Physics-Objective Related Question Answers
376. Mica is a good conductor of heat but bad conductor of?
Electricity
377. Copper and Aluminium are the metals commonly used in?
Electric circuit
378. Insulators used in electrical system?
Porcelain or Glass
379. Almost every liquid expands with increase in?
Temperature
380. When the temperature of water is increased from 0°C to 40, the volume?
Decreases
381. If the temperature is increased above 40 the volume starts?
Increasing
382. Temperature at which water has least volume and high density?
40°C
383. Water expands on?
Freezing
384. Water pipes break in winter in cold regions due to?
Freezing
385. Tendency of matter to change in volume in response to change in temperature is called?
Thermal Expansion
386. All substances expand on?
Heating
387. Mercury thermometer works on the principle of?
Thermal Expansion
388. Matter which expand most on heating?
Gases
389. Property of a material to conduct heat is called?
Thermal conductivity
390. Unit of thermal conductivity?
Watts per meter Kelvin (W/mK)
391. Co-efficient of thermal conductivity?
K Factor
392. The rate of cooling of hot water will be faster than the?
Tap water
393. In a refrigerator, cooling is produced by the evaporation of a?
Volatile liquid
394. The amount of water vapour present in air is called?
Humidity
395. When humidity occurs, perspiration is?
Maximum
396. The process by which a substance is changed from solid state to liquid state is called?
Melting
397. The fixed temperature at which a substance is changed from solid state to liquid state is called?
Melting point
398. Melting point of ice can be raised by the decrease of?
Pressure
399. Melting point of Mercury is?
39°C
400. Melting point of Alchohol is?
114°C
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