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Class 12th English

Mr. Deepak has five sons – Umesh, Vikash, Shivam, Raman and Riya, and three daughters – Tamanna, Kuntala and Janaki. Three sons of Mr. Deepak were born first followed by two daughters. Riya is the eldest child and Janki is the youngest. Three of the children are studying at Trinity School and three are studying at St. Stefan. Tamanna and Shivam study at St. Stefan School. Kuntala, the eldest daughter, plays chess. Mansorover School offers cricket only, while Trinity school offers chess, Beside, these schools offer no other games. The children who are at Mansorover School have been born in succession. Vikash and Raman are cricketers

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Payal Gupta

Contributor-Level 10

Ranking in born	Name	Game	School
1	Riya	Chess	Trinity
2	Vikash	Cricket	Mansorover
3	Raman	Cricket	Mansorover
4	Kuntala	Chess	Trinity
5	Tamanna		St. Stefan
6	Umesh	Football	St. Stefan
7	Shivam	Hockey	St. Stefan
8	Janki	Chess	Trinity

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11 months ago

Class 12th Communication Systems

A bandwidth of 6 MHz is available for A.M. transmission. If the maximum audio signal frequency used for modulating the carrier wave is not to exceed 6 kHz. The number of stations that can be broadcasted within this band simultaneously without interfering with each other will be_______.

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Vishal Baghel

Contributor-Level 10

Signal bandwidth = 12KHz

No. of station = $\frac{6 M H z}{12 k H z} = 500$

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11 months ago

Class 12th Physics

A resistor dissipates 192 J of energy in 1s when a current of 4A is passed4 through it. Now, when the current is doubled, the amount of thermal energy dissipated in 5s in________J.

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Vishal Baghel

Contributor-Level 10

Using Heat equation : H = i²Rt

=>192 = (4)² R (1)

H = (8)² R (5)

=>H = 3840 J

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New answer posted

11 months ago

Class 12th English

Directions for questions: Mr. Deepak has five sons – Umesh, Vikash, Shivam, Raman and Riya, and three daughters – Tamanna, Kuntala and Janaki. Three sons of Mr. Deepak were born first followed by two daughters. Riya is the eldest child and Janki is the youngest. Three of the children are studying at Trinity School and three are studying at St. Stefan. Tamanna and Shivam study at St. Stefan School. Kuntala, the eldest daughter, plays chess. Mansorover School offers cricket only, while Trinity school offers chess, Beside, these schools offer no other games. The children who are at Mansorover School have been born in succession. Vikas

...more

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Payal Gupta

Contributor-Level 10

Ranking in born	Name	Game	School
1	Riya	Chess	Trinity
2	Vikash	Cricket	Mansorover
3	Raman	Cricket	Mansorover
4	Kuntala	Chess	Trinity
5	Tamanna		St. Stefan
6	Umesh	Football	St. Stefan
7	Shivam	Hockey	St. Stefan
8	Janki	Chess	Trinity

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New answer posted

11 months ago

Class 12th English

Five people joined different engineering colleges. Their first names were Komal (Ms.), Mansi (Ms.), Kabeer, Ram and Rupali (Ms.). The surnames were Pandey, Kumar, Verma, Sharma and Gupta. Except for one college which was rated 3 star, all other colleges were rated either 4 star or 5 star.

The “Techno Institute” had a higher rating than college where Rupali studied. The three-star college was not “Decan College”. Ram's last name was Kumar but he didn't study at “Barla College.” Komal, whose last name wasn't Verma, joined “Techno Institute.” Ms. Sharma and Kabeer both studied at four-star colleges. Ms. Pandey studied at t

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Payal Gupta

Contributor-Level 10

Name	Surname	College	Star
Ram	Kumar	Chemical	4
Komal	Sharma	Techno	4
Rupali	Pandey	Anipal	3
Kabeer	Gupta	Deccan	4
Mansi	Verma	Barla	5

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11 months ago

Class 12th Physics Electric Charge and Field

Choose the incorrect statement :

(A) The electric lines of force entering into a Gaussian surface provide negative flux.

