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1431. The working of potical fibres is based on the ................ of electromagnetic waves.
A. refraction
B. reflection
C. total internal reflection
D. polarization
Explanation:
1432. When milk is churned, the cream separates from it due to the :
A. cohesive force
B. centrigugal force
C. frictional force
D. gravitational force
Explanation:
1433. ""mho"" is the unit of :
A. resistance
B. specific resistance
C. conductivity
D. none of these
Explanation:
1434. The hydraulic brakes used in atuomobiles is a direct application of :
A. Archimedes principle
B. Toricellian law
C. Bernoullis theorem
D. Pascals law
Explanation:
1435. There are approximately .......... muscles in human body.
A. 200
B. 350
C. 500
D. 700
Explanation:
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