List of practice Questions

A thin disc of radius $b\, = \,2a$ has a concentric hole of radius '$a$' in it (see figure). It carries uniform surface charge '$\sigma$' on it. If the electric field on its axis at height '$h$' $(h < < a)$ from its centre is given as '$Ch$' then value of '$C$' is :

Higher order $( > 3 )$ reactions are rare due to

Which of the following compounds is not colored yellow?

Which of the following statements is not correct?

Cell wall is absent in

Which one of the following is oviparous?

Filiform apparatus is characteristic feature of

Blood pressure in the mammalian aorta is maximum during

Glenoid cavity articulates

Write the set builder form $A = {-1, 1}$

If $\alpha$ and $\beta$ are the roots of $x^2 - ax + b^2 = 0$, then $\alpha^2 + \beta^2$ is equal to

A box contains $6$ red marbles numbers from $1$ through $6$ and $4$ white marbles $12$ through $15$. Find the probability that a marble drawn 'at random' is white and odd numbered.

The Nobel Prize in Chemistry in $2005$ was awarded for the work

A bag contains $(2 n+1)$ coins. It is known that $n$ of these coins have a head on both sides, whereas the remaining $(n+1)$ coins are fair. $A$ coin is picked up at random from the bag and tossed. If the probability that the toss results in a head is $31 / 42$, then $n$ is equal to

Across a metallic conductor of non-uniform cross section a constant potential difference is applied. The quantity which remains constant along the conductor is:

For a weak electrolyte, a plot of a (degree of ionisation)vs $1/C$ gives

The numbers of $ {H^+}$ ions present in 1 mL of a solution whose pH is 13

The quadratic expression $\left(2x+1\right)^{2}-px+q\ne0$ for any real $x$ if

The area (in s units) of the quadrilateral formed by the tangents at the end points of the latera recta to the ellipse $\frac{x^{2}}{9}+\frac{y^{2}}{5}=1$, is:

The correct order of thermal stability of hydroxides is :

Photochemical smog consists of excessive amount of $X$, in addition to aldehydes, ketones, peroxyacetyl nitrile $(PAN)$, and so forth. $X$ is :

If $\quad \tan \theta \cdot \tan \left(120^{\circ}-\theta\right) \tan \left(120^{\circ}+\theta\right)=\frac{1}{\sqrt{3}}$, then $\theta$ is equal to

The body cells in cockroach discharge their nitrogenous waste in the haemolymph mainly in the form of

Among china rose, mustard, brinjal, potato, guava, cucumber, onion and tulip, how many plants have superior ovary?

In the spectrum of hydrogen, the ratio of the longest wavelength in the Lyman series to the longest wavelength in the Balmer series is