Description : The general formula of naphthenes is (A) CnH2n + 2 (B) CnH2n-6 (where, n ≥ 6) (C) CnHn-4 (D) Same as that for olefins i.e. CnH2n
Last Answer : (B) CnH2n-6 (where, n ≥ 6)
Description : I. 12a^2 − a − 6 = 0 II. 8b^2 − 26b + 15 = 0 1 : if a > b 2 : if a < b 3 : if a ≥ b 4 : if a ≤ b 5 : if a = b or the relation between a and b cannot be established.
Last Answer : 4 : if a ≤ b
Description : I. 28a^2 + 25a − 8 = 0 II. 5b^2 − 13b − 6 = 0 1 : if a > b 2 : if a < b 3 : if a ≥ b 4 : if a ≤ b 5 : if a = b or the relation between a and b cannot be established.
Last Answer : 5 : if a = b or the relation between a and b cannot be established.
Description : . Which of the following relationships between co-efficient of friction (μ) between rock & roll and a (half of the angle of nip) of the particle to be crushed is correct? (A) μ > tan α (B) μ ≥ tan α (C) μ > tan 2α (D) μ ≤ tan α
Last Answer : (B) μ ≥ tan α
Description : I. 63x^2 – 275x + 300 = 0 II. 18y^2 – 85y + 100 = 0 1 : if x ≥ y 2 : if x ≤ y 3 : if x > y 4 : if x < y 5 : if x = y or relationship cannot be established
Last Answer : 2 : if x ≤ y
Description : I. 20x^2 – 119x + 176 = 0 II. 18y^2 – 123y + 209 = 0 1 : if x ≥ y 2 : if x ≤ y 3 : if x > y 4 : if x < y 5 : if x = y or relationship cannot be established
Last Answer : 5 : if x = y or relationship cannot be established
Description : I. 3x^2 – 47x + 184 = 0 II. 3y^2 – 38y + 119 = 0 1 : if x ≥ y 2 : if x ≤ y 3 : if x > y 4 : if x < y 5 : if x = y or relationship cannot be established
Last Answer : 3 : if x > y
Description : I. 56x^2 – 127x + 72 = 0 II. 6y^2 – 17y + 12 = 0 1 : if x ≥ y 2 : if x ≤ y 3 : if x > y 4 : if x < y 5 : if x = y or relationship cannot be established
Last Answer : 4 : if x < y
Description : I. 6x^2 – 71x + 195 = 0 II. 12y^2 – 97y + 195 = 0 1 : if x ≥ y 2 : if x ≤ y 3 : if x > y 4 : if x < y 5 : if x = y or relationship cannot be established
Last Answer : 1 : if x ≥ y
Description : I. 32a^2 + 52a + 15 = 0 II. 8b^2 + 38b + 35 = 0 1 : if a > b 2 : if a < b 3 : if a ≥ b 4 : if a ≤ b 5 : if a = b or the relation between a and b cannot be established.
Last Answer : 3 : if a ≥ b
Description : I. 2a^2 − 11a + 12 = 0 II. 35b^2 − 18b − 8 = 0 1 : if a > b 2 : if a < b 3 : if a ≥ b 4 : if a ≤ b 5 : if a = b or the relation between a and b cannot be established.
Last Answer : 1 : if a > b
Description : I. 20a^2 + 51a + 28 = 0 II. 15b^2 − 61b + 56 = 0 1 : if a > b 2 : if a < b 3 : if a ≥ b 4 : if a ≤ b 5 : if a = b or the relation between a and b cannot be established.
Last Answer : 2 : if a < b
Description : The grammar with production rules S → aSb |SS|λ generates language L given by: (A) L = {w∈{a, b}* | na(w) = nb(w) and na(v) ≥ nb(v) where v is any prefix of w} (B) L = {w∈{a, b}* | na(w) = nb(w) and na(v ... (D) L = {w∈{a, b}* | na(w) ≠ nb(w) and na(v) ≤ nb(v) where v is any prefix of w}
Last Answer : (A) L = {w∈{a, b}* | na(w) = nb(w) and na(v) ≥ nb(v) where v is any prefix of w}
Description : A set of processors P1, P2, ......, Pk can execute in parallel if Bernstein's conditions are satisfied on a pair wise basis; that is P1 || P2 || P3 || ..... || Pk if and only if: (A) Pi || Pj for all i ≠ j (B) Pi || Pj for all i = j+1 (C) Pi || Pj for all i ≤ j (D) Pi || Pj for all i ≥ j
Last Answer : (A) Pi || Pj for all i ≠ j Explanation: Bernstein's Condition: 1. If process Pi writes to a memory cell Mi, then no process Pj can read the cell Mi. 2. If process Pi read from a memory ... Mi. 3. If process Pi writes to a memory cell Mi, then no process Pj can write to the cell Mi.
