magnetic field in a given region is uniform Draw a diagram to it _ 4. It is established that an electric Current through a metallic conductor prodLRes a magnetic field around it IS there a magnetic field around a thin beam Of moving i) particles. ii) neutrons. Justify your 5. With the Of a labelled Circuit diagram illustrate the pattern Of field lines Of the magnetic field around a Current Carrying Straight long conducting Wire. HOW is right hand thumb rule useful to find direction Of magnetic field With a Current carrying 6. Explain With the help Of a labelled diagram the distribution Of a magnetic field due to a Current through circular loop Why is it that if a Current carrying coil has n the field produced at any point is n tittles as large that by a Single turn 9 7 _ Why is pure iron not used for making magnets? 8. Explain With diagram, the principle, construction and working Of an electric 9 _ TWO Circular conductors A and B are perpendicular to each Other. IS the Current induced in the O ther ? I O _ What is the advantage Of solenoid o Ver an ordinary coil? CHEMISTRY W o rksheet-l QI What are the characteristics of chemical reactions? 02 •we need balance a chemical equation' Justify. Q3 Write the chemical equation of the reaction in which the following changes have taken place with an example of each: a) Charwe in Color. b) Cha rwe in t rature_ For mation Of