Pick out the wrong statement. (A) A pale color of petroleum product indicates lower viscosity (B) Color of petroleum products indicates the degree of refinement (C) Lighter petroleum distillates are lighter in color than the heavier residual oils (D) Fluorescence of oils helps to detect its adulteration

Pick out the wrong statement.
(A) A pale color of petroleum product indicates lower viscosity
(B) Color of petroleum products indicates the degree of refinement
(C) Lighter petroleum distillates are lighter in color than the heavier residual
oils
(D) Fluorescence of oils helps to detect its adulteration
by

1 Answer

Answer :

(A) A pale color of petroleum product indicates lower viscosity
by

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Last Answer : (B) Bomb method and lamp method

Specific gravity of a petroleum product gives an indication of its (A) Degree of refinement (B) Hydrocarbon content type (aromatic or paraffinic) (C) Ease of atomisation (D) Sulphur content

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Last Answer : (B) Hydrocarbon content type (aromatic or paraffinic)

In a refinery petroleum crude is fractionated into gas fraction, light ends, intermediate distillates, heavy distillates, residues and by products. The group of products including gas oil, diesel oil and heavy fuel oil belongs to the fraction (A) Heavy distillates (B) Intermediate distillates (C) Light ends (D) Residues

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Last Answer : (D) High viscosity index means a large change in viscosity with change in temperature

When petroleum is refined it is subject to a number of processes including cracking. During the cracking process w) lighter hydrocarbons are combined to form heavier ones x) heavy hydrocarbons are broken up into lighter ones y) lighter hydrocarbons are separated by distillation z) oxygen is used to burn the heavier hydrocarbons

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Last Answer : (D) Independent of the type of oil, whether it is drying or non-drying

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You are given a set of scales and 12 marbles. The scales are of the old balance variety. That is, a small dish hangs from each end of a rod that is balanced in the middle. The device enables you to conclude either that the contents of the dishes weight the same or that the dish that falls lower has heavier contents than the other. The 12 marbles appear to be identical. In fact, 11 of them are identical, and one is of a different weight. Your task is to identify the unusual marble and discard it. You are allowed to use the scales three times if you wish, but no more. Note that the unusual marble may be heavier or lighter than the others. You are asked to both identify it and determine whether it is heavy or light -Riddles

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The fluorescence examination of the seminal stains indicates (a). Pink color (b). White color (c). Blue color (d). Red color

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Crude oil is subjected to vacuum distillation in the last stage, because (A) High boiling point products like heavy fuel oil & lubricating oils are heat sensitive and may decompose (B) Lighter/low boiling products are prone to thermal decomposition (C) High purity products can be obtained thereby (D) None of these

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Last Answer : (A) High boiling point products like heavy fuel oil & lubricating oils are heat sensitive and may decompose

Pick out the wrong statement regarding the solubility characteristics of high polymers. (A) Greater the degree of cross-linking in the polymer, lesser is its solubility (B) Polymers having more aliphatic character are more soluble in aliphatic solvents, while those polymers having more aromatic character are more soluble in aromatic solvents (C) Swelling tendency or solubility of polymers in a particular solvent decreases with increase in molecular weight of the solvent (D) High molecular weight polymers on dissolving gives solution of very low viscosity

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Pick out the wrong statement. (A) Indian coals on an average contain 25-30% ash as against 10-12% ash in imported coking coal (B) Ammonia is recovered in the form of ammonium sulphate in direct process of by-product recovery (C) A high swelling index number of coking coal indicates poor caking properties of coal (D) Wash oil is used for scrubbing Benzol from coke oven gas

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State the effect of temperature and adulteration on viscosity of liquid.

