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Engineering
16 Views   |   5 days, 14 hours ago
 what is the hybridisation and structure  of     ?  

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S Sivani Reddy Kesara
Answered 2 days, 23 hours ago
of what?  
Engineering
22 Views   |   6 days, 16 hours ago
Sir please tell the answer of this question and solving method. Two particles executes S.H.M. of same amplitude and frequency along the same straight line. They pass one another when going in opposite directions, and each time their displacement is half of their amplitude. The phase difference between them is  

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S sudhir
Answered 6 days, 16 hours ago

Engineering
45 Views   |   1 week, 3 days ago

If an equilateral triangle, having vertex at the (2,-1), has a side along the line, x+y=2, then the area (in sq. units) of this triangle is :

 

  • Option 1)

    3\sqrt{6}

  • Option 2)

    6

  • Option 3)

    6\sqrt{3}

  • Option 4)

    \frac{9}{2}\sqrt{3}

 

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S solutionqc
Answered 1 week, 2 days ago
Option 1) Option 2) 6 Option 3) Option 4)
Engineering
70 Views   |   1 week, 3 days ago

If the sum of the first 15 terms of the series 3+7+14+24+37+.......is 15K, then k is equal to :

  • Option 1)

    126

  • Option 2)

    122

  • Option 3)

    81

  • Option 4)

    119

 

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S solutionqc
Answered 1 week, 2 days ago
Use Summation of series of natural numbers -   - wherein Sum of first n natural numbers    and   Summation of series of natural numbers -   - wherein Sum of  squares of first n natural numbers     3+7+14+24+37 ----------15K Let Tn=an2+bn+c            because difference is in A.P: [4,7,10,13-----------------] at n=1     ------(i)     n=2      -------(ii)     n=3        -------(iii)    ...
Engineering
64 Views   |   1 week, 4 days ago

Statement 1: An equation of a common tangent to the parabolay^{2}= 16\sqrt{3}x  and the ellipse 2x^{2}+y^{2}= 4 is y= 2x+2\sqrt{3}

Statement 2: If the line y= mx+\frac{4\sqrt{3}}{m},(m\neq 0) is a common tangent to the parabola

y^{2}= 16\sqrt{3}x and the ellipse 2x^{2}+y^{2}= 4, then m satisfies  m^{4}+2m^{2}= 24

  • Option 1)

    Statement 1 is false, statement 2 is true

  • Option 2)

    Statement 1 is true, statement 2 is true; statement 2 is a correct explanation for statement 1

  • Option 3)

    Statement 1 is true, statement 2 is true; statement 2 is not a correct explanation for statement 1

  • Option 4)

    Statement 1 is true, statement 2 is false

 

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S solutionqc
Answered 1 week, 3 days ago
As we learnt in Equation of tangent - - wherein Tengent to is slope form.       Statement 1 :   Statement 2 : If is a common tangent to and ellipse From (i)     statement 2 is a correct explanation for statement 1.     Option 1) Statement 1 is false, statement 2 is true This option is incorrect. Option 2) Statement 1 is true, statement 2 is true; statement 2 is a correct...
Engineering
64 Views   |   1 week, 4 days ago

 The eccentricity of an ellipse whose centre is at the origin is \frac{1}{2}

 If one of its directrices  is x=−4, then the equation of the normal to it at

\left ( 1,\frac{3}{2} \right ) is:

 

  • Option 1)

    4x-2y=1

  • Option 2)

    4x+2y=7

  • Option 3)

    x+2y=4

  • Option 4)

    2y-x=2

 

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S solutionqc
Answered 1 week, 3 days ago
As learned in concept Eccentricity - - wherein For the ellipse      and Equation of directrices - - wherein For the ellipse       we have  &  x=-4   From this we can calculate the value of a  so a=4 Now,   Hence, Equation of ellipse is- Differentiate to get the value of slope-  So slope at given point      is  Now by using the formula of normal of a equation-    normal at point    is ...
Medical
58 Views   |   1 week, 4 days ago

Fusion reaction takes place at high temperature because:

  • Option 1)

    Molecules break up at high temperature

  • Option 2)

    Nuclei break up at high temperature

  • Option 3)

    Atoms get ionized at high temperature

  • Option 4)

    Kinetic energy is high enough to overcome the coulomb repulsion between nuclei

 

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S shreya bhatewara
Answered 6 days, 22 hours ago

molecules break up at high temperature

 

 

Engineering
11 Views   |   1 week, 5 days ago

The correct order of -I effect is 

  • Option 1)

    -O^-> -COO^-> -C\left ( CH_{3} \right )_{3}> -CH_{3} > -D

     

     

     

  • Option 2)

    -O^-< -COO^-< -C\left ( CH_{3} \right )_{3}< -CH_{3} < -D

  • Option 3)

    -O^-> -COO^-> -C\left ( CH_{3} \right )_{3}> -CH_{3} < -D

  • Option 4)

    -COO^-> -O^-> -C\left ( CH_{3} \right )_{3} > -D> -CH_{3}

 

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S SudhirSol
Answered 1 week, 4 days ago
As we learned   Positive inductive effect - Having less tendency to attractive   e- towards itself as compared to the Hydrogen atom - wherein    The correct order of +I effect is  D is slightly more electron releasing than H.   Option 1)       Option 2) Option 3) Option 4)
Engineering
29 Views   |   1 week, 5 days ago

 Let G be the geometric mean of two positive numbers a and b, and M be the arithmetic mean of  \frac{1}{a}  and \frac{1}{b}

if \frac{1}{M}:G  is 4:5 then a:b can be:

  • Option 1)

    1:4

  • Option 2)

