First restriction endonuclease enzyme was discovered in :
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September 2023
Which of the following has an inverted pyramid? 1) Pyramid of biomass in grass land 2) Pyramid of biomass in pond ecosystem 3) Pyramid of number in grass land 4) Pyramid of energy in pond ecosystem
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September 2023
The manufacture of fluorine is done by: 1) Heating anhydrous HF and MnO2 2) Electrolysis of aqueous HF 3) Electrolysis of anhydrous HF mixed with KHF2 4) Heating a mixture of KF, MnO2 and conc.H2SO4
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September 2023
Reactivity of following for Friedel crafts reaction is in the order i) Benzene ii) Chloro Benzene iii) Toluene
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January 2023
Two blocks of mass 1 and 3 Kg are moving with velocities 2 and 1 m/s respectively as shown.If the spring constant is 75 ,the maximum compression of the spring is
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December 2022
The number of isomers possible for disubstituted borazine, B3N3H4X2 is 1) 3 2) 4 3) 6 4) 2
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December 2022
The pKa of a weak acid HA and pKb of weak base BOH are 4.60 and 4.80 respectively. The pH of 0.1 M solution of the salt, BA formed from the acid HA and base BOH is
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December 2022
In the figure, a charged sphere of mass m and charge q starts sliding from rest on a vertical fixed circular track of radius R from the position shown in the figure. There exists an uniform and constant horizontal magnetic field of induction B. The maximum force exerted by the...
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December 2022
If r=k[H]n and rate becomes 100 times when pH changes from 2 to 1. Hence, order is
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December 2022
When CO is heated with NaOH under pressure, we get 1) Sodium benzoate 2) Sodium acetate 3) Sodium formate 4) Sodium carbonate
Reabsorption of vitamin B12 requires
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December 2022
An object is placed at a distance of 40 cm from a concave mirror of focal length 15 cm. If the object is displaced through a distance of 20 cm towards the mirror, the displacement of the image will be
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December 2022
Gelatin often used as an ingredient in the manufacture of ice-cream. The reason for this
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December 2022
An isolated population with equal number of blue-eyed and brown-eyed individuals was decimated by earthquake. Only a few brown-eyed individuals survived to form next generation. The change in gene pool is
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December 2022
A beam of unpolarised light of intensity I0 is passed through a polaroid A and then through another polaroid B which is oriented so that its principal plane makes an angle of 900 relative to that of A. What is the intensity of the emergent light when (N-1) more polaroids...
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December 2022
A source emits electromagnetic waves of wavelength 3m. One beam reaches the observer directly and other after reflection from a water surface, travelling 1.5 m extra distance and with intensity reduced to 1/4 as compared to intensity due to the direct beam alone. The resultant intensity will be:
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December 2022
Shown in the figure here is a convergent lens placed inside a cell filled with a liquid. The lens has focal length +20 cm when in air and its material has a refractive index 1.50. If the liquid has refractive index 1.60, the focal length of the system is
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December 2022
DNA is absent in 1) Mature RBC 2) Peroxisomes 3) Platelets 4) Both 1 and 2
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December 2022
4-carbohydrates glucose, lactose, sucrose, starch are present. Different test is carried out with 4-carbodydrates separately. Following observation takes place. a) Heated : it is charred b) I2 solution : no violet colour c) Fehling solution : reddish brown ppt, is observed. d) It does not reduce copper (II) acetate to...