# HOW MUCH DOES IT VARY?

## Quiz by Rosalyn Baring

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- Q1
_________ proportionality wherein one quantity directly varies with respect to a change in another quantity.

Users enter free textType an Answer10s - Q2
Select the correct one for direct variation.

y = kx

k = $\backslash frac\{x\}\{y\}$

yx = k

y = $\backslash frac\{k\}\{x\}$

5s - Q3
**Direct variation**is not a linear relationship hence, the graph will be a straight line.falsetrueTrue or False5s - Q4
The graph of a direct variation is a rectangular hyperbola.

falsetrueTrue or False5s - Q5
Two quantities are said to follow a direct variation if one increases and the other decreases by the same factor.

falsetrueTrue or False5s - Q6
C = πd. This formula an example of a direct variation.

truefalseTrue or False5s - Q7
The quantity of Iron boxes made is directly proportional to the number of iron blocks. The number of iron blocks needed for 40 boxes is 160. How many iron blocks are needed for a box?

Thus 2 iron blocks are needed for a box.

Thus 4 iron blocks are needed for a box.

Thus 20 iron blocks are needed for a box.

Thus 8 iron blocks are needed for a box.

20s - Q8
Let us assume that y varies directly with x, and y = 30 when x = 6. What is the value of y when x = 100?

Therefore the value of y when x = 100 is 5000.

Therefore the value of y when x = 100 is 500.

Therefore the value of y when x = 100 is 500.

Therefore the value of y when x = 100 is 50.

20s - Q9
If x = 10 and y = 20 follow a direct variation then find the constant of proportionality.

2

5

$\backslash frac\{2\}\{5\}$

$\backslash frac\{1\}\{2\}$

20s - Q10
Let x and y be in direct variation, x = 6 and y = 21. Then find the direct variation equation.

The direct variation equation is y = $\backslash frac\{5\}\{2\}$

The direct variation equation is y = 3

The direct variation equation is y = $\backslash frac\{7\}\{2\}$

The direct variation equation is y = $\backslash frac\{3\}\{2\}$

20s - Q11
Which of the given graphs is a direct variation?

C

D

B

A

10s - Q12
Given a direct variation where y=2x. What will be the coefficient of b in the formula, y=mx+b?

$\backslash frac\{1\}\{2\}$

1

0

2

10s - Q1310s
- Q14
If the number of books is y, and cost of books is x, what would be the constant ?

1/x

y/x

1/y

x/y

10s - Q15
if 1 book costs 30 Rs, how much will it cost for 2 books?

44230

50

44226

60

10s