Tag: fluid dynamics

Quizzes (0) Questions (23)

Questions Related to fluid dynamics

Multiple choice fluid dynamics option b: engineering physics physics

More viscous oil is used in summer than in winter in motors due to

  1. rise in temperature in summer, the viscosity of oil increases.

  2. rise in temperature in summer, the viscosity of oil decreases.

  3. surface tension of oil decreases.

  4. surface tension of oil increases.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Due to rise in temperature viscosity of oil decreases in summers. So more viscous oils are used for better lubricant protection.

Multiple choice fluid dynamics option b: engineering physics physics

With the increasing molecular mass of a liquid, the viscosity .

  1. decreases

  2. increases

  3. no effect

  4. all wrong
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

With the increasing molecular mass of a liquid, the viscosity increases.
The flow of molecules is inversely proportional to its mass. Hence, liquids with high molecular mass possess greater viscosity.

Multiple choice fluid dynamics option b: engineering physics physics

When cooking oil is heated in a frying pan, the oil moves around in the pan more easily when it is hot. The main reason for this is that with rise in temperature, there is a decrease in

  1. density

  2. surface tension

  3. viscosity

  4. angle of contact
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

That is true. The temperature dependence of liquid viscosity is the phenomenon by which liquid viscosity tends to decrease (ore, alternatively, its fluidity tends to increase) as its temperature increase.