(i) HF (ii) HCl (iii) HBr (iv) HI Correct Answer: (i) HF Explanation: HF is the halogen acids that must have the highest bond dissociation enthalpy.
Compound∆diss (E—H)/kJ mol–1 NH3389 PH3322 AsH3297 SbH3255 (i) NH3 (ii) PH3 (iii) AsH3 (iv) SbH3 Correct Answer: (iv) SbH3 Explanation: SbH3 is the compound that will act as the strongest...
(i) It is highly poisonous and has smelled like rotten fish. (ii) It’s a solution in water decomposes in the presence of light. (iii) It is more basic than NH3 (iv) It is less basic than NH3 ...
(i) H3PO2 (ii) H3BO3 (iii) H3PO4 (iv) H3PO3 Correct Answer: (iii) H3PO4 Explanation: H3PO4 is the acid that form three series of salts.
(i) The low oxidation state of phosphorus (ii) Presence of two –OH groups and one P–H bond (iii) Presence of one –OH group and two P–H bonds (iv) High electron gain enthalpy of phosphorus ...
(i) N2O, PbO (ii) NO2, PbO (iii) NO, PbO (iv) NO, PbO2 Correct Answer: (ii) NO2, PbO Explanation: Reaction Involved - 2Pb(NO3)2 → 2PbO + 4NO2 + O2
(i) Nitrogen (ii) Bismuth (iii) Antimony (iv) Arsenic Correct Answer: (i) Nitrogen Explanation: The element that do not show allotropy is Nitrogen.
(i) 3 (ii) 5 (iii) 4 (iv) 6 Correct Answer: (iii) 4 Explanation: Maximum covalency of nitrogen is 4.
(i) Single N–N bond is stronger than the single P–P bond. (ii) PH3 can act as a ligand in the formation of a coordination compound with transition elements. (iii) NO2 is paramagnetic. (iv) Covalency...
Answer: \[Option\text{ }\left( A \right)\text{ }0\]
(i) [Fe(H2O)5 (NO)]2+ (ii) FeSO4.NO2 (iii) [Fe(H2O)4 (NO)]2+ (iv) FeSO4.HNO3 Correct Answer: (i) [Fe(H2O)5 (NO)]2+ Explanation: A brown ring is formed in the ring test for NO3– ion. It is...
(i) Bi2O5 (ii) BiF5 (iii) BiCl5 (iv) Bi2S5 Correct Answer: (ii) BiF5 Explanation: Due to the inert pair effect bismuth only exhibit +3 oxidation state and form trihalides. But due to the size...
(i) N2 in both cases (ii) N2 with ammonium dichromate and NO with barium azide (iii) N2O with ammonium dichromate and N2 with barium azide (iv) N2O with ammonium dichromate and NO2 with barium azide...
(i) A compound statement is made up of two or more statements (Components). As a result, the components of the given statement 7are a rational or irrational number, respectively. p: √7is a rational...
Answer: \[Option\text{ }\left( C \right)\text{ }1\]
Answer: Option (D) \[None\text{ }of\text{ }these\]
(i) A compound statement is made up of two or more statements (Components). As a result, the elements of the provided statement "Number 7 is prime and odd" are as follows: p: The number 7 is prime....
Option \[\left( B \right)\text{ }3\] According to the question, the area of a triangle with vertices \[({{x}_{1}},\text{ }{{y}_{1}}),\text{ }({{x}_{2}},\text{ }{{y}_{2}})\text{ }and\text{...
ANSWER: Option \[\left( C \right)~{{a}^{3}}~+~{{b}^{3}}~+~{{c}^{3}}~\text{ }3abc\] Given,
ANSWER: Option \[~\left( C \right)\text{ }\pm \text{ }6\] On equating the determinants, we get \[2{{x}^{2}}-\text{ }40\text{ }=\text{ }18\text{ }+\text{ }14\] \[2{{x}^{2}}~=\text{ }72\]...
Answer: According to the question, the determinant can be solved as
Answer: According to the question, the determinant can be solved as
Answer: According to the question, the determinant can be solved as
Answer: According to the question, the determinant can be solved as
Answer: Given equations are: \[3x~+\text{ }2y-\text{ }2z~=\text{ }3\] \[x~+\text{ }2y~+\text{ }3z~=\text{ }6\]and \[2x~-y~+~z~=\text{ }2\] Or, \[AX\text{ }=\text{ }B\]
The curve y = –x2 or x2 = –y and the line x + y + 2 = 0 Solving the two equation, we get \[x\text{ }-\text{ }{{x}^{2}}~+\text{ }2\text{ }=\text{ }0\] \[{{x}^{2}}~\text{ }-x\text{ }\text{ }-2\text{...
