Question 1 :
Both x and y are in direct proportion, then $\frac {1}{x}$ and $\frac {1}{y}$ are

Question 2 :
The perimeter of a circle and its diameter vary _______ with each other.

Question 3 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cc9af59b460d7261edab.PNG' /> Refer to the above figure. A water tank casts a shadow 21 m long. A tree of height 9.5 m casts a shadow 8 m long at the same time. The lengths of the shadows are directly proprotional to their heights. Find the height of the tank.

Question 4 :
Shabnam takes 20 minutes to reach her school if she goes at a speed of 6 km/h. If she wants to reach school in 24 minutes, what should be her speed?

Question 5 :
x and y are said to vary directly with each other if for some positive number k, ______ =k.

Question 6 :
A packet of sweets was distributed among 10 children and each of them received 4 sweets. If it is distributed among 8 children, how many sweets will each child get?

Question 7 :
Two quantities are said to vary ______ with each other if an increase in one causes a decrease in the other in such a manner that the product of their corresponding values remains constant.

Question 8 :
By travelling at a speed of 48 kilometres per hour, a car can finish a certain journey in 10 hours. To cover the same distance in 8 hours, the speed of the car should be

Question 9 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cc8ff59b460d7261ed9d.PNG' /> In the above figure, a table is shown. Determine if x and y are in direct proportion or not.

Question 10 :
If xy = 10, then x and y vary ______ with each other.