Class 12th

There is a sentence that is missing in the paragraph below. Look at the paragraph and decide in which blank (option 1, 2, 3, or 4) the following sentence would best fit.

Sentence: This doesn't mean you won't ever be able to access it

ChatGPT is still free to use. (1)__________. Because of the stir its advanced capabilities have made, many people are flocking to use it. (2)___________. The website operates using a server, and when too many people hop onto the server, it overloads and can't process your request. (3)___________. It just means you should try visiting the site at a later time when fewer people are trying to access the serve

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Class 12th Dual Nature of Radiation and Matter

Contributor-Level 10

The sentence before 3^rd states a problem related to ChatGPT and the given statement provides a solution.

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8 months ago

The radiation corresponding to 3->2 transition of a hydrogen atom falls on a gold surface to generate photoelectrons. These electrons are passed through a magnetic field of 5 * 10^-4 T. Assume that the radius of the largest circular path followed by these electrons is 7mm, the work function of the metal is: (Mass of electron = 9.1 * 10^-31 kg)

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Contributor-Level 10

$h ν = 3.4 - 1.51 = 1.89 e V$

As we know that radius of circular path in magnetic field is given as

$r = \frac{\sqrt[]{2 m K}}{q B} \Rightarrow K = \frac{r^{2} q^{2} B^{2}}{2 m}$

$\Rightarrow K = \frac{{(7 * 1 0^{- 3})}^{2} * (1.6 * 1 0^{- 19}) * {(5 * 1 0^{- 4})}^{2}}{2 * 9.1 * 1 0^{- 31}} e V = 107.7 * 1 0^{- 2} e V$ = 1.08 eV

$\Rightarrow ? = h ν - K = 1.89 - 1.08 = 0.81 e V$

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8 months ago

There is a sentence that is missing in the paragraph below. Look at the paragraph and decide in which blank (option 1, 2, 3, or 4) the following sentence would best fit.

Sentence: Therefore, over time, there will be more copies of these mutants than other molecules.

(1)____________.The “RNA world” hypothesis suggests that early life may have used RNA as material for both genes and replication before the emergence of DNA and proteins. (2)___________. Once an information system can make copies of itself, natural selection kicks in. (3)_________. Some of the new copies of these molecules (which some would call “genes”) will

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Contributor-Level 10

The given sentence concludes the statement given before the 4^th blank. Hence, it meaningfully fits in the 4^th blank only.

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8 months ago

Class 12th Physics

The value of current in the $6 Ω$ resistance is:

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Contributor-Level 10

Method-I : Using Kirchhoff's Law for loop $\vec{B D A B B},$ we can write

$- 140 + 20 l + 6 l_{1} = 0 \Rightarrow 10 l + 3 l_{1} = 70 . . . . . . . (i)$

Using Kirchhoff's Law for loop $\vec{A C B B A},$

we can write

$5 (l - l_{1}) + 90 - 6 l_{1} = 0$

->-5l + 11l₁ = 90 .(ii)

Adding equation (1) with twice the equation (2), we have

$25 l_{1} = 250 \Rightarrow l_{1} = \frac{250}{25} = 10 A$

Method-II : Using concept of equivalent cell, we can write

$V_{A B} = \frac{\frac{140}{20} + \frac{0}{6} + \frac{90}{5}}{\frac{1}{20} + \frac{1}{6} + \frac{1}{5}} = \frac{2100 + 0 + 5400}{15 + 50 + 60}$

$= \frac{7500}{125} = 60 V o l t$

$\Rightarrow l_{1} = \frac{60}{6} = 10 A$

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8 months ago

Four jumbled up sentences, related to a topic, are given below. Three of them can be put together to form a coherent paragraph. Identify the odd one out.

1. There is a huge range of electronic options as well as the traditional paper-based route.

2. It provides an opportunity to explore multiple topics and ideas.

3. You could, for example, use a diary app such as Penzu, which claims to take security very seriously, try a note-taking app like Google Keep, or just record your thoughts in a Word document stored on your laptop or in the cloud.

4. You could even go 'open' and keep a blog, sharing your thoughts with the world, and not just y

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Can I apply for supplementary exams of CBSE class 12th for 3 subjects?

Contributor-Level 10

Here, 1, 3 and 4 seem to be talking about diary writing and methods that can be adopted to do the same. 2 seems odd here.

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8 months ago

Class 12th CBSE

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Prabhjot Singh

Beginner-Level 5

No you can't apply for 3 supplementary exam because CBSE allow only for 2 subjects

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8 months ago

Class 12th Physics Nuclei

A radioactive material decays by simultaneous emissions of two particles with half lives of 1400 years and 700 years respectively. What will be the time after which one third of the material remains? (Take In 3 = 1.1)

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Contributor-Level 10

As we know that equivalent half life of radioactive material decays by simultaneous emissions, is given as

$\frac{1}{T} = \frac{1}{T_{1}} + \frac{1}{T_{2}} = \frac{1}{700} + \frac{1}{1400} = \frac{3}{1400} \Rightarrow T = \frac{1400}{3} y e a r s$

$\Rightarrow t = \frac{l n (3)}{λ} = \frac{l n (3)}{l n (2)} T = \frac{1.1}{0.693} * \frac{1400}{3} \approx 740.74 y e a r s$

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8 months ago

Four jumbled up sentences, related to a topic, are given below. Three of them can be put together to form a coherent paragraph. Identify the odd one out.

1. If you have more words at your order, you have a fat bank, words in abundance. You can do well in writing as well as speaking and be notably better than the trench of humankind.
2. The English, though hybrid, is an intriguing amalgamation of different dialects. It openly acquires from every other language of the world.
3. Words in the hands of a magician of vocabulary have warmth, colour and variety which express human feelings that lie buried in layers of the mind.
4. They are the m

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Contributor-Level 10

Other than 4^th, all the sentences talk about problems associated with water usage.

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8 months ago

Four jumbled up sentences, related to a topic, are given below. Three of them can be put together to form a coherent paragraph. Identify the odd one out.

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Contributor-Level 10

The second sentence talks about the English language while the rest talk about the power of words.

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8 months ago

Class 12th Physics Nuclei

A nucleus of mass M emits $γ -$ rays photon of frequency 'v'. The loss of internal energy by the nucleus is : [Take 'c' as the speed of electromagnetic wave]

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