Q. The electric field of an electromagnetic wave in vacuum is given by The wave is reflected from the 𝑧 = 0 surface. If the pressure exerted on the surface is 𝛼𝜖0𝐸20, the value of 𝛼 (rounded off to one decimal place) is Ans: 0.8 Sol:
The electric field of an electromagnetic wave in vacuum is given by Read More »
Which part of poppy plant is used to obtain the drug “Smack”? Option 1 : FlowersOption 2 : RootsOption 3 : LatexOption 4 : Leaves
Which part of poppy plant is used to obtain the drug “Smack”? Read More »
In a growing population of a country, Option 1 : Reproductive individuals are less than the post-reproductive individuals.Option 2 : Pre-reproductive individuals are more than the reproductive individuals.Option 3 : Reproductive and pre-reproductive individuals are equal in number.Option 4 : Pre-reproductive individuals are less than the reproductive individuals.
All of the following are included in ‘Ex-situ conservation’ except Option 1 : Wildlife safari parksOption 2 : Botanical gardensOption 3 : Sacred grovesOption 4 : Seed banks
All of the following are included in ‘Ex-situ conservation’ except Read More »
Q. An infinitely long thin cylindrical shell has its axis coinciding with the z-axis. It carries a surface charge density 𝜎0cos𝜙, where 𝜙 is the polar angle and 𝜎0 is a constant. The magnitude of the electric field inside the cylinder is Ans:
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The similarity of bone structure in the forelimbs of many vertebrates is an example of Option 1 : HomologyOption 2 : Convergent evolutionOption 3 : AnalogyOption 4 : Adaptive radiation
The similarity of bone structure in the forelimbs of many vertebrates is an example of Read More »
Q. A massive particle X in free space decays spontaneously into two photons. Which of the following statements is true for X? (A) X is charged (B) Spin of X must be greater than or equal to 2 (C) X is a boson (D) X must be a baryon Ans: X is a boson
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Which one of the following population interactions is widely used in medical science for the production of antibiotics? Option 1 : ParasitismOption 2 : AmensalismOption 3 : CommensalismOption 4 : Mutualism
Conversion of milk to curd improves its nutritional value by increasing the amount of Option 1 : Vitamin B12Option 2 : Vitamin AOption 3 : Vitamin EOption 4 : Vitamin D
Conversion of milk to curd improves its nutritional value by increasing the amount of Read More »
Q. In order to estimate the specific heat of phonons, the appropriate method to apply would be (A) Einstein model for acoustic phonons and Debye model for optical phonons (B) Einstein model for optical phonons and Debye model for acoustic phonons (C) Einstein model for both optical and acoustic phonons (D) Debye model for both
