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Physics with Akhtiar Ali Bullo
  • 2 years ago
Fan works on the principle of
Pankha kis principle pe kaam karta hai
EMI mcqs
Physics class 12th mcqs

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Find the current in a long straight wire that would produce a magnetic field twice the strength of the Earth's at a distance of 5.0 cm from the wire.Magnetic field of Earth= 5.0×10^-5 T
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A moving coil galvanometer has resistance of 50 ohms and it gives full scale deflection at 4 mA current. A voltmeter is made using this galvanometer and a 5 kilo ohm resistance. Calculate the maximum voltage that can be measured using this voltmeter
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A solenoid has length L=1.23m and inner diameter d=3.55cm and it carries a current I=5.57A.It consists of five close packed layers, each with 850 turns along length L.What is B at its center ?
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A wire 1.80m long carries a current of 13.0A and makes an angle of 35.0⁰ with a uniform magnetic field of magnitude B=1.50T.Calculate the magnetic force on the wire
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The poles of a horse shoe magnet measures 8cm × 3.2cm the magnetic flux density between the magnet poles is 80mT.Outside of the magnet the magnetic flux density is zero.Calculate the magnetic flux between the poles of a magnet.
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An aluminum window has a width of 60cm and length of 85cm as shown in the figure. a.When the window is closed the magnetic flux density is 1.8×10^-4 T is normal to window. b.Calculate the magnetic flux through the window.
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A carnot engine absorbs 52kJ as heat and exhaust 36kJ as heat in each cycle. Calculate: (a) The engine efficiency (b) The work done per cycle in kilojoules
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A carnot engine operates between the temperatures 850K and 300K.the engine performs 1200J of work in each cycle, which takes 0.25 sec (a) What is the efficiency of this engine ? (b) What is the average power of this engine ? (c) How much energy is extra
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A heat engine performs work of 0.4166 watts in one hour and rejects 4500J of heat to the sink.What is the efficiency of engine ?
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A heat engine works at the rate of 500kW.The efficiency of the engine is 30%.Calculate the loss of heat per hour.
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Temperature difference between the surface water and bottom water in Manchester lake might be 5 degree centigrade Assuming the surface water to be at 20 degree celsius.What highest efficiency a steam engine could have if it operates between these two tem
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In a high pressure steam turbine engine, the steam is heated to 600 degree centigrade and exhausted at about 90 degree centigrade.what is the highest possible efficiency of any engine that operates between these two temperatures?
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One kilogram of ice at 0 degree centigrade is melted and converted to water at 0 degree celsius.Compute its change in entropy.
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A carnot engine takes 2000J of heat from a reservoir at 500K does some work and discards some heat to a reservoir at 350K.How much heat is discarded,how much work does the engine do and what is the efficiency ? Physics class 12 numericals
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How much heat is required to raise the temperature of 1kg of lead from 25⁰C to 100⁰C.Specific heat capacity of lead=0.128 J/g⁰C Physics class 12 numericals solution Inter class physics numerical solution First law of thermodynamics numericals
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A 50 g piece of copper at 100 degrees centigrade is placed in 200 g of water at 20 degree celsius.If the final temperature of the system is 30 degree centigrade.Calculate the specific heat capacity of copper.(Specific heat capacity of water=4.18 J/g⁰C) Ph
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A gas expands from 0.03 m³ to 0.06m³ against a constant pressure of 100kPa.Calculate the work done in both a reversible and an irreversible process and compare the results
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During an isochoric process,the internal energy of a gas increases by 300J.If no work is done,determine the heat added to the system
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