List of practice Questions

The ratio of the wavelengths of radiation emitted when an electron in the hydrogen atom jumps from the 4th orbit to the 2nd orbit and from the 3rd orbit to the 2nd orbit is:

To balance the chemical equation, the values of the coefficients x, y, z, and t must be: Zn(NO₃)₂ → ZnO + NO₂ + O₂

‘Don’t thank me too early’, Sadao said coldly. (The Enemy)
What inference is drawn about Sadao’s state of mind from the above line?

If \[ \frac{x^4}{(x^2+1)(x-2)} = f(x) + \frac{Ax+B}{x^2+1} + \frac{C}{x-2} \] then \( f(14) + 2A - B = \) ?

“Federal form of government is in direct contrast to the Unitary form of government.” Explain the statement.

In commensalism, two organisms have:

Let \( |\mathbf{a}| = 2, |\mathbf{b}| = 3 \) and the angle between \( \mathbf{a} \) and \( \mathbf{b} \) be \( \frac{\pi}{3} \). If a parallelogram is constructed with adjacent sides \( 2\mathbf{a} + 3\mathbf{b} \) and \( \mathbf{a} - \mathbf{b} \), then its shorter diagonal is of length:

The bulking of the sand is increased in volume from 20% to 40% of various sand and moisture content ranges from ……… to ……….. percent.

Fill in the blank with the correct option:
Most of the guests arrived for the concert __________ bus.

A particle of charge \( 2 C \) is moving with a velocity \( (3\hat{i} + 4\hat{j}) \) m/s in the presence of magnetic and electric fields. If the magnetic field is \( ( \hat{i} + 2\hat{j} + 3\hat{k} ) \) T and the electric field is \( (-2\hat{k}) \) NC\(^{-1}\), then the Lorentz force on the particle is:

Given the characteristic equation below, what is the number of roots which will be located to the right of the imaginary axis? \[ s^4 + 5s^3 - s^2 - 17s + 12 = 0 \]

There was an “Each One Teach One” camp held in your school during summer vacations. As student editor of the school magazine, write a report on the camp. You are Sneh/Surbhi. You may use the following cues along with your ideas to write the report. Invent necessary details. \begin{center} \fbox{ \parbox{0.9\linewidth}{ Cues: Children from neighbourhood slums — 5 to 8 years Student volunteers from class XI Foundational numeracy and literacy skills Distribution of stationery and books Both oral and written approaches General knowledge quizzes Certificates given } } \end{center}

Consider the following two documents:
Document 1: ML and DL are part of AI.
Document 2: DL is a subset of ML.
Implement all four steps of the Bag of Words (Bow) model to create a document vector table .Depict the outcome of each step

According to Fajan's rules, which of the following is not correct about covalent character?

What is the twist at the end of the story "The Necklace'? (The Necklace)