Home »
MCQs »
Fluid Mechanics MCQs
Fluid Mechanics MCQs - Properties of Fluid
Fluid Mechanics MCQs - Properties of Fluid: This section contains the multiple-choice questions and answers on the fluid mechanics chapter Properties of Fluid. practice these MCQs to learn and enhance the knowledge of Properties of Fluid.
1. Mass Density of a fluid is defined as ____.
- Ratio of mass of its fluid to its volume
- Ratio of weight of its fluid to its volume
- Ratio of the volume of its fluid to its mass
- Ratio of the volume of its fluid to weight
Answer: A) Ratio of mass of its fluid to its volume
Explanation:
The mass density of a fluid is defined as the mass of the fluid per unit volume. It represents how much mass is present in a given volume of the fluid. The symbol typically used to represent mass density is ρ (rho).
Discuss this question
2. SI unit of mass density is ____.
- (J/(kg·K))
- (Pa·s)
- (kg/m³)
- (m/s²)
Answer: C) (kg/m³)
Explanation:
Mass density represents how much mass is contained within a given volume of a substance. It is determined by dividing an object or substance's mass by volume. The resulting value indicates the concentration of mass within a specific amount of space. The SI unit of kilograms per cubic meter (kg/m³) is commonly used for mass density because it provides a standardized and consistent way to express the relationship between mass and volume.
Discuss this question
3. The Value of the Density of water is ____.
- 1kg/ m³
- 100 g/ m³
- 1000kg/ m³
- 10 g/ m³
Answer: C) 1000kg/ m³
Explanation:
The density of water is about 1000 kg/m3, or kilograms per cubic meter. This means that for every cubic meter of water, it has a mass of around 1000 kilograms. Water has a relatively high density, which is why objects tend to float or sink depending on their density compared to water.
Discuss this question
4. What is the SI unit of specific weight?
- Newton per cubic meter (N/m³)
- Pascal (Pa)
- Kilogram per cubic meter (kg/m³)
- Newton (N)
Answer: A) Newton per cubic meter (N/m³)
Explanation:
Specific weight is defined as the weight of a substance per unit volume. The SI unit of specific weight is Newton per cubic meter (N/m³). It represents the force exerted by the substance per unit volume.
Discuss this question
5. Specific weight is directly proportional to ____.
- Volume
- Mass
- Density
- Temperature
Answer: C) Density
Explanation:
Specific weight is directly proportional to the density of a substance. As density increases, the specific weight also increases because more mass is packed into a given volume.
Discuss this question
6. The specific weight of water at standard conditions is approximately ____.
- 1000 N/m³
- 9.8 N/m³
- 1 N/m³
- 9810 N/m³
Answer: A) 1000 N/m³
Explanation:
The specific weight of water at standard conditions is approximately 1000 Newton per cubic meter (N/m³). This means that for every cubic meter of water, it exerts a force of 1000 Newtons due to its weight.
Discuss this question
7. The mass of a gas is 2 kg, and its volume is 10 m³. Calculate the specific volume of the gas?
- 2 m³/kg
- 5 m³/kg
- 10 m³/kg
- 20 m³/kg
Answer: B) 5 m³/kg
Explanation:
Specific volume is calculated by dividing the volume by the mass. In this case, the volume is 10 m³ and the mass is 2 kg. Dividing the volume by the mass gives us a specific volume of 5 m³/kg.
Discuss this question
8. Which of the following substances is likely to have the highest specific volume?
- Iron
- Water
- Lead
- Gold
Answer: B) Water
Explanation:
Specific volume is inversely related to density. Substances with low density will have higher specific volumes. Among the options provided, water has a relatively low density compared to metals like iron, lead, and gold. Therefore, water is likely to have the highest specific volume.
Discuss this question
9. The SI unit of specific volume is ____.
- m/s
- kg/m
- m³/kg
- kg/m³
Answer: C) m³/kg
Explanation:
The specific volume is expressed in units of volume per unit mass. The SI unit for volume is cubic meter (m³), and the SI unit for mass is kilogram (kg). Therefore, the SI unit for a specific volume is m³/kg.
Discuss this question
10. What is a specific volume?
- The volume per unit area
- The volume per unit mass
- The volume per unit temperature
- The volume per unit pressure
Answer: B) The volume per unit mass
Explanation:
The volume occupied by a unit mass of a substance is known as its specific volume. It is calculated by dividing the volume (V) by the mass (m) of the substance. It is a useful property for understanding the density and compressibility of a substance.
Discuss this question
11. The specific gravity of a substance provides information about its ____.
- Volume
- Temperature
- Pressure
- Density
Answer: D) Density
Explanation:
Specific gravity is a measure of the density of a substance relative to the density of water.
Discuss this question
12. The specific gravity of a substance is inversely proportional to its ____.
- Mass
- Volume
- Density
- Temperature
Answer: C) Density
Explanation:
Specific gravity is the ratio of the densities of a substance and water, and therefore it is inversely proportional to the density of the substance.
Discuss this question
13. If a substance has a specific gravity greater than 1, it means that it will ____.
- Sink in water
- Float on water
- Be unaffected by water
- Change its state
Answer: A) Sink in water
Explanation:
If the specific gravity is more than one, the substance is denser than water and will sink in it.
Discuss this question
14. The specific gravity of air is approximately ____.
- 0
- 1
- 10
- 100
Answer: A) 0
Explanation:
Air is much less dense than water, resulting in a specific gravity close to 0.
Discuss this question
15. What is the specific gravity of a substance that has a density of 2,500 kg/m³?
- 0.25
- 2.5
- 25
- 250
Answer: C) 25
Explanation:
The specific gravity of a substance is computed by dividing its density by the density of water. In this case, 2,500 kg/m³ divided by 1000 kg/m³ (density of water) equals 25.
Discuss this question