Maths-
General
Easy
Question
In a packet of 40 pens, 12 are red. So, what % age are red pens?
- 33%
- 27%
- 30%
- 21%
The correct answer is: 30%
Given:- Total no. of pens =40.
Number of a red pens =12
% age of red pens =
×100


Related Questions to study
Chemistry-
Consider the following compounds, which of these will release CO2 with 5% NaHCO3 ?
i) 
ii) 
iii) 
Consider the following compounds, which of these will release CO2 with 5% NaHCO3 ?
i) 
ii) 
iii) 
Chemistry-General
Chemistry-
Identify the product' Y' in the following reaction sequence:

Identify the product' Y' in the following reaction sequence:

Chemistry-General
Chemistry-
In homogeneous catalytic reactions, there are three alternative paths A,B and C (shown in the figure) which one of the following indicates the relative ease with which the reaction can take place?

In homogeneous catalytic reactions, there are three alternative paths A,B and C (shown in the figure) which one of the following indicates the relative ease with which the reaction can take place?

Chemistry-General
Chemistry-
In a spontaneous adsorption process
In a spontaneous adsorption process
Chemistry-General
Chemistry-
Graph between log
and log P is a straight line at angle 0 45 with intercept OA as shown Hence ,
at a pressure of 2 atm is

Graph between log
and log P is a straight line at angle 0 45 with intercept OA as shown Hence ,
at a pressure of 2 atm is

Chemistry-General
Maths-
If
and
then
If
and
then
Maths-General
Maths-
Assertion : For
the volume of the parallel piped formed by vectors
and
is maximum (The vectors form a right-handed system)
Reason: The volume of the parallel piped having three coterminous edges
and 
For such questions, we should know the formula of a parallelepiped. We should also know how to take a scalar product.
Assertion : For
the volume of the parallel piped formed by vectors
and
is maximum (The vectors form a right-handed system)
Reason: The volume of the parallel piped having three coterminous edges
and 
Maths-General
For such questions, we should know the formula of a parallelepiped. We should also know how to take a scalar product.
Maths-
Assertion (A): Let
. If
such that
is collinear with
and
is perpendicular to
is possible, then
.
Reason (R): If
and
are non-zero, non-collinear vectors, then
can be expressed as
where
is collinear with
and
is perpendicular to 
Assertion (A): Let
. If
such that
is collinear with
and
is perpendicular to
is possible, then
.
Reason (R): If
and
are non-zero, non-collinear vectors, then
can be expressed as
where
is collinear with
and
is perpendicular to 
Maths-General
Maths-
Statement
If
are distinct non-negative numbers and the vectors â
and
are coplanar then
is arithmetic mean of
and
.
Statement -2: Parallel vectors have proportional direction ratios.
Statement
If
are distinct non-negative numbers and the vectors â
and
are coplanar then
is arithmetic mean of
and
.
Statement -2: Parallel vectors have proportional direction ratios.
Maths-General
Maths-
If
and
is a vector satisfying
.
Assertion
can be expressed in terms of
and
.
Reason 
If
and
is a vector satisfying
.
Assertion
can be expressed in terms of
and
.
Reason 
Maths-General
Maths-
If
are non-zero vectors such that
then
Assertion
: Least value of
is 
Reason (R): The expression
is least when magnitude of
is 
If
are non-zero vectors such that
then
Assertion
: Least value of
is 
Reason (R): The expression
is least when magnitude of
is 
Maths-General
Maths-
Statement- 1: If
and
and
, then there exist real numbers
,
such that

Statement- 2:
are four vectors in a 3 - dimensional space. If
are non-coplanar, then there exist real numbers
such that 
Statement- 1: If
and
and
, then there exist real numbers
,
such that

Statement- 2:
are four vectors in a 3 - dimensional space. If
are non-coplanar, then there exist real numbers
such that 
Maths-General
Maths-
Statement-
:If
are non-collinear points. Then every point
in the plane of
, can be expressed in the form 
Statement-
:The condition for coplanarity of four points
is that there exists scalars
not all zeros such that
where
.
Statement-
:If
are non-collinear points. Then every point
in the plane of
, can be expressed in the form 
Statement-
:The condition for coplanarity of four points
is that there exists scalars
not all zeros such that
where
.
Maths-General
Maths-
Assertion (A): The number of vectors of unit length and perpendicular to both the vectors.
and
is zero Reason
(R):
and
are two non-zero and non-parallel vectors it is true that
is perpendicular to the plane containing
and 
Assertion (A): The number of vectors of unit length and perpendicular to both the vectors.
and
is zero Reason
(R):
and
are two non-zero and non-parallel vectors it is true that
is perpendicular to the plane containing
and 
Maths-General
Maths-
The value of
for which the straight lines
and
are coplanar is
For such questions, we should know the condition for two lines to be coplanar. We should also know about the scalar triple product.
The value of
for which the straight lines
and
are coplanar is
Maths-General
For such questions, we should know the condition for two lines to be coplanar. We should also know about the scalar triple product.