# Q&A - Ask Doubts and Get Answers

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Engineering
1 Views   |   2 weeks ago
Hello   When a body is earth connected then the electrons from the earth flow into the body...that means the body is uncharged right?? When the body is earth connected , how can the body be positively charged? Like I meant the electrons doesn't flow as it remains unchanged Hello anybody there   Plzz reply
Engineering
55 Views   |   2 weeks, 1 day ago

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A Amit Kumar
Answered 1 week, 3 days ago
An asymmetric carbon atom (chiral carbon) is a carbon atom that is attached to four different types of atoms or groups of atoms.For example It's mirror image can't be impose
Engineering
22 Views   |   2 weeks, 1 day ago

answer for this qns with soln

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V Vishwash Tetarwal
Answered 1 week, 3 days ago
=plank's constant  =speed of light   = wavelength E = 14.4KeV = 14400eV so As we can see   means that it belongs to Gamma Rays
Medical
25 Views   |   2 weeks, 2 days ago
Engineering
15 Views   |   2 weeks, 2 days ago

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V Vishwash Tetarwal
Answered 1 week, 3 days ago
G = Gravitational constant  = mass of earth r = radius of earth At height h, acceleration due to gravity is if
Engineering
8 Views   |   2 weeks, 5 days ago

An electromagnetic wave of frequency 1x1014 hertz is propagating along z - axis. The amplitude of electric field is 4 V/m.          If  = 8.8 x 10-12 C2/N-m2, then average energy density of electric field will be :

A.

35.2 x 10-10 J/m3

B.

35.2 x 10-11 J/m3

C.

35.2 x 10-12 J/m3

D.

35.2 x 10-13 J/m3

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V Vishwash Tetarwal
Answered 1 week, 2 days ago
Average Energy density of Electromagnetic wave is given by
Engineering
9 Views   |   2 weeks, 6 days ago

N=2 is chosen as reference of electrostatic potential energy in an he+ ion... Assuming Bohr model to be valid calculate the ionisation energy for the ion in its ground state ....

Engineering
7 Views   |   2 weeks, 6 days ago

In the photoelectric experiment the collector plate is at 5V wrt the anode made of metal with work function 5ev ..the metal surface is illuminated by monochromatic light of wavelength 1000 Angstrom the minimum and maximum kinetic energy of electron teaching at collector.is

Medical
2 Views   |   2 weeks, 6 days ago
Engineering
2 Views   |   2 weeks, 6 days ago

Question

From a sphere of mass M and radius R, a  smaller sphere of radius  is carved out such that the cavity made in the original sphere is between its centre and the periphery. (See figure). For the configuration in the figure where the distance between the centre of the original sphere and the removed sphere is 3R, the gravitational force between the two spheres is :

Question

From a sphere of mass M and radius R, a  smaller sphere of radius  is carved out such that the cavity made in the original sphere is between its centre and the periphery. (See figure). For the configuration in the figure where the distance between the centre of the original sphere and the removed sphere is 3R, the gravitational force between the two spheres is :

Engineering
4 Views   |   2 weeks, 6 days ago

My question is how ratio can a physical quantity. In my understanding physical quantity must have magnitude (a number) and unit but sometimes ratio doesnt have any units.

Simliarly how just a scalar can be a physical quantity if theres no unit associated.

Guide me a good defination of physical quantity.

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V Vishwash Tetarwal
Answered 1 week, 2 days ago
Basic Definition - A physical quantity is a physical property of a phenomenon, body, or substance, that can be quantified by measurement Neither the name of a physical quantity, nor the symbol used to denote it, implies a particular choice of unit, though SI units are usually preferred and assumed today due to their ease of use and all-round applicability.  for instance, say someone tells you...
Engineering
79 Views   |   3 weeks ago

If the arithmetic mean of two numbers a and b, a > b > 0, is five times their geometric

mean, then $\frac{a+b}{a-b}$     is equal to:

• Option 1)

• Option 2)

• Option 3)

• Option 4)

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S Shantanu
Answered 2 weeks, 5 days ago

Valve surrounding opening of the coronary sinus is.........

