KVPY Class-XII ...

Suppose, we have to cover xy-plane with identical tiles such that no two tiles overlap and no gap is left between the tiles. We can choose tiles of shapes like equilateral triangle, square, regular pentagon and regular hexagon. Then, the tiling can be done with tiles of

Physical processes are sometimes described visually by lines. Which one of following can intersect each other?

A nurse measures the blood pressure of a seated patient to be 190 mm of Hg.

Choose the correct option.

An electron with kinetic energy E collides with a hydrogen atom in the ground state. The collision will be elastic

The continuous part of X-ray spectrum is a result of:

Thermal expansion of a solid is due to the

The packing efficiency of the face centred cubic (fcc), body centred cubic (bcc) and simple/primitive cubic (pc) lattices follows the order:

The most stable Lewis acid-base adduct among the following is:

A unit cell of calcium fluoride has four calcium ions. The number of fluoride ions in the unit cell is

Which of the following molecules is a primary acceptor of CO₂ in photosynthesis?

Which of the following pairs of molecules does not form a hydrogen bond?

Which of the following statements is incorrect regarding biological membrane?

The percentage of sunlight captured by plants is

The hard outer layer of pollens, named exine, is made of

Insectivorous plants, such as Venus flytrap catch and digest insects in order to supplement the deficiency of

Which of the following statements about nucleosomes is true?

Epithelial cells in animals are held by specialised junctions, one of them being "gap junctions". Which of the following is the function of "gap junctions"?

Which of the following statements is true about glandular epithelium in salivary glands?

Which of the following ion pairs is involved in nerve impulses?

Which of the following hormones controls blood pressure and is secreted by the human heart?

Oxytocin and vasopressin are synthesised in

The path of passage of stimulus, when you accidentally touch a hotplate, is

In the presence of glucose and lactose, Escherichia coli utilises glucose. However, lactose also enters the cells because

Passive immunisation is achieved by administering

If ¹⁴CO₂ is added to a suspension of photosynthesising chloroplasts, then which of the following will be the first compound to be radioactive?

Which of the following species makes the largest true flower in the world?

Match the following organelIes in Group I with the structures in Group II.

Match the human disorders shown in Group I with the biochemical processes in Group II.

If the initial number of template DNA molecules in a PCR reaction is 1000, then the number of product DNA molecules at the end of 20 cycles will be closest to