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11 months ago

Class 12th English

Directions for questions: Read the information carefully and answer the questions given below.

A company has seven tasks to complete. They are:

T1 – Buy raw material

T2 – Take orders

T3 – Process raw material

T4 – Deliver finish product

T5 – Hire new recruits

T6 – Pay the bills

T7 – Pay salary

And to do these tasks it has only two days, Monday and Tuesday. Certain conditions should be followed:

The Company must do at least two tasks each day.

The company cannot start its task on Monday with T4 (deliver finish product)

Task T1 should be done either in the beginning or at the end of any of the two days. Task T3 and tas

...more

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Payal Gupta

Contributor-Level 10

Only option (d) does not violate any of the given conditions.

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11 months ago

Class 12th Physics Wave Optics

The light waves from two coherent sources have same intensity I₁ = I₂ = I₀. In interference pattern the intensity of light at minima is zero. What will be the intensity of light at maxima?

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alok kumar singh

Contributor-Level 10

Kindly go through the solution

$l_{m a x} = {(\sqrt[]{l_{1}} + \sqrt[]{l_{2}})}^{2} = 4 l_{0}$

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11 months ago

Class 12th Physics Moving Charges and Magnetism

A uniform conducting wire of length is 24a, and resistance R is wound up as a current carrying coil in the shape of an equilateral triangle of side 'a' and then in the form of a square of side 'a'. The coil is connected to a voltage source V₀. The ratio of magnetic moment of the coils in case of equilateral triangle to that for square is 1: $\sqrt[]{y}$ where y is…….

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Vishal Baghel

Contributor-Level 10

In triangle $N_{t} = \frac{240}{3 a} = 8$ $_{} \frac{}{}$

In square Ns = $\frac{24 a}{4 a} = 6$ $\frac{}{}$

$\frac{M_{t}}{M s} = \frac{N_{t} l A_{t}}{N s l A s} = \frac{8 * \frac{\sqrt[]{3}}{4} * a^{2}}{6 * a^{2}} \Rightarrow M t / M s = \frac{1}{\sqrt[]{3}} \Rightarrow y = 3$

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11 months ago

Class 12th Physics

The alternating current is given by

$i = {\sqrt[]{42} s i n (\frac{2 π}{T} t) + 10} A$

The r.m.s. value of this current is……….A.

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Vishal Baghel

Contributor-Level 10

$f_{r m s}^{2} = {(\frac{\sqrt[]{42}}{\sqrt[]{2}})}^{2} + 1 0^{2} = 121$

$\Rightarrow f_{r m s} = 11 A$

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11 months ago

Class 12th Physics Ray Optics and Optical Instruments

Curved surfaces of a plano-convex lens of refractive index $μ_{1}$ and a plano-concave lens of refractive index $μ_{2}$ have equal radius of curvature as shown in figure. Find the ratio of radius of curvature to the focal length of the combined lenses

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alok kumar singh

Contributor-Level 10

$\frac{1}{f_{1}} = (μ_{1} - 1) (\frac{1}{\infty} - \frac{1}{(- R)}) = \frac{μ_{1} - 1}{R}$

$\frac{1}{f_{2}} = (μ_{2} - 1) [\frac{1}{(- R)} - \frac{1}{\infty}] = - \frac{μ_{2} - 1}{R}$

$\frac{1}{f_{e q}} = \frac{1}{f_{1}} + \frac{1}{f_{2}} = \frac{μ_{1} - μ_{2}}{R}$

$\Rightarrow \frac{R}{f_{e q}} = μ_{1} - μ_{2}$

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11 months ago

Class 12th Physics

First, a set of n equal resistors of 10 $Ω$ each are connected in series to a battery of emf 20V and internal resistance 10 $Ω$ . A current I is observed to flow. Then, the n resistors are connected in parallel to the same battery. It is observed that the current is increases 20 times, then the value of n is………

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Vishal Baghel

Contributor-Level 10

In series Req = nR = 10n

$\Rightarrow l s = \frac{20}{10 + 10 n} = \frac{2}{1 + n}$

In parallel $\Rightarrow R_{e q} = \frac{10}{n}$ $_{} \frac{}{}$

$\Rightarrow \frac{l_{ρ}}{l_{s}} = 20 = \frac{2 n / 1 + n}{2 / 1 + n}$

n = 20

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11 months ago

Class 12th English

Directions for questions: Read the information carefully and answer the questions given below.

During the cultural festival of IIT Delhi six competitions were conducted. The cultural festival was inaugurated in the morning of 18th August, Wednesday and continued till 25th August. In the span of 8 days six competitions namely debate, folk dance, group dance, drama, singing, and group song, were organized along with various other cultural programs. The information available from the IIT Delhi is:

I. Only one competition was held in a day

II. Singing competition was not conducted on the closing day.

III. Group dance was conducted on

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Payal Gupta

Contributor-Level 10

From the given information: Data for competition from 18th August to 25th August (From Wednesday to Wednesday) From (V), no competition was held on 19th and 22nd (i.e. on Thursday & Sunday)

From (VI), Drama was held on 23rd

From (III) and (VII), Debate must have been held on 21st, Flash-p on 20th and Group song on 24th. From (II), Singing competition was held on 18th.

Hence, from this we can draw following result.

Date	Day	Competitio n
18	Wednesda y	Singing competition
19	Thursday	—
20	Friday	Group dance
21	Saturday	Debate
22	Sunday	—
23	Monday	Drama
24	Tuesday	Group song
25	Wednesda y	Folk dance

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11 months ago

Class 12th Communication Systems

A transmitting antenna has a height of 320 m and that of receiving antenna is 2000m. The maximum distance between them for satisfactory communication in line of sight mode is 'd'. The value of 'd' is……….km.

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Vishal Baghel

Contributor-Level 10

$d = \sqrt[]{2 R h_{T}} + \sqrt[]{2 R h_{R}}$

$\Rightarrow d m = (\sqrt[]{2 * 6400 * 1 0^{3} * 320} + \sqrt[]{2 * 6400 * 1 0^{3} * 2000})$

= 224 km

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11 months ago

Class 12th Physics

A circuit is arranged as shown in figure. The output voltage V0 is equal to………V.

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Vishal Baghel

Contributor-Level 10

$Δ V_{D 1} = Δ V_{D 2} = l * R = 0$

Since resistance is zero in forward bias.

=> V₀ = 5V

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New answer posted

11 months ago

Class 12th English

Seven friends Jai, Kishan, Gopal, Pritam, Pranay, Sumit and Sohan went on vacations to Goa, Paris, Tokyo, Bangladesh and Andaman & Nicobar Island. They traveled by air, sea or over land. All vacations took place between January and May. No two people went on vacation the same place at the time. However, two people went on vacation at two places.

I. In March and May two vacations took place. Also, two vacations were in Bangladesh.

II. Four people travelled over land. Two people travelled by ship. One person took a flight.

III. Kishan was not the first to go. He travelled over land.

IV. Pranay did not go in May. He went to Goa, whic

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Payal Gupta

Contributor-Level 10

We are not certain about Kishan and Sohan as either of them could have visited Bangladesh. We know that Sumit definitely went to Tokyo, but he is not among the given options.

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