Which one of the following cannot be polarized ?
Which one of the following cannot be polarized ?
A. radio waves
B. ultraviolot rays
C. X-rays
D. sound waves
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Waves transmit ________________ from one place to another?
Waves transmit ________________ from one place to another?A. energy
B. mass
C. both
D. noneWhich one is the derived quantity in SI units _____________?
Which one is the derived quantity in SI units _____________?A. Electric current
B. Electric charge
C. Plane angle
D. Amount of substanceRain drops fall from great height Which among the following statements is true regarding it?
Rain drops fall from great height Which among the following statements is true regarding it?A. they fall with that ultimate velocity, which are different for different droplets
B. they fall with same ultimate velocity
C. their velocity increases and they fall with different velocity on the earth
D. their velocity increases and they fall with same velocity on the earthA bird sitting on a high tension electric wire does not get electrocuted because:
A bird sitting on a high tension electric wire does not get electrocuted because:A. Sit has high resistance
B. the body is earthed
C. it does not form a closed path for the flow of current
D. its feet are good insulatorsA point source of light placed in a homogeneous medium gives rise to ___________________?
A point source of light placed in a homogeneous medium gives rise to ___________________?A. a cylindrical wave front
B. an elliptical wave front
C. a spherical wave front
D. a plane wave frontT.V sets and microwave ovens emit ___________________?
T.V sets and microwave ovens emit ___________________?A. X-rays
B. α-rays
C. β-rays
D. γ-rays