Multiple Choices: Directions: Encircle the letter of your choice;
1. The cost c varies directly as the number n of pencils is written as
a. C = kn
b. k=cn
c. n = k/c
d. c= k/n
2.
The speed r of a moving object in inversely proportional to the time t travelled is written as
a. r= kt
b. r= k/t
c. t = kr
d. r/k=t
3. Which is an example, of a direct variation?
a. xy = 10 b. y = 2/x
c. y = 5x
d. 2ly = x
4. A car travels a distance of d km in t hours. The formula that relates d tot is d = kt. What kind of variation is
it? a. direct
b. inverse
c. joint
d. combined
5. y varies directly as x and y = 32 when x = 4. Find the constant of variation.
a. 8
b. 36 C. 28
d. 128
6. What happens to T when is doubled in the equation T = 4h?
a. T is halved
b. T is tripled
c. T is doubled d. T becomes zero
7. If y varies directly as x and y = 12 when x = 4, find y when x = 12
a. 3
b. 4
c. 36
d. 48
a. lw = 36 b. l/w = 36
c. 1/36 = w
d. w/36 = 1
8. If y varies inversely as x and y = 1/3 when x = 8, find y when x = -4
a. -2/3
b. 2/3 C.-32/3
d. 32/3
9. What happens to y when x is tripled in the relation y = k/x?
ay is tripled b. y is doubled
cy is halved
d. y is divided by 3
10. w varies directly as the square of x and inversely as p and q. If w = 12 when x = 4, p =2 and q = 20, find w
when x = 3, p = 8 and q = 5
a. 10
b. 9
c. 2714
d. 5
11. If 3 men can do a portion of a job in 8 days, how many men can do the same job in 6 days?
b. 6
c. 5
d. 4
12. If y varies directly as x and y = 1/5 when x = 9, find y when x = -3
a. 5
b. 1/3
c.3/5
13. Mackee's income varies directly as the number of days that she works. If she earns P8,000.00 in 20 days,
d. -3/5
how much will she earn if she worked 3 times as long?
a. P26,000.00
b. P24,000.00
14. If s varies inversely as v, then which of the following equations describes the relation among the three
c. P20,000.00
d. P16,000.00
variables s, t, and v?
a. s = k/w
b. s = ky/t
15. Jaimee's income varies directly as the number of days that she works. If she earns P12,000 in 20 days, how much will she earn if she works twice as long?
A.P26,000.00
B.P25,000.00
C.P20,000.00
D.P16,000.00​