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?

Physics-General
- c
- d
- a
- b
Answer:The correct answer is: d
Book A Free Demo

Grade
Select Grade
Related Questions to study
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-
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-
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 pole of the straight line 9x + y – 28 = 0 with respect to the circle is
The pole of the straight line 9x + y – 28 = 0 with respect to the circle is
maths-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-
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 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
maths-
In centre of the triangle formed by the lines y = x, y = 3x and y = 8 – 3x is
In centre of the triangle formed by the lines y = x, y = 3x and y = 8 – 3x is
maths-General
physics-
A lamp rated at 100 cd hangs over the middle of a round table with diameter 3 m at a height of 2 m. It is replaced by a lamp of 25 cd and the distance to the table is changed so that the illumination at the centre of the table remains as before. The illumination at edge of the table becomes X times the original. Then X is
A lamp rated at 100 cd hangs over the middle of a round table with diameter 3 m at a height of 2 m. It is replaced by a lamp of 25 cd and the distance to the table is changed so that the illumination at the centre of the table remains as before. The illumination at edge of the table becomes X times the original. Then X is
physics-General
physics-
Five lumen/watt is the luminous efficiency of a lamp and its luminous intensity is 35 candela. The power of the lamp is
Efficiency of light source
..... (i)
and
..... (ii)
From equation (i) and (ii)
.
and
From equation (i) and (ii)
Five lumen/watt is the luminous efficiency of a lamp and its luminous intensity is 35 candela. The power of the lamp is
physics-General
Efficiency of light source
..... (i)
and
..... (ii)
From equation (i) and (ii)
.
and
From equation (i) and (ii)
physics-
Lux is equal to
Lux is equal to
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
