Suresh wants to add a switch so that he can switch on and off both bulbs at the same time. at which position should the switch be placed? (science)

(1) A

Explanation:

The switch should be placed at A as it is the point which connects the wire to both bulbs.

Hope it helps u ...

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance