Maths-
The pole of the straight line 9x + y – 28 = 0 with respect to the circle is
Maths-General
- (–3, 1)
- (1, 3)
- (3, – 1)
- (3, 1)
Answer:The correct answer is: (3, – 1)
Book A Free Demo

Grade*
Select Grade
Related Questions to study
physics-
The distance between a point source of light and a screen which is 60 cm is increased to 180 cm. The intensity on the screen as compared with the original intensity will be
The distance between a point source of light and a screen which is 60 cm is increased to 180 cm. The intensity on the screen as compared with the original intensity will be
physics-General
physics-
Three rods of equal length
are joined to form an equilateral triangle
O is the mid point of
Distance
remains same for small change in temperature. Coefficient of linear expansion for
and
is same,
but that for
is
Then

Neglecting
Three rods of equal length
are joined to form an equilateral triangle
O is the mid point of
Distance
remains same for small change in temperature. Coefficient of linear expansion for
and
is same,
but that for
is
Then

physics-General
Neglecting
physics-
A point source causes photoelectric effect from a small metal plate Which of the following curves may represent the saturation photocurrent as a function of the distance between the source and the metal?

A point source causes photoelectric effect from a small metal plate Which of the following curves may represent the saturation photocurrent as a function of the distance between the source and the metal?

physics-General
physics-
One of the following figures respesents the variation of particle momentum with associated de Broglie wavelength
a) 
b) 
c) 

One of the following figures respesents the variation of particle momentum with associated de Broglie wavelength
a) 
b) 
c) 

physics-General
physics-
An electric lamp is fixed at the ceiling of a circular tunnel as shown is figure. What is the ratio the intensities of light at base A and a point B on the wall


An electric lamp is fixed at the ceiling of a circular tunnel as shown is figure. What is the ratio the intensities of light at base A and a point B on the wall

physics-General

maths-
If the line y = x + 3 meets the circle
at A and B, then equation of the circle on AB as diameter is
If the line y = x + 3 meets the circle
at A and B, then equation of the circle on AB as diameter is
maths-General
physics-
The figure shows a system of two concentric spheres of radii
and
and kept at temperatures
and
respectively. The radial rate of flow of heat in a substance between the two concentric spheres, is proportional to

To measure the radial rate of heat flow, we have to go for integration technique as here the area of the surface through which heat will flow is not constant.

Let us consider an element (spherical shell) of thickness d
and radius
as shown in figure. Let us first find the equivalent thermal resistance between inner and outer sphere.
Resistance of shell=


=
Rate of heat flow = H
=
=


Let us consider an element (spherical shell) of thickness d
Resistance of shell=
=
Rate of heat flow = H
=
=
The figure shows a system of two concentric spheres of radii
and
and kept at temperatures
and
respectively. The radial rate of flow of heat in a substance between the two concentric spheres, is proportional to

physics-General
To measure the radial rate of heat flow, we have to go for integration technique as here the area of the surface through which heat will flow is not constant.

Let us consider an element (spherical shell) of thickness d
and radius
as shown in figure. Let us first find the equivalent thermal resistance between inner and outer sphere.
Resistance of shell=


=
Rate of heat flow = H
=
=


Let us consider an element (spherical shell) of thickness d
Resistance of shell=
=
Rate of heat flow = H
=
=
physics-
Two circular discs A and B with equal radii are blackened. They are heated to some temperature and are cooled under identical conditions. What inference do you draw from their cooling curves?

According to Newton’s law of cooling, rate of cooling is given by

Where c is specific heat of material.
or
rate of cooling varies inversely as specific heat. From the graph, for A rate of cooling is larger. Therefore, specific heat of A is smaller.
Where c is specific heat of material.
or
Two circular discs A and B with equal radii are blackened. They are heated to some temperature and are cooled under identical conditions. What inference do you draw from their cooling curves?

physics-General
According to Newton’s law of cooling, rate of cooling is given by

Where c is specific heat of material.
or
rate of cooling varies inversely as specific heat. From the graph, for A rate of cooling is larger. Therefore, specific heat of A is smaller.
Where c is specific heat of material.
or
physics-
Which of the curves in figure represents the relation between Celsius and Fahrenheit temperatures

Which of the curves in figure represents the relation between Celsius and Fahrenheit temperatures

physics-General
maths-
The area of circle centred at (1, 2) and passing through (4, 6) is
The area of circle centred at (1, 2) and passing through (4, 6) is
maths-General
physics-
Three rods of same dimensions are arranged as shown in figure. They have thermal conductivities
and
. The points
and
are maintained at different temperatures for the heat to flow at the same rate along
and
then which of the following options is correct

The given arrangement of rods can be redrawn as follows

It is given that


It is given that
Three rods of same dimensions are arranged as shown in figure. They have thermal conductivities
and
. The points
and
are maintained at different temperatures for the heat to flow at the same rate along
and
then which of the following options is correct

physics-General
The given arrangement of rods can be redrawn as follows

It is given that


It is given that
physics-
In the following diagram if
then 
In the following diagram if
then 
physics-General
physics-
The maximum kinetic energy (Ek ) of emitted photoelectrons against frequency v of incident radiation is plotted as shown in fig The slope of the graph is equal to

The maximum kinetic energy (Ek ) of emitted photoelectrons against frequency v of incident radiation is plotted as shown in fig The slope of the graph is equal to

physics-General
physics-
Which of the substance
or
has the highest specific heat? The temperature
time graph is shown

Substances having more specific heat take longer time to get heated to a higher temperature and longer time to get cooled.

If we draw a line parallel to the time axis then it cuts the given graphs at three different points. Corresponding points on the times axis shows that


If we draw a line parallel to the time axis then it cuts the given graphs at three different points. Corresponding points on the times axis shows that
Which of the substance
or
has the highest specific heat? The temperature
time graph is shown

physics-General
Substances having more specific heat take longer time to get heated to a higher temperature and longer time to get cooled.

If we draw a line parallel to the time axis then it cuts the given graphs at three different points. Corresponding points on the times axis shows that


If we draw a line parallel to the time axis then it cuts the given graphs at three different points. Corresponding points on the times axis shows that
maths-
The equation of the circumcircle of the triangle formed by the lines
and y=0 is
The equation of the circumcircle of the triangle formed by the lines
and y=0 is
maths-General