Description : How many molecules per unit cell are there in a face centred cubic lattice? (A) 2 (B) 4 (C) 6 (D) 8
Last Answer : (B) 4
Description : How many atoms are there per unit cell in a body centred cubic lattice system? (A) 6 (B) 5 (C) 3 (D) 2
Last Answer : (D) 2
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 : 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 : 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 : A smallest three dimensional part of a crystal lattice is called. a) A particle b) A molecules c) A unit cell d) An atom
Last Answer : c) A unit cell
Description : Metal (M) crystallizes in a cubic unit cell with density 3.2 g/cc. Edge-length of the unit cell is `4.37Å` picometre (pm) The number of nearest neighb
Last Answer : Metal (M) crystallizes in a cubic unit cell with density 3.2 g/cc. Edge-length of the unit cell is `4.37Å` ... Ca atom are A. 4 B. 6 C. 8 D. 12
Description : Metal (M) crystallizes in a cubic unit cell with density 3.2 g/cc. Edge-length of the unit cell is `4.37Å` picometre (pm) The nearest neighbour will b
Last Answer : Metal (M) crystallizes in a cubic unit cell with density 3.2 g/cc. Edge-length of the unit ... diagonal C. On the face diagonal D. On opposite face
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 : 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 : 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 : 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 : Predict the entropy change in- (i) A liquid crystallizes into solid (ii) Temperature of a crystalline solid raised from 0K to 115K.
Last Answer : Ans. (i) Entropy decreases because molecules attain an ordered state. (ii) Entropy increases because from 0K to 115K average kinetic of moleculesincreases.
Description : Which form of sulphur is the most stable at room temperature? (A) Plastic (B) Monoclinic (C) Rhombic (D) Flowers of sulphur
Last Answer : (C) Rhombic
Description : Consider a unit square centred at origin. The coordinates of the square are translated by a factor (1/2, 1) and rotated by an angle of 90o . What shall be the coordinates of the new square ? (A) (-1/2, 0), (-1/2, 1), (-3/2, 1), (-3/2, ... , 1), (-3/2, 0) (D) (-1/2, 0), (1/2, 1), (-3/2, 1), (-3/2, 0)
Last Answer : (A) (-1/2, 0), (-1/2, 1), (-3/2, 1), (-3/2, 0)
Description : If magma crystallizes before it reaches earth's surface it will form a what igneous rock?
Last Answer : It will for an intrusive igneous rock. They usually take longerto cool and have more coarse grains.
Description : Assertion (A) Both rhombic and monoclinic sulphur exist as `S_(8)` but oxygen exists as `O_(2)`. Reason (R ) Oxygen forms `ppi-ppi` multiple bond due
Last Answer : Assertion (A) Both rhombic and monoclinic sulphur exist as `S_(8)` but oxygen exists as `O_ ... Statement-I is not correct and Statement-II is correct
Description : The temp. at which rhombic sulphur and monoclinic sulphur exist in equilibrium is
Last Answer : The temp. at which rhombic sulphur and monoclinic sulphur exist in equilibrium is A. `98^(@)C` B. `95.5^(@)C` C. `240^(@)C` D. `120^(@)C`
Description : Which allotrope of sulphur is insoluble in carbon disulphide? (A) Rhombic sulphur (B) Monoclinic sulphur (C) Plastic sulphur (D) Milk of sulphur
Last Answer : (C) Plastic sulphur
Description : C and Si both have same lattice structure, having 4 bonding electrons in each. However, C is insulator where as Si is intrinsic semiconductor. This is because (1) The four bonding electrons in the case of C ... the case of C lie in the second orbit, whereas in the case of Si they lie in the third
Last Answer : (4) The four bonding electrons in the case of C lie in the second orbit, whereas in the case of Si they lie in the third
Description : Out of 36 ATP molecules produced per glucose molecule during respiration (a) 2 are produced outside glycolysis and 34 during respiratory chain (b) 2 are produced outside mitochondria and 34 inside ... (c) 2 during glycolysis and 34 during Krebs' cycle (d) all are formed inside mitochondria
Last Answer : (b) 2 are produced outside mitochondria and 34 inside mitochondria
Description : Use the information and data given below to answer the questions Stronger intermolecular forces result in higher boiling point Strength of London forces increases with the number of electrons in the molecule ... here? (c) Why is the boiling point of HF highest while that of HCl lowest?
Last Answer : Ans :( a) In the molecules HCl, HBr and HI, dipole-dipole interaction and London forces are present. (b) Dipole moment of HCl > HBr > HI but boiling point of HCl < HBr
Description : When Arsenic atoms are added Germanium lattice, it becomes a/an - (1) Insulator (2) Superconductor (3) Intrinsic semiconductor (4) Extrinsic semiconductor
Last Answer : (4) Extrinsic semiconductor Explanation: When a peritavalent (donor) impurity, like arsenic, is added to germanium, it will form covalent bonds with thegermanium atoms, leaving 1 electron relatively ... this manner - either with Nor P-type impurities - are referred to as EXTRINSIC semiconductors.
