List of practice Questions

The activity of ratio altitude $ ({{X}^{100}}) $ is 6.023 curie. If its disintegration constant is $ 3.7\times {{10}^{4}}{{\sec }^{-1}}, $ the mass of X is :

The standard reduction potentials at 298 K for the following half cell reactions are given below: $ Z{{n}^{2+}}(aq)+2{{e}^{-}}\rightleftharpoons Zn(s)-0.762 $ $ C{{r}^{3+}}(aq)+3{{e}^{-}}\rightleftharpoons Cr(s)-0.74 $ $ 2{{H}^{+}}(aq)+2{{e}^{-}}\rightleftharpoons {{H}_{2}}(g)\,0.00 $ $ F{{e}^{3+}}(aq)+{{e}^{-}}\rightleftharpoons F{{e}^{2+}}(aq)+0.77 $ Which one of the following is the strongest reducing agent?

The state of hybridization of B in $ \text{BC}{{\text{l}}_{\text{3}}} $ is :

The radii of $ \text{F,}{{\text{F}}^{-}}\text{O} $ and $ {{\text{O}}^{2-}} $ are in the order

Light of certain wavelength and intensity ejects photoelectrons from a metal plate. Then this beam is replaced by another beam of smaller wavelength and smaller intensity. As a result

A galvanometer has a resistance G and a current flowing in it produces full scale deflection. \(S_1\) is the value of the shunt, which converts it into an ammeter of range \(0-I\) and \(S_2\) is the value of the shunt for the range \(0-2I\). The ratio is

$P, Q$ and $R$ are three coplanar forces acting at a point and are in equilibium. Given $P=1.9318\, kg\, wt$ $\left[\sin \theta_{1}=0.9659\right]$, the value of $R$ (in $kg$ wt) is

Choke used to limit high frequency A.C. has

One mole of an ideal gas undergoes a cyclic change ABCD. From the given diagram calculate the net work done in the process. (1 atm = $10^6\,dyne\,cm^{-2}$) is

Let $ [ \varepsilon_0 ] $ denote the dimensional formula of the permittivity of the vacuum and $ [ \mu_0 ] $ that of the permeability of the vacuum. If $M$ = mass, $L$ = length, $T$ = time and $I$ = electric current.

Which of the following is not the main function of lymph glands?

The functional unit of contractile system in a striated muscle is

Total number of bones in each limb of a man is

In the developmental history of mammalian heart, it is observed that it passes through a two chambered fish like heart, three chambered frog like heart and finally four chambered stage To which hypothesis can this above cited statement be approximated ?

A female horse (2n = 66) can be crossed with a jackass (2n = 66), resulting in tire birth of a hybrid known as a mule, usually sterile because of chromosomal incompatibility. How many chromosomes would one expect to find in the body cells f a mule?

A particle, with restoring force proportional to displacement and resisting force proportional to velocity is subjected to a force F sin $\omega t$. If the amplitude of the particle is maximum for $\omega = \omega_1$ and the energy of the particle maximum for $ \omega = \omega_2$, then

A beaker of radius 6 cm is filled with mercury up to a height to 12 cm. Given that the density of mercury is $ 13600\text{ }kg/{{m}^{3}}, $ the force exerted by the mercury on the bottom of the beaker is approximately.

Hydrogen bonding is not present

The exchange of gases in the alveoli of the lungs takes place by

Lines of force, due to earth?? horizontal magnetic field, are

Let $f(x) = x - [x] $, for every real number x, where [x] is the integral part of x Then, $ \int^1_{-1} \, f ( x ) \, dx$ is

The richest source of vitamin A are:

The value of $\displaystyle \sum_{k=1}^6 \bigg(\sin\frac{2\pi k}{7}-i \cos \frac{2\pi k}{7}\bigg)$ is

�Mirage� is a phenomenone due to