Description : Which of the following digits have two lines of symmetry ? `0,1,2,3,4,5,6,7,8,9`
Last Answer : Which of the following digits have two lines of symmetry ? `0,1,2,3,4,5,6,7,8,9`
Description : Which of the following crystal structures characterises the austenitic stainless steel? (A) Simple hexagonal (B) Body centred cubic (C) Face centred cubic (D) None of these
Last Answer : (C) Face centred cubic
Description : Pick out the wrong statement. (A) Metal/alloys having hexagonal crystal lattice structure are less malleable than those having cubic crystal lattice structure (B) Metal/alloys having body centred cubic ... D) Both ferritic & austenitic stainless steel has a face centred cubic (fcc) crystal structure
Last Answer : (C) Tungsten has a body centred cubic (bcc) crystal lattice structure
Description : Which of the following crystal structures characterises the ferritic stainless steel? (A) Face centred cubic (B) Body centred cubic (C) Simple hexagonal (D) None of these
Last Answer : (B) Body centred cubic
Description : Nickel as a material of construction (A) Is used as an alloying element for both ferrous & non-ferrous alloys (B) Is paramagnetic below 415° C (its Curie temperature) (C) Diamagnetic (D) Has a body centred cubic (bcc) crystal lattice structure
Last Answer : (A) Is used as an alloying element for both ferrous & non-ferrous alloys
Description : Most of the common metals have __________ crystal structure. (A) Cubic (B) Hexagonal (C) Orthorhombic (D) None of these
Last Answer : (A) Cubic
Description : The crystal structure of most of the common metals is (A) Orthorhombic (B) Cubic (C) Hexagonal (D) None of these
Last Answer : (B) Cubic
Description : Out of the following, the lowest packing of atoms exists in __________ crystal lattice structure. (A) Hexagonal close, packed (hcp) (B) Face centred cubic (fcc) (C) Body centred cubic (bcc) (D) Simple cubic
Last Answer : (D) Simple cubic
Description : Closeness of packing is maximum in case of __________ crystal lattice. (A) Face centred (B) Simple cubic (C) Body centred (D) None of these
Last Answer : (A) Face centred
Description : Mild steel has __________ crystal lattice structure. (A) Face centred cubic (fcc) (B) Body centred cubic (bcc) (C) Orthorhombic (D) Cubic
Last Answer : (B) Body centred cubic (bcc)
Description : How many atoms per unit cell are in a face-centered-cubic crystal? w) two x) four y) six z) eight
Last Answer : ANSWER: X -- FOUR
Description : How many lines of rotational symmetry does a arrowhead have?
Last Answer : Need answer
Description : How many lines of symmetry does japan flag have?
Last Answer : 1.0E+79
Description : How many lines of symmetry does a letter k have?
Last Answer : The lower case k, as shown in the question, has 0 lines ofsymmetry.
Description : What Three digit numbers that have 3 lines of symmetry?
Last Answer : 111 and 888 are two possible examples, although it all dependson the font.
Description : How many lines of symmetry isosceles trapezium have?
Last Answer : It has 1 vertical line of symmetry
Description : Is the only quadrilateral with 2 lines of symmetry a rectangle?
Last Answer : Feel Free to Answer
Description : The area of the triangular region, in the following figure, bounded by the lines 2x-y=1 and x+2y=13 and Y-axis is (a) 11.25 sq.units (b) 9.75 sq.units (c) 16.25 sq,units (d) 18.75 sq.units
Last Answer : (a) 11.25 sq.units
Description : How many neighboring atoms are in contact with eac atom in a monatomic body-centered cubic structure. w) 4 x) 6 y) 8 z) 12
Last Answer : ANSWER: Y -- 8
Description : A jet of water of cross-sectional area 20 sq. cm impinges on a plate at an angle of 60? with a velocity of 10 m/sec. Neglecting the friction between the jet and plate (density of water 1000/9.81 kgm-1 sec2 per cubic meter), the ... a.15 - 20 kg b.20 - 25 kg c.5 - 10 kg d.25 - 30 kg e.10 - 15 kg
Last Answer : a. 15 - 20 kg
Description : convert 9 cubic centimeters to fluid ounces (to the nearest thousandth). -General Knowledge
Last Answer : 9 cubic centimeters is equal to 0.304 fluid ounces. 1 cubic centimeters = 0.03381 fluid ounces
Description : Is the Avanti Avanti about the same size as the freezer on my refrigerator at 2.9 cubic feet?
