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Class 12th Chemistry

Which one of the following statements is FALSE for hydrophilic sols?

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Payal Gupta

Contributor-Level 10

Viscosity of the hydrophilic sol is always higher than H₂O, because dispersed phase particle attracted by dispersion medium.

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Class 12th Communication Systems

Given below are two statements:

Statement I : A speech signal of 2 kHz is used to modulate a carrier signal of 1 MHz. The bandwidth.

Statement II : The side band frequencies are 1002 kHz and 998 kHz.

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

Side band frequencies are 1 MHz $\pm$ 1 kHz

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Class 12th Communication Systems

Given below are two statements:

Statement I : A speech signal of 2 kHz is used to modulate a carrier signal of 1 MHz. The bandwidth.

Statement II : The side band frequencies are 1002 kHz and 998 kHz.

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

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New answer posted

10 months ago

Class 12th Physics

Two coherent light sources having intensity in the ratio 2x produce an interference pattern. The ratio $\frac{I_{m a x} - I_{m i n}}{I_{m a x} + I_{m i n}}$ will be:

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Vishal Baghel

Contributor-Level 10

$\frac{l_{m a x}}{l_{m i n}} = \frac{{(\sqrt[]{\frac{l_{1}}{l_{2}}} + 1)}^{2}}{{(\sqrt[]{\frac{l_{1}}{l_{2}}} - 1)}^{2}} \Rightarrow \frac{l_{m a x} - l_{m i n}}{l_{m a x} + l_{m i n}} = \frac{2 . \sqrt[]{\frac{l_{1}}{l_{2}}}}{\frac{l_{1}}{l_{2}} + 1} = \frac{2 \sqrt[]{2 x}}{2 x + 1}$

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Class 12th Electric Charges and Fields

In an octagon ABCDEFGH of equal side, what is the sum of $\vec{A B} + \vec{A C} + \vec{A D} + \vec{A E} + \vec{A F} + \vec{A G} + \vec{A H},$ if,

$\vec{A O} = 2 \hat{i} + 3 \hat{j} - 4 \hat{k}$

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Vishal Baghel

Contributor-Level 10

$\vec{A B} + \vec{A H} = \vec{A O}$

$\vec{A C} + \vec{A G} = 2 \vec{A O}$

$\vec{A D} + \vec{A F} = 3 \vec{A O}$

$\vec{A E} = 2 \vec{A O}$

Adding All,

$\vec{A B} + \vec{A C} + \vec{A D} + \vec{A E} + \vec{A F} + \vec{A G} + \vec{A H} = 8 \vec{A O} = 16 \hat{i} + 24 \hat{j} - 32 \hat{k}$

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Class 12th Physics

The current (i) at time t = 0 and t = $\infty$ respectively for the given circuit is:

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Vishal Baghel

Contributor-Level 10

At t = 0, no current flows through inductor.

$i = \frac{E}{\frac{6 * 9}{6 + 9}} = \frac{5 E}{18}$

At t = $\infty$ , current flows through circuit as if inductor is shorted.

$i = \frac{E}{\frac{5}{2} + \frac{4}{5}} = \frac{10 E}{33}$

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Class 12th Physics

The angular frequency of alternating current in a L-C- R circuit is 100 rad/s. The components connected are shown in the figure. Find the value of inductance of the coil and capacity of condenser.

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Vishal Baghel

Contributor-Level 10

Key is open.

$i_{r m s} = \frac{15}{60} = \frac{1}{4} A$

$20 = \frac{1}{4} * 100 * L \Rightarrow L = 0.8 H$

$10 = \frac{1}{4} . \frac{1}{100 C} \Rightarrow C = 2.5 * 1 0^{- 4} F = 250 μ F$

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Class 12th Dual Nature of Radiation and Matter

An α a particle and a proton are accelerated from rest by a potential difference of 220V. After this, their de Broglie wavelengths are $λ_{α} a n d λ_{P}$ respectively. The ratio $\frac{λ_{P}}{λ_{α}} i s :$

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Vishal Baghel

Contributor-Level 10

K = qV

$p = \sqrt[]{2 m k} = \sqrt[]{2 m q V}$

$λ = \frac{h}{p} = \frac{h}{\sqrt[]{2 m q V}}$

$\frac{λ_{p}}{λ_{α}} = \sqrt[]{\frac{m_{α}}{m_{p}} . \frac{q_{α}}{q_{p}}} = \sqrt[]{4 * 2} = 2 * 1.4 = 2.8$

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Class 12th Physics Electromagnetic Waves

The peak electric field produced by the radiation coming from the 8W bulb at a distance of 10m is $\frac{x}{10} \sqrt[]{\frac{μ_{0} c}{π}} \frac{V}{m} .$ The efficiency of the bulb is 10% and it is a point source. The value of x is…….

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Payal Gupta

Contributor-Level 10

$l = \frac{1}{2} c ε_{0} E_{0}^{2} \Rightarrow \frac{8}{4 π {(10)}^{2}} * \frac{1}{2} = \frac{1}{4} * c * \frac{1}{c^{2} μ_{0}} * E_{0}^{2} \Rightarrow E_{0} = \frac{2}{10} \sqrt[]{\frac{μ_{0} c}{π}} \Rightarrow x = 2$

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Class 12th Physics Electrostatic Potential and Capacitance

Two identical conducting spheres with negligible volume have 2.1 nC and 0.1 nC charges, respectively. They are brought into contact and then separated by a distance of 0.5m. The electrostatic force acting between the spheres is …………….* 10^-9N.

$[G i v e n : 4 π ε_{0} = \frac{1}{9 * 1 0^{9}} S I u n i t]$

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Payal Gupta

Contributor-Level 10

After contact, charges an each sphere will be

$\frac{q_{1} + q_{2}}{2} = 1 n c \Rightarrow F = \frac{k q_{1} q_{2}}{r^{2}} = 36 * 1 0^{- 9} N$

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