Tag: science & technology

Quizzes (551) Questions (11015)

Questions Related to science & technology

Multiple choice general knowledge science & technology

The convective heat transfer is based on the following law

  1. Newtons 3 rd law

  2. Kirchoff s law

  3. doesnt obey any law as it occurs without any medium

  4. Newtons law of cooling
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Convective heat transfer follows Newton's Law of Cooling, which states that the rate of heat loss is proportional to the temperature difference between the object and its surroundings. This law describes how convection works.

Multiple choice general knowledge science & technology

What is the order in which conduction takes place in the materials ?(starting from the materials that is highly conductive to that of the least )

  1. Puremetals-->Nonmetals-->Alloys-->liquids-->gases

  2. Puremetals-->Alloys-->Nonmetals-->liquids-->gases

  3. Nonmetals-->Alloys-->Puremetals-->liquids-->gases

  4. All materials exhibit same conductivity
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Electrical conductivity follows the order: pure metals (highest) > alloys > nonmetals > liquids > gases (lowest). Pure metals like copper and silver have the highest conductivity due to free electron movement. Alloys have reduced conductivity, nonmetals are semiconductors/insulators, and gases are the poorest conductors.

Multiple choice general knowledge science & technology

What is the dimensionless number associated with fin effectiveness??

  1. Biot No.

  2. Prandtl No.

  3. Nusselt No.

  4. Reynolds No.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Biot number (Bi = hL/k) characterizes the ratio of internal thermal resistance to external convective resistance, making it the key dimensionless parameter for fin effectiveness. Prandtl number relates to momentum/thermal diffusion in fluids, Nusselt number to convective heat transfer coefficient, and Reynolds number to flow regimes - none directly measure fin performance.

Multiple choice general knowledge science & technology

What are the various modes of heat transfer??

  1. Conduction and Radiation

  2. Diffusion and Evaporation

  3. Free and Forced Convection

  4. All of the above
Reveal answer Fill a bubble to check yourself
A,C Correct answer
Explanation

Heat transfer occurs through three fundamental modes: conduction (direct molecular interaction), convection (fluid motion), and radiation (electromagnetic waves). Conduction and radiation are distinct basic modes, while free and forced convection represent different convection mechanisms based on fluid driving forces.

Multiple choice general knowledge science & technology

Which component provides an executive level view of the entire quality center process?

  1. Quality center foundation

  2. Business process insight

  3. Service test component

  4. Quality center Dashboard
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The Quality Center Dashboard provides a high-level, executive view of the entire testing and quality management process. It aggregates data from all modules into visual reports and metrics suitable for management oversight.

Multiple choice general knowledge science & technology

Can you change the values of a called test's parameters?

  1. No, values are assigned at run time

  2. Yes, if the called set is a template test

  3. No, you must delete called set and call it again

  4. Yes, right click and choose called test parameters
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Quality Center allows you to modify the parameters of a called test by right-clicking on it and selecting 'called test parameters'. This enables you to customize the values passed to the called test during execution.

Multiple choice general knowledge science & technology

When you generate excel reports, why is it an advantage to use parameters?

  1. Enables the report be saved

  2. Enables the user to name the report

  3. Enables the report to be used across projects

  4. Enables the user to be used for different projects.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Using parameters in Excel reports makes them reusable across different projects. Instead of hardcoding project-specific values, parameters allow the same report template to be used with different data sources.