List of practice Questions

Best material for the study of mitosis in laboratory : -

Bark refers to

Axis vertebra is identified by

Transformers are used only in alternating current source not in direct current. Only a.c. can be stepped up or down by means of transformers.

The $S-S-S$ bond angle in $S_8$ molecule is $105^{\circ}$. $S_8$ has a V-shape.

The honey bee queen copulates only once in life. It can lay both fertilised and unfertilised eggs.

The dimensional formula for product of resistance and conductance is same as for dielectric constant. Both have dimensions of time constant.

Protandry and protogyny ensures cross fertilization. Cross fertilization introduces variation in progeny.

Nucleus is the controlling centre of a cell. Pores in the nuclear envelop regulate the flow of materials in and out of the nucleus.

Millon?? test is a test for identification of proteins. Millon?? reagent is a solution of mercurous nitrate and mercuric nitrate in nitric acid containing little nitrous acid.

Impulsive force is large and acts for a short time. Finite change in momentum should be produced by the force.

Glycolysis is the first step of respiration in which glucose completely breaks into CO and HO. In this process, there is net gain of twenty four molecules of ATP.

Bleaching powder is a mixed salt. In the presence of $COCl _{2}$, bleaching powder decomposes to give $CaCl _{2}$ and $O _{2}$.

Among the alkali metals, lithium salts exhibit the least electrical conductance in aqueous solutions. Smaller the radius of the hydrated cation, lower is the electrical conductance in aqueous solutions.

A total reflecting prism is used to erect the inverted image without deviation. Rays of light incident parallel to base of prism emerge out as parallel rays.

A proton and an alpha particle having the same kinetic energy are moving in circular paths in a uniform magnetic field. The radii of their circular pahts will be equal. Any two charged particles having equal kinetic energies and entering a region of uniform magnetic field $\vec{ B }$ in a direction perpendicular to $\vec{ B }$, will describe circular trajectories of equal radii.

Cell $A$ has osmotic potential of - $18$ bars and pressure potential of $8$ bars, whereas, cell $B$ has osmotic potential of - $14$ bars and pressure potential $2$ bars. The direction of flow of water will be

In which of the following patterns of viral replication, viruses enter a cell, replicate and then cause the cell to burst, releasing new viruses?

Pythons possess tiny leg bones that serve no purpose in locomotion. Such organs are

The two critical steps in the evolution of humans were the

Which of the following hormones is secreted by implanted blastocyst that acts on the corpus luteum in the ovary, stimulating the body to produce estrogens and progesterone to maintain the uterine lining?

Animals possess nerve networks or nervous systems to respond to their environment. But the single called Amoeba does not possesses any nerve cell, so, how it come to know whether a particle it encounters is a grain of sand and not its dinner ?

Enzyme often have additional parts in their structures that are made up of molecules other than proteins. When this additional chemical part is an organic molecule, it is called

Genetically engineered bovine $(bST)$, sometimes called $rbST$ (recombinant bovine somatotropin) or $rbGH$ (recombinant bovine growth hormone) are used in the

This method of finding a gene is used when researchers know very little about the gene they are trying to find. This process results in a complete gene library: a collection of copies of DNA fragments that represent the entire genome of an organism.