1. The unit of e.m.f . is

a) Joule

b) Joule-Coulomb

c) Volt–Coulomb

d) Joule/Coulomb

Explanation: Unit of e.m.f. = volt = joule/coulomb

2. Which of the following is not the unit of time

a) Micro second

b) Leap year

c) Lunar months

d) Parallactic second

Explanation: Parallactic second

3. Unit of self inductance is

a) \[\frac{Newton-second}{Coulomb\times Ampere}\]

b) \[\frac{Joule/Coul omb\times Second}{Ampere}\]

c) \[\frac{Volt\times metre}{Coulomb}\]

d) \[\frac{Newton\times metre}{Ampere}\]

Explanation: \[\frac{Joule/Coul omb\times Second}{Ampere}\]

4. To determine the Young's modulus of a wire, the formula is \[Y=\frac{F}{A}\times\frac{L}{\triangle L}\] where L = length, A= area of cross-section of the wire, \[\triangle L\] = change in length
of the wire when stretched with a force F . The conversion factor to change it from CGS to MKS system is

a) 1

b) 10

c) 0.1

d) 0.01

Explanation:

5. Young's modulus of a material has the same units as

a) Pressure

b) Strain

c) Compressibility

d) Force

Explanation:

6. One yard in SI units is equal

a) 1.9144 metre

b) 0.9144 metre

c) 0.09144 kilometre

d) 1.0936 kilometre

Explanation: 1 yard = 36 inches = 36 * 2.54 cm = 0.9144 m

7. Which of the following is smallest unit

a) Millimetre

b) Angstrom

c) Fermi

d) Metre

Explanation: 1 fermi = 10

^{-15}metre

8. Which one of the following pairs of quantities and their units is a proper match

a) Electric field –Coulomb /m

b) Magnetic flux – Weber

c) Power – Farad

d) Capacitance – Henry

Explanation: Magnetic flux – Weber

9. The units of modulus of rigidity are

a) \[N-m\]

b) \[N\diagup m\]

c) \[N-m^{2}\]

d) \[N\diagup m^{2}\]

Explanation: \[N\diagup m^{2}\]

10. The unit of absolute permittivity is

a) Fm (Farad-meter)

b) \[Fm^{-1}\left(Farad/meter\right)\]

c) F (Farad)

d) None of these

Explanation: \[Fm^{-1}\left(Farad/meter\right)\]