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650 J of heat is required to raise the temp. of 0.25 kg of lead from 15°C to 35°C. Calculate the Sp. heat capacity of lead.
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State, with reason, which of the two, boiling water or steam both at 100°C will produce more severe burns.
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If 10125 J of heat energy boils off 4.5 g of water at 100°C to steam at 100°C, find the specific latent heat of steam.
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Fill in the following blank using suitable word:
SI unit of heat is .........
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Shows a lemon crusher. Name the class of lever.
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The diagram below shows a rod lifting a stone.
- Mark position of fulcrum F and draw arrows to show the directions of load L and effort E.
- What class of lever is the rod?
- Give one more example of the same class of lever stated in part (b).
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Complete the following sentence :
On reserving the direction of current in a wire, the magnetic field produced by it gets _____.
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State two factors on which the magnitude of an induced e.m.f. in the secondary coils of a transformer depends.
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The magnetic flux through a coil having 100 turns decreases from 5 milli weber to zero in 5 second. Calculate the e.m.f. induced in the coil.
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Specific heat capacity of a substance A is 3.8 J g-1 K-1 and of substance B is 0.4 J g-1 k-1. Which substance is a good conductor of heat? How did you arrive at your conclusion?
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A liquid X has specific heat capacity higher than the liquid Y. Which liquid is useful as coolant in car radiators.
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A liquid X has specific heat capacity higher than the liquid Y. Which liquid is useful as heat reservoir to keep juice bottles without freezing?
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A piece of iron of mass 2.0 kg has a heat capacity of 966 J K-1. Find its specific heat capacity in S.I unit.
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Water boils at 120 °C in a pressure cooker. Explain the reason.
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State two factors on which the strength of induced e. m.f. depends.
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Describe briefly one way of producing an induced current in a coil. State one factor that determines the magnitude of induced e.m.f.
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State the two properties of the magnetic lines of force around a circular coil.
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A straight wire is held vertical and current is passed in it in the upward direction. A compass needle is kept near the wire in north of it. How is the needle deflected? What is the change in the deflection of the needle if the current in wire is reversed?
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