List of practice Questions

How many of the transformations given below would result in aromatic amines?

A faulty thermometer reads $5^{\circ} C$ in melting ice and $95^{\circ} C$ in stream.The correct temperature on absolute scale will be_______ $K$ (when the faulty thermometer reads $41^{\circ} C$).

A triangle is formed by $X$-axis, $Y$-axis and the line $3 x+4 y=60$ Then the number of points $P ( n , b )$ which lie strictly inside the triangle, where a is an integer and $b$ is a multiple of a, is ____

It is observed that characteristic $X$-ray spectra of elements show regularity When frequency to the power " $n$ " ie $v^n$ of $X$-rays emitted is plotted against atomic number " $Z$ ", following graph is obtained

Given below are two statements:
Statement I : Pure Aniline and other arylamines are usually colourless.
Statement II : Arylamines get coloured on storage due to atmospheric reduction.
Choose the correct answer

If the two metals $A$ and $B$ are exposed to radiation of wavelength $350 mm$. The work functions of metals $A$ and $B$ are $4.8 eV$ and $2.2 eV$. Then choose the correct option

Given below are two statements: one is labeled as Assertion (A) and the other is labeled as Reason (R).
Statement-1: According to Bohr’s Model, angular momentum is Quantized for stationary orbits.
Statement-2: Bohr’s Model doesn’t follow Heisenberg’s Uncertainty Principle.
In the light of the above statements, write the detailed answer:

The increasing order of metallic character

Let a and b are roots of $x^2 – 7x – 1 = 0$. The value of $\frac{(a_{21} + b_{21} + a_{17} + b_{17})}{(a_{19} + b_{19})}$ is?

Let a and b are roots of x² – 7x – 1 = 0. The value of $\frac{a^{21} + b^{21} + a^{17} + b^{17}}{a^{19} + b^{19}}$ is?

Let $𝑋={11,12,13,…,40,41}$ and $𝑌={61,62,63,…,90,91}$ be the two sets of observations. If $\bar 𝑥$ and $\bar 𝑦$ are their respective means and $σ^2$ is the variance of all the observations in $𝑋∪𝑌$, then $|\bar 𝑥+\bar 𝑦−σ^2|$ is equal to ____ .

The energy levels of an hydrogen atom are shown below. The transition corresponding to emission of shortest wavelength is

The number of species from the following carrying a single lone pair on central atom Xenon is ______ .
XeF₅⁺, XeO₃, XeO₂F₂, XeF₅^-, XeO₃F₂, XeOF₄, XeF₄

The correct relationships between unit cell edge length ‘a’ and radius of sphere ‘r’ for face-centred and body-centred cubic structures respectively are:

A car accelerates from rest to $ u \, \text{m/s} $. The energy spent in this process is $ E \, \text{J} $. The energy required to accelerate the car from $ u \, \text{m/s} $ to $ 2u \, \text{m/s} $ is $ nE \, \text{J} $. The value of $ n $ is.

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: Photodiodes are preferably operated in reverse bias condition for light intensity measurement
Reason R: The current in the forward bias is more than the current in the reverse bias for a $p-n$ junction diode
In the light of the above statements, choose the correct answer from the options given below:

In a medium the speed of light wave decreases to $0.2$ times to its speed in free space The ratio of relative permittivity to the refractive index of the medium is $x: 1$ The value of $x$ is(Given speed of light in free space $=3 \times 10^8 m s ^{-1}$ and for the given medium $\mu =1$)

If $\int \sqrt{\sec 2 x-1} d x=\alpha \log _e\left|\cos 2 x+\beta+\sqrt{\cos 2 x\left(1+\cos \frac{1}{\beta} x\right)}\right|+$ constant, then $\beta-\alpha$ is equal to_______

In the given circuit, the equivalent resistance between the terminal $A$ and $B$ is __$\Omega$