The SI base unit for mass is:

A. Milligram

B. Gram

C. kilogram

D. None of these

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Which lens is by a camera to form an image?

A. convex lens

B. concave lens

C. condenser lens

D. None of these (more…)

Sound energy is converted into _________ by a microphone?

A. Microwaves

B. Electrical signals

C. Optical Signals

D. Heat energy

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1 BTU(British thermal unit) is equal to how many joules?

A. 955 joules

B. 990 joules

C. 1055 joules

D. 1211 joules

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