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 
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 
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,
Change in angular momentum,
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

physics-General
Time of flight. 
Horizontal range,
Change in angular momentum,
about point of projection




Horizontal range,
Change in angular momentum,
physics-
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
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
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
physics-
A small particle of mass
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plane as shown in the figure.
the angular momentum of the particle is

A small particle of mass
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in the
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plane as shown in the figure.
the angular momentum of the particle is

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
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If the normal at the point
to the ellipse
intersects it again at the point
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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