Description : Olefins are generally represented by a) CnHn b) CnH2n c) CnH2n+2 d) CnH2n-6
Last Answer : Answer: a Explanation: Olefins are represented by CnHn and paraffins are generally represented by CnH2n+2.
Description : Paraffins are generally represented by a) CnHn b) CnH2n c) CnH2n+2 d) CnH2n-6
Last Answer : Answer: c Explanation: Paraffins are generally represented by CnH2n+2 while olefins are generally represented by CnHn .
Description : Do you expect the carbon hydride of the type (CnH2n+2) to acts as Lewis acid or bases? Justify your answer
Last Answer : Ans: carbon hydride of the types(CnH2n+2)are electron-precise hydrides. In other words they have exact number of electron to form covalent bonds therefore they do not show any tendency to either gain or lose electron hence they are neither Lewis acid or Lewis bases.
Description : Which of the following additives improves the cetane number of diesel? (A) Amyl nitrate (B) Ethyl mercaptan (C) Naphthenic acid (D) Tetra ethyl lead
Last Answer : (B) Ethyl mercaptan
Description : In solutizer sweetening process, solutizer solution used is (A) Methanol in Unisol process (B) Naphthenic acid in Mercapsol process (C) Both (A) and (B)
Last Answer : (C) Both (A) and (B)
Description : Which of the following is desirable in diesel and kerosene but is undesirable in gasoline? (A) Aromatics (B) Mercaptans (C) Paraffins (D) Naphthenic acid
Last Answer : (A) Aromatics
Description : Naphthenic acid is a/an __________ compound. (A) Sulphur (B) Nitrogen (C) Oxygen (D) None of these
Last Answer : (C) Oxygen
Description : CnH2n is the general formula for (A) Olefins (B) Naphthenes (C) Both (A) and (B) (D) Neither (A) nor (B)
Description : How many atoms in 6O2?
Last Answer : There are 12 atoms in 6 O2 molecules.
Description : C6H12O6 + 602 —>6O2 + 6HZO shows- (a) Photosynthesis (b) Respiration (c) Oxidation (d) Translocation of food mate-rials
Last Answer : (b) Respiration
Description : In the reaction, C6H12O6 + 6O2 6CO2 + 6H2O + energy, which component is → being reduced? A- O2 B- CO2 C- .H2O D- Energy
Last Answer : O2
Description : If h is chosen from a universal collection of hash functions and is used to hash n keys into a table of size m, where n ≤ m, the expected number of collisions involving a particular key K is (A) less than 1 (B) less than lg n (C) greater than 1 (D) greater than lg n
Last Answer : (A) less than 1
Description : Pick out the wrong statement. (A) Chamber process of sulphuric acid manufacture produces pure acid of concentration < 80% (B) Contact process of sulphuric acid manufacture produces pure acid of ... of 20% oleum (D) Contact process of sulphuric acid manufacture uses nickel as the catalyst
Last Answer : (D) Contact process of sulphuric acid manufacture uses nickel as the catalyst
Description : Consider a Hamiltonian Graph (G) with no loops and parallel edges. Which of the following is true with respect to this Graph (G) ? (a) deg(v) ≥ n/2 for each vertex of G (b) |E(G)| ≥ 1/2 (n-1)(n-2)+2 edges (c) deg(v) + deg( ... edge (A) (a) and (b) (B) (b) and (c) (C) (a) and (c) (D) (a), (b) and (c)
Last Answer : (D) (a), (b) and (c)
Description : The characterisation factor of a crude oil is calculated as 12.5. It meansthat; it is (A) Paraffinic (B) Naphthenic (C) Intermediate (D) None of these
Last Answer : (A) Paraffinic
Description : Crude oil produced by Indian oil fields are predominantly __________ in nature. (A) Paraffinic (B) Naphthenic (C) Asphaltic (D) Mixed base
Last Answer : (C) Asphaltic
Description : . Pick out the wrong statement. (A) Multigrade lubricating oils have high viscosity index (B) Paraffinic oil has very high viscosity index (C) Naphthenic oil has very low viscosity index (D) High viscosity index means a large change in viscosity with change in temperature
Last Answer : (D) High viscosity index means a large change in viscosity with change in temperature
Description : Both asphalt and wax are produced by __________ base crude oils. (A) Naphthenic (B) Asphalt (C) Paraffin (D) Mixed
Last Answer : (C) Paraffin
Description : Highest quality bitumen is produced from the __________ crude oil. (A) Paraffinic (B) Naphthenic (C) Intermediate (D) Mixed
Last Answer : (B) Naphthenic
Description : __________ base crude oil is also called asphaltic crude. (A) Paraffinic (B) Naphthenic (C) Mixed (D) Aromatic
Description : Identify the type of reaction(s) in the following equations. (i)CH4 + 2O2 CO2 + 2 H2O (ii) Pb(NO3)2 + 2KI ——–>Pbl2 + 2KNOs (iii) CaO + H2O ——–> Ca(OH)2 (iv) CuSO4 + Zn ——–> ZnSO4 + Cu -Chemistry
Last Answer : Answer. (i) Combustion reaction and oxidation reaction. (ii)Double displacement reaction and precipitation reaction. (iii) Combination reaction. (iv) Displacement reaction.