A) eustachian valve    b)  thebasious valve

C)mitral valve               d)tricuspid  valve

Medical
83 Views   |   3 weeks ago

Which one of the following is not an essential mineral element for plants while the remaining three are?

• Option 1)

Iron(b)

• Option 2)

Manganese

• Option 3)

• Option 4)

Phosphorus

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S shreya bhatewara
Answered 6 days, 22 hours ago

i was wrong

phosphorus is present  in the meristem in the plants body

Engineering
49 Views   |   3 weeks ago

Let ABC be a triangle whose circumcentre is at P.  If the position vectors of A, B, C

and P are

respectively, then the position vector of the orthocentre of this triangle, is :

• Option 1)

• Option 2)

• Option 3)

• Option 4)

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A Anurag Uikey
Answered 1 week, 6 days ago
Engineering
49 Views   |   3 weeks ago

If (10)9 + 2(11)1   (10)8 + 3(11)2  (10)7 +......  +10 (11)9 = k (10)9, then k is equal to :

• Option 1)

100

• Option 2)

110

• Option 3)

• Option 4)

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S solutionqc
Answered 2 weeks, 6 days ago
Use Sum of n terms of a GP -   - wherein first term common ratio number of terms        and   (10)9 + 2(11)1 (10)8 + 3(11)2 (10)7 +......  +10 (11)9 = k(10)9 Take common 109    Subtract   Option 1) 100 Option 2) 110 Option 3) Option 4)
Engineering
48 Views   |   3 weeks ago

if          is real, then the point represented by the complex number lies

• Option 1)

either on the real axis or on a circle passing through the origin

• Option 2)

on a circle with centre at the origin

• Option 3)

either on the real axis or on a circle not passing through the origin

• Option 4)

on the imaginary axis

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S solutionqc
Answered 2 weeks, 6 days ago
Option 1) either on the real axis or on a circle passing through the origin Option 2) on a circle with centre at the origin Option 3) either on the real axis or on a circle not passing through the origin Option 4) on the imaginary axis
Engineering
28 Views   |   3 weeks ago

Let   be complex numbers such that    and  arg Then arg equals

• Option 1)

• Option 2)

• Option 3)

• Option 4)

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S solutionqc
Answered 2 weeks, 6 days ago
As we learnt in Property of Argument of a Complex Number - - wherein  and it is chosen such that Arg(z.w) lies in the principal value range of Argument.           Correct option is 1.   Option 1) Option 2) Option 3) Option 4)
Engineering
32 Views   |   3 weeks ago

The equation has

• Option 1)

infinite number of real roots

• Option 2)

no real roots

• Option 3)

exactly one real root

• Option 4)

exactly four real roots

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S solutionqc
Answered 2 weeks, 6 days ago
Option 1) infinite number of real roots Option 2) no real roots Option 3) exactly one real root Option 4) exactly four real roots
Engineering
27 Views   |   3 weeks ago

if   then a value of     :

• Option 1)

• Option 2)

• Option 3)

• Option 4)

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S solutionqc
Answered 2 weeks, 6 days ago
As we learnt in Square Root of a Complex Number - -    We have to find  Now        and    (Put - i at the place of i) Now x2 - y2 + i 2xy = 7 + 24 i Solve for x & y,   it is  Correct option is 1.   Option 1) This is the correct option. Option 2) This is an incorrect option. Option 3) This is an incorrect option. Option 4) This is an incorrect option.
Engineering
72 Views   |   3 weeks, 2 days ago

In the anion   the two carbon-­oxygen bonds are found to be of equal length. What is the reason for it?

• Option 1)

Electronic orbitals of carbon atom are hybridised.

• Option 2)

The bond is weaker than the bond

• Option 3)

The anion   has two resonating structures.

• Option 4)

The anion is obtained by removal of a proton from the acid molecule

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A Amit Kumar
Answered 1 week, 3 days ago

In HCOO-ion two carbon-oxygen bonds are found to be of equal length because this ion is stabilized by resonance and in resonance both C-O bonds have partial double bond character.

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