Description : 0°K, is equivalent to – (1) 273°C (2) -273°C (3) 0°C (4) 100°C
Last Answer : (2) -273°C Explanation: 0 degrees Kelvin is equal to - 273.15 degrees Celsius. It is the lowest possible temperature, at which all molecules are have the least possible amount of kinetic energy.
Description : 0°K is equivalent to (1) 273°C (2) – 273°C (3) 0°C (4) 100°C
Last Answer : – 273°C
Description : 'Cryogenics' is concerned with the generation & use of low temperature in the range of (A) 0°K to 123°K (B) 0°C to - 123°C (C) 0°C to - 273°C (D) 0°K to 273°K
Last Answer : Option A
Description : Water has maximum density at – (1) 100°C (2) 0°C (3) 4°C (4) 273°C
Last Answer : (3) 4°C Explanation: The maximum density of water occurs at 4 °C because at. this temperature, two opposing effects are in balance. Water is an exceptional compound that has a lower density in the ... due to the ion nature of water in the liquid phase, which packs the molecules tightly together.
Description : Water has maximum density at (1) 100°C (2) 0°C (3) 4°C (4) 273°C
Last Answer : 4°C
Description : . Radiation energy is emitted by all the substances, which are above (A) 0°K (B) 0°C (C) 100°C (D) Room temperature
Last Answer : (A) 0°K
Description : The kinetic energy of gas molecule is zero at (A) 0°C (B) 273°C (C) 100°C (D) -273°C
Last Answer : D) -273°C
Description : Triple point of water is (A) 0°F (B) 492°R (C) 0°K (D) -273°C
Last Answer : (A) 0°F
Description : Carnot cycle efficiency is maximum when (a) initial temperature is 0°K (b) final temperature is 0°K (c) difference between initial and final temperature is 0°K (d) final temperature is 0°C (e) initial temperature is minimum possible.
Last Answer : Answer : b
Description : When heated from 0°C to 100°C volume of a given mass of water will – (1) Increase gradually (2) Decrease gradually (3) Increase and then will decrease (4) Decrease and then will Increase
Last Answer : (4) Decrease and then will Increase Explanation: When heated from 00 to 100 C volume of a given mass of water will first decrease and then increase. If the word "ice" or "solid" is not mentioned, the word "water" means liquid water.
Description : The density of water is 1 g/cc. This is strictly valid at – (1) 0°C (2) 4°C (3) 25°C (4) 100°C
Last Answer : (2) 4°C Explanation: Water never has an absolute density because its density varies with temperature. Water has its maximum density of 1 g/cm3 at 4 degrees Celsius. When the temperature changes from either greater or ... 1 g/cm3. Water has the maximum density of 1 g/cm3 only when it is pure water.
Description : Water will not be vaporized if – (1) the temperature is 0°C (2) the humidity is 0% (3) the humidity is 100% (4) the temperature is 100°C
Last Answer : (3) the humidity is 100% Explanation: If the relative humidity is 100 percent, water will not evaporate as the air is already saturated with moisture. When relative humidity approaches 100 percent, condensation can occur. The lower the relative humidity, the easier it is for moisture to evaporate.
Description : The density of water is 1 g/cc. This is strictly valid at (1) 0°C (2) 4°C (3) 25°C (4) 100°C
Description : Water will not be vapourised if (1) the temperature is 0°C (2) the humidity is 0% (3) the humidity is 100% (4) the temperature is 100°C
Last Answer : the humidity is 100%
Description : Water has maximum density at (a) Room temperature (b) 0°C (c) 4°C (d) 100°C
Last Answer : Ans:(c)
Description : Water has maximum density at – (1) -4°C (2) 0°C (3) 4°C (4) 100°C
Last Answer : (3) 4°C Explanation: When cooled from room temperature liquid water becomes increasingly dense, as with other substances, but at approximately 4 °C (39 °F), pure water reaches its maximum density.