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LPG when brought to atmospheric pressure & temperature will be a (A) Liquid lighter than water (B) Liquid heavier than water (C) Gas lighter than air (D) Gas heavier than air

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Last Answer : (D) Gas heavier than air

Pick out the wrong statement. (A) Cold cracking of a weld is due to the presence of hydrogen gas in the weld (B) True stress is given by, σ = σE (1 + εE), where σE and εE are engineering stress and engineering strain respectively (C) Phosphorous can be easily recovered in the iron blast furnace (D) High residual stress at the surface is beneficial for fatigue properties of a material

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Pick out the wrong statement. (A) Main constituents of LPG are propane and butane (B) C.V. of natural gas is about 10000 KCal/Nm3 (C) C.V. of LPG is about 26000 kcal/Nm3 (11500 kcal/kg)(D) L.P.G. is lighter than air

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In the atmospheric pressure crude distillation, the content of __________ from lighter fraction to heavier ones. (A) Sulphur increases (B) Sulphur decreases (C) Nitrogen decreases (D) None of these

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Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because (A) Its calorific value is very less (B) Tar neutralises the residual acids present in pitch (C) It reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop (D) All (A), (B) and (C)

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Identify the incorrect statement. (a) Heartwood does not conduct water but gives mechanical support. (b) Sapwood is involved in conduction of water and minerals from root to leaf. (c) Sapwood is the innermost secondary xylem and is lighter in colour. (d) Due to deposition of tannins, resins, oils, etc., heartwood is dark in colour.

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Last Answer : Ans:(a)

Is ice heavier or lighter than liquid water?

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(2) it is lighter than air Explanation: Helium is the second lightest element and is the second most abundant element in the observable universe, being present at about 24% of the total elemental mass, which is more than 12 times the mass of all the heavier elements combined. A well-known but minor use is as a lifting gas in balloons and airships

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Increase in the specific gravity of petroleum products indicates (A) Decrease in paraffin content (B) Increase in thermal energy per unit weight

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With increase in density, the viscosity of petroleum products (A) Increases (B) Decreases (C) Remain same (D) Either (A) or (B)

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Last Answer : (B) The minimum temperature, at which a petroleum oil vapor catches fire and continues to burn, is called its flash point

A lighter object A and a heavier object B are initially at rest. Both are imparted the same linear momentum.

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Why does a heavier object fall with the same acceleration as the lighter object?

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Is there different sized TV mounts for lighter and heavier TV sets?

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Two stones of unequal masses are thrown vertically up with the same velocity. Which of the following will happen? (1) The heavier mass will reach greater height (2) The lighter mass will reach greater height (3) Both will reach the same height (4) Any of them may reach greater height

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When an object is heated, the molecules of that object - (1) began to move faster (2) lose energy (3) become heavier (4) become lighter

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Last Answer : a) Heavier

A tractor with fewer wheels Base, higher ground clearance may work successful in which soil A. B. 30-35 D. 40-45 Heavier C. Black cotton soil B. Wet soil D. Lighter soil

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Two stones of unequal masses are thrown vertically up with the same velocity. Which of the following will happen? (1) The heavier mass will reach greater height (2) The lighter mass will reach greater height (3) Both will reach the same height (4) Any of them may reach greater height

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The catalytic cracking of heavier petroleum fraction is done to produce mainly (A) Gasoline (B) Asphalt (C) Diesel oil (D) Tar

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Pick out the wrong statement. (A) Constant pressure distillation cannot separate an Azeotropic mixture (B) Relative volatility of a binary mixture changes appreciably with the minor change in temperature (C) The relative volatility of a binary mixture at Azeotropic composition is unity (D) Flash distillation is practised on wide spread scale in petroleum refinery

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Pick out the wrong statement. (A) Pensky-Marten apparatus is used for determining flash points above 50°C (B) Characterisation factor of paraffinic crude oil is more than 12 (C) Abel apparatus is used for determining flash points below 50°C (D) An oil having high susceptibility to change in viscosity with temperature changes, has a high viscosity index

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Last Answer : (D) An oil having high susceptibility to change in viscosity with temperature changes, has a high viscosity index

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