A. Volatile substance B. Non-volatile substance C. Both A and B D. None of these
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A. Conventional current B. Eddy current C. Both D. None of these
A. Electrons flow inside and holes flow outside B. Holes flow inside as well as outside C. Holes flow inside and electrons flow outside D. Electrons flow inside as well as outside
A. Radius of earth B. Height of antenna C. Both A and B D. None of these
A. Radar B. Sonar C. Pukar D. None
A. Radar B. Sonar C. Pukar D. None
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A. Visible light rays B. Ultraviolet rays C. Infrared rays D. Sound waves
A. 36,000Km B. 18,000Km C. 10,000Km D. None
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A. Polarised B. Longitudinal C. Transverse D. None of these