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Class 11th Physics

A student is performing the experiment of resonance column. The diameter of the column tube is 6cm. THE Frequency of the tuning fork is 504 Hz. Speed of the sound at the given temperature is 336m/s. The zero of the meter scale coincides with tip end of the resonance column tube. The reading of the water level in the column when the first resonance occurs is:

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Vishal Baghel

Contributor-Level 10

For first resonance,

$l + 0.3 d = \frac{v}{4 f}$

$\Rightarrow l + 0.3 * 6 = \frac{336 * 100}{4 * 504} \Rightarrow l = 14.8 c m$

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Class 11th Structure of Atom

The Plots of radial distribution functions for various orbitals of hydrogen atom against 'r' are given below:

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alok kumar singh

Contributor-Level 10

For 3S number of radial nodes are

= $n - l - 1 = 3 - 0 - 1 = 2$

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a year ago

Class 11th Physics

If the time period of a two meter long simple pendulum is 2s, the acceleration due to gravity at the place where pendulum is executing S.H.M. is:

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Vishal Baghel

Contributor-Level 10

$T = 2 π \sqrt[]{\frac{l}{g}}$

$\Rightarrow 2 = 2 π \sqrt[]{\frac{2}{g}}$

$\Rightarrow g = 2 π^{2} m / s^{2}$

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Class 11th Chemistry

The solubility of Ca(OH)₂ in water is:

[Given : The solubility product of Ca(OH)₂ in water = 5.5 * 10^-6]

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Payal Gupta

Contributor-Level 10

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Class 11th Thermodynamics

A diatomic gas, having C_P $= \frac{7}{2} R a n d C_{V} = \frac{5}{2} R,$ is heated at constant pressure. The ratio dU : dQ : dW :

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Vishal Baghel

Contributor-Level 10

At constant pressure,

$d U = n C_{V} d T = n . \frac{5}{2} R d T$

$d Q = n C_{P} d T = n . \frac{7}{2} R d T$

dW = nRdT

dU : dQ : dW = 5 : 7 : 2

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Class 11th Chemistry Chemical Bonding and Molecular Structure

Which among the following species has unequal bond lengths?

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Payal Gupta

Contributor-Level 10

SF₄ has sp³d hybridization and one type is axial while other type is equatorial

SiF₄ has sp³ (all bonds are equal)

$B F_{4}^{-}$ has sp³ (all bonds are equal)

XeF₄ has sp³d² and shape is sq. planar (All bonds are equal)

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Class 11th Mechanical Properties of Fluids

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

Assertion A : When a rod lying freely is heated, no thermal stress is developed in it.

Reason R : On heating, the length of the rod increases.

In the light of the above statements, choose the correct answer from the options given below:

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Vishal Baghel

Contributor-Level 10

Thermal stress is developed on heating when expansion of rod is hindered.

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a year ago

Class 11th Units and Measurement

The pitch of the screw gauge is 1mm and there are 100 divisions on the circular scale. When nothing is put in between the jaws, the zero of the circular scale lies 8 divisions below the reference line. When a wire is placed between the jaws, the first linear scale division is clearly visible while 72^nd division on circular scale coincides with the reference line, The radius of the wire is:

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Vishal Baghel

Contributor-Level 10

$L C = \frac{1}{100} m m = 0.01 m m$

Zero error = +0.08 mm.

Diameter = 1 + 72 * 0.01 – 0.08 = 1.64 mm

Radius = 0.82 mm

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Class 11th Chemistry Organic Chemistry

Consider the following chemical reaction.

$H C \equiv C H \to_{2) C O, H C l, A l C l_{3}}^{1) R e d h o t F e t u b e, 873 K} P r o d u c t$

The number of sp² hybridized carbon atoms (s) present in the product is--------------.

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alok kumar singh

Contributor-Level 10

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New answer posted

a year ago

Class 11th Gravitation

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

Assertion A : The escape velocities of planet Ad and B are same. But A and B are of unequal mass.

Reason R : The product of their mass and radius must be same. M₁ R₁ = M₂R₂

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

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Vishal Baghel

Contributor-Level 10

${(v_{e})}_{A} = {(v_{e})}_{B} \Rightarrow \frac{M_{1}}{R_{1}} = \frac{M_{2}}{R_{2}}$

R is not correct.

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