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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?
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
An organism used as a bio-fertilizer for raising soybean crop is:
Match List-I with List-II relating to microbes and their products: List-I (Microbes) A. Streptococcus B. Trichoderma polysporum C. Monascus purpureus D. Aspergillus niger List-II (Products) I. Citric acid II. Clot buster III. Cyclosporin A IV. Statins
An air bubble in a glass slab with refractive index 1.5 (near normal incidence) is $5\text{ cm}$ deep when viewed from one surface and $3\text{ cm}$ deep when viewed from the opposite face. The thickness (in cm) of the slab is:
Two similar thin equi-convex lenses, of focal length $f$ each, are kept coaxially in contact with each other such that the focal length of the combination is $F_1$. When the space between the two lenses is filled with glycerin which has the same refractive index as that of glass ($\mu = 1.5$), then the equivalent focal length is $F_2$. The ratio $F_1 : F_2$ will be:
The dimensions of $(\mu_0\varepsilon_0)^{-1/2}$ are:
In a p-n junction diode, the change in temperature due to heating: