The vacuum in a thermoflask reduces heat loss resulting from?
A. radiation only B. conduction and convection only C. radiation and convection only D. conduction only Correct Answer: Option B – conduction and convection only
Which of the following cases cannot produce total internal reflection? A light ray travelling from
A. glass to water B. kerosene to air C. air to water D. water to ice Correct Answer: Option C – air to water
A loaded spring is set in simple harmonic motion. The force that tends to restore the load to its equilibrium position is
A. adhesive B. elastic C. frictional D. gravitational Correct Answer: Option D – gravitational
Which of the following waves is not mechanical?
A. Waves in pipes B. Water waves C. Radio waves D. Sound waves Correct Answer: Option C – Radio waves
A body of mass 2 kg is released from a point 100 m above the ground. Calculate its kinetic energy 80m from the point of release.
A. 1600 J B. 900 J C. 600 J D. 200 J Correct Answer: Option A – 1600 JProducts
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