Oral work :
Why should the experiments of static electricity be performed in dry air?

Oral work : Why is displacement a vector quantity ?

Give scientific reasons for the following: Experiments on static electricity are not successful during rainy season.

Oral work : When do we say that asn object is electrically neutral?

Answer the following orally What happens if we perform experiments of frictional electricity or static electricity during rainy season ?

Oral work : Why is water known as the universal solvent ?

Oral work : Which device is used to detect the electric charge on an object?

You have learnt about static electricity in the previous standard . Electrostatic force is a non contact force . To verify this , which experiment will you perform ?

In Milikan's experiment, static electric charge on the oil drops has been obtained by shining X-rays. If the static electric charge on the oil drop is -1.282 xx 10^-18 C, Calculate the number of electrons present on it.

Oral work : Find the value ,unit and the physical quantity expressed in a sentence given below . One should drink two litres of water every day .

Assertion: The length of the glass tube in air column resonating experiment is 75 cm. If velocity of sound in air is 330ms^(-1) , The experiment connot be performed with a tuning fork o frequency n=482 Hz. Reason: If l_(2)andl_(1) are first and second resonating lengths in air column resonating experiment, then velocity of sound V=2n(l_(2)-l_(1))