List of practice Questions

Diameter of aperture of a plano-convex lens is $6\, cm$ and thickness at the centre is $3\, mm$. If the speed of light in the material of the lens is $2 \times 10^8 \,m \,s ^{-1}$, the focal length of the lens is
Cruciform corolla is characteristic of Family
Crossing over occurs in the______stage of meiosis
Copper sulphate is dissolved in water containing ________ for making Bordeaux mixture.
Corpus luteum is maintained in a woman, under the effect of
Connecting link between glycolysis and Krebs' cycle is
Carbon dioxide is necessary for photosynthesis. The chemical used to remove this gas most effectively from entering a control apparatus is
Carbonic anhydrase is present in
Biolistic (gene gun) is suitable for
Bicollateral vascular bundles are the characteristic of Family
Barr body is missing in the female suffering from
Use of ball bearings between two moving parts of a machine is a common practice. Ball bearings reduce vibrations and provide good stability
The speedometer of an automobile measures the average speed of the automobile. Average velocity is equal to total distance divided by total time taken.
The nymph of a cockroach undergoes moulting several times. There is gradual metamorphosis in cockroach.
Teflon is chemically inert substance. Chloroform when treated with antimony trifluoride gives teflon.
Parturition is induced by neural signal in maternal pituitary. At the end of gestation period, the maternal pituitary releases prolactin which causes uterine contractions.
In a common emitter transistor amplifier, the input current is much less than the output current than output impedance. The common emitter transistor amplifier has higher input impedance than output impedance
$ BeSO_4$ is soluble in water while $BaSO_4$ is not. Hydration energy decreases down the group from Be to Ba and lattice energy remains almost constant.
A secondary rainbow have inverted colours than the primary rainbow. The secondary rainbow is formed by single total internal reflection.
Apomixis is
Choose the correct statement :
Amongst the following, the most stable complex is
Addition of group-13 elements to intrinsic semiconductors results in
When a substance ' $A$ ' reacts with water, it produces a combustible gas ' $B$ ' and a solution of substance ' $C$ ' in water. while another substance ' $D$ ' reacts with solution of ' $C$ ' to produce the same gas $B$ on warming while ' $D$ ' can produce gas ' $B$ ' on reaction with dilute $H _{2} SO _{4}$ at room temperature. ' $A$ ' imparts a deep golden yellow colour to a smokeless flame on Bunsen burner. Identify 'A', $' B$ ', ' $C$ ' and ' $D$ ' respectively are
$KO _{2}$ (potassium superoxide) is used in oxygen cylinders in space and submarines because of it