**531. Steradian is the SI unit of________________?**

A. Plane angle

**B. Solid angle**

C. Both plane angle and solid angle

D. Neither plane angle nor solid angle

**532. An ideal standard of measurement of a base quantity has characteristics_______________?**

A. Accessible

B. Invariable

C. Transportable

**D. Only a and b are correct**

**533. Total uncertainty, in the result obtained from the subtraction of two measurements, is equal to_______________?**

**A. Sum of their absolute uncertainties**

B. The difference of their absolute uncertainties

C. The product of their absolute uncertainties

D. Division of their absolute uncertainties

**534. Which one is the highest power multiple ?**

**A. Giga**

B. Beta

C. Mega

D. Deca

**535. One pico stands for_________________?**

A. 10 raised to power -15

**B. 10 raised to power -12**

C. 10 raised to power -9

D. 10 raised to power -6

**536. Unit of G is ______________?**

A. Nm2Kg2

**B. Nm2Kg**

C. Nm2Kg-2

D. None

**537. The unit of force is _________ and its symbol is ______________ Which is the correct pair ?**

A. Newton, n

B. Newton, N

C. newton, n

**D. newton, N**

**538. How many main frontiers of fundamental science ?**

A. 1

B. 2

**C. 3**

D. 4

**539. One light year is equal to________________?**

**A. 9.5x1015m**

B. 9.5x1015sec

C. 9.5x1015Km

D. 9.5x1015cm

**540. Which one is the derived quantity in SI units _____________?**

A. Electric current

**B. Electric charge**

C. Plane angle

D. Amount of substance