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
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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
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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
and 
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
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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
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.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
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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.physics-
Which of the curves in figure represents the relation between Celsius and Fahrenheit temperatures
Hence graph between 
and 
will be a straight line with positive slope and negative interceptWhich of the curves in figure represents the relation between Celsius and Fahrenheit temperatures
physics-General
Hence graph between and will be a straight line with positive slope and negative interceptmaths-
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
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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
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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
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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)
.
..... (i)and
..... (ii)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
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..... (i)
and..... (ii)
From equation (i) and (ii)
.
..... (i)and
..... (ii)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
and 
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
and