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Among the following, the most characteristic oxidation states for lead and tin are, respectively:
Which of the following is the correct sequence of events in the origin of life? I: Formation of protobionts. II: Synthesis of organic monomers. III: Synthesis of organic polymers. IV: Formation of DNA-based genetic systems.
From his experiments, S.L. Miller produced amino acids by mixing which of the following in a closed flask?
Two large, thin metal plates are parallel and close to each other. On their inner faces, the plates have surface charge densities of opposite signs and of magnitude $17.0 \times 10^{-22} \, \text{C/m}^2$. The electric field between the plates is:
A p-type extrinsic semiconductor is obtained when Germanium is doped with:
In a Rutherford scattering experiment when a projectile of charge Z₁ and mass M₁ approaches a target nucleus of charge Z₂ and mass M₂ the distance of the closest approach is r₀. What is the energy of the projectile?
HCl was passed through a solution of $CaCl_2$, $MgCl_2$ and $NaCl$. compound(s) crystallise(s)?
Which of the following structure is homologous to the wing of a bird?
The flippers of the Penguins and Dolphins are the example of:
Embryological support for evolution was proposed by:
To get output Y = 1 for the following circuit, the correct choice for the input is:
Which ion is isoelectronic with $Be^{2+}$?
A high value of BOD (Biochemical Oxygen Demand) indicates that:
Read the following statement having two blanks (A and B): "A drug used for ______ (A)___ patients is obtained from a species of the organism ______ (B)___ ". The one correct option for the two blanks is: Blank-A Blank-B
Select the correct group/set of Australian Marsupials exhibiting adaptive radiation.
Match List-I with List-II with respect to convergent evolution: List-I (Placental Mammals) A. Lemur B. Bobcat C. Anteater D. Flying squirrel List-II (Australian Marsupials) I. Flying phalanger II. Numbat III. Spotted cuscus IV. Tasmanian tiger cat
The output ($X$) of the logic circuit shown in the figure will be:
An observer is using an astronomical refracting telescope to observe planets in normal adjustment. The focal lengths of the objective and eyepiece used in the telescope construction are $20 \text{ m}$ and $2 \text{ cm}$ respectively. Consider the following statements about the telescope: (A) The distance between the objective and the eyepiece is $20.02 \text{ m}$. (B) The magnification of the telescope is $-1000$. (C) The image of the planet is erect and diminished. (D) The aperture of the eyepiece is smaller than that of the objective. The correct statements are:
Match the following microorganism with the product they produce: Column I (a) Trichoderma polysporum (b) Monascus purpureus (c) Streptococcus (d) Saccharomyces cerevisiae Column II (i) Statins (ii) Cyclosporin A (iii) Ethanol (iv) Streptokinase
The additional kinetic energy to be provided to a satellite of mass m revolving around a planet of mass M, to transfer it from a circular orbit of radius R₁ to another of radius R₂ (R₂ > R₁) is