11. 

0.04 x 0.0162 is equal to:

A. 6.48 x 10-3
B. 6.48 x 10 -4
C. 6.48 x 10 -5
D. 6.48 x 10 -6

12. 

4.2 x 4.2 - 1.9 x 1.9 is equal to:
2.3 x 6.1

A. 0.5
B. 1.0
C. 20
D. 22

13. 

If 144 = 14.4 , then the value of x is:
0.144 x

A. 0.0144
B. 1.44
C. 14.4
D. 144

14. 

The price of commodity X increases by 40 paise every year, while the price of commodity Y increases by 15 paise every year. If in 2001, the price of commodity X was Rs. 4.20 and that of Y was Rs. 6.30, in which year commodity X will cost 40 paise more than the commodity Y ?

A. 2010
B. 2011
C. 2012
D. 2013

15. 

Which of the following are in descending order of their value ?

A.
1 , 2 , 3 , 4 , 5 , 6
3 5 7 5 6 7
B.
1 , 2 , 3 , 4 , 5 , 6
3 5 5 7 6 7
C.
1 , 2 , 3 , 4 , 5 , 6
3 5 5 6 7 7
D.
6 , 5 , 4 , 3 , 2 , 1
7 6 5 7 5 3