Answer: According to the question, the determinant can be solved as
Answer: According to the question, the determinant can be solved as
Answer: According to the question, the determinant can be solved as
Given focuses are \[\left( a\text{ }+\text{ }5,\text{ }a\text{ }\text{ }4 \right),\text{ }\left( a\text{ }\text{ }2,\text{ }a\text{ }+\text{ }3 \right)\]and \[\left( a,\text{ }a \right).\]...
Answer: According to the question, the determinant can be solved as So, it is independent of r.
Answer: According to the question, the determinant can be solved as
Answer: According to the question, the determinant can be solved as
Given, \[2y~=\text{ }5x~+\text{ }7,~x-axis,~x~=\text{ }2\text{ }and~x~=\text{ }8\] graphg for: \[2y~=\text{ }5x~+\text{ }7\text{ }\Rightarrow \text{ }y\text{ }=\text{ }\left( 5x\text{ }+\text{ }7...
Answer: According to the question, the determinant can be solved as
Answer: According to the question, the determinant can be solved as
The equation of line x = 2 and parabola y2 = 8x Putting value of x in the other equation, we have \[\begin{array}{*{35}{l}} {{y}^{2}}~=\text{ }8\left( 2 \right) \\ {{y}^{2}}~=\text{ }16 \\...
Solution: The electronic setup of chromium and zinc are separately: \[\begin{array}{*{35}{l}} Cr\text{ }\left( 24 \right)\text{ }=\text{ }\left[ Ar \right]\text{ }3d54s2 \\ ~Zn\text{ }\left(...
Answer: According to the question, the determinant can be solved as
Answer: According to the question, the determinant can be solved as
Answer: According to the question, the determinant can be solved as
Answer: According to the question, the determinant can be solved as Now, expanding along\[R1\], we have \[=\text{ }\left( a\text{ }+\text{ }b\text{ }+\text{ }c \right)\text{ }[1\text{ }x\text{...
Answer: According to the question, the determinant can be solved as
(i) Both assertion and reason are true and the reason is the correct explanation of assertion. (ii) Both assertion and reason are true but the reason is not the correct explanation of assertion....
(i) Both assertion and reason are true and the reason is the correct explanation of assertion. (ii) Both assertion and reason are true but the reason is not the correct explanation of assertion....
Answer: [Expanding along first column] \[=\text{ }\left( x\text{ }+\text{ }y\text{ }+\text{ }z \right)\text{ }.\text{ }1\left[ 3y\left( 3z\text{ }+\text{ }x \right)\text{ }+\text{ }\left(3z...
(i) Both assertion and reason are true and the reason is the correct explanation of assertion. (ii) Both assertion and reason are true but the reason is not the correct explanation of assertion....
(i) Both assertion and reason are true and the reason is the correct explanation of assertion. (ii) Both assertion and reason are true but the reason is not the correct explanation of assertion....
(i) Both assertion and reason are true and the reason is the correct explanation of assertion. (ii) Both assertion and reason are true but the reason is not the correct explanation of assertion....
Answer: According to the question, the determinant can be solved as
Answer: According to the question, the determinant can be solved as
Answer: \[=\text{ }({{x}^{2}}-\text{ }2x\text{ }+\text{ }2)\text{ }.\text{ }\left( x\text{ }+\text{ }1 \right)\text{ }-\text{ }\left( (x)\text{ }-\text{ }1 \right)\text{ }.\text{ }0\] \[=\text{...
Solution:
Solution:
Column I Column II (A) Pendulum (1) Chrome steel (B) Malachite (2) Nickel steel (C) Calamine (3) Na3AlF6 (D) Cryolite (4) CuCO3.Cu(OH)2 (5) ZnCO3 Column I Column II (A) Pendulum (2)...
Column I Column II (A) Coloured band (1) Zone refining (B) Impure metal to volatile complex (2) Fractional distillation (C) Purification of Ge and Si (3) Mond Process (D) Purification of mercury (4)...
Column I Column II (A) Cyanide process (1) Ultrapure Ge (B) Froth Floatation Process (2) Dressing of ZnS (C) Electrolytic reduction (3) Extraction of Al (D) Zone refining (4) Extraction of Au ...
Column I Column II (A) Sapphire (1) Al2O3 (B) Sphalerite (2) NaCN (C) Depressant (3) Co (D) Corundum (4) ZnS (5) Fe2O3 Column I Column II (A) Sapphire (3) Co (B) Sphalerite (4) ZnS (C)...
