List of practice Questions

Following table summarises the comparisons between phyllodades and cladodes (cladophylls). Pick up the wrong differences and select the correct option,
What type of pollination takes place in Vallisneria?
Which of the following ecological pyramids is generally inverted ?
In pteridophytes, main plant body is a , which is into true roots, stem and leaves. Fill the blanks in above statement and select the correct option.
The complex that has highest crystal feild splitting energy $(\Delta )$, is :
The number of sigma ($\sigma$)and pi ($\pi$) bonds in pent-2-en-4-yne is :
The pair that does NOT require calcination is:
Hall-Heroult's process is given by :
NaH is an example of :
The compound that inhibits the growth of tumors is :
The correct structure of tribromooctaoxide is
Two similar thin $equi-convex$ lenses, of focal length $f$ each, are kept coaxially in contact with each other such that the focal length of the combination is $F_1$. When the space between the two lenses is filled with glycerin (which has the same refractive index $(p = 1.5)$ as that of glass) then the equivalent focal length is $F_2$. The ratio $F_1$ : $F_2$ will be :
Two very long, straight, and insulated wires are kept at $90^{\circ}$ angle from each other in $xy$ - plane as shown in the figure. These wires carry currents of equal magnitude $I$, whose directions are shown in the figure. The net magnetic field at point $P$ will be :
A thermometer graduated according to a linear scale reads a value $x_0$ when in contact with boiling water, and $x_0/3$ when in contact with ice. What is the temperature of an object in $0 {^{\circ}C}$, if this thermometer in the contact with the object reads $x_0/2$ ?
A soap bubble, blown by a mechanical pump at the mough of a tube, increases in volume, with time, at a constant rate. The graph that correctly depicts the time dependence of pressure inside the bubble is given by :
How does steroid hormone influence the cellular activities?
Which of the following alkyl halides is used as a methylating agent ?
Surface tension of lyophillic sols is
When \(1M\ H_2SO_4\) is completely neutralised by sodium hydroxide, the heat liberated is 114.64 kJ. What is the enthalpy of neutralisation ?
Which of the following halides undergoes \(S_N1\) reaction at the fastest rate?
What is DDT among the following?
During adsorption
Which of the following will give red precipitate when reacted with complexes formed by copper sulphate and sodium tartarate ?
Which of the following is anti aromatic compound ?
Which of the following alkaline earth metal hydroxides is amphoteric in character?