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Class 11th Physics

Match Column -I and Column - II and choose the correct match from the given choices.

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alok kumar singh

Contributor-Level 10

Root mean square speed of gas molecules

$ν_{rms} = \sqrt[]{\frac{3 R T}{M}}$

Pressure exerted by ideal Gas

$P = \frac{1}{3} ρ v_{r m s}^{2}$

$P = \frac{1}{3} m n ν^{2}$

$ρ = m n, v_{r m s}^{2} = ν^{- 2}$

Average kinetic energy of a molecular

$K E = \frac{3}{2} K T$

Total internal energy of 1 mole of a diatomic gas

$U = \frac{f}{2} μ R T$

$U = \frac{5}{2} R T$ (For 1 mole diatomic gas)

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Class 11th Physics Mechanical Properties of Fluids

The velocity of a small ball of mass $M$ and density $d$ , when dropped in a container filled with glycerine becomes constant after some time. If the density of glycerine is $\frac{d}{2}$ , then the viscous force acting on 2 the ball will be:

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alok kumar singh

Contributor-Level 10

Mass $= M$

Density of ball $= d$

Density of glycerine $= \frac{d}{2}$

$F_{B} = V_{s} ρ_{l} g = V \frac{d}{2} g$

$F_{g} = M g = v d g$

For constant velocity, $F_{net} = 0$

$∴ F_{B} + F_{v} = M g$

$F_{V} = M g - F_{B} = V d g - \frac{V d g}{2} = \frac{V d g}{2} = \frac{M g}{2}$

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Class 11th Physics Gravitation

The volume occupied by the molecules contained in 4.5Kg water at STP, if the intermolecular forces vanish away is :

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Raj Pandey

Contributor-Level 9

$\begin{array}{r} V = (no. of moles) (22.4 litre) \\ = \frac{mass}{molar mass} (22.4 * 10^{- 3} m^{3}) \\ = \frac{4.5 * 10^{3}}{18} * 22.4 * 10^{- 3} m^{3} \\ = 5.6 m^{3} \end{array}$

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Class 11th physics ncert solutions class 11th

Two pendulums of length 121cm and 100cm start vibrating in phase. At some instant, the two are at their mean position in the same phase. The minimum number of vibrations of the shorter pendulum after which the two are again in phase at the mean position is :

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Raj Pandey

Contributor-Level 9

(n) $(1.1) = (n + 1)$

$0.1 (n) = 1$

$n = 10$

Required number of oscillation $= n + 1 = 10 + 1 = 11$

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Class 11th Equilibrium

What mass of 95% pure CaCO₃ will be require neutralise 50 mL of 0.5M HCl solution according to the following reaction?
CaCO₃(s) + 2HCl(aq) → CaCl₂(aq) + CO₂(g) + 2H₂O(l) [Calculate upto second place of decimal point]

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Vishal Baghel

Contributor-Level 10

Moles of HCl = (50 / 1000) * 0.5 = 0.025 moles
So, moles of CaCO? used = 0.025 / 2 = 0.0125 moles = 1.25 g
95% (Total mass of CaCO? ) = 1.25 g
Total mass of CaCO? = 1.25 / 0.95 = 1.32 g

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Class 11th Physics Oscillations

A series LCR circuit with inductance $10 H$ , capacitance $10 μ F$ , resistance $50 Ω$ is connected to an ac source of voltage, $V = 200 s i n ? (100 t)$ volt. If the resonant frequency of the LCR circuit is $v_{0}$ and the frequency of the ac source is $v$ , then

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Raj Pandey

Contributor-Level 9

$ω = 100$

$v = \frac{ω}{2 π} = \frac{100}{2 π} = \frac{50}{π} H z$

Resonance frequency

$v_{0} = \frac{1}{2 π \sqrt[]{L C}} = \frac{1}{2 π} \sqrt[]{\frac{1}{10 * 10 * 10^{- 6}}}$

$= \frac{50}{π} H z$

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Class 11th Chemistry

Which one is not correct mathematical equation for Dalton's Law of partial pressure? Here p = total pressure of gaseous mixture.

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Vishal Baghel

Contributor-Level 10

p? = p? x? is not a correct form of Dalton's law of partial pressures.

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Class 11th Chemistry

Amongst the following which one will have maximum lone pair -lone pair' electron repulsions?

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Vishal Baghel

Contributor-Level 10

Maximum lone pair - lone pair repulsions are there in XeF?

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Class 11th Physics

A Wheatstone bridge is used to determine the value of unknown resistance X by adjusting the variable resistance Y as shown in the figure. For the most precise measurement of X, the resistance P and Q