Column I Column II (A) Blistered Cu (1) Aluminium (B) Blast furnace (2) 2Cu2O + Cu2S → 6Cu + SO2 (C) Reverberatory furnace (3) Iron (D) Hall-Heroult process (4) FeO + SiO2 → FeSiO3 (5) 2Cu2S...
at \[\mathbf{x}\text{ }=\text{ }\mathbf{4}\] And hence, f(x) is discontinuous at \[x\text{ }=\text{ }4.\]
at \[\mathbf{x}\text{ }=\text{ }\mathbf{2}\] And hence, f(x) is continuous at \[x\text{ }=\text{ }2.\]
at \[\mathbf{x}\text{ }=\text{ }\mathbf{2}\] And hence, f(x) is discontinuous at \[x\text{ }=\text{ }2.\]
Reactions Involved: 4Au(s) + 8CN-(aq) + 2H2O(aq) + O2(g) → 4[Au(CN)2]-(aq) + 4OH-(aq) 2[Au(CN)2]-(aq) + Zn(s) → 2Au(s) + [Zn(CN)4]2- (aq) Role of Zinc in this reaction - Reducing...
Requirements for vapour phase refining: 1. Metal must react easily with a reagent to produce volatile complex. 2. The complex which is volatile should be easily decomposed and recovered.
Reactions Involved: 1. 3Fe2O3 + CO → 2Fe3O4 + CO2 2. Fe3O4 + CO → 3FeO + 2CO2 3. Fe2O3 + CO → 2FeO + CO2
1. Semiconductors are purified by the method of zone refining. 2. The refining of the surface depends on the principle that the impurities are more soluble in molten metal than solid metal. 3. The...
Role of flux in metallurgical processes: 1. To remove the gangue, certain substances are mixed with it. These are called fluxes. 2. Flux can be basic or acidic. 3. Flux which is acidic removes basic...
Considerations during the extraction of metals by electrochemical method: 1. The reactivity of the formed metal. 2. Electrodes must be made of suitable materials 3. To form a molten mass, flux is...
Reaction involved in the extraction of Cl2 from brine: 2Cl- (aq) + 2H2O(l) → 2OH- (aq) + H2(g) + Cl2(g) Calculation: ΔGᶱ = -nFE° ΔGᶱ = +422kJmol-1. E° = 422x103 / 2×96500 E° = - 2.2V For the...
The ∆G formation of FeO is a bit negative than the ∆G formation of carbon monoxide from carbon. Summation of both ∆G will be negative at about 1073K. Above 1073K the FeO production line exceeds the...
Limestone can be combined with flux to remove impurities of sulfur, silicon and phosphorus. They form an easily removable slag. The metal is removed from the slag by passing through the rollers....
Copper is extracted by hydrometallurgy method from the copper ores which are low graded. The Cu is treated with cast iron or H2 and is leached out by the acid. Reaction Involved: Cu2 (aq) + H2(g) →...
1. The metal must react easily with a reagent to produce complex. 2. The complex which is volatile must be easily decomposed and do not give off any additional products and recovery must also be...
Carbon and hydrogen will not reduce oxides into metals but will instead build hydrides and carbides. Thus, they are not used as the reducing agents.
The two sulphide ores competing with coming into the froth can be separated by adjusting the oil to the amount of water or by adding depressants such as NaCN. If we have two sulphide metals, ZnS and...
The iron ore which is used to line the reverberatory furnace is Haematite ore (Fe2O3). Example: In the following reaction, Haematite ore forms iron and CO. Fe2O3 + 3 C → 2 Fe + 3CO
Compound A does not absorb well in the column and moves down the column with alcohol i.e. eluant, while compound B is well absorbed in the column and cannot go down the column.
The copper sulphide ore is burned in the furnace after mixing with silica because the metal impurities present in it can form slag and silica and will be easily removed. Copper is produced as matte...
The Sulphide ores cannot be easily reduced so they are usually converted to oxides because the oxides can be easily reduced.
The Van Arkel method is used to filter Zr and Ti. Van Arkel's process involves heating the impure metal with Iodine. It builds a complex structure where it decomposes at high temperatures, restores...
(i) Cl–(aq.) →1/2Cl2 (g) + e– ; E°cell = 1.36V (ii) 2H2O(l) → O2(g0 + 4H+ + 4e- ; E°cell = 1.23V (iii) Na+(aq) + e- → Na(s) ; E°cell = 2.71V (iv) H+(aq) + e- → 1/2H2(g) ; E°cell = 0.00V ...
(i) Al3+ is oxidised to Al (s). (ii) graphite anode is oxidised to carbon monoxide and carbon dioxide. (iii) the oxidation state of oxygen changes in the reaction at the anode. (iv) the oxidation...
(i) Cu and Zn (ii) Ge and Si (iii) Zr and Ti (iv) Zn and Hg Correct Answer: (i) Cu and Zn Explanation: Electrolytic refining is used to purify Copper and Zinc metals.
(i) displacement of metal by some other metal from the complex ion. (ii) roasting of the metal complex. (iii) calcination followed by roasting. (iv) thermal decomposition of the metal complex....
(i) Below temperature at point A. (ii) Approximately at the temperature corresponding to point A. (iii) Above temperature at point A but below a temperature at point D. (iv) Above temperature at...
