List of practice Questions

Among the following which one can have a meso form?
The empirical formula of a compound is $CH _{2}$. One mole of this compound has a mass of $42\, g$. Its molecular formula is :
A bar magnet has a coercively $ 4\times {{10}^{3}}A{{m}^{-1}} $ . It is desired to demagnetize it by inserting it inside a solenoid $12\, cm$ long and having $60$ turns. The current carried by the solenoid should be:
$ Ag^+ \, + NH_3 \rightleftharpoons [ Ag ( NH_3 ) ]^+ ; K_1 = 3.5 \times 10^{ - 3 } $ $ [ Ag ( NH_3 )]^+ \, + NH_3 \rightleftharpoons [ Ag (NH_3 )_2 ]^+ ; K_2 = 1.7 \times 10^{ - 3 } $ then the formation constant of $ [ Ag (NH_3)_2]^+ $ is...
Some chemists at ISRO wished to prepare a saturated solution of a silver compound and they wanted it to have the highest concentration of silver ion possible. Which of the following compounds, would they use? $K_{s p}( AgCl )=1.8 \times 10^{-10} $ $K_{s p}( AgBr )=5.0 \times 10^{-13} $ $K_{s p}\left( Ag _{2} CrO _{4}\right)=2.4 \times 10^{-12}$
$40\, ml$ of $0.1\, M$ ammonia solution is mixed with $20 \,ml$ of $0.1\, M\, HCl$. What is the $pH$ of the mixture? $\left( p K_{b}\right.$ of ammonia solution is $\left.4.74\right)$
Which of the following statements is incorrect?
The angular velocity of second hand, of a clock is :
A heavy stone hanging from a massless string of length $15\, m$ is projected horizontally with speed $147\, m/ s$. The speed of the particle at the point where the tension in the string equals the weight of the particle is?
Innate immunity is provided by
A ball is projected upwards from a height h above the surface of the earth with velocity v. The time at which the ball strikes the ground is
Which is connecting link between reptiles and aves
A substance called ADH is
Transition elements are generally used as catalyst because
Turner's syndrome is an example of
One mole of glucose on metabolism liberates how many kilo calories of energy for use in the body
The skip zone in radio wave transmission is that range where
The enzyme responsible for atmospheric nitrogen fixation is:
Which of the following is true for rays coming from infinity?
Which is true for rolling friction $\left(\mu_{r}\right)$, static friction $\left(\mu_{s}\right)$ and kinetic friction $\left(\mu_{k}\right)$ :
If a body moves for 2 s with 15 m/s velocity towards east and then moves with 5 m/s velocity for 8 s towards north, then average velocity is :
The width of the diffraction band varies
A beam of light of wavelength $600\, nm$ from a distant source falls on a single slit $1mm$ wide and the resulting diffraction pattern is observed on a screen $2m$ away. The distance between the first dark fringes on either side of the central bright fringe is
A galvanometer has a resistance of 50$\Omega$. If a resistance of 1$\Omega$ is connected across its terminals, the total current flow through the galvanometer is [$I_g$ represents the maximum current that can be passed through the galvanometer]
A network of four capacitors of capacity equal to $C_{1}=C, C_{2}=2 C, C_{3}=3 C$ and $C_{4}=4 C$ are connected to a battery as shown in the figure. The ratio of the charges on $C_{2}$ and $C_{4}$ is.: