Physics-
A string of length 
is fixed at one end and the string makes 
rev/s around the vertical axis through, the fixed and as shown in the figure, then tension in the string is
Physics-General
- 4
- 16
Answer:The correct answer is: 16
(i)
(ii)
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physics-
A thin prism 
with angle 
and made from glass of refractive index 1.54 is combined with another thin prism 
of refractive index 1.72 to produce dispersion without deviation. The angle of prism will be
Þ A'
A thin prism with angle and made from glass of refractive index 1.54 is combined with another thin prism of refractive index 1.72 to produce dispersion without deviation. The angle of prism will be
physics-General
Þ A'
physics-
A triangular prism of glass is shown in the figure. A ray incident normally to one face is totally reflected, if 
. The index of refraction of glass is
For total internal reflection 
or
or
A triangular prism of glass is shown in the figure. A ray incident normally to one face is totally reflected, if . The index of refraction of glass is
physics-General
For total internal reflection
or
or
physics-
Which of the following diagrams, shows correctly the dispersion of white light by a prism
Because in dispersion of white light, the rays of different colours are not parallel to each other. Also deviation takes place in same direction.
Which of the following diagrams, shows correctly the dispersion of white light by a prism
physics-General
Because in dispersion of white light, the rays of different colours are not parallel to each other. Also deviation takes place in same direction.
physics-
A ray of light incident normally on an isosceles right angled prism travels as shown in the figure. The least value of the refractive index of the prism must be
A ray of light incident normally on an isosceles right angled prism travels as shown in the figure. The least value of the refractive index of the prism must be
physics-General
physics-
Three balls are dropped from the top of a building with equal speed at different angles. When the balls strike ground their velocities are 
and 
respectively, then
All the balls are projected from the same height, therefore their velocities will be equal.
Three balls are dropped from the top of a building with equal speed at different angles. When the balls strike ground their velocities are and respectively, then
physics-General
All the balls are projected from the same height, therefore their velocities will be equal.
physics-
A ray of monochromatic light is incident on one refracting face of a prism of angle 
. It passes through the prism and is incident on the other face at the critical angle. If the refractive index of the material of the prism is 
, the angle of incidence on the first face of the prism is
From figure
From Snell’s law At B
From Snell’s law At B
A ray of monochromatic light is incident on one refracting face of a prism of angle . It passes through the prism and is incident on the other face at the critical angle. If the refractive index of the material of the prism is , the angle of incidence on the first face of the prism is
physics-General
From figure
From Snell’s law At B
From Snell’s law At B
physics-
A light ray is incident upon a prism in minimum deviation position and suffers a deviation of 34°. If the shaded half of the prism is knocked off, the ray will
By formula 
and in the second position 
or 
and in the second position or A light ray is incident upon a prism in minimum deviation position and suffers a deviation of 34°. If the shaded half of the prism is knocked off, the ray will
physics-General
By formula and in the second position
or
and in the second position or physics-
A prism ABC of angle 30° has its face AC silvered. A ray of light incident at an angle of 45° at the face AB retraces its path after refraction at face AB and reflection at face AC. The refractive index of the material of the prism is
A prism ABC of angle 30° has its face AC silvered. A ray of light incident at an angle of 45° at the face AB retraces its path after refraction at face AB and reflection at face AC. The refractive index of the material of the prism is
physics-General
physics-
Average torque on a projectile of mass 
, initial speed 
and angles of projection 
, between initial and final position 
and 
as shown in figure about the point of projection is
Time of flight. 
Horizontal range,
Change in angular momentum,
about point of projection
Horizontal range,
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about point of projectionAverage torque on a projectile of mass , initial speed and angles of projection , between initial and final position and as shown in figure about the point of projection is
physics-General
Time of flight.
Horizontal range,
Change in angular momentum,
about point of projection
Horizontal range,
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about point of projectionphysics-
A ray of light passes through an equilateral glass prism in such a manner that the angle of incidence is equal to the angle of emergence and each of these angles is equal to 3/4 of the angle of the prism. The angle of deviation is
Is a band spectrum
In the position of minimum deviation
or 
In the position of minimum deviation
or A ray of light passes through an equilateral glass prism in such a manner that the angle of incidence is equal to the angle of emergence and each of these angles is equal to 3/4 of the angle of the prism. The angle of deviation is
physics-General
Is a band spectrum
In the position of minimum deviation
or
In the position of minimum deviation
or physics-
A small body of mass slides down from the top of a hemisphere of radius 
. The surface of block and hemisphere are frictionless. The height at which the body lose contact with the surface of the sphere is
A small body of mass slides down from the top of a hemisphere of radius . The surface of block and hemisphere are frictionless. The height at which the body lose contact with the surface of the sphere is
physics-General
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A small particle of mass 
is projected at an angle with the 
-axis with an initial velocity 
in the -
plane as shown in the figure. 
the angular momentum of the particle is
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physics-General
physics-
The figures represent three cases of a ray passing through a prism of angle A. The case corresponding to minimum deviation is
The figures represent three cases of a ray passing through a prism of angle A. The case corresponding to minimum deviation is
physics-General
maths-
If the normal at the point 
to the ellipse 
intersects it again at the point 
, then 
is
If the normal at the point to the ellipse intersects it again at the point , then is
maths-General
physics-
A fighter plane enters inside the enemy territory, at time 
with velocity 
and moves horizontally with constant acceleration 
(see figure). An enemy tank at the border, spot the plane and fire shots at an angle 
with the horizontal and with velocity 
. At what altitude 
of the plane it can be hit by the shot?
If it is being hit then
or
or
A fighter plane enters inside the enemy territory, at time with velocity and moves horizontally with constant acceleration (see figure). An enemy tank at the border, spot the plane and fire shots at an angle with the horizontal and with velocity . At what altitude of the plane it can be hit by the shot?
physics-General
If it is being hit then
or
or