Vitamin E reduces the requirement of _________ .
Vitamin E reduces the requirement of _________ .
A. Iron
B. Zinc
C. Selenium
D. Magnesium
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How many milky teeth or primary teeth does a human have?
How many milky teeth or primary teeth does a human have?A. 33
B. 20
C. 15
D. 32Humans usually have 20 primary (deciduous, “baby” or “milk”) teeth and 32 permanent (adult) teeth. Most people know these teeth as baby teeth, though they are also sometimes called milk teeth or primary teeth. In all, children have 20 baby teeth – 10 on the top and 10 on the bottom. These teeth act as placeholders for the adult teeth that grow in after the baby teeth fall out.
The Aurora Borealis, also known as ________?
The Aurora Borealis, also known as ________?A. Western lights
B. Southern lights
C. Eastern lights
D. Northern lightsDiesel engine was discovered by___________?
Diesel engine was discovered by___________?
A. Paul Muller
B. Faraday
C. Waldeyer
D. Rudolf DieselFor burning, which agent is necessary?
For burning, which agent is necessary?A. Oxygen
B. Hydrogen
C. Carbon
D. FireWhich layer of the atmosphere reflects radio waves back to the earth’s surface?
Which layer of the atmosphere reflects radio waves back to the earth’s surface?A. Troposphere
B. Stratosphere
C. Ozone layer
D. IonosphereDioptre is a unit of measurement for __________ ?
Dioptre is a unit of measurement for __________ ?A. Current
B. Lens
C. Force
D. Focal LengthA dioptre is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres. (1 dioptre = 1 m−1.) It is thus a unit of reciprocal length.