Sure, let's go through each question step-by-step.
1. Which of the following is not a unit of force?
- (a) newton
- (b) dyne
- (c) newton-metre
- (e) gram-force
Answer: (c) newton-metre.
Explanation: Newton and dyne are units of force, while newton-metre is a unit of torque (moment of force), and gram-force is also a unit of force.
2. Which of the following is correct formula for moment of force?
- (a) [tex]\( F \times d \)[/tex]
- (b) [tex]\( \frac{F}{d} \)[/tex]
- (c) [tex]\( \frac{d}{F} \)[/tex]
- (d) [tex]\( F \times d^2 \)[/tex]
Answer: (a) [tex]\( F \times d \)[/tex].
Explanation: The moment of force (torque) is the product of the force applied and the perpendicular distance from the point of application to the pivot.
3. Which of the following is the correct relation between pressure and thrust?
- (a) Pressure [tex]\(= \text{Thrust} \times \text{Area} \)[/tex]
- (b) Pressure [tex]\(= \text{Thrust} \times (\text{area})^2 \)[/tex]
- (c) Pressure [tex]\(=\frac{\text { Thrust }}{\text { Area }}\)[/tex]
- (d) Pressure [tex]\(= \text{Thrust} \)[/tex]
Answer: (c) Pressure [tex]\(=\frac{\text { Thrust }}{\text { Area }}\)[/tex].
Explanation: Pressure is defined as force (thrust) divided by the area over which the force is applied.
4. Which of the following is used to measure liquid pressure?
- (a) Hydrometer
- (b) Barometer
- (c) Manometer
- (d) Pycnometer
Answer: (c) Manometer.
Explanation: A manometer is specifically designed to measure the pressure of liquids and gases. A barometer measures atmospheric pressure, a hydrometer measures the specific gravity (density) of liquids, and a pycnometer measures the density of a liquid.
5. How does the liquid pressure depend on the depth of the liquid?
- (a) Directly proportional
- (b) Inversely proportional
- (c) Independent
- (d) Varies from liquid to liquid
Answer: (a) Directly proportional.
Explanation: Liquid pressure increases linearly with the depth of the liquid. This relationship is expressed in the equation [tex]\( P = h \times \rho \times g \)[/tex], where [tex]\( P \)[/tex] is the pressure, [tex]\( h \)[/tex] is the depth, [tex]\( \rho \)[/tex] is the density of the liquid, and [tex]\( g \)[/tex] is the acceleration due to gravity.
In summary:
1. (c)
2. (a)
3. (c)
4. (c)
5. (a)