    1:2

  • Option 3)

    2:3

  • Option 4)

    3:4

 

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S solutionqc
Answered 1 week, 4 days ago
As we learnt in  Arithmetic mean of two numbers (AM) - - wherein It is to be noted that the sequence a, A, b, is in AP where, a and b are the two numbers. and Geometric mean of two numbers (GM) - - wherein It is to be noted that a,G,b are in GP and a,b are two non - zero numbers.   Given G2 = ab and                                 Option 1) Option 2) Option 3) Option 4)
Engineering
91 Views   |   1 week, 5 days ago

The sum of the first 20 terms common between the series 3+7+11+15+..... and 1+6+11+16+..... , is :

  • Option 1)

    4000

  • Option 2)

    4020

  • Option 3)

    4200

  • Option 4)

    4220

 

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S solutionqc
Answered 1 week, 4 days ago
Use Sum of n terms of an AP -   and Sum of n terms of an AP   - wherein first term common difference number of terms   series are 3,7,11,15,19,23,27,31.............. and 1,6,11,16,21,26,31.................... So common terms are 11,31,............                                            Option 1) 4000 Option 2) 4020 Option 3) 4200 Option 4) 4220
Engineering
61 Views   |   1 week, 5 days ago
Find the last three digits of 17^256

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P Pankaj
Answered 1 week, 5 days ago
@Shekhar Solution: We have 172 Now, 17256 2 128 = (17 ) 289 = (290 - 1)128 -290 - (128) (290) +1 128C 2 126(290) 12SC127(290) + 1 , where m is a positive integer. = 1000 m + (128) (290) [(127) (145) - 1] + 1 = 1000 m + (128) (290) (18414) + 1 = 1000 Cm + 683527] + 680 + 1 = 1000 [m + 683527] + 681 Thus, the last three digits of 17256 are 681
Engineering
59 Views   |   1 week, 6 days ago

which interval probability lies.

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H Himanshu Meshram
Answered 1 week, 6 days ago
@_Rakesh, Minimum value of probability of an event is  0 and maximum ia 1. Probabilty of an event or intervel lies in [0,1]
Engineering
55 Views   |   1 week, 6 days ago
find the general trem in the expansion of (x^{2} - yx)^{12}

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H Himanshu Meshram
Answered 1 week, 6 days ago
Engineering
53 Views   |   1 week, 6 days ago
Let  f(x)=2^{10}x+1 and g(x)=3^{10}x+1. If (fog)(x)=x , then x is equal to :

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S Satyajeet kumar
Answered 1 week, 6 days ago
Engineering
75 Views   |   1 week, 6 days ago
sir,what is releation between  emf and p.d ,from chapter current electricity, plz explain me those releation

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A Avinash Dongre
Answered 1 week, 6 days ago

@Nilesh 

The potential difference accross the terminals of a cell when it is not supplying any current is called e.m.f while 

The voltage accross the terminals of a cell when it is supplying current to external resistance is known as Potential Difference .

When the cell is being charged

E=V-iR

(E<V)  

 

 

 

 

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Engineering
67 Views   |   1 week, 6 days ago
Sir, I have a doubt about the question given in concept of charge conservation. Can't mass also be conserved?

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A Avinash Dongre
Answered 1 week, 6 days ago
@Shashank The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as system's mass cannot change, so quantity cannot be added nor removed. Hence, the quantity of mass is conserved over time.
Engineering
63 Views   |   1 week, 6 days ago
I want to calculate resultant resistance  then how can calculate? 

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A Avinash Dongre
Answered 1 week, 6 days ago

@Nilesh

Strategy for simplifying a resistor network

  • Begin as far away as possible from the circuit location in question.
  • Replace series or parallel resistors with their equivalent resistor.
  • Continue, moving left until a single equivalent resistor represents the entire resistor network.
Engineering
61 Views   |   1 week, 6 days ago
plz help me to solve questions about effective resistance in both series  plz help me

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A Avinash Dongre
Answered 1 week, 6 days ago

@Nilesh  When resistors are connected in series, the current through each resistor is the same and 

 the total potential difference across all the resistors is equal to the sum of the potential differences across each resistor.

For example when resistor R_{1} , R_{2} ,R_{3} are connected in sereis then 

R_{eq} = R_{1} + R_{2} + R_{3}

1, 2,
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Engineering
75 Views   |   1 week, 6 days ago
 The radius and mass of earth are increased by 0.5%. Which of the following statements are true at the surface of the earth? A) g will increase B)             g will decrease C)             Escape velocity will remain unchanged D)             Potential energy will remain unchanged

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V Vishwash Tetarwal
Answered 1 week, 3 days ago

g = \frac{GM}{{R}^{2}}

{v}_{e} = \sqrt{\frac{2GM}{R}}

U=\frac{-GMm}{R}

g\propto \frac{M}{{{R}^{2}}} 

{{v}_{e}}\propto \sqrt{\frac{M}{R}}

U\propto \frac{M}{R}

after increasing by 0.5% 

M_{new} = M+(0.5/100)M=1.005M

R_{new} = R+(0.5/100)R=1.005R

So If both mass and radius are increased by 0.5% then v_{e} and U remains unchanged where as g will be decreased.

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Engineering
72 Views   |   1 week, 6 days 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

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V Vishwash Tetarwal
Answered 1 week, 3 days ago

 

the body is positively charged before grounding and after that electrons flows from earth to body and body becomes neutral.

the Body is positively charged before grounding because If a body is grounded and electrons starts flowing into the body from then Earth this would mean that the charges inside the body are attracting the negative electrons from Earth as a potential difference is being developed at the two ends, the Earth and the body.

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