Class 12th

Contributor-Level 10

The spectrum of H-atom is formulated and drawn by Bohr's model. These spectrums are line spectrum. Lyman series lies in UV region, Balmer Partly lies UV and partly in the visible region and Paschen series lies in the infrared region.

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The compound which is most easily soluble in aqueous alkali is

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Contributor-Level 10

Sodium phenoxide is resonance stabilized hence phenol is most easily soluble in aqueous alkali.

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Class 12th Physics

Statement A: In intrinsic semiconductors, conductivity is mainly due to the breakage of covalent bonds.

Statement B: In extrinsic semiconductors, the conductivity is mainly due to the addition of impurities.

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Contributor-Level 10

In intrinsic semiconductors, conductivity is mainly due to breakage of covalent bonds in extrinsic semiconductors, the conductivity is due to the addition of impurities.

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Class 12th Physics

An AND gate can be prepared by repetitive use of

a) NOT gate (b) OR gate (c) NAND gate (d) NOR gate

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Class 12th Environmental chemistry

Contributor-Level 10

On repetitive use of NAND GATE or NOR gate, any logic GATE can be prepared.

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Which of the following is not a common component of photochemical smog?

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So₂ is the component of classical smog.

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3 months ago

Consider the following statements

(I) Histamine is a potent vasodilator

(II) Brompheniramine is an antihistamine

(III) Tranquilizers and analgesics are neurologically active drugs

The correct statements among the following are

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Contributor-Level 10

Brompheniramine (Dimetapp) acts as antihistamine

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3 months ago

Identify the incorrect statement.

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Contributor-Level 10

High density polythene is chemically inert

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Class 12th Physics

A rectangular coil of wire of $500$ turns of area $10 * 5 c m^{2}$ carries a current of $2 A$ in a magnetic field of induction $2 * 10^{- 3} T$ . If the plane of the coil is parallel to the field. The torque on the coil is $(i n N m)$

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Contributor-Level 10

Torque on a bar magnet in external uniform magnetic field is

$\overset{?}{τ} = \overset{?}{M} * \overset{?}{B}$

$\overset{?}{τ} = N I A B \sin ? 90^{0}$

$= 500 * 2 * 50 * 10^{- 4} * 2 * 10^{- 3}$

$= 0.01 N m$

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3 months ago

Nitroethane when heated above 573 K yields

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