A camera uses a __________ to form an image.

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The science which deals with study of manners and customs of people is ?

A. Ethnology B. Morphology C. Ethics D. Genetics E. None of these...

Quartz crystal in quartz watches work on the principle called?

A. Photoelectric effect B. Stark effect C. Thermionic effect D. Piezo-electric effect E. None of these...

We always see the same face of the moon, because:

A. It is smaller than the earth B. It revolves on its axis in a direction opposite to that of the earth C. It takes equal time for revolution around the earth and rotation on its own axis D. It rotates at the same speed as the earth around the sun...

Saccharine is made up of?

Toluene Phenol Propane None of the above...

Who pioneered the idea of blood bank ?

A: Priestley B: landstainer C: Charles Drew D: Robert Hook...