(i) Following model demonstrates the process of thermo-electric production.

i. Identify and label the device marked as
Ans. Device is dynamo

ii. A tennis ball fitted with sheets of metal is rotated. Explain the reason.
Ans. Tennis ball fitted with metal sheets Rotates due to the force exerted on it by the steam

iii. Name the device which relies on the principle demonstrated by this model.
Ans. Thermal power plant works on the principal demonstrated by the given model



< (iv.) The form of energy that is being converted into electrical energy. Make it clear
Ans. Machanical energy of tennis ball fitted with metal sheets is converted into electric energy

Q.2 scientists choose 1/16 of the mass of a naturally occurring oxygen atom as the atomic mass nit. Explain the reason.
Ans .At first mass of hydrogen was chosen to measure the relative masses of other elements because it is the lightest element and can compare with all. But later oxygen is chosen to calculate the relative mass of elements because oxygen is considered as more reactive than the hydrogen and it gives relative masses of other elements in the whole number which make it easier to calculate.

Next question updated soon please wait we work on it