Description : One kilogram of water at 0°C is changed to superheated steam of one atm pressure and 300° C. The major heat consumption in the process will be to (A) Heat the water from 0°C to 100°C (B) Evaporate the water (C) To superheat the steam (D) Data insufficient, can't be predicted
Last Answer : (B) Evaporate the water
Description : Maximum density of water exists at (a) 0°C (b) 4°C (c) 40°C (d) 100°C
Last Answer : (b) 4°C
Description : Absolute zero, pressure will occur, when the molecular momentum of the system becomes zero. A liquid will cease to exist as liquid at (A) High vacuum (B) Zero pressure (C) 0°K (D) Earth's centre
Last Answer : (B) Zero pressure
Description : The absolute zero temperature is taken as A. -273°C B. 273°C C. 237°C D. -237°C
Last Answer : Answer: A
Description : The pH of water at 25°C is 7. When it is heated to 100°C, then what will be the pH of water?
Last Answer : – Remains same
Description : Steam at 100°C causes more severe burns than water at 100° C because – (1) steam has no specific heat capacity (2) steam has latent heat of vaporization (3) water has no specific heat capacity (4) water has latent heat of fusion
Last Answer : (2) steam has latent heat of vaporization Explanation: It is because steam releases its latent heat as it condenses, which is substantial. The heat of vaporization of steam is over 2000 J per gram. And when it releases that it's then 100 degree water, the same as boiling water.
Description : Specific gravity is defined as the ratio of – (1) density of the substance to the density of water (2) density of the substance to the density of water at 0°C (3) density of water at 4°C to the density of the substance (4) density of the substance to the density of water at 4°C
Last Answer : (1) density of the substance to the density of water Explanation: Specific gravity is the ratio of the density of a substance to the density (mass of the same unit volume) of a reference substance. The reference substance is nearly always water for liquids or air for gases.
Description : The freezing point of fresh water is - (1) 4°C (2) 3°C (3) 5°C (4) 0°C
Last Answer : (4) 0°C Explanation: The freezing point of water is the temperature at which water changes phase from a liquid to a solid. Under normal conditions, ordinary water freezes at 0°C, or 32°F. ... or if there are impurities present in the water which could cause freezing point depression to occur.
Description : When water is heated from 0°C to 10°C. Its volume (1) increases (2) decreases (3) does not change (4) first decreases and then increases
Last Answer : (4) first decreases and then increases
Description : How much mechanical work must be done to completely melt 1 gram of ice at 0°C? (1) 4.2 J (2) 80 J (3) 336 J (4) 2268 J
Last Answer : (2) 80 J Explanation: When water at 0 degree Celsius freezes, each gram of water gives off 80 calories. The temperature of the water stays at 0 degree C until every drop has frozen. When ... heat-80 calories for each gram of ice-and its temperature remains unchanged until it has completely melted.
Description : Lakes freeze in cold countries in winter, leaving the water underneath at – (1) 0°C (2) 0°F (3) 4°C (4) 4°F
Last Answer : (3) 4°C Explanation: Lake ice cover is seasonal and occurs where average daily temperature is below the freezing point. Once formed the lake ice thickens over the course of the winter as the temperature ... 0 (zero) degrees Celsius water at the surface and denser 4 degrees Celsius at the bottom.
Description : The freezing point of fresh water is _______. (1) 4°C (2) 3°C (3) 5°C (4) 0°C
Last Answer : 0°C
Description : Specific gravity is defined as the ratio of (1) density of the substance to the density of water (2) density of the substance to the density of water at 0°C (3) density of water at 4°C to the density of the substance (4) density of the substance to the density of water at 4°C
Last Answer : density of the substance to the density of water
Description : How much mechanical work must be done to completely melt 1 gram of ice at 0°C ? (1) 4.2 J (2) 80 J (3) 336 J (4) 2268 J
Last Answer : 80 J
Description : Lakes freeze in cold countries in winter, leaving the water underneath at (1) 0°C (2) 0°F (3) 4°C (4) 4°F
Description : DNA is (A) Usually present in tissues as a nucleo protein and cannot be separated from its protein component (B) A long chain polymer in which the internucleotide linkages are of the diester type between C-3 ... linkages are between C-2' and C-5' (D) Hydrolyzed by weal alkali (pH9 to 100°C)
Last Answer : Answer : B
Description : Bence jones proteinurial characterized by (A) Non-heat coagulability (B) Heat coagulability at 100°C (C) Heat coagulability at 45 to 60°C (D) Precipitation at 25°C
Last Answer : Answer : C
Description : The boiling point of ammonia is (a) -100°C (b) -50°C (c) - 33.3°C (d) 33.3°C.
