State True or False. If false correct it.

(1) The SI unit of charge is volt.

(2) Voltmeter is always connected in series with the device.

(3) The conventional direction of flow of current is from positive terminal to negative terminal of the cell.

(4) Silver and copper are good conductors.

(5) Resistivity of pure metal is more than alloys.

(6) The electric bulb consists of the filament whose melting point is low.

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Solution

(1) False

Correct statement: The SI unit of charge is Coulomb(C).

(2) False

Correct statement: The voltmeter is always connected in parallel with the device. This is because it is used to measure the potential difference across two points in a circuit and we know that in a parallel connection the voltage in the branches remains same. Also the resistance of the voltmeter is very high due to which a very small current flows through the voltmeter. Therefore, it is connected in parallel to measure the voltage.

(3) True

(4) True

(5) False

Correct statement: Resistivity of pure metal is less than alloys. An alloy is a combination of metals usually made to enhance certain properties such as strength, ductility and resistance. This means that alloys have a higher resistivity than metals. They do not allow electric current to pass easily and they have low electrical conductivity.

(6) False

Correct statement: The electric bulb consists of the filament whose melting point is high. This is because it becomes very hot to emit light.

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