## Units and Measurement Questions and Answers Part-10

1. Faraday is the unit of
a) Charge
b) emf
c) Mass
d) Energy

Explanation: 1 Faraday = 96500 coulomb

2. Candela is the unit of
a) Electric intensity
b) Luminous intensity
c) Sound intensity
d) none of these

Explanation: Candela is the unit of Luminous intensity

3. The unit of reactance is
a) Ohm
b) Volt
c) Mho
d) Newton

Explanation: The unit of reactance is Ohm

4. The unit of Planck's constant is
a) Joule
b) Joule/s
c) Joule/m
d) Joule-s

Explanation: Joule-s

5. Number of base SI units is
a) 4
b) 7
c) 3
d) 5

Explanation: Number of base SI units is 7

6. SI unit of permittivity is
a) $c^{2}m^{2}N^{-1}$
b) $c^{-1}m^{2}N^{-2}$
c) $c^{2}m^{2}N^{2}$
d) $c^{2}m^{-2}N^{-1}$

Explanation:

7. Which does not has the same unit as others
a) Watt-sec
b) Kilowatt-hour
c) eV
d) J-sec

Explanation: Joule-sec is the unit of angular momentum where as other units are of energy

8. Unit of surface tension is
a) $Nm^{-1}$
b) $Nm^{-2}$
c) $N^{2}m^{-1}$
d) $Nm^{-3}$

Explanation:

9. Which of the following system of units is not based on units of mass, length and time alone
a) SI
b) MKS
c) FPS
d) CGS

a) $Nm^{2}$
b) $Nm^{-2}$
d) $Nm^{-1}$
Explanation: $Nm^{-2}$