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Observe the figure and answer the following questions.
a) Identify the machine shown in figure.
b) Write a use of this machine.
c) How transformation of energy takes place in this machine.
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When heat energy is absorbed by object ΔT represents the raise in temperature. What would be ΔT represent if the object loses heat energy?
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Give scientific reason :
In the electric equipment producing heat e.g. iron, electric heater, boiler, toaster, etc., an alloy such as Nichrome is used, not pure metals.
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Write names of first four homologous series of alcohols.
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Answer the following question:
Grills of doors and windows are always painted before they are used? Give reason.
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Answer the following:
What is corrosion? Do gold ornaments corrode? Justify.
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Name any six domestic appliances based on the heating effect of electric current.
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Explain the construction and working of an electric generator (AC) with the help of a neat diagram.
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Rewrite the following statement by selecting the correct option:
1 A = ____________ mA.
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Answer the following question:
what is the heating effect of the electric current? state any four applications of it?
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Complete the correlation:
Alkene : C = C :: Alkyne: _______.
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State true or false:
The frequency of AC is 50 Hz.
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- Complete the given chemical reaction:
\[\ce{CuSO4_{(aq)} + Fe_{(s)} ->}\] _______ + _______ - Name the type of the reaction.
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The gravitational force between two bodies is directly proportional to the product of the masses of those bodies and is _______ of the distance between them.
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The value of universal gravitational constant (G) in the SI unit is ______.
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The _______ force is much weaker than other forces in nature.
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The ‘live’ and the ‘neutral’ wires have potential difference of _______.
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In an electric bulb, coil of _______ metal is used.
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The electricity bill specifies the usage in _______.
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These days when current in the circuit suddenly increases _______ switches are used.
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