KVPY Class-XI (...

The number of distinct prime divisors of the number 512³ - 253³ - 259³ is

The following three objects (1) a metal tray, (2) a block of wood, and (3) a woollen cap are left in a closed room overnight. Next day the temperature of each is recorded as T₁, T₂ and T₃ respectively. The likely situation is

We sit in the room with windows open. Then,

A convex lens is used to form an image of an object on a screen. If the upper half of the lens is blackened so that it becomes opaque, then

Two balloons, A and B, containing 0.2 moles and 0.1 moles, respectively, of helium at room temperature and 2.0 atm are connected. When equilibrium is established, the final pressure of He in the system is

The set of principal (n), azimuthal (l) and magnetic (m_l) quantum numbers not allowed for the electron in H-atom is

When chlorine gas is passed through an aqueous solution of KBr, the solution turns brown due to the formation of

If parents have free earlobes and the offspring has attached earlobes, then the parents must be

During meiosis, there is

Blood clotting involves the conversion of

The gallbladder is involved in

Which of the following colours is LEAST useful for plant life?

At rest, the volume of air that moves in and out per breath is called

Scurvy is a result of the deficiency of

How many sex chromosomes does a normal human inherit from the father?

Which of the the following structures is NOT found in plant cells?

The cell that transfers information about pain to the brain is called a

The presence of nutrients in the food can be tested. Benedict's Test is used to detect

Several minerals such as iron, iodine, calcium and phosphorus are important nutrients. Iodine is found in

The principle upon which a lactometer works is

Mammalian liver cells will swell when kept in

The form of cancer called 'carcinoma' is associated with

Three taps A, B, C fill up a tank independently in 10 hr, 20 hr, 30 hr, respectively. Initially the tank is empty and exactly one pair of taps is open during each hour and every pair of taps is open at least for one hour. What is the minimum number of hours required to fill the tank?

You remove four fresh tobacco leaves of similar size and age. Leave leaf 1 as it is, smear leaf 2 with Vaseline on the upper surface, leaf 3 on the lower surface and leaf 4 on both the surfaces. Hang the leaves for a few hours and you observe that leaf 1 wilts the most, leaf 2 has wilted, leaf 3 has wilted less than leaf 2 and leaf 4 remains fresh. Which of the following conclusions is most logical?

Vestigial organs such as the appendix exist because

Mendel showed that unit factors, now called alleles, exhibit a dominant/recessive relationship. In a monohybrid cross, the __________ trait disappears in the first filial generation.

If a man with an X-linked dominant disease has six sons from a woman having a normal complement of genes, then

In evolutionary terms, an Indian school boy is more closely related to