Which of the following is not represented in correct unit  

1. $\frac{\text{Stress}}{\text{Strain}}=N\text{}/\text{}{m}^2$

2. Surface tension = $N\text{}/\text{}m$

3. Energy $=kg\text{-}m\text{}/\text{}\sec$

4. Pressure $=N\text{}/\text{}{m}^2$

One second is equal to :

1. 1650763.73 time periods of $Kr$ clock

2. 652189.63 time periods of $Kr$ clock

3. 1650763.73 time periods of $Cs$ clock

4. 9192631770 time periods of $Cs$ clock

One nanometre is equal to:

1. ${10}^{9}mm$

2. ${10}^{-6}cm$

3. ${10}^{-7}cm$

4. ${10}^{-9}cm$

A micron is related to centimetre as

1. $1micron={10}^{-8}cm$

2. $1micron={10}^{-6}cm$

3. $1micron={10}^{-5}cm$

4. $1micron={10}^{-4}cm$

The unit of power is :

1. Joule

2. Joule per second only

3. Joule per second and watt both

4. Only watt

A suitable unit for gravitational constant is:

1. $kg\text{-\hspace{0.17em}}m{\sec }^{-1}$

2. $N{m}^{-1}\sec$

3. $N{m}^{2}k{g}^{-2}$

4. $kgm{\sec }^{-1}$

SI unit of pressure is

1. Pascal

2. $Dynes/c{m}^2$

3. cm of Hg

4. Atmosphere

The unit of angular acceleration in the SI system is 

1. $Nk{g}^{-1}$

2. $m{s}^{-2}$

3. $rad{s}^{-2}$

4. $mk{g}^{-1}K$

The unit of Stefan's constant $\sigma$ is : [This question includes concepts from Thermal Properties of Matter chapter]

1. $W{m}^{-2}{K}^{-1}$

2. $W{m}^2{K}^{-4}$

3. $W{m}^{-2}{K}^{-4}$

4. $W{m}^{-2}{K}^4$