(i) be reduced by carbon monoxide only. (ii) be reduced by both carbon monoxide and carbon. (iii) be reduced by carbon only. (iv) not be reduced by both carbon and carbon monoxide. Correct...
(i) ∆G value for the overall reduction reaction with carbon monoxide is zero. (ii) ∆G value for the overall reduction reaction with a mixture of 1 mol carbon and 1 mol oxygen is positive. (iii) ∆G...
(a) C + O2 → CO2 (b) 2C + O2 → 2CO (c) 2CO + O2 → 2 CO2 (i) Point A (ii) Point B (iii) Point D (iv) Point E Correct Answers: (ii) Point B (iv) Point E Explanation: At the temperature...
(i) Cast iron is obtained by remelting pig iron with scrap iron and coke using hot air blast. (ii) In the extraction of silver, silver is extracted as cationic complex. (iii) Nickel is purified by...
(i) lower the melting point of Al2O3 (ii) increase the conductivity of molten mixture. (iii) reduce Al3+ into Al(s). (iv) acts as a catalyst Correct Answers: (i) lower the melting point of...
(i) Collectors enhance the non-wettability of the mineral particles. (ii) Collectors enhance the wettability of gangue particles. (iii) By using depressants in the process two sulphide ores can be...
(i) using collectors. (ii) adjusting the proportion of oil to water. (iii) using depressant. (iv) using froth stabilisers. Correct Answers: (ii) adjusting the proportion of oil to water....
(i) CuO (ii) ZnO (iii) Fe2O3 (iv) SiO2 Correct Answers: (iii) Fe2O3 (iv) SiO2 Explanation: Common impurities present in bauxite are Fe2O3 and SiO2
(i) Haematite (ii) Galena (iii) Copper pyrites (iv) Magnetite Correct Answers: (ii) Galena (iii) Copper pyrites Explanation: Galena and Copper pyrites are the ores which can be concentrated...
(i) CaCO3→CaO+CO2 (ii) 4FeS2+11O2→2Fe2O3+8SO2 (iii) 2Al(OH)3→Al2O3+3H2O (iv) Cu2S+2CuO→4Cu+SO2 Correct Answers: (i) CaCO3→CaO+CO2 (iii) 2Al(OH)3→Al2O3+3H2O Explanation:...
(i) haematite (ii) calamine (iii) iron pyrites (iv) sphalerite Correct Answers: (i) haematite (ii) calamine Explanation: Haematite and Calamine are the calcined ores which gets reduced by...
(i) Fe2O3 + 3CO → 2Fe + 3CO2 (ii) FeO + SiO2 → FeSiO3 (iii) Fe2O3 + 3C → 2Fe + 3CO (iv) CaO + SiO2 → CaSiO3 Correct Answers: (i) Fe2O3 + 3CO → 2Fe + 3CO2 (iv) CaO + SiO2 → CaSiO3 Explanation:...
(i) heating with a stream of carbon monoxide. (ii) heating with iodine. (iii) liquation. (iv) distillation. Correct Answers: (i) heating with a stream of carbon monoxide (ii) heating with...
(i) A depressant prevents a certain type of particle to come to the froth. (ii) Copper matte contains Cu2S and ZnS. (iii) The solidified copper obtained from the reverberatory furnace has blistered...
(i) ΔG° for the overall reaction is negative. (ii) ΔG° for the overall reaction is positive. (iii) E° for the overall reaction has a negative value. (iv) E° for the overall reaction has a positive...
at \[\mathbf{x}\text{ }=\text{ }\mathbf{0}\] NOW, HENCE, given function f(x) is discontinuous at \[x\text{ }=\text{ }0.\]
since, \[y\text{ }=\text{ }f\left( x \right)\] will be continuous at \[x\text{ }=\text{ }a\] if, hence, f(x) is continuous at $$ \[x\text{ }=\text{ }1.\]
(i) oxidation of Cl– ion to chlorine gas occurs. (ii) reduction of Cl– ion to chlorine gas occurs. (iii) For the overall reaction, ∆Gᶱ has a negative value. (iv) a displacement reaction takes place....
(i) sulphides of copper (II) and iron (II) (ii) sulphides of copper (II) and iron (III) (iii) sulphides of copper (I) and iron (II) (iv) sulphides of copper (I) and iron (III) Correct...
(i) Fe3O4 + 4CO → 3Fe + 4CO2 (ii) Cu2O + C → 2Cu + CO (iii) Cu2+ (aq) + Fe (s) → Cu (s) + Fe2+ (aq) (iv) Cu2O + 1/2Cu2S → 3Cu + 1/2SO2 Correct Answer: (iv) Cu2O + 1/2Cu2S → 3Cu + 1/2SO2...
(i) Al and Fe (ii) Al and Cu (iii) Fe and Cu (iv) Cu and Ag Correct Answer:(i) Al and Fe Explanation: The most abundant elements in the earth's crust are Aluminium (8.1 %) and Iron...
