Physics-
General
Easy
Question
An electron which is initially at rest is accelerated through a potential difference of one volt. The energy acquired by the electron is
- 10–19J
- 1.6×10–19erg
- 1.6×10–19J
- zero
The correct answer is: 1.6×10–19J
Related Questions to study
physics-
A charge q is placed at the centre of the open end of a cylindrical vessel. The flux of the electric field through the surface of the vessel is

A charge q is placed at the centre of the open end of a cylindrical vessel. The flux of the electric field through the surface of the vessel is

physics-General
physics-
Fig. shows a distribution of charges. The flux of electric field due to these charges through the surface S is

Fig. shows a distribution of charges. The flux of electric field due to these charges through the surface S is

physics-General
physics-
As per fig. a point charge +q is placed at the origin O. Work done in taking another point charge –Q from the point A [Co-ordinates (0,a)] to another point B [Co-ordinates (a, 0)] along the straight path AB is :

As per fig. a point charge +q is placed at the origin O. Work done in taking another point charge –Q from the point A [Co-ordinates (0,a)] to another point B [Co-ordinates (a, 0)] along the straight path AB is :

physics-General
physics-
Three point charges are placed at the corners of an equilateral triangle. Assuming only electrostatic forces are acting.
Three point charges are placed at the corners of an equilateral triangle. Assuming only electrostatic forces are acting.
physics-General
Maths-
Let
be a cube root of unity and
be the set of all non‐singular matrices of the form
, where each of a, b and
is either
Then the number of distinct matrices in the set
is‐
Hence no of matrices formed = 2
Let
be a cube root of unity and
be the set of all non‐singular matrices of the form
, where each of a, b and
is either
Then the number of distinct matrices in the set
is‐
Maths-General
Hence no of matrices formed = 2
Maths-
Let A be a
matrix with non‐zero entries and let
, where I is
identity matrix Defi ne Tr(A)
of diagonal elements
and
determinant of matrix A
Statement 1: Tr(A) 
Statement 2: 
Hence option C is suitable option
Let A be a
matrix with non‐zero entries and let
, where I is
identity matrix Defi ne Tr(A)
of diagonal elements
and
determinant of matrix A
Statement 1: Tr(A) 
Statement 2: 
Maths-General
Hence option C is suitable option
maths-
If A
and I
, then which one of the following holds for all
, (by the principal of mathematical induction)
If A
and I
, then which one of the following holds for all
, (by the principal of mathematical induction)
maths-General
maths-
The equation
has a solution for (x, y, z) besides (0,0,0) The value of k equals
The equation
has a solution for (x, y, z) besides (0,0,0) The value of k equals
maths-General
maths-
If
, then 
If
, then 
maths-General
maths-
Matrix A is such that
, where I is the identity matrix The for

Matrix A is such that
, where I is the identity matrix The for

maths-General
maths-
Statement‐I:: If
is increasing function with concavity upwards, then concavity of
is also upwards
Statement‐II:: If
is decreasing function with concavity upwards, then concavity of
is also upwards.
Statement‐I:: If
is increasing function with concavity upwards, then concavity of
is also upwards
Statement‐II:: If
is decreasing function with concavity upwards, then concavity of
is also upwards.
maths-General
maths-
Statement‐I::
, where
is Napier
sconstant.
Statement‐II:: If f
and
is positive
, then
increases with concavity up
and any chord lies above the curve.
Statement‐I::
, where
is Napier
sconstant.
Statement‐II:: If f
and
is positive
, then
increases with concavity up
and any chord lies above the curve.
maths-General
maths-
The beds of two rivers (within a certain region) are a parabola
and a straight line y=x-2 These rivers are to be connected by a straight canal The coordinates of the ends of the shortest canal can be:
The beds of two rivers (within a certain region) are a parabola
and a straight line y=x-2 These rivers are to be connected by a straight canal The coordinates of the ends of the shortest canal can be:
maths-General
maths-
If f(x) is twice differentiable function f((1)=1, f(2)=4, f(3)=9
If f(x) is twice differentiable function f((1)=1, f(2)=4, f(3)=9
maths-General
maths-
If f(x)
, then f(x)
If f(x)
, then f(x)
maths-General