List of practice Questions

A body of mass 3 kg is under a constant force which causes a displacement s in meters in it, given by the relation s = (\(\frac{1}{3}\)) t2, where t is in s. Work done by the force in 2 s is :
Given, the mass of electron is $9.11 \times 10^{-31}\, kg$, Planck's constant is $6.626 \times 10^{-34}\, Js$, the uncertainty involved in the measurement of velocity within a distance of $0.1 \mathring{A}$ is
If $?=10^{-10}m$ changes to $?'=0.5 \times 10^{-10}m, $ find energy difference $(?E) $ given to the particle
A block of wood resting on an inclined plane of angle $ 30{}^\circ $ , just starts moving down. If the coefficients of friction is 0. 2, its velocity (in ms-1) after 5 s is: $ (g=10m{{s}^{-2}}) $
A body of mass 2 kg is projected from the ground with a velocity $ 20m{{s}^{-1}} $ at an angle $ 30{}^\circ $ with the vertical. If $ {{t}_{1}} $ is the time in seconds at which the body is projected and $ {{t}_{2}} $ is the time in seconds at which it reaches the ground, the change in momentum in kg ms-1 during the time $ ({{t}_{2}}{{t}_{1}}) $ is:
The formula for exponential population growth is -

Acrolein test is positive for:

At $pH = 4$ glycine exists as
Which of the following is not an ore of magnesium?
$\Delta G ^ \circ \,Vs\, T$ plot in the Ellingham's diagram slopes downwards for the reaction
Which of the following reaction taking place in the Blast furnace is endothermic ?
In the conversion of $Br_2$ to $BrO^-_3 $, the oxidation number of $Br$ changes from
Which of the following is not an ore of magnesium?
Which of the following can participate in linkage isomerism ?
The formation of $ O^{+}_2 [P_t F_6 ]^-$ is the basis for the formation of Xenon fluorides. This is because
When a quantity of electricity is passed through $CuSO_4$ solution, $0.16\, g$ of Copper gets deposited. If the same quantity of electricity is passed through acidulated water, then the volume of $H_2$ liberated at $STP$ will be [Given $At. Wt. Cu = 64$]
Which of the following does not conduct electricity ?
Which of the following represents the Lewis structure of $N_2$ molecule ?
If $r_1$, and $r_2$ are the radii of the atomic nuclei of mass numbers $64$ and $125$ respectively, then the ratio ($r_1/r_2$) is
The value of $\begin{vmatrix} x+y&y+z & z+ x \\[0.3em] x & y & z \\[0.3em] x-y & y-z & z-x \end{vmatrix}$ = is equal to :
Which one of the following has an open circulatory system?
$Cr$ is member of $3d$ transition series of atomic number $24$. What will be its electronic configuration?
The chief function of sieve tube element is:
Jurassic period of mesozoic era is characterised by-
Which one of the following is not a living fossil-