List of practice Questions

Standard entropies of $X_2 ,Y_2$ and $XY_3$ are $60 , 40 $ and $ 50 \, JK^{-1} mol^{-1}$ respectively. For the reaction $ { \frac{1}{2} X_2 + \frac{3}{2}Y_2 <=> XY_3, \Delta H = -30 kJ}$ to be at equilibrium, the temperature should be

Three moles of an ideal gas expanded spontaneously into vaccum. The work done will be

The reaction of toluene with $Cl_2$ in the presence of $FeCl_3$ gives 'X' and reaction in presence of light gives 'Y' Thus, 'X' and 'Y' are

A square current carrying loop is suspended in a uniform magnetic field acting in the plane of the loop. If the force on one arm of the loop is $\overrightarrow{F}$ .the net force on the remaining three arms of the loop is

Given are cyclohexanol (I), acetic acid (II), 2, 4, 6-trinitrophenol (III) and phenol (IV). In these, the order of decreasing acidic character will be

Which one of the following is not used in organic farming ?

The first order integrated rate equation is

A light ray going from air is incident (as shown in figure) at one end of a glass fibre (refractive index $ \mu = 1.5$) making an incidence angle of $60^\circ$ on the lateral surface,

so that it undergoes a total internal reflection. How much time would it take to traverse the straight fibre of length 1 km?

A particle of mass $2 \times 10^{-3}$ kg, charge $4 \times 10^{-3}$ C enters in an electric field of 5 V/m, then its kinetic energy after 10 s is

In unilocular ovary with a single ovule the placentation is

Transport of food material in higher plants takes place through

Keel is characteristic of the flowers of

Study the cycle shown below and select the . option which gives correct words for all the four blank A, B, C and D.

Algae have cell wall made up of

Carrot is a

Consider the following four statements (i), (ii), (iii) and (iv) and select the right option for two correct statements. Statements : (i) In vexillary aestivation, the large posterior petal is called-standard, two lateral ones are wings and two small anterior petals are termed keel (ii) The floral formula for liliaceae is $\bigoplus ⚥ P_{3 + 3} \, A_{3+3} + \underline{G}_3$ (iii) In pea flower the stamens are monadelphous (iv) The floral formula for solanaceae is $\bigoplus ⚥ K_{(3)} C_{(3)} A_{(4)} + \underline{G}_2$ The correct statements are

Cleavage polyembryony occurs in

In Pinus, male cone bears a large number of

Podocytes are the cells, present in

Apomictic embryos in Citrus arise from

The correct floral formula of soyabean is

The vector equation of the straight line $ 6x-8=2y-7=3z $ is

if the straight lines $ 2x+5ay-1=0 $ and $ 3x+7y+7=0 $ are mutually perpendicular, then value of $a$ is

The unit normal vector to the plane $ 3x+2y-2z=8\sqrt{17} $ is

If $A$ is a square matrix of order $3$ and if $ \det \,(A)=3, $ then $ \det \,[adj\,\,\{adj\,(adj\,A)\}] $ is equal to