Question

16. When three resistors each of 3 ohms are connected in parallel. Their equivalent resistance will
be
A. 6 Ohms
B. 1 Ohms
C. 3Ohms
D. 9 Ohms

17. The number of pair of sex chromosomes in a human cell is
A. one
B. Two
C. Three
D. Four

18. The device used for producing electric current is called
A. Generator
B. Galvanometer
C. Motor
D. Ammeter

19. Which one of the following gets converted into seed after fertilization
A. Ovary
B. Style
C. Ovule
D. Egg

20. A molecule of ammonia has
A. Only single bonds
B. Only double bonds
C. Only triple bonds
D. Two double bond and one single bond

Answer 1

Answer:

16) D - 9 ohms

17) B - two

18)D - Ammeter

19)C - Ovule

20)A - Only single bonds

Explanation:

16) R = R1 + R2 + R3

= R + R + R

= 3R = 3 × 3 = 9 ohms