List of practice Questions

The number of tetrahedral voids is double the number of octahedral voids. The size of the tetrahedral voids is half of that of the octahedral void.
Restriction enzymes cut the strand of DNA to produce sticky ends. Stickiness of the ends facilitates the action of the enzyme DNA polymerase.
Pseudo force is an imaginary force which is recognised only by a non-inertial observer to explain the physical situation according to Newton?? laws. Pseudo force has no physical origin, i.e., it is not caused by one of the basic interactions in nature. It does not exist in the action-reaction pair.
Photorespiration is a wasteful process where there is no synthesis of ATP energy. RuBisCO is present in mesophyll cells of C plants hence they show more productivity.
Hydrides of group-16 elements show volatility in the order : $H_2O > H_2S > H_2Se > H_2Te$ Electronegativity of group-16 elements increases down the group from oxygen to tellurium.
Flavr-Savr tomato was the first transgenic commercial crop that entered the market. Roundup variety of soybean was prepared through breeding.
$[Fe(CN)_6]^{3-}$ has $d^2sp^3$ type hybridisation. $[Fe(CN)_6]^{3-}$ ion shows magnetic moment corresponding to two unpaired electrons.
Cephalisation is advantageous to an animal. Cephalisation improves the appearance of an animal.
Aromatic aldehydes and formaldehyde undergo Cannizzaro reaction. Aromatic aldehydes are almost as reactive as formaldehyde.
An n-type semiconductor has a large number of electrons but still it is electrically neutral. An n-type semiconductor is obtained by doping an intrinsic semiconductor with a pentavalent impurity.
A solid sphere is rolling on a rough horizontal surface. Acceleration of contact point is zero. A solid sphere can roll on the smooth surface.
An artificial pacemaker is implanted subcutaneously and connected to the heart in patients
Which of the following compounds is aromatic in nature?
$H_2O$ is polar, whereas $BeF_2$ is not because
On the basis of standard electrode potential of redox couples given below, find out which of the following is the strongest oxidising agent. (E$^{\circ}$ values : $Fe^{3+}\left| Fe^{2+}=+ 0.77 V ; I_{2\left(s\right)}\right|I^{- } =$ $+ 0.54 V; Cu^{2+}\left|Cu= + .34 V ; Ag^{+}\right| Ag = + 0.80 V$)
A transformer with efficiency 80% works at $4\, kW$ and $100\, V$. If the secondary voltage is $200\,V$, then the primary and secondary currents are respectively
Two concentric conducting thin spherical shells $A$ and $B$ having radii $r _{ A }$ and $r _{ B }\left( r _{ B }> r _{ A }\right)$ are charged to $Q _{ A }$ and $- Q _{ B }\left(\left| Q _{ B }\right|>\left| Q _{ A }\right|\right)$. The electrical field along a line passing through the centre is
Among $Me_3N, C_5H_5N$ and $MeCN$ ($Me$ = methyl group) the electronegativity of $N$ is in the order
Which of the following statements is correct regarding menstrual cycle?
A neutron in a nuclear reactor collides head on elastically with the nucleus of a carbon atom initially at rest. The fraction of kinetic energy transferred from the neutron to the carbon atom is
Documented microfossils have been found that are as old as
The water logging capacity of garden soil will be determined by measuring the weight of
The process where a population inhibits the growth of other population without affecting itself is known as
Some salient features and phyla of organisms are given below. Select the option which shows correct combination of organism, its phylum and salient features.
The figure shows different human tissues labelled as A to D. Which option gives the correct identification of the label, its location and one feature?