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.
