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Test: Viscosity - SSC CGL MCQ


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15 Questions MCQ Test General Awareness for SSC CGL - Test: Viscosity

Test: Viscosity for SSC CGL 2024 is part of General Awareness for SSC CGL preparation. The Test: Viscosity questions and answers have been prepared according to the SSC CGL exam syllabus.The Test: Viscosity MCQs are made for SSC CGL 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Viscosity below.
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Test: Viscosity - Question 1

How does temperature affect the viscosity of liquids and gases ?

Detailed Solution for Test: Viscosity - Question 1

Hence, the viscosity of liquids decreases with increase in temperature. For gases, viscosity is due to collision between gas molecules. With increase in temperature, gas molecules attain more kinetic energy and the rate of collision is more. Hence, viscosity of gases increases with increase in temperature.

Test: Viscosity - Question 2

What is the SI unit for viscosity?

Detailed Solution for Test: Viscosity - Question 2

The SI unit for viscosity is the pascal-second (Pa·s). This unit is commonly used to measure viscosity, representing the resistance to flow in a fluid. It is essential in understanding how fluids behave under different conditions, such as temperature and pressure.

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Test: Viscosity - Question 3

At what temperature does water typically have a viscosity of about 1 centipoise (cP)?

Detailed Solution for Test: Viscosity - Question 3

Water at a temperature of 20°C typically exhibits a viscosity of approximately 1 centipoise (cP). This characteristic viscosity value serves as a reference point for understanding the behavior of fluids, especially in applications where water is a common medium.

Test: Viscosity - Question 4

What property does viscosity primarily refer to in fluids?

Detailed Solution for Test: Viscosity - Question 4

Viscosity in fluids primarily refers to the fluid's resistance to flow. This property is influenced by factors such as temperature, pressure, and the composition of the fluid. Higher viscosity indicates greater resistance to flow, making it harder for the fluid to move. Understanding viscosity is essential in various scientific fields, including fluid dynamics and materials science.

Test: Viscosity - Question 5

What are the two ways in which viscosity is commonly reported?

Detailed Solution for Test: Viscosity - Question 5

Viscosity is commonly reported in two ways: dynamic viscosity, which measures a fluid's resistance to flow, and kinematic viscosity, which is the ratio of dynamic viscosity to a fluid's density. Understanding these different ways of measuring viscosity is essential in various fields, including engineering, physics, and chemistry.

Test: Viscosity - Question 6

What is the dynamic viscosity of water at 20 °C?

Detailed Solution for Test: Viscosity - Question 6

At 20 °C, the dynamic viscosity of water is 1.0016 millipascal-seconds (mPa·s). This property indicates how resistant a fluid is to flow under an applied force. Water's viscosity at this temperature is crucial for various applications, from industrial processes to understanding fluid behavior in nature.

Test: Viscosity - Question 7

Why does water have a relatively low viscosity compared to most liquids with molecules of similar size?

Detailed Solution for Test: Viscosity - Question 7

Water exhibits a relatively low viscosity compared to most liquids with molecules of similar size because of the presence of hydrogen bonding between water molecules. These intermolecular forces play a significant role in determining the physical properties of water, including its viscosity. The hydrogen bonds create cohesion among water molecules, affecting how easily they can flow past each other.

Test: Viscosity - Question 8

What property characterizes a Newtonian fluid according to Newton's law of friction?

Detailed Solution for Test: Viscosity - Question 8

In accordance with Newton's law of friction, a Newtonian fluid maintains a constant viscosity, independent of the strain rate. This implies that under varying shear rates, a Newtonian fluid's viscosity remains the same.

Test: Viscosity - Question 9

What distinguishes Bingham plastics from other fluid types?

Detailed Solution for Test: Viscosity - Question 9

Bingham plastics behave like solids under regular circumstances but flow as viscous liquids under high stress conditions. This unique characteristic allows them to maintain their structure until a critical stress threshold is reached, beyond which they flow like liquids.

Test: Viscosity - Question 10

How is viscosity typically measured, and what devices are commonly used for this purpose?

Detailed Solution for Test: Viscosity - Question 10

Viscosity is commonly measured using viscometers and rheometers, with rheometers being a specialized type of viscometer. These devices are designed to measure either the flow of a fluid past a stationary object or the movement of an object through a fluid. The viscosity value obtained from these measurements represents the drag between the fluid and the object's surface. An interesting fact is that rheometers are particularly useful in studying complex fluids like gels, pastes, and biological fluids, offering detailed insights into their flow behavior.

Test: Viscosity - Question 11

What does the viscosity value obtained from viscometers and rheometers represent of fluid dynamics?

Detailed Solution for Test: Viscosity - Question 11

The viscosity value obtained from viscometers and rheometers represents the fluid's resistance to flow. This value indicates how easily a fluid flows under an applied force. Higher viscosity values suggest greater resistance, meaning the fluid is more resistant to flowing freely. Understanding viscosity is crucial in various industries, such as food processing, pharmaceuticals, and petroleum, where precise control of flow characteristics is essential for product quality and performance.

Test: Viscosity - Question 12

In American and British engineering, what units are used to measure viscosity?

Detailed Solution for Test: Viscosity - Question 12

In American and British engineering, viscosity is sometimes measured in pound-seconds per square foot (lb·s/ft²). This unit provides an alternate way to quantify viscosity in specific engineering contexts.

Test: Viscosity - Question 13

How does temperature affect the viscosity of liquids and gases, respectively?

Detailed Solution for Test: Viscosity - Question 13

When liquids are heated, their viscosity generally decreases because the heat provides the molecules with energy to move more freely past each other. In contrast, heating gases tends to increase viscosity as the molecules collide more frequently, affecting their flow characteristics. This distinction in the behavior of liquids and gases under temperature changes is crucial in understanding their properties and applications.

Test: Viscosity - Question 14

What happens to the viscosity of liquid water as the temperature increases from 20 °C to 80 °C?

Detailed Solution for Test: Viscosity - Question 14

The viscosity of liquid water decreases significantly as temperature increases from 20 °C to 80 °C. This phenomenon is important in understanding how the fluidity of water changes with temperature variations. The decrease in viscosity has implications for processes like heating water for various purposes, including cooking and industrial applications.

Test: Viscosity - Question 15

Which type of fluid exhibits a decrease in viscosity as the shear strain rate increases?

Detailed Solution for Test: Viscosity - Question 15

Shear-thinning fluids are characterized by a reduction in viscosity as the shear strain rate increases. This behavior is commonly observed in substances like ketchup, where the fluid becomes less viscous with higher shear rates, facilitating easier pouring or spreading.

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