Description : What type of reaction is CH4 plus 2O2 - CO2 plus 2H2O?
Last Answer : Hydrocarbons such as methane burning in oxygen is an example ofoxidation and also combustion.
Description : What is a product in the following chemical reaction CH4 plus 2O2 CO2 plus 2H2O?
Last Answer : Products are carbon dioxide and water.
Description : What is 9/2o2?
Last Answer : For example, if you have the formula C3H6 + 9/2O2 --> 3CO2 + 3H2O, then usually it's a reduced balanced equation to find the (delta)H (standard molar enthalpie) of a molecule, which in this case would be for the ... be C3H6 + 9/2O2 --> 3CO2 + 3H2O to 2C3H6 + 9O2 --> 6CO2 + 6H2O. I hope this helps
Description : (1) the action of ultraviolet rays on oxygen Explanation: The majority of tropospheric ozone formation occurs when nitrogen oxides (NOx), carbon monoxide (CO ) and volatile organic compounds (VOCs), such as xylene, ... violet rays. NOx, CO, and VOCs are called ozone precursors. CO + 2O2 + CO2 + O3
Last Answer : Water is not effective in extinguishing a fire caused by petrol because - (1) the flame is too hot for water to cool it down (2) water and petrol react chemically (3) water and petrol are ... (4) water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn
Description : Absorption factor, for a fixed degree of absorption from a fixed amount of gas should be (A) 1 (B) > 1 (C) < 1 (D) ≤ 1
Last Answer : (B) > 1
Description : Pick out the wrong statement. (A) In case of heat transfer by purely forced convection, GR /Re 2 ≤ 1 (B) The equivalent diameter of heat transfer for a duct of ... nucleate boiling depends basically on the ease with which the bubbles are formed and detached from the heating surface
Last Answer : (B) The equivalent diameter of heat transfer for a duct of square crosssection (having each side as 'x') is equal to 4x
Description : Cetane number of high speed diesel must be ≥ (A) 30 (B) 45 (C) 75 (D) 95
Last Answer : (B) 45
Description : Feed size of ≥ 25 cms can be accepted by (A) Ball mill (B) Rod mill (C) Fluid energy mill (D) Jaw crusher
Last Answer : (D) Jaw crusher
Description : Purity of electrical grade aluminium should be ≥ __________ percent. (A) 95 (B) 99.5 (C) 85 (D) 90
Last Answer : (B) 99.5
Description : __________ pump is the most suitable device for discharging a liquid against a pressure of ≥ 1500 kgf/cm2 . (A) Centrifugal (B) Piston (C) Plunger (D) Vane
Last Answer : (C) Plunger
Description : Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N2 in contaminated air at ... asphyxiate is ≥ __________ percent. (A) 84 (B) 88 (C) 80 (D) 92
Last Answer : (A) 84
Description : A second order reaction of the form A + B → C is called a pseudo-first order reaction, when (A) CA0 = CB0 (B) CA0 > CB0 (C) CB0 > CA0 (D) CB0 ≥ CB0
Last Answer : (D) CB0 ≥ CB0
Description : . A mineral is termed as 'ore', if (A) A metal can be economically extracted from it (B) It contains ≥ 40% metal (C) The metal present in it is costly (D) All (A), (B) and (C)
Last Answer : (A) A metal can be economically extracted from it
Description : In a P-V diagram (for an ideal gas), an isothermal curve will coincide within adiabatic curve (through a point), when (A) Cp < Cv (B) Cp = Cv (C) Cp > Cv (D) C ≥ Cv
Last Answer : (B) Cp = Cv