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You Are On Question Answer Bank SET 1985
99251. Water pipes break in winter in cold regions due to?
Answer: Freezing
99252. Tendency of matter to change in volume in response to change in temperature is called?
Answer: Thermal Expansion
99253. All substances expand on?
Answer: Heating
99254. Mercury thermometer works on the principle of?
Answer: Thermal Expansion
99255. Matter which expand most on heating?
Answer: Gases
99256. Property of a material to conduct heat is called?
Answer: Thermal conductivity
99257. Unit of thermal conductivity?
Answer: Watts per meter Kelvin (W/mK)
99258. Co-efficient of thermal conductivity?
Answer: K Factor
99259. The rate of cooling of hot water will be faster than the?
Answer: Tap water
99260. In a refrigerator, cooling is produced by the evaporation of a?
Answer: Volatile liquid
99261. The amount of water vapour present in air is called?
Answer: Humidity
99262. When humidity occurs, perspiration is?
Answer: Maximum
99263. The process by which a substance is changed from solid state to liquid state is called?
Answer: Melting
99264. The fixed temperature at which a substance is changed from solid state to liquid state is called?
Answer: Melting point
99265. Melting point of ice can be raised by the decrease of?
Answer: Pressure
99266. Melting point of Mercury is?
Answer: 39°C
99267. Melting point of Alchohol is?
Answer: 114°C
99268. Melting point of Ice is?
Answer: 0°C
99269. When liquid boils and changes itself into vapour at standard atmospheric pressure is called?
Answer: Boiling point
99270. When pressure increases boiling point?
Answer: Increases
99271. Boiling point of water?
Answer: 100°C
99272. Water inside a pressure cooker boils at a 'temperature of?
Answer: 120°C
99273. Sublimation is the process of conversion of a solid directly into?
Answer: Vapour eg: camphor
99274. Sublimation occurs when boiling point is less than?
Answer: Melting point
99275. The process of conversion of liquid into vapour at any temperature?
Answer: Evaporation
99276. Rate of evaporation increases with increase in temperature, surface area and decrease in?
Answer: Pressure
99277. While sweating under a fan we feel cool because of?
Answer: Evaporation
99278. A perfectly black body absorbs all types of?
Answer: Heat radiations
99279. Absorption power of perfectly black body is?
Answer: 1
99280. Device used to measure the temperature of Sun?
Answer: Pyroheliometer
99281. Study of high temperature?
Answer: Pyrology
99282. The radiation emitted from a black body is called?
Answer: Black body radiation
99283. The rate of flow of charge through a conductor per second is called?
Answer: Current
99284. SI unit is of current?
Answer: Ampere (A)
99285. Electric charge was first observed in a substance called?
Answer: Amber
99286. Unit of electric charge?
Answer: Coulomb
99287. 1 coulomb (c) =?
Answer: 6.24 X 1018 electrons
99288. Charge of an electron =..?
Answer: 1.6 x 10^-19C
99289. The region which surrounds the electrically charged particles?
Answer: Electric field
99290. The term electricity is coined by?
Answer: Gilbert
99291. Law of electrolysis were formulated by?
Answer: Michael Faraday
99292. The process of splitting up of a chemical substance when an electric current flows through it?
Answer: Electrolysis
99293. A good conductor of electricity?
Answer: Mercury
99294. The capacity of an electric field to do work on an electric charge?
Answer: Electric potential
99295. Pure water is a bad conductor of electricity because pure water does not dissociate into?
Answer: Ions
99296. Electro magnetism was discovered by?
Answer: Hans Christian Oersted
99297. Positively charged particles lose?
Answer: Electrons
99298. Negatively charged particles gain?
Answer: Electrons
99299. Electricity is divided into two?
Answer: (1) Static electricity (2) Dynamic electricity
99300. The electric charge built upon a material as a static mode?
Answer: Static electricity
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