Class 12th

The incorrect statement about the imperfections in solids is:

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Density of solid decreases in Schottky defect and vacancy defect.
Density of solid increases in interstitial defect.
Density of solid remain unchanged in Frenkel defect.

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Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : Dacron is an example of polyester polymer.

Reason R : Dacron is made up of ethylene glycol and terephthalic acid monomers.

In the light of the above statements, choose the most appropriate answer from the options given below.

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Class 12th Physics Ncert Solutions Class 12th

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A telegraph line of length 100km has a capacity of $0.01 μ F / k m$ and it carries an alternating current at 0.5 kilo cycle per second. If minimum impedance is required, then the value of the inductance that need to be introduced in series is _________mH.

(if p = $\sqrt[]{10}$ )

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C = 10^-6 f

f = 0.5 * 10³ = 500

$z = \sqrt[]{x_{R}^{2} + {(x_{L} - x_{C})}^{2}}$

for minimum impedance :

x_L = x_C

$\Rightarrow ω^{2} = \frac{1}{L C}$

$\Rightarrow L = \frac{1}{π^{2}} = \frac{1}{10} * 1000 = 100 m H$

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In Friedel-Crafts alkylation of aniline, one gets

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Class 12th Physics Moving Charges and Magnetism

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Aniline show acid-base reaction with AlCl₃

aniline is a Lewis base while AlCl₃ acts as lewis acid.

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Class 12th Physics

(if p = $\sqrt[]{10}$ )

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A singly ionized magnesium atom (A = 24) ion is accelerated to kinetic energy 5 ke V, and is projected perpendicularly into a magnetic field B of the magnitude 0.5 T. The radius of path formed will be ________cm.

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$r = \frac{m v}{q B} = \frac{\sqrt[]{2 k m}}{q B}$

$\frac{\sqrt[]{2 * 5 * 1 0^{3} * 1.6 * 1 0^{- 19} * 24 * 1.66 * 1 0^{- 27}}}{1.6 * 1 0^{- 19} * \frac{1}{2}}$

= 9.975 * 10^-2 cm

= 9.975 cm

$r \approx 10$ cm

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Two isomers (A) and (B) with molar mass 184 g/mol and elemental composition C, 52.2%; H. 4.9% and Br 42.9% gave benzoic acid and p-bromobenzoic acid respectively on oxidation with KMnO₄. Isomer 'A' is optically active and gives a pale yellow precipitate when warmed with alcoholic AgNO₃. Isomer 'A' and 'B' are respectively

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With AlCl₃, alkyl halide will form cabocation which will show rearrangement.

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Kindly consider the following

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Class 12th Physics Alternating Current

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An AC source is connected to an inductance of 100 mH, a capacitance of 100 $μ F$ and a resistance of 120 $Ω$ as shown in figure. The time in which the resistance having a thermal capacity 2 J/°C will get heated by 16°C is________ s.

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Contributor-Level 9

$x_{R} = 120 Ω$

$x_{L} = ω L = 100 * 100 * 1 0^{- 3} 10 Ω$

$x_{C} = \frac{1}{ω c} = \frac{1}{100 * 100 * 1 0^{- 6}} = 100 Ω$

$z = \sqrt[]{12 0^{2} + {(100 - 10)}^{2}} = \sqrt[]{12 0^{2} + 9 0^{2}}$

= 150 $Ω$

$\Rightarrow 32 = \frac{160}{75} * t \Rightarrow t = \frac{32 * 75}{160} = 15$

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Class 12th Physics

Current measured by the ammeter (A) in the reported circuit when no current flows through $10 Ω$ resistance, will be A.

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