(i) FeS (ii) CO (iii) Cu2S (iv) SO2 Correct Answer: (iii) Cu2S Explanation: Reaction Involved - 2Cu2S+3O2 →2Cu2O+2SO2 2 Cu2O+ Cu2S →6Cu+ SO2
(i) impurities of low boiling metals can be separated by distillation. (ii) impurities are more soluble in molten metal than in solid metal. (iii) different components of a mixture are differently...
in the expansion of 
Given function is $\left(3 x-\frac{2}{x^{2}}\right)^{15}$ We know from the standard formula of $T_{r+1}$ we get, $\mathrm{T}_{r+1}={ }^{15} C_{r}(3 x)^{15-r}\left(\frac{-2}{x^{2}}\right)^{r}={...
When FeCl3 is dissolved in hot water, hydrated ferric oxide forms. This highly hydrated oxide hydrate adsorbs Fe3+ ions results in a positively charged colloid.
1. In physisorption, with increasing temperature, the bond between adsorbent and adsorbate weakens and the amount of adsorbate decreases. 2. In chemisorption, the amount of activation energy needed...
If dialysis continues for a long time, the electrolyte deposits present in the blood are also completely removed and blood coagulation is established.
The silver halide surface acts as a good adsorbent. It can be able to adsorb the pigment present in the eosin dye. So, the silver halide seems to be colored.
The activated charcoal works as a good adsorbent because it is porous. Because of this, in the coal mines, it is used to provide fresh air for the breathing purpose via a gas mask.
(i) R = 1 kΩ, C = 0.01µF (ii) R = 10 kΩ, C = 0.01µF (iii) R = 10 kΩ, C = 0.1µF Answer: Carrier wave frequency, fc – 20 MHz = 20 × 106 Hz Bandwidth = 2fm = 3 × 103 Hz fm = 1.5 × 103 Hz 1/fc = 0.5 ×...
(ii) Is the plot symmetrical about ωc? Comment especially about plot in region ω < ωc (iii) Extrapolate and predict the problems one can expect if more waves are to be modulated (iv) Suggest...
(i) the percentage modulation (ii) peak carrier voltage and (iii) peak value of information voltage Answer; Maximum voltage is given by $ {{V}_{\max }}=\frac{100}{2}=50V $ Minimum voltage is given...
Answer: According to the question, the velocity of waves = 3 × 108 m/s The time to reach a receiver = 4.04 × 10-3 s we know that the height of satellite is: h = 600 km And the radius of earth = 6400...
channel decreases exponentially with distance x according to the relation I = Ioe–αx, where I o is the intensity at x = 0 and α is the attenuation constant. Show that the intensity reduces by 75...
Answer: The total radiated power is due to ωc, (ωc – ωm) and (ωc + ωm) carrying energy. The carrier frequency is usually close to the sideband frequencies. In an amplitude modulated transmission,...
Answer: Expression fpor the maximum frequency is: fmax = 9(Nmax)1/2 According to the question, for Layer F1, fmax = 5 MHz $ {{N}_{\max }}=\frac{F_{\max }^{2}}{9\times 9}=\frac{5\times...
Answer: We know that the distance or range of transmission tower is given by the expression: $dT=\sqrt{2{{h}_{T}}R}$ R represents the radius of the earth (approximately 6400 km). hT denotes the...
(i) at ground level, (ii) at a height of 25 m? Calculate the percentage increase in area covered in case (ii) relative to case (i). Answer: We know that: $ {{R}_{e}}=6.4\times {{10}^{6}}m $ The...
Answer: It is given that there is a loss of signal 2dB per km. So total loss suffered in 5km = -2 x 5 = -10 dB. In both input and output amplifiers, the total gain of the signal is given by: =...
Answer: In an amplitude modulated wave, the carrier wave's instantaneous voltage varies. As a result, assuming noise as a part of the modulated signal, a noise signal can be added and received...
Answer: $ v=1MHz={{10}^{6}}Hz $ $ v=\frac{1}{2\pi \sqrt{LC}} $ $ Or,\sqrt{LC}=\frac{1}{2\pi v} $ $ LC=\frac{1}{{{(2\pi v)}^{2}}}=\frac{1}{4\times 3.14\times 3.14\times {{10}^{12}}} $ $...
Answer: The modulation index is the ratio of the change in carrier wave amplitude to the original carrier wave amplitude. according to the question, the maximum amplitude of AM wave is Amax = Ac +...
Answer: The refractive index rises as the frequency rises, implying that the angle of refraction is smaller for higher frequency waves. In other words, bending is less. As a result, after covering a...
Answer; Skywaves will not be suitable for transmitting TV signals with a frequency of 60 MHz since the TV signals are higher than 60 MHz. It is necessary to use space wave transmission.