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 : Which class of solids could have London Forces the attractive forces between particles in crystal lattice positions? w) ionic x) covalent y) metallic z) molecular
Last Answer : ANSWER: Z -- MOLECULAR
Description : The type of crystal lattice exemplified in a diamo is: w) ionic crystal x) covalent network crystal y) metallic crystal z) covalent molecular crystal
Last Answer : ANSWER: X -- COVALENT NETWORK CRYSTAL
Description : When Arsenic atoms are added to Germanium lattice, it becomes a/an (1) Insulator (2) Superconductor (3) Intrinsic semiconductor (4) Extrinsic semiconductor
Last Answer : Extrinsic semiconductor
Description : Thalassemia and sickle cell anaemia are caused due to a problem in globin molecule synthesis. Select the correct statement. (a) Both are due to a quantitative defect in globin chain synthesis. (b ... problem of globin molecules. (d) Both are due to a qualitative defect in globin chain synthesis.
Last Answer : (b) Thalassemia is due to less synthesis of globin molecules
Description : Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement : (1) Both are due to a quantitative defect in globin chain synthesis (2 ... problem of globin molecules (4) Both are due to a qualitative defect in globin chain synthesis
Last Answer : (2) Thalassemia is due to less synthesis of globin molecules
Description : An unknown amino acid has `0.32%` sulphur by mass . If each molecule has one sulphur atom only 1 g of amino acid has . . . . . . . Molecules :-
Last Answer : An unknown amino acid has `0.32%` sulphur by mass . If each molecule has one sulphur atom only 1 g of amino ... C. `6.02xx10^(24)` D. `6.02xx10^(23`
Description : How might simple molecules find each other and combine to make a complex molecule?
Last Answer : Feel Free to Answer
Description : When radiation breaks an electron pair bond in a molecule and each fragment of the molecule gets one of the bond electrons, the molecular fragments that are formed are called: w) ions x) free radicals y) stable molecules z) gases
Last Answer : ANSWER: X -- FREE RADICALS
Description : Which of the following molecules or ions is NOT formed when K metal reacts with liquid CH3OH? Is it: w) potassium ion x) hydrogen ion y) methoxy ion z) hydrogen molecule
Last Answer : ANSWER: X -- HYDROGEN ION
Description : When one heats concentrated sulfuric acid, one molecule of water is eliminated for every two molecules of sulfuric acid. What substance will result from this reaction?
Last Answer : ANSWER: PYROSULFURIC ACID or DISULFURIC ACID
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 : The extremely self centred nature of man has proven himself capable of more destruction than mother nature herself. What do you think?
Last Answer : No sayings are ever completely accurate. Humans can’t do the same amount of damage that a hurricane or earthquake could do in the same amount of time. But, the humans do intentionally do damage, while natural events don’t.
Description : Three centred two electron bond is present in
Last Answer : Three centred two electron bond is present in A. `NH_(3)` B. `B_(2)H_(6)` C. `BCl_(3)` D. `AlCl_(3)`
Description : What are the differences between Transactional Analysis and person centred therapy?
Last Answer : Need answer
Description : How does relational-centred planning differ from traditional models of case planning please help im working as a cyc worker for child and youth care and need help?
Description : In 321 BC Chandragupta founded the Mauryan Empire, which was centred in modern in Pakistan but had its capital far to the east at: A. Asaam B. Calcutta C. Delhi D. Patna
Last Answer : ANSWER: D
Description : A pointed arch which forms isosceles or equilateral triangle, is generally known as (A) Three centred arch (B) Two centred arch (C) Lancet arch (D) Bull's eye arch
Last Answer : Answer: Option C
Description : Crusades were centred around in………… (a) Rome (b) Saudi Arabia (c) Jerusalem (d) Palestine
Last Answer : (c) Jerusalem
Description : Which of the following is/are true about teacher/teaching? Options: A) teacher Should Have Control Over The Students To Maintain Peace And Order In The Class. B) Teaching Should Be Pupil Centred ... Subject Centred. C) Teacher Should Arouse Interest Among Students About The Subject D) All Of These
Last Answer : D) All Of These
Description : Modern Indian education at the Elementary school level can best be described as being Options: A) Curriculum-centred B) Project-centred C) Pupil-centred D) Subject-centred
Last Answer : C) Pupil-centred
Description : What is the number of atomic radii along the face diagonal of a face-centered unit cell?
Last Answer : ANSWER: 4
Description : The serological reaction where antigens and antibodies form an extensive Lattice of large particles is called a. Fixation. b. Precipitation. c. Neutralization. d. Agglutination.
Last Answer : c. Neutralization.
Description : Calculate the mass of 6.022 × 1023 molecule of Calcium carbonate (CaCO3) -Chemistry 9th
Last Answer : Molar mass (Molecular mass in gram) of CaCO3 = 40+12+3×16 = 100 g No. of moles of CaCO3 = No. of molecules/Avogadro constant = 6.022 × 1023/ 6.022 × 1023 = 1 mole Mass of CaCO3 = No. of moles × molar mass = 1 × 100 g = 100 g
Description : Find the mass of 1.5 mole of CO2 molecule. -Chemistry 9th
Last Answer : Let: n be the number of moles m be the mass M be the molecular weight n=1.5mol By definition: n=mM m=n⋅M M(C)=12g/mol M(O2)=2⋅16g/mol=32g/mol M=12g/mol+32g/mol M=44g/mol m=1.5mol⋅44g/mol m=66g