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Class 12th Chemistry

In the following reaction:

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Vishal Baghel

Contributor-Level 10

Kindly consider the following figure

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Class 12th Chemistry

Match List I with List II

List I Polymers		List II Commercial names
A.	Phenol-formaldehyde resin	I.	Glyptal
B.	Copolymer of 1,3-butadiene and styrene	II.	Novolac
C.	Polyester of glycol and phtalic acid	III.	Buna-S
D.	Polyester of glycol and terephthalic acid	IV.	Dacron

Choose the correct answer from the options given below;

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alok kumar singh

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Class 12th Chemistry

The intermediate X, in the reaction

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Vishal Baghel

Contributor-Level 10

Reimer-Tiemann reaction.

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Class 12th Alcohols, Phenols and Ethers

The major product in the reaction

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Vishal Baghel

Contributor-Level 10

Base is tert-butoxide thus favours elimination with 3° alkyl halide and gives alkene

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Class 12th Chemistry

The IUPAC name of ethylidene chloride is:

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Vishal Baghel

Contributor-Level 10

Ethylidene chloride is

1, 1 Dichloro ethane.

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Class 12th Chemistry

The product formed in the following reaction.

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Vishal Baghel

Contributor-Level 10

Kindly consider the following figure

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Class 12th Physics

A teacher in his physics laboratory allotted an experiment ot determine the resistance (G) of a galvanometer. Students took the observations for $\frac{1}{3}$ deflection in the galvanometer. Which of the below is true for measuring value of G?

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Vishal Baghel

Contributor-Level 10

In galvanometer

$\Rightarrow (l - l_{g}) S = l_{g} G$

$\frac{I_{g}}{l} = \frac{S}{S + G}$

$\Rightarrow \frac{1}{3} = \frac{S}{S + G} \Rightarrow S + G = 3 S \Rightarrow G = 2 S$

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Class 12th Physics Ray Optics and Optical Instruments

The difference of speed of light in the two media A and B $(υ_{A} - υ_{B})$ is 2.6 * 10⁷ m/s. If the refractive index of medium B is 1.47, then the ratio of refractive index of medium B to medium A is : (Given : speed of light in vacuum c = 3 * 10⁸ ms^-1)

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Vishal Baghel

Contributor-Level 10

$μ_{B} = \frac{C}{v_{B}}$

$v_{B} = \frac{3 * 1 0^{8}}{1.47} = 20.408 * 1 0^{7}$

$v_{A} = 2.6 * 1 0^{7} + 20.408 * 1 0^{7} = 23 * 1 0^{7}$

$μ_{B} = \frac{C}{v_{B}} & μ_{A} = \frac{C}{v_{A}}$

= 1.127

$\approx 1.13$

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Class 12th Communication Systems

A signal of 100 THz frequency can be transmitted with maximum efficiency by:

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Vishal Baghel

Contributor-Level 10

Optical fibre frequency range is 1 THz to 1000 THz.

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Class 12th Physics

The photodiode is used to detect the optical signals. These diodes are preferably operated in reverse biased mode because:

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Vishal Baghel

Contributor-Level 10

Very small change in minority charge carriers produces high value of reverse bias current.

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