(i) A vibrating tuning fork (ii) Musical sound due to a vibrating sitar string (iii) Light pulse (iv) Output of NAND gate Answer: i) A vibrating tuning fork will produce an analog signal ii) musical...
(a) m > 1, will result in interference between the carrier frequency and message frequency, resulting in distortion (b) m > 1 will result in overlapping of both sidebands resulting into loss...
(a) (i) followed by(ii) (b) (ii) followed by (i) (c) (iii) (d) (iv) Answer: The correct options are: (a) (i) followed by(ii) (b) (ii) followed by (i) (c) (iii) Explanation: The band pass filter...
(a) 100 km (b) 24 km (c) 55 km (d) 50 km Answer: The correct options are (b) 24 km (c) 55 km and (d) 50 km Explanation: $ {{h}_{T}}=240m $ $ R=6.4\times {{10}^{6}}m $ For, LOS communication we have:...
(a) The sideband frequencies are 1506 kHz and 1494 kHz (b) The bandwidth required for amplitude modulation is 6kHz (c) The bandwidth required for amplitude modulation is 3 MHz (d) The sideband...
(a) the size of the required antenna would be at least 5 km which is not convenient (b) the audio signal can not be transmitted through sky waves (c) the size of the required antenna would be at...
a) Ac sin [{ωc + k1vm(t)}t + φ ] (b) Ac sin {ωc t + φ + k2 vm(t)} (c) {Ac + k2 vm(t)} sin (ωc t + φ ) (d) Ac vm(t) sin (ωc t + φ ) Answer: The correct option is (c) {Ac + k2 vm(t)} sin (ωc t + φ )...
(A) transmitter (B) information source (C) user of information (D) channel (E) receiver Choose the correct sequence in which these are arranged in a basic communication system: (a) ABCDE (b) BADEC...
a) poor selection of modulation index (selected 0 < m < 1) (b) poor bandwidth selection of amplifiers (c) poor selection of carrier frequency (d) loss of energy in transmission Answer: The...
Identify devices that can be used for modulation: (a) ‘i’ and ‘iii’ (b) only ‘iii’ (c) ‘ii’ and some regions of ‘iv’ (d) All the devices can be used. Answer: The correct option is (c) ‘ii’ and some...
(a) ωm (b) ωc (c) ωc + ωm/2 (d) ωc – ωm/2 Answer: The correct option is (b) ωc Explanation: Frequency of carrier wave = ωc Frequency of modulated wave = ωc
(a) 1.003 MHz and 0.997 MHz (b) 3001 kHz and 2997 kHz (c) 1003 kHz and 1000 kHz (d) 1 MHz and 0.997 MHz Answer: The correct option is (a) 1.003 MHz and 0.997 MHz Explanation: $ {{\omega...
(a) 900 W (b) 100 W (c) 990 W (d) 1010 W Answer: The correct option is (b) 100 W Explanation: According to the question, Pi =1 kW = 1000W The rate of attenuation of the signal = -2dB/km Length of...
(a) ~ 400 m (b) ~ 25 m (c) ~ 150 m (d) ~ 2400 m Answer: The correct option is (a) ~ 400 m Explanation: According to the question, the length of building ois l = 500m and Length of antenna is 100m...
(a) A is transmitted via space wave while B and C are transmitted via skywave (b) A is transmitted via ground wave, B via skywave and C via space wave (c) B and C are transmitted via ground wave...
Answer: Ie = Ic + Ib IcRc + Vce + IeRe = Vcc Rib + Vbe + IeRe = Vcc Ib = 11.5/200 mA Rc + Re = 1.56 kilo ohm Rc = 560 Ohm
Answer: $ {{I}_{C}}={{I}_{B}}+{{I}_{E}} $ $ {{I}_{B}}<<<{{I}_{C}} $ $ \therefore {{I}_{C}}={{I}_{E}} $ $ {{I}_{C}}=1mA(given) $ $ \therefore {{I}_{C}}={{I}_{E}}=1mA $ By Kirchhoff's loop...
Three components namely, two germanium diodes and one resistor are connected across these three terminals in some arrangement. A student performs an experiment in which any two of these three...
A B Y 0 0 0 0 1 1 1 0 1 1 1 0 It is represented by the following logic relation Build this gate using AND, OR, and NOT gates. Answer: In given logic relation Y = AˉB + ABˉ =Y1Y2 Now, the logic...
(i) Calculate the densities of the charge carriers in the n & p regions. (ii) Comment which charge carriers would contribute largely for the reverse saturation current when the diode is reverse...
. If 
= 
, it’s de Broglie wavelength at time t is given bya) 
b) 
c) 
d ) 
The correct answer is c)$ \frac{\lambda_{0}}{\sqrt{1+\frac{e^{2} E_{0}^{2} t^{2}}{m^{2} v_{0}^{2}}}} $ The de Broglie equation h=mv describes the relationship between a moving particle's momentum...
