11. 

If log 2 = 0.30103, the number of digits in 264 is:

A. 18
B.

19

C.

20

D.

21


12. 

If logx 9 = - 1 , then x is equal to:
16 2

A.
- 3
4
B.
3
4
C.
81
256
D.
256
81

13. 

If ax = by, then:

A.
log a = x
b y
B.
log a = x
log b y
C.
log a = y
log b x
D. None of these

14. 

If logx y = 100 and log2 x = 10, then the value of y is:

A. 210
B.

2100

C.

21000

D.

210000


15. 

The value of log2 16 is:

A.
1
8
B.

4

C.

8

D.

16