Which of the following is not a unit of time?

1. Second

2. Hour

3. Year

4. Light year

Which of the following measurements is the most precise?

1. 5.00 mm

2. 5.00 cm

3. 5.00 m

4. 5.00 km

Which of the following ratios express pressure?

1. Force/Volume

2. Energy/Volume

3. Energy/Area

4. Force/length

Which of the following does not have the dimensions of force?

1. Potential gradient

2. Energy gradient

3. Weight

4. Rate of change of momentum

Dimensional analysis cannot be used for:

1. deriving relations

2. deriving relation with four unknown variables

3. converting system of units

4. checking correctness of relations

The number of significant figures in 0.06900 is:

1. 5

2. 4

3. 2

4. 3

The sum of the numbers \(436.32,227.2,\) and \(0.301\) in the appropriate significant figures is:

The mass and volume of a body are \(4.237~\mathrm{g}\) and \(2.5~\mathrm{cm^3}\), respectively. The density of the material of the body in correct significant figures will be:
1. \(1.6048~\mathrm{g~cm^{-3}}\)
2. \(1.69~\mathrm{g~cm^{-3}}\)
3. \(1.7~\mathrm{g~cm^{-3}}\)
4. \(1.695~\mathrm{g~cm^{-3}}\)

The numbers \(2.745\) and \(2.735\) on rounding off to \(3\) significant figures will give respectively, 

The length and breadth of a rectangular sheet are 16.2 cm and 10.1 cm, respectively. The area of the sheet in appropriate significant figures and error would be, respectively,
1. 164 $\pm$ 3 ${\mathrm{cm}}^2$
2. 163.62 $\pm$ 2.6 ${\mathrm{cm}}^2$ 
3. 163.6 $\pm$ 2.6 ${\mathrm{cm}}^2$ 
4. 163.62 $\pm$ 3 ${\mathrm{cm}}^2$