It’s de Broglie wavelength at time t is given bya) 
b) 
c) d) 
The correct answer is a) $\frac{\lambda_{0}}{1+\frac{e E_{0}}{m} \frac{t}{v_{0}}}$ The wave associated with moving particle is called matter wave or de-Broglie wave and it propagates in the form of...
Because the rate of reaction of compound ‘A' (C4H9Br) with aqueous KOH is solely determined by the concentration of compound ‘A,' the reaction happens via the SN1 mechanism, and product ‘A' is...
(i)A main halide is 1-bromobut-2-ene. (ii) Bromine is linked to the secondary carbon atom in 4-Bromopent-2-ene, making it a secondary halide. (iii) Bromine is linked to the tertiary carbon atom in...
Because electron density is higher at ortho and para locations, the functional groups contained in these compounds are ortho-para directed.
The molecule (B) will be the reaction's main product. This addition reaction is carried out according to Markovnikoff's rule, in which the hydrogen from the hydrogen halide is added to the carbon...
Br2 gas is produced when NaBr and H2SO4 are combined. Because of the stable molecule created as a result of resonance stabilisation, molecule (b) will not react with Br2 gas.
Because the symmetry of p-dibromobenzene allows the molecule to fit better in a crystal lattice, it has a higher melting point. As a result, breaking the bonds between the molecules needs a greater...
Option (i) and (iv) are the answers. Because the halogen atom is directly linked to the aromatic ring in compounds (i) and (iv), these compounds are classed as aryl halides.
Option (i) and (iii) are the answers. Dihalides with two halogen atoms linked to the same carbon atom are known as gem-dihalides. Gem-dihalides are formed when two halogen atoms are present on the...
Option (i) and (iii) are the answers. The SN1 mechanism is used in the given reaction. The production of carbocation is a gradual process in the SN1 mechanism. As a result, the pace of reaction is...
Option (iii) is the answer. The amount of electron releasing groups increases the reactivity of aryl halides; the fewer the electron releasing groups, the slower the rate of nucleophilic...
Option (i) is the answer. At least one chiral carbon must be present in the molecule to display racemic mixing. Chiral carbon is an asymmetric carbon that is linked to four distinct sorts of atoms...
Option (i) is the answer. The $S_N$ 1 mechanism operates in watery media. As a result of this reaction, a stable carbocation forms as an intermediate.
Chiral molecules are those that lack a plane of symmetry as well as a centre of symmetry.. It is a chiral molecule because it lacks the plane of symmetry and the centre of symmetry. Option (i) is...
Option (ii) is the answer. Diethylbromomethane's proper IUPAC designation is 3 - Bromopentane. $C_5H_{11}Br$ is the chemical formula for it.
Option (iii) is the answer. correct IUPAC name for given compound is 1-Bromo-2-methylbutane
Let consider AB be the width and C is any point on the circle with range r. \[\angle ACB\text{ }=\text{ }90o\] [angle in the semi-circle is 90o] Let \[AC\text{ }=\text{ }x\] Squaring on both the...
We should accept x be to the edge and r be the span of the circle. Surface space of 3D square \[=\text{ }6x2\] Also, surface space of the circle \[=\text{ }4\pi r2\] Presently, their total is...
Option (ii) is the answer. Alcohol reactivity towards halogen acids diminishes in the following order: (C) > (B) > (A) Because tertiary carbocation is the most stable of the three, it is...
We should believe x and y to be the length and expansiveness of given square shape ABCD. As per the inquiry, the square shape will be settled with regards to side AD which making a chamber with...
Leave x alone the length of the side of the square base of the cubical open box and y be its height Along these lines, the surface space of the open box
The given bend is \[\mathbf{x2}/\mathbf{a2}\text{ }+\text{ }\mathbf{y2}/\mathbf{b2}\text{ }=\text{ }\mathbf{1}\] and the straight-line \[\mathbf{x}\text{ }\mathbf{cos}\text{ }\mathbf{\alpha }\text{...
We should consider that the organization expands the yearly membership by \[\mathbf{Rs}\text{ }\mathbf{x}.\] Along these lines, x is the quantity of supporters who end the administrations. ...
Given, \[\mathbf{f}\text{ }\left( \mathbf{x} \right)\text{ }=\text{ }\mathbf{x5}\text{ }\text{ }\mathbf{5x4}\text{ }+\text{ }\mathbf{5x3}\text{ }\text{ }\mathbf{1}\] Separating the capacity,...
Option (ii) and (iii) are the answers. Benzylic alcohols, as we all know, are molecules with an alcohol functional group on a carbon atom that is directly linked to the Benzene ring. Because the –OH...
Let ∆ABC be the right-angled triangle in which \[\angle B\text{ }=\text{ }{{90}^{o}}\] Let \[\mathbf{AC}\text{ }=\text{ }\mathbf{x},\text{ }\mathbf{BC}\text{ }=\text{ }\mathbf{y}\] In this way,...
