A far sighted person can see object beyound 94 cm clearly, if separation between glasses and eye lens is 2 cm, then find
A far sighted person can see object beyound 94 cm clearly, if separation between glasses and eye lens is 2... View Article
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A block is limiting equilibrium on a rough horizontal surface. If the net contact force is sqrt(3) times the normal force, the frictional force is
A block is limiting equilibrium on a rough horizontal surface. If the net contact force is \(\begin{array}{l}\sqrt{3}\end{array} \) times the... View Article
The total average energy density of e.m waves whose electric field variation is given by e = (50 n/c) sin (ωt – kx) will be nearly
The total average energy density of e.m waves whose electric field variation is given by e = (50 n/c) sin... View Article
A ray of light suffers minimum deviation, while passing through a prism. The angle of inclination of the ray, inside the prism with the base of prism is
A light ray suffers minimum deviation, while passing through a prism of refractive index 1.5 and refracting angle 600. Calculate... View Article
A thin convex lens is made of two materials with refractive indices n1 and n2 .
A thin convex lens is made of two materials with refractive indices n1 and n2 as shown in the figure.... View Article
Three coins are tossed at once. What is the probability of getting at least two tails?
When three coins are tossed at once, the sample space is {HHH, HHT, HTH, THH, TTH, THT, HTT, TTT}. I.e.,... View Article
Three coins are tossed simultaneously. what is the probability of (i) getting at most two heads (ii) getting at most two tails.
When three coins are tossed simultaneously, the sample space becomes 23 = 8 S = {HHH, HHT, HTH, THH, TTH,... View Article
If the radius of a circle is diminished by 10%, then its area is diminished by:
Let the radius of the circle be “r”. So, the area of a circle = πr2 If the radius of... View Article
One Angstrom is equal to how many meters?
One Angstrom is equal to 10-10 meters. It means that 1 Angstrom = 0.0000000001 meters The angstrom is the unit... View Article
The diagonals of a parallelogram are represented by R1 = 3i+2j-7k and R2 = 5i+6j-3k. Find the area of parallelogram.
Given diagonals of the parallelogram are: \(\begin{array}{l}R_{1} = 3\hat{i}+2\hat{j}-7\hat{k} \end{array} \), \(\begin{array}{l}R_{2} = 5\hat{i}+6\hat{j}-3\hat{k}\end{array} \) As we know, the area... View Article
In a △ABC, DE ∥ BC. If AD = x, DB = x – 2, AE = x + 2 and EC = x – 1, find the value of x.
Given that ABC is a triangle where DE || BC and it is shown as follows: Also, given that AD... View Article
the stability of 6 oxidation state in group 16 decreases down the group.
The electrical configuration of Group 16 components is ns2np4. As a result, they should have a maximum oxidation state of... View Article
when the densities of the ore particles and gangue particles are different, then the ore is concentrated by
Levigation is based on the difference in densities of the metallic ore and gangue particles. Powdered ore is treated with... View Article
an electron in hydrogen like atom is in an excited state. it has a total energy of – 3.4 ev. the de broglie wavelength of the electron is nearly
Energy of electron in hydrogen-like atom, En = −Z^(2)Rhc/n^(2) = −3.4eV Kinetic energy of electron in hydrogen-like atom is equal... View Article
gold (atomic radius= 0.144 nm) crystallises in fcc. the length of a side of the unit cell will be
For a face centred unit cell. r = a/2√2 or a = 2√2r a = 2 × 1.4142 × (0.144nm)... View Article
Which of the following has highest bond angle? a) BBr3 b) CS2 c) SO2 d) SF4
a) BBr3 b) CS2 c) SO2 d) SF4 The bond angle around C in CS2 (S=C=S) is 180 degree which... View Article
in an adiabatic process, pressure is increased by . if then the volume in the process is decreased by about
For an adiabatic process, pVγ = constant (say C) Here, γ = Cp/CV = 3/2 Therefore, pV^(3/2) = C ⇒... View Article
consider the following reaction at equilibrium pcl5 (g) pcl3 (g) cl2(g). if some amount of argon gas is added to the reaction mixture at constant pressure then
PCl5 (g) ⇔ PCl3 (g) + Cl2(g) The addition of a constant amount of inert gas has no effect on... View Article
Green colour solution is due to the formation
The green colour of the solution is due to the formation of iron sulphate. Metal oxides always reacts with acid... View Article
Assertion: on reacting with water, calcium starts floating over water. Reason: calcium reacts with cold water at room temperature.
Both the Assertion and Reason are true but Reason is not the correct explanation of the Assertion. Calcium reacts with... View Article
