List of practice Questions

For a reaction $A \rightarrow $ Products, a plot of log $t_{1/2}$ versus log $a_0$ is shown in the figure. If the initial concentration of A is represented by $a_0$, the order of the reaction is

For a reaction, $r = k(CH_3COCH_3)^{3/2}$ then unit of rate of reaction and rate constant respectively is

The rate equation of a gaseous reaction is given by, $r = k[A][B]$. If the volume of reaction vessel is suddenly reduced to half of the initial volume, the reaction rate relating to the original rate will be

In which of the following plants, reproductive structures lack a layer of sterile vegetative cells surrounding the gametes?

Mannitol is stored in

Acrocarpous solitary sporangia are found in

In Cycas, dehiscence of microsporangium occurs when pollen grains are at

Bryophytes are known as amphibians of plant kingdom because

Fucoxanthin is characteristic pigment of

Mitospores of algae are differentiated by

Syngamy is the fusion of

Carpogonium is formed in

Which of the following is not present is thallus of Marchantia ?

Sex organs in pteridophytes are

Which is not true of Pinus

Which plays an important role in the dispersal of spores in Funaria?

The leaves of fern plants are called

The tallest tree speices of gymnosperms is

The weight of oxalic acid that will be required to prepare a $1000\, mL$ $\left(\frac{N}{20}\right)$ solution is

Equal weights of $CH_{4}$ and $H_{2}$ are mixed in an empty container at $25^\circ C$. The fraction of the total pressure exerted by $H_{2}$ is

An aqueous solution of oxalic acid dihydrate contains its 6.3 g in 250 ml. The volume of 0.1 N NaOH required to completely neutralize 10 ml of this solution

Number of atoms of $He$ in $100$ amu of $He$ (atomic wt. of $He$ is $4$) are :

A cubical region of side a has its centre at the origin. It encloses three fixed point charges, $- q$ at $(0,- \frac{a}{4} ,0), + 3q$ at $(0, 0, 0)$ and $- q$ at $(0,+ \frac{a}{4},0)$. Choose the correct option(s).

An electrostatic field line never form closed loop. Electrostatic field is a conservative field.

If one root is square of the other root of the equation $x^2 + px + q = 0$, then the relations between p and q is