Option (i) is the answer As the moleculer mass of the alcohol grows, the boiling point rises. Furthermore, $1^0$ alcohols have greater boiling points than $2^0$ alcohols among isomeric alcohols.
ACCORDING TO QUES, HENCE FUNCTION has maximum value at \[x\text{ }=\text{ }\pi /6\] and maximum value is \[2.\]
Emulsion is the dispersion of one liquid into another invisible liquid. The dispersed phase is always available in lesser amount when compared to the dispersion medium.
Given, CURVE \[y\text{ }=\text{ }\text{ }x3\text{ }+\text{ }3x2\text{ }+\text{ }9x\text{ }\text{ }27\] Separating the two sides w.r.t. x, we get \[dy/dx\text{ }=\text{ }-\text{ }3x2\text{ }+\text{...
According to Hardy-Schulze law, electrolyte coagulation properties depend on the valency of coagulation ion. The higher the charge in flocculating ion the smaller the amount of electrolyte required...
Moist alum is highly charged with Al3+ and SO42-ions which activate the charged protein molecules present in the blood. This causes the blood protein to coagulate and stops bleeding.
Option (i) is the answer Because phenols are more acidic than alcohols, they will react with a sodium hydroxide solution in water.
Given, \[f\left( x \right)\text{ }=\text{ }tan1\left( sin\text{ }x\text{ }+\text{ }cos\text{ }x \right)\text{ }in\text{ }\left( 0,\text{ }\pi /4 \right).\] DIFFERENTIATING the two sides w.r.t. x, we...
The Cottrell precipitator is a filtering tool that removes fine particles such as dust and fumes from flowing electricity. It neutralizes the charge on carbon particles.
When the skin is soaked in tannin, coagulation occurs as a result of a combination of animal skin (positively charged) and tannin (negatively charged). Thus resulting in the hardening of the leather...
The colloidal solution has a larger surface area than the true solution. The surface area is directly proportional to the level of assimilation in our body. So, the drugs work effectively when...
1. Emulsifying agents stabilize the emulsion by forming interfacial film between the suspended particles and the dispersion medium. 2. Example: Agar (used in foods)
FeCl3 when dissolved in hot water, forms hydrated ferric oxide, a sol which is positively charged due to the absorption of Fe3+ ions. By adding NaCl, the negatively charged chloride ions reduce the...
ACCORDING TO QUES, \[f~\left( x \right)\text{ }=\text{ }\surd 3\text{ }sin~x\text{ }~cos~x\text{ }~2ax\text{ }+\text{ }b,\text{ }a~{}^\text{3}\text{ }1\] differentiating both sides w.r.t. x WE HAVE...
1. The Brownian motion occurs because of the collision between the colloidal particles and dispersion medium. 2. The movement causes the stability of the colloidal solution.
Given, \[f\text{ }\left( x \right)\text{ }=\text{ }2x\text{ }+\text{ }bed\text{ }1\text{ }x\text{ }+\text{ }log\text{ }\left[ \surd \left( 1\text{ }+\text{ }x2 \right)\text{ }\text{ }x...
When an electric field is applied to a colloidal solution, the colloidal particles move to different electrodes depending on their charge.
1. Alum is basically the potassium aluminum sulphate [KAl(SO4)2]. 2. When dissolved in alkaline bicarbonate it forms a gelatinous precipitate. 3. When added to water it attracts colloidal particles...
Collodion: 1. Collodion is a 4% solution of nitrocellulose prepared in a mixture of alcohol and ether. 2. Collodion is a solution which is syrupy in texture and can be inflammable.
Gelatin acts as an emulsifying agent for hydrophilic colloid. They absorb water content from ice cream and are also a good source of protein. They also give a soft texture and a glossy appearance to...
Given curve condition, \[y\text{ }=\text{ }b\text{ }.\text{ }e-x/an\] and line condition \[x/a\text{ }+\text{ }y/b\text{ }=\text{ }1\] Presently, let the directions of where the curve meets the...
Option (i) is the answer. Alcohols with the chemical formula $C_4H_{10}O$ can have a variety of structures. A similar chemical formula may be used to make a total of four alcohols. Butan-1-ol,...
Given, the condition of the bend is \[x2\text{ }+\text{ }y2\text{ }\text{ }2x\text{ }\text{ }4y\text{ }+\text{ }1\text{ }=\text{ }0\text{ }\ldots \text{ }..\text{ }\left( I \right)\] Separating both...
Given curve, \[3x2\text{ }\text{ }y2\text{ }=\text{ }8\] Separating the two sides w.r.t. x, we get \[6x\text{ }\text{ }2y.\text{ }dy/dx\text{ }=\text{ }0\Rightarrow -\text{ }2y\left( dy/dx...