Q. The mass of an ice bar is 200 g. If the specific latent heat of fusion of ice is 340 kJ, then what is the thermal energy required to melt?

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Q. The amount of thermal energy required to change 1 Kg of the solid to liquid, or vice versa, without any temperature change is known as

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Q. A heating fan supplies thermal energy at constant rate of 1000 W is immersed completely in a 2.5 Kg of block of ice at 0 °C. The ice block takes 1150 s to melt fully. What is the value for the specific latent heat?

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Q. The thermal energy required to change the substance from liquid to vapor state, or vice versa, without any temperature change is known as

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Q. A thermocouple thermometer can measure very hot temperatures of up to

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Q. An instrument that can be used at a distance, which allows scientist to work the instrument at a safer place is called

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Q. The equation of the thermocouple thermometer is

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Q. A thermocouple thermometer consists basically of

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Q. The perfect instrument for measuring the temperature of lava is

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Q. Optical fibers are made up of

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Q. The inner part of the fiber optics which carries light is called

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Q. The outer concentric shell of the fiber optics is called

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Q. As compare to copper wires, the optical fibers carry

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Q. As compare to copper wires, the optical fibers are

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Q. A medical device using optical fibers to enable doctors to see organs inside a human body, such as intestine, is called

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Q. Total internal reflection takes place only when a ray of light travels from an optically denser to a

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Q. A medical procedure using any type of endoscope is called

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Q. Which of the following is used in fiber optics?

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Q. Total internal reflection takes place only when the angle of incidence in the optically denser medium is

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Q. Telephone conversations and internet data are now transmitted across continents using

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