Last Answer : The Avanti offers 2.9 cubic feet of freezer storage space.
Description : To displace a cubic foot of fresh water, you need _________ force. a. 62.4 lb b. 9.81 lb c. 76 lb d. 760 lb
Last Answer : 62.4 lb
Description : What is the theoretical limit of the efficiency of a single-crystal single-junction cell in a photovoltaic system? w) 9 percent x) 29 percent y) 79 percent z) 99 percent
Last Answer : ANSWER: X -- 29 PERCENT
Description : Why do alcohols have boiling points much higher than hydrocarbons of similar molecular weight? (a) Alcohols have greater van der Waals attraction forces. (b) Alcohol molecules have greater ... of volatilization. (d) Alcohols must overcome greater ionic forces in the process of volatilization.
Last Answer : Hydrogen bonds must be broken in the process of volatilization
Description : Why do trans isomers of alkenes have lower boiling points than cis isomers? (a) trans isomers have better symmetry (b) cis isomers have better symmetry (c) trans isomers are less polar (d) cis isomers are less polar
Last Answer : trans isomers are less polar
Description : Which of the following is a true statement? (a) All chiral molecules possess a plane of symmetry. (b) All achiral molecules are meso. (c) All molecules which possess a single asymmetric center of the S configuration are levorotatory. (d) A mixture of achiral compounds will be optically inactive
Last Answer : A mixture of achiral compounds will be optically inactive
Description : 2-Butanol is optically active because it contains : (a) an asymmetric carbon (b) a plane of symmetry (c) a hydroxyl group (d) a centre of symmetry
Last Answer : (a) an asymmetric carbon
Description : A meso compound : (a) is an achiral molecule which contains chiral carbons (b) contains a plane of symmetry or a centre of symmetry (c) is optically inactive (d) is characterized by all of the above
Last Answer : ) is characterized by all of the above
Description : A molecule is said to be chiral (a) if it contains plane of symmetry (b) if it contains centre of symmetry (c) if it cannot be superimposed on its mirror image (d) if it can be superimposed on its mirror image
Last Answer : if it cannot be superimposed on its mirror image
Description : Which of the following is optically inactive? a. equimolar mixture of enantiomers b. Solution of pure enantiomer c. Mixture of enantiomers with enantiomeric excess of one isomer d. Molecule without symmetry elements
Last Answer : a. equimolar mixture of enantiomers
Description : Can you find the axis of symmetry of the graph of y = arctan(x) + arctan(6 - x)
Last Answer : answer:We can start by finding the vertex. So when does dy/dx=0? dy/dx = 1/(1+x^2) - 1/(1+(6-x)^2) = 0. Note that when x=3, this equation is true. So, the line of ... This graph is parabolic, and therefore has only one vertex. 2) This graph is symmetric. This could also be proved using derivatives.
Description : (1) they contain free electrons Explanation: Metals typically consist of closepacked atoms, meaning that the atoms are arranged like closely packed spheres. Two packing motifs are common, one ... surrounded by six neighboring atoms. Several metals adopt both structures, depending on the temperature.
Last Answer : Helium gas is filled in ballons because (1) its atomic number is 2 (2) it is lighter than air (3) it is one of the constitutents of water (4) it is a noble gas
Description : (a) If the radius of the Br ion is 0.182 nm, how large a cation can fit in each of the tetrahedral hole. (b) AgI crystallizes in a cubic closed packed ZnS structure. What fraction of tetrahedral site ... Ag ion ? (c) At what temp. range, most of the metals becomes super conductors ?
Last Answer : (a) For a tetrahedron the limiting ratio is 0.225 – 0.414 For largest cation highest value 0.414 would be considered. r + / r– = 0.414 r + = 0.414 × 0.182 = 0.075 nm. (b) In FCC there are 8 tetrahedral voids. Out of this ½ is occupied by Ag cation. (c) 2 k – 5 k.
