List of practice Questions

The light reflected by a plane mirror may form a real image
The molecular mass of $ KMn{{O}_{4}} $ is M. The equivalent weight of $ KMn{{O}_{4}} $ , when it is converted into $ KMn{{O}_{4}} $ is:
The set of all real numbers x for which $x^2-|x+2|+x>0$ is
Which of the following has the highest dipole moment?
When $KMnO_4 $acts as an oxidising agent and ultimately forms $MnO^{2-}_4, MnO_2, Mn_2O_3 \, and \, Mn^{2+}$. Then the number of electrons transferred in each case respectively
If in a circular coil $A$ of radius $R,$ current $i$ is flowing and in another coil $B$ of radius $2 R$ a current $2 i$ is flowing, then the ratio of the magnetic fields, $B_{A}$ and $B_{B}$ produced by them will be :
The inductance between A and D is :
The magnetic field lines due to a bar magnet are correctly shown in
If $a > 0$ and discriminant of $ax^2 + 2bx +c $ is -ve then $\begin{vmatrix}a&b&ax+b\\ b &c&bx+c\\ ax+b &bx+c&0\end{vmatrix} $ is equal to
The domain of $\sin^{-1}\left[\log_3\left(\frac{x}{3}\right)\right]$ is
Term ecosystem was given by
Teflon is a polymer of
Manipulation of DNA in genetic engineering became possible due to the discovery of :-
A 100 W bulb $B_1$ and two 60 W bulbs $B_2 \, and\, B_3$, are connected to a 250 V source, as shown in the figure. Now $W_1, W_2 \, and \, W_3$ are the output powers of the bulbs $B_1, B_2$ and $B_3$ respectively. Then,
If an ammeter is to be used in place of a voltmeter, then we must connect with the ammeter :
The resistivity of metal increases with increase in temperature because:
The normality of mixture obtained by mixing $100\, mL$ of $0.2\, M H _{2} SO _{4}$ and $200\, mL$ of $0.2 \,M\,HCl$ is :
A small block is connected to one end of a massless spring of unstretched length 4.9 m. The other end of the spring (see the figure) is fixed. The system lies on a horizontal frictionless surface. The block is stretched by 0.2 m and released from rest at t = 0. It then executes simple harmonic motion with angular frequency to = $\frac{\pi }{3}$ rad/s. Simultaneously at t = 0, a small pebble is projected with speed v from point P at an angle of 45$^{\circ}$ as shown in the figure. Point P is at a horizontal distance of 10 m from O. If the pebble hits the block at / = 1 s, the value of v is $ (take \, \, g = 10 m /s_2 $
When a graph is plotted between log K and $ \left( \frac{1}{T} \right), $ the slope of line obtained represents: (K = rate constant, T = temperature)
Consider the chemical reaction, $N_2(g)+3H_2(g)\rightarrow 2NH_3(g)$ .The rate of this reaction can be expressed in terms of time derivatives of concentration of $N_2(g), H_2(g) or NH_3(g)$. Identify the correct relationship amongst the rate expressions
For the reaction : $ {H2 + Cl2 ->[{\text{sunlight}}] 2HCl}$ the order of reaction is
Algae are useful because they
Megasporophyll of Cycas has the same nature as
Circinate vernation is present in
How many moles of electron weighs 1 kg?