Question

School bags are provided with broad strips to _________.

• A. increase the pressure
• B. minimise the pressure
• C. increase the force
• D. minimise the thrust

Answer 1

The correct option is B

minimise the pressure

The explanation for the correct answer:

Option B

1. School bags are provided with broad strips to minimize the pressure.
2. As pressure is given as, $\mathrm{Pressure}=\frac{\mathrm{Thrust}}{\mathrm{Area}}$
3. More the area less is the pressure exerted by the strips on the shoulders.

The explanation for the incorrect answer:

Option A

1. As the pressure is inversely proportional to the area i.e., more the area less is the pressure, and vice versa.
2. Therefore, school bags are provided with broad strips to minimize the pressure not to maximize the pressure.
3. Hence this option i.e., maximizing the pressure is incorrect.

The explanation for the incorrect answer:

Option C

1. The force depends on the mass of the bag and acceleration due to gravity i.e., F = mg.
2. In other words, force depends on the weight of the bag.
3. Thus, school bags with broad strips does not increase the force and hence this option is incorrect.

The explanation for the incorrect answer:

Option D

1. The thrust i.e., the force acting normal on the surface depends on the mass of the bag and acceleration due to gravity i.e F = mg.
2. In other words, force depends on the weight of the bag.
3. Hence, school bags with broad strips does not minimize the thrust and hence this option is incorrect.

Conclusion:

Therefore, option (B) is the correct option.