Description : The ratio of spacing (d) for for simple cubic lattice, d(100) :d(110) :d(111) a. 1 : 0.707: 0.669 b. 1: 1.414: 0.577 c. 1: 0.707 : 0.577 d. 1: 0.707 : 1.154
Last Answer : c. 1: 0.707 : 0.577
Description : The number of octahedral void(s) per atom present in a cubic close-packed structure is (1) 4 (2) 1 (3) 3 (4) 2
Last Answer : 1
Description : A sample of gas has a volume of 210 cubic centimeters at a temperature of 250 degrees Kelvin. The temperature is raised to 500 degrees Kelvin while the pressure remains unchanged. What is the new volume of the gas.
Last Answer : ANSWER: 420 CUBIC CENTIMETERS
Description : The equilibrium constant for the gas phase reactio A + B = C + D is 10-3. The rate of the forward reaction is 10-11 cubic centimeters per molecule per second. What is the rate constant of ... second y) 10-10 cubic centimeters per molecule per second z) 10-14 cubic centimeters per molecule per second
Last Answer : ANSWER: Z -- 10-14 CUBIC CENTIMETERS PER MOLECULE PER SECOND
Description : Cubic crystals containing lattice points only at the corners are called: w) body centered x) face centered y) simple z) hexagonal
Last Answer : ANSWER: C-SIMPLE
Description : Giving a suitable example for each, explain the following : (i) Crystal field splitting (ii) Linkage isomerism (iii) Ambidentate ligand -Chemistry
Last Answer : i) Crystal field splitting: It is the splitting of the degenerate energy levels due to the presence of ligands. When ligand approaches a transition metal ion, the degenerate d-orbitals split into two ... the nitrogen atom or one of the oxygen atoms. Example : - SCN thiocyanate, - NCS isothiocyanate
Description : What is Glober Salt Crystal ?
Last Answer : Glober salt crystal Na2SO4. 10H2O
Description : What is crystal water ?
Last Answer : Crystal water: Crystal water is water which is essential for the formation of certain crystals of a compound .
Description : (3) reflection of light due to the presence of free electrons Explanation: Lustre (or luster) is the way light interacts with the surface of a crystal, rock, or mineral. The word ... conductivity, and high density. Typically they are malleable and ductile, deforming -under stress without cleaving.
Last Answer : Cloud is a colloidal dispersion of – (1) Air in a dispersion medium of water (2) Fog in a dispersion medium of water (3) Mist in a dispersion medium of air (4) Water drops in a dispersion medium of air
Description : (2) stabilise the colloid and prevent crystallisation Explanation: Gelatine, being a colloid, has the property of preventing crystallization. In ice lollies and icecream this is demonstrated by the formation ... does not become grainy or sandy due to the slow crystallisation of lactose with time.
Last Answer : Glycol is added to aviation gasoline because it - (1) reduces evaporation of petrol (2) increases efficiency of petrol (3) prevents freezing of petrol (4) reduces consumption of petrol
Description : Glass is - (1) Super cooled liquid (2) Crystalline solid (3) Liquid crystal (4) None of these
Last Answer : (1) Super cooled liquid Explanation: Glass is sometimes called a Super cooled liquid because it does not form a crystalline structure, but instead forms an amorphous solid that allows molecules in the material to continue to move.
Description : Which of the following is a natural dye? (1) Crystal violet (2) Aniline blue (3) Alizarin (4) Phenolphthalein
Last Answer : (3) Alizarin Explanation: Alizarin or 1,2- dihydroxyanthraquinone (also known as Mordant Red 11 and Turkey Red is an organic compound with formula C14H8O4 that has been used throughout history as a ... of the madder genus. In 1869, it became the first natural pigment to be duplicated synthetically.
Description : Which have more entropy real crystal or ideal crystal and why?
Last Answer : Ans. Real crystal has more entropy because it has more disorderness.
Description : A real crystal has more entropy than an Ideal crystal. Why?
Last Answer : Ans. A real crystal has some disorder due to presence of defects in their structural arrangement, and Ideal crystal does not have any disorder.
Description : Give reasons : (a) Window glass of old building look milky. b) Window glass of old building is thick at bottom. (c) CaCl2 will introduce Schottky defect if added to AgCl crystal.
Last Answer : (a) Due to annealing over a number of years glass acquires some crystalline character. (b) Glass is not a true solid. But a super-cooled liquid of high viscosity. It has the property to ... to maintain electrical neutrality. Thus a hole is created and lattice site for every Ca2+ ion introduced.
Description : -------------- does not affect the perfection of the crystal. a) Point defect b) Line defect c) Surface defect d) Volume defect
Last Answer : a) Point defect