Question

Activity-3 : For three days note down the distance covered by your father/mother's vehicle and note
down the fuel consumed and distance covered.
(i) Find out which kind of variation it shows. (Direct or Inverse)
(ii) Name the fuel used in the vehicle
(iii) Name a clean fuel.
(iv) Two health hazzards of pollution

Answer 1

(i) We know that more is the number of workers to do a job, less is the time taken to finish the job.

So, it is a case of inverse proportion.

(ii) Considering uniform speed, as the distance to be travelled increases, the time taken to cover it will also increase.

So, this is a case of direct variation.

(iii) Clearly, more is the area of cultivated land, more is the crop harvested.

So, it is a case of direct proportion.

(iv) We know that the more will be the speed of the vehicle, the distance will be covered in lesser time.

So, it is a case of inverse proportion.

(v) Clearly, more is the population, less is the area of land per person in a country.

So, it is a case of inverse proportion

Answer 2

Answer:

not good

do practise

For three days note down the distance covered by your father/mother's vehicle and note down the fuel consumed and distance covered.

(i) Find out which kind of variation it shows. (Direct or Inverse)

(ii) Name the fuel used in the vehicle.