The main reason for making the cover of a vacuum flask airtight is to prevent heat loss by?
A. convection B. conduction C. radiation D. evaporation Correct Answer: Option A – convection
One end of a long wire is fixed while a vibrator is attached to the other end. When the vibrator is energized, the types of waves generated in the wire are?
A. stationary and longitudinal B. stationary and transverse C. progressive and transverse D. progressive and longitudinal Correct Answer: Option A – stationary and longitudinal Explanation The vibrator is fixed at the end of the rope, hence, it is stationary....
A thin wire with heavy weights attached to both ends is hung over a block of ice resting on two supports. If the wire cuts through the ice block while the block remains solid behind the wire, the process is called?
A. condensation B. sublimation C. regelation D. fusion Correct Answer: Option C – regelation
A boy observes a piece of stone at the bottom of a river 6.0m deep. If he looks from the surface of the river. What is the apparent distance of the stone from him? [Refractive Index of Water = 4/3]
A. 8.0m B. 5.5m C. 5.0m D. 4.5m Correct Answer: Option D = 4.5m Explanation Refractive Index = Real Depth/App. Depth 4/3 = 6/app. depth App Depth = (3 x 6)/4 = 4.5mWhich of the conditions below are necessary to produce interference fringes?
I. Coherence II. Same frequency III. Same wavelength IV. Same Intensity A. I and III B. I, II and IV C. I, II and III D. II and III Correct Answer: Option C – I, II and IIIProducts
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