Physics-
General
Easy
Question
Six charges are placed at the corner of a regular hexagon as shown. If an electron is placed at its centre O, force on it will be:
- Zero
- Along OF
- Along OC
- None of these
The correct answer is: None of these
Related Questions to study
physics-
Four charges are arranged at the corners of a square ABCD, as shown. The force on a +ve charge kept at the centre of the square is
Four charges are arranged at the corners of a square ABCD, as shown. The force on a +ve charge kept at the centre of the square is
physics-General
chemistry-
All the boron trihalides except B may be prepared by direct reaction between the elements Boron trihalides consist of trigonal - planar BX3 molecules Unlike the halides of the other elements in the group they are monomeric in the gas, liquid and Sol. id states, BF3 and BCl3 are gases, BBr3 3Iis a volatile liquid and B is a Sol. Id Boron trihalides are Lewis acids because they form simple Lewis complexes with suitable bases, as in the reaction : 
However, boron chlorides, bromides and iodides are susceptible (sensitive) to protoly sis by mild proton sources such as water, alcohols and even amines; for example BCl3 undergoes rapid hydrolysis: 
It is supposed that the first step in the above reaction is the formation of the complex 
which then eliminates HCl and reacts further with water
Which of the following is the correct prediction about observed B–X bond length, in BX3 molecules ?
All the boron trihalides except B may be prepared by direct reaction between the elements Boron trihalides consist of trigonal - planar BX3 molecules Unlike the halides of the other elements in the group they are monomeric in the gas, liquid and Sol. id states, BF3 and BCl3 are gases, BBr3 3Iis a volatile liquid and B is a Sol. Id Boron trihalides are Lewis acids because they form simple Lewis complexes with suitable bases, as in the reaction : However, boron chlorides, bromides and iodides are susceptible (sensitive) to protoly sis by mild proton sources such as water, alcohols and even amines; for example BCl3 undergoes rapid hydrolysis: It is supposed that the first step in the above reaction is the formation of the complex which then eliminates HCl and reacts further with water
Which of the following is the correct prediction about observed B–X bond length, in BX3 molecules ?
chemistry-General
chemistry-
Statement-1 : Xenon forms fluorides
Statement-2 : 5 d-orbitals are available in xenon for valence shell expansion
Statement-1 : Xenon forms fluorides
Statement-2 : 5 d-orbitals are available in xenon for valence shell expansion
chemistry-General
chemistry-
Statement-1 : H3PO2 is a weak monobasic acid and is also strong reducing in nature
Statement-2 : 
Statement-1 : H3PO2 is a weak monobasic acid and is also strong reducing in nature
Statement-2 :
chemistry-General
chemistry-
Statement-1 : Electrovalency of oxygen is two (O2-)
Statement-2 : Dinegative anion of oxygen (O2-) is quite common but dinegative anion of sulphur (S2-) is less common
Statement-1 : Electrovalency of oxygen is two (O2-)
Statement-2 : Dinegative anion of oxygen (O2-) is quite common but dinegative anion of sulphur (S2-) is less common
chemistry-General
chemistry-
Statement-1 : H3PO3 is a dibasic acid and shows reducing characterStatement-2 :H3PO3 contains two OH– groups and one hydrogen atom directly attached to P atom
Statement-1 : H3PO3 is a dibasic acid and shows reducing characterStatement-2 :H3PO3 contains two OH– groups and one hydrogen atom directly attached to P atom
chemistry-General
chemistry-
Statement-1 : PbI4 is a stable compound.
Statement-2 : Pb2+ ions with concentrated Solution of KI forms a Sol. uble complex
Statement-1 : PbI4 is a stable compound.
Statement-2 : Pb2+ ions with concentrated Solution of KI forms a Sol. uble complex
chemistry-General
maths-
Consider the following statements 
and 
: S: Both 
x&cos 
are decreasing functions in the interval 
.
R: If a differentiable function decreases in an interval 
, then its derivative also decreases in Which of the following is true ?
Consider the following statements and : S: Both x&cos are decreasing functions in the interval .
R: If a differentiable function decreases in an interval , then its derivative also decreases in Which of the following is true ?
maths-General
maths-
A triangular park is enclosed on two sides by a fence and on the third side by a straight river bank The two sides having fence are of same length The maximum area enclosed by the park is‐
A triangular park is enclosed on two sides by a fence and on the third side by a straight river bank The two sides having fence are of same length The maximum area enclosed by the park is‐
maths-General
maths-
Let 
be a thrice derivable fu nction such that 
where 
Also the equations 
(x)
O& 
have no common roots.
Statement‐I:: The equation 
has atleast 5 real roots.
Statement‐II:: The equation 
has atleast 3 real distinct roots&if has 
real distinct roots, then 
has atleast k‐l distinct roots.
Let be a thrice derivable fu nction such that where Also the equations (x)O& have no common roots.
Statement‐I:: The equation has atleast 5 real roots.
Statement‐II:: The equation has atleast 3 real distinct roots&if has real distinct roots, then has atleast k‐l distinct roots.
maths-General
maths-
Statement‐I:: The largest term in the sequence 
is the 
term.
’
Statement‐II:: The function 
attains local maxima at 
Statement‐I:: The largest term in the sequence is the term.
’
Statement‐II:: The function attains local maxima at
maths-General
maths-
The area of the region bounded in first quadrant by 
and the axis of ordinates is:
The area of the region bounded in first quadrant by and the axis of ordinates is:
maths-General
maths-
The area of the region bounded by the curve 
is to that of the circle whose radius is 
, is given by the ratio
The area of the region bounded by the curve is to that of the circle whose radius is , is given by the ratio
maths-General
maths-
Statement‐I : The area of the curve 
from 
to 
will be more than that of curve 
from to 
Statement‐II : 
if 
Statement‐I : The area of the curve from to will be more than that of curve from to
Statement‐II : if
maths-General
maths-
The area bounded by the curve y=f(x) , the ‐axis &the ordinates x=1 &x =b is (b‐l)sin 
Then f(x) is:
The area bounded by the curve y=f(x) , the ‐axis &the ordinates x=1 &x =b is (b‐l)sin Then f(x) is:
maths-General
