List of practice Questions

The value of equilibrium constant of the reaction, $ HI(g) \rightleftharpoons \frac{1}{2} H_2 (g) + \frac{1}{2} I_2 (g)\, \, is\, \, 8.0 $ . The equilibrium constant of the reaction, $ H_2 (g) + I_2 (g) \rightleftharpoons 2HI(g) $ Will be

Consider the following four statements (1-4) about certain desert animals such as kangaroo rat (1) they have dark colour and high rate of reproduction and excrete solid urine (2) they do not drink water, breathe at a slow rate to conserve water and have their body covered with thick hairs (3) they feed on dry seeds and do not require drinking water (4) they excrete very concentrated urine and do not use water to regulate body temperature. Which two of the above statements for such animals are true?

For the reaction $Fe_2O_3 +3CO \rightarrow 2Fe + 3CO_2$ the volume of carbon monoxide required to reduce one mole of ferric oxide is

The masses of two radioactive substances are same and their half lives are $1$ year and $2$ years respectively. The ratio of their activities after 6 years will be

The increasing order of the rate of HCN addition to compounds A-D is : (A) HCHO $(B)CH_{3} COCH_{3}$ $\left(C\right)phCOCH_{3}$ $\left(D\right)phcoph$

The perimeter of a certain sector of a circle is equal to the length of the arc of the semicircle. Then the angle at the centre of the sector in radians is

A small conducting sphere of radius $r$ is lying concentrically inside a bigger hollow conducting sphere of radius $R$. The bigger and smaller spheres are charged with $Q$ and $q (Q > q)$ and are insulated from each other. The potential difference between the spheres will be

Rapid increase in the blood sugar level of a patient can be immediately reduced by

A ray of light enters from a rarer to a denser medium. The angle of incidence is $i$. Then the reflected and refracted rays are mutually perpendicular to each other. The critical angle for the pair of media is

The tangents drawn at the extremeties of a focal chord of the parabola $y^2 = 16 x$

The point $(5, - 7)$ lies outside the circle

The equation to the normal to the hyperbola $\frac {x^2}{16}- \frac {y^2}{9}=1$ at $(-4,0)$ is

A gas deviates from ideal behaviour at a high pressure because its molecules

The monomers of buna-$S$ rubber are

Mesomeric effect involves delocalisation of

The calculated bond order of superoxide ion $(O_2^- )$ is

Which of the following electrolytic solutions has the least specific conductance ?

$_{92}U^{235}$ undergoes successive disintegrations with the end product of $_{82}Pb^{203}$.The number of $\alpha$ and $\beta$ particles emitted are

Ethyl alcohol is commercially manufactured from

A body of mass $4\, kg$ is accelerated upon by a constant force, travels a distance of $5\,m$ in the first second and a distance of $2\,m$ in the third second. The force acting on the body is

A mass of $10\,kg$ is suspended from a spring balance. It is pulled aside by a horizontal string so that it makes an angle of $60^\circ$ with the vertical. The new reading of the balance is

Two identical metal spheres charged with $+12 \mu F$ and $-8 \mu F$ are kept at certain distance in air. They are brought into contact and then kept at the same distance. The ratio of the magnitudes of electrostatic forces between them before and after contact is

Figure shows a mixture of blue, green and red coloured rays incident normally on a right angled prism. The critical angles of the material of the prism for red, green and blue are $46^\circ$, $44^\circ$ and $43^\circ$ respectively. The arrangement will separate

Which of the following is considered as an anticancer species?

A body of mass $3 \,kg$ is under a constant force which causes a displacement s in metre in it, given by the relation $s=\frac{1}{3}t^2$, where $t$ is in second. Work done by the force in $2 s$ is