State whether the following statements are true or false: 1. A wire with a green insulation is usually the live wire. 2. A miniature circuit breaker (MCB) works on the heating effect of current.

State whether the following statements are true or false: 1. A wi…

The elements are arranged in such a way that …… are on left side of zig-zag line and …….. on the right side.

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Name the non-metal which is used:
In the vulcanisation of rubber.

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Name one natural source of each of the following acids:

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Name two metals which occur in nature in free state as well as in combined state.

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Three elements having a single electron in their outermost shell.

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How is the refractive index of a material related to the speed of light in it?

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What information do we get about sunlight from the formation of a rainbow?

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What do kidneys excrete?

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Which instrument is used to measure electric current? How should it be connected in a circuit?

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Name the hydrocarbon formed when ethanol is heated with cone. $H_2SO_4$ at $170^\circ\ C$ ? What is this reaction known as?

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