(B) A charge 'q' is placed at the centre of a cube. The flux through all the faces will be the same.

(C) In a uniform electric field net flux through a closed Gaussian surface containing no net charge, is zero.

(D) When electric field is parallel to a Gaussian surface, it provides a finite non-zero flux.

Choose the most appropriate answer from the options given below

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Vishal Baghel

Contributor-Level 10

When electric field is parallel then it would provide zero flux.

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11 months ago

Class 12th Physics Moving Charges and Magnetism

A current of 1.5 A is flowing through a triangle, of side 9cm each. The magnetic field at the centroid of the triangle is:

(Assume that the current is flowing in the clockwise direction.)

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Vishal Baghel

Contributor-Level 10

Using magnetic field due to straight wire :

$B = \frac{μ_{0} i}{4 π r} (s i n α + s i n β)$

$= \frac{1 0^{- 7} * 1.5}{(\frac{0.09}{2 \sqrt[]{3}})} * (s i n 60 ° + s i n 60 °) = 1 0^{- 5} T$

So, magnetic field due to three wires

= 3 * 10^-5 T

inside the plane

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11 months ago

Class 12th Ncert Solutions Maths class 12th

The integral $\int \frac{1}{} d x$ is equal to: (where C is a constant of integration)

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Raj Pandey

Contributor-Level 9

$\int \frac{d x}{{(\frac{x - 1}{x + 2})}^{3 / 4} {(x + 2)}^{3 / 4} {(x + 2)}^{5 / 4}} = \int \frac{d x}{{(\frac{x - 1}{x + 2})}^{3 / 4} {(x + 2)}^{2}} p u t \frac{x - 1}{x + 2} = t \Rightarrow \frac{3}{{(x + 2)}^{2}} d x = d t$

$∴ \frac{1}{3} \int \frac{d t}{t^{3 / 4}} = \frac{1}{3} . \frac{t^{1 / 4}}{\frac{1}{4}} + C = \frac{4}{3} {(\frac{x - 1}{x + 2})}^{1 / 4} + C$

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11 months ago

Class 12th Physics Electromagnetic Waves

Electric field of a plane electromagnetic wave propagating through a non-magnetic medium is given by E = $20 c o s (2 * 1 0^{10} t - 200 x) V / m .$ The dielectric constant of the medium is equal to:

(Take $μ_{r} = 1)$

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alok kumar singh

Contributor-Level 10

Comparing E = 20 cos (2 * 10¹⁰ t – 200x) V/m to

$E = E_{0} c o s (ω t - k x) v / m$

$ω = 2 * 1 0^{10}, K = 200$

Speed = $\frac{2 * 1 0^{10}}{200} = 1 0^{8} m / s$

R.I. $= \frac{C}{s p e e d} = \frac{3 * 1 0^{8}}{1 0^{8}} = 3$

$N o w R . I . = \sqrt[]{ε_{r} μ_{r}}$

$3 = \sqrt[]{ε_{r} * 1}$

$ε_{r} = 9$

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New answer posted

11 months ago

Class 12th NCERT Notes

Which chapters are most important in Class 12 Chemistry?

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Jaya Sinha

Beginner-Level 5

Students should prepare complete syllabus when they have time to prepare. However, you can use the list of highweightage chapters in last minute revision for scoring well.

The p-Block Elements: This chapter holds a high weightage of 8–10 marks. (in the latest syllabus this is deleted)
Aldehydes, Ketones, and Carboxylic Acids: This chapter contributes around 8–10 marks.
Biomolecules: This chapter accounts for around 8 marks.
Chemical Kinetics: This chapter holds a high weightage of 5-6 marks.
The d- and f-Block Elements: This chapter contributes around 5-6 marks.
Amines: This chapter contributes around 5-6 marks.

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