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By Everyday Science Mcqs No Comments

Which of the following principleis used to produce ‘low-temperatures’ ?

A. Super conductivity
B. Joule-Kelvin effect
C. Thermo-electric effect
D. Adiabatic demagneti-sation

Submitted by: Malik Asghar Hussain

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Magnetic refrigeration is a cooling technology based on the magneto-caloric effect. This technique can be used to attain extremely low temperatures, as well as the ranges used in common refrigerators, depending on the design of the system. The magnetocaloric effect (MCE, from magnet and calorie) is a magneto-thermodynamic phenomenon in which a change in temperature of a suitable material is caused by exposing the material to a changing magnetic field. This is also known by low temperature physicists as adiabatic demagnetization, due to the application of the process specifically to create a temperature drop.

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  1. The echo (reflected sounD. will be distinctly heard only at ordinary temperatures if the distance of the reflecting surfaces from the source of sound is at least ________?

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    C. 56 ft
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  3. In a very low temperature which from the following will freeze at last?

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  4. The vitamin Folate works together with __________ to produce new red blood cells?

    A. Vitamin D
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    C. Vitamin B-12
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  5. Which gas does a Photocopier machine produce?

    A. Ozone 
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  6. Only male frog produce croacking sound because _________ ?

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  7. BCG vaccine is used to produce immunity against___________?

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  8. What is the medical term for low blood sugar?

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