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A. U.S.A

B. Japan

C. Brazil

D. Germany

A. AVO meter

B. Ammeter

C. Galvanometer

D. Ohmmeter

A. Insulator

B. Semi-conductor

C. Conductor

D. Superconductor

A. 300 meter per second

B. 315 meter per second

C. 340 meter per second

D. 362 meter per second

A. Infrared waves

B. Radio waves

C. Light waves

D. X-waves

A. 15 KHz

B. 30 KHz

C. 150 KHz

D. 90 KHz

A. Heat into x-rays

B. Sound into electrical signals

C. Electrical signals into pictures

D. Picture into electrical signals

A. E.C.G.

B. C.T. scan

C. E.E.G

D. MRI

A. Reduce the friction between the wheel and the axle

B. Increase the friction between the wheel and

C. Reduce the friction between ground and the wheel

D. None of these

A. It is a metal

B. Ratio of stress to strain is more

C. Ratio of stress to strain is less

D. Its density is high