Last Answer : Ans: c
Description : The life expectancy of electrical insulation, is approximately halved for an increased operating temperature of _______________. A. 10°C B. 25°C C. 50°C D. 100°C
Description : Typical solvent polymerisation reaction conditions for the production of high density polythene by Zeigler process is (A) 7 kgf/cm2 and 70 °C (B) 1000 kgf/cm2 and 100°C (C) 7 kgf/cm2 and 700°C (D) 1 kgf/cm2 (gage) and 70°C
Last Answer : (A) 7 kgf/cm2 and 70 °C
Description : Which of the following would not be a suitable material of construction for handling aqueous hydrofluoric acid (HF) at 100°C? (A) Monel (B) Stainless steel (C) Graphite (D) Kel-F and Teflon
Last Answer : (B) Stainless steel
Description : Specify the material of construction suitable for handling concentrated HNO3 at 100°C. (A) High silicon iron, Kel-F and Teflon (B) Tin and wood (C) Silicone rubber (D) Stainless steel
Last Answer : (A) High silicon iron, Kel-F and Teflon
Description : steam distillation, the (A) Temperature is 100°C(B) Temperature is more than 100° C (C) Product must be immiscible with water (D) Temperature is higher than the boiling point of either component
Last Answer : (C) Product must be immiscible with water
Description : A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The ... = 283 s (B) t = 356 s (C) t = 400 s (D) t = 800 s
Last Answer : (D) t = 800 s
Description : Three materials A, B and C of equal thickness and of thermal conductivity of 20, 40 & 60 kcal/hr. m. °C respectively are joined together. The temperature outside of A and C are 30°C and 100°C respectively. The interface ... C will be at a temperature of __________ °C. (A) 40 (B) 95 (C) 70 (D) 50
Last Answer : (C) 70
Description : Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer co-efficient is 3k/l'. If the wall temperature ... wall temperature in degree centigrade? (A) 35.5 (B) 43.75 (C) 81.25 (D) 48.25
Last Answer : (C) 81.25
Description : The boiling temperature of the water in the radiator is raised to abouta) 100°C b) 105°C c) 110° C d) 115° C
Last Answer : c) 110° C
Description : At what temperature is gypsum heated to form Plaster of Paris?a) 90°C b) 100°C c) 110°C d) 120°C
Last Answer : b) 100°C
Description : In the manufacture of ortho-phosphoric acid by strong H2SO4 leaching wet process, keeping the reactor temperature above 100°C, results in the formation of undesirable (A) CaSO4 .½ H2O and CaSO4 crystals (B) Pyrophosphoric acid (C) Meta-phosphoric acid (D) All (A), (B) and (C)
Last Answer : (A) CaSO4 .½ H2O and CaSO4 crystals
Description : The rate of a chemical reaction is almost doubled for every 10°C rise in temperature. The rate will increase __________ times, if the temperature rises from 10 to 100°C. (A) 256 (B) 512 (C) 112 (D) 612
Last Answer : (B) 512
Description : A batch adiabatic reactor at an initial temperature of 373°K is being used for the reaction, A → B. Assume the heat of reaction is - 1kJ/mole at 373°K and heat capacity of both A and B to be constant and equal ... rise after a conversion of 0.5 will be: (A) 5°C (B) 10°C (C) 20°C (D) 100°C
Last Answer : (B) 10°C
Description : Which of the following reagents will react with furan to form 2-furansulfonic acid? (a) SO3 in pyridine at 100°C (b) Dilute H2SO4 at 200°C (c) SO2 at 100°C (d) Dilute H2SO4 at 100°C
Last Answer : SO3 in pyridine at 100°C
Description : Pyridine undergoes nuclophilic substitution with NaNH2 at 100°C to form (a) 2-Aminopyridine (b) 3-Aminopyridine (c) 4-Aminopyridine (d) None of these
Last Answer : 2-Aminopyridine
Description : Ethylene oxide is produced by oxidation of ethylene in presence of AgOcatalyst at (A) 1 atm & 100°C (B) 5 atm & 275°C (C) 100 atm & 500°C (D) 50 atm & 1000°C
Last Answer : (B) 5 atm & 275°C