Physics-
General
Easy
Question
Initial velocity of the block 
while external force on it is 
. It coefficient of static and kinetic friction are .3 and .2 respectively then distance traveled by the block in 12 sec. (g = 10 m/s2) is:
- 225 m
- 216 m
- 210 m
- 250 m
The correct answer is: 225 m
Net retardation 
If body stop at time t, then
When block stops, Fext will try to bring the block back ward while frictional force will oppose its motion, since block is stationary therefore at this moment, frictional force will be static. Whose maximum value will be 
. Since static frictional force is self adjusting therefore it will be 25 N and block will not move after t = 10 sec.
Related Questions to study
Physics-
In the system shown, the acceleration of the wedge of mass 5M is (there is no friction anywhere)
In the system shown, the acceleration of the wedge of mass 5M is (there is no friction anywhere)
Physics-General
Physics-
A particle starts at ‘A’ with initial speed 
. It moves along a circular path under the action of a variable
force which is always directed towards ‘B”. A and B are end points of a diameter. When it reaches the point ‘P’ as shown , the speed is (Neglect the effect of gravity).
A particle starts at ‘A’ with initial speed . It moves along a circular path under the action of a variable
force which is always directed towards ‘B”. A and B are end points of a diameter. When it reaches the point ‘P’ as shown , the speed is (Neglect the effect of gravity).
Physics-General
Physics-
A bead of mass m is fitted on a rod and can move on it without friction. Initially the bead is at the middle of the rod and the rod moves translationally in a vertical plane with an acceleration 
in a direction forming an angle 
with the horizontal plane. The acceleration of bead with respect to rod is
A bead of mass m is fitted on a rod and can move on it without friction. Initially the bead is at the middle of the rod and the rod moves translationally in a vertical plane with an acceleration in a direction forming an angle with the horizontal plane. The acceleration of bead with respect to rod is
Physics-General
Physics-
A lens when placed on a plane mirror then object needle and its image coincide at 15 cm. The focal length of the lens is
A lens when placed on a plane mirror then object needle and its image coincide at 15 cm. The focal length of the lens is
Physics-General
Physics-
A thin rod of 
length is kept along the axis of a concave mirror of 
focal length such that its image is real and magnified and one end touches the rod. Its magnification will be
A thin rod of length is kept along the axis of a concave mirror of focal length such that its image is real and magnified and one end touches the rod. Its magnification will be
Physics-General
Physics-
A ray of light makes an angle of 10o with the horizontal above it and strikes a plane mirror which is inclined at an angle 
to the horizontal. The angle q for which the reflected ray becomes vertical is
A ray of light makes an angle of 10o with the horizontal above it and strikes a plane mirror which is inclined at an angle to the horizontal. The angle q for which the reflected ray becomes vertical is
Physics-General
Physics-
PQR is a right angled prism with other angles as 60o and 30o. Refractive index of prism is 1.5. PQ has a thin layer of liquid. Light falls normally on the face PR. For total internal reflection, maximum refractive index of liquid is
PQR is a right angled prism with other angles as 60o and 30o. Refractive index of prism is 1.5. PQ has a thin layer of liquid. Light falls normally on the face PR. For total internal reflection, maximum refractive index of liquid is
Physics-General
Physics-
A convergent beam of light is incident on a convex mirror so as to converge to a distance 12 cm from the pole of the mirror. An inverted image of the same size is formed coincident with the virtual object. What is the focal length of the mirror
A convergent beam of light is incident on a convex mirror so as to converge to a distance 12 cm from the pole of the mirror. An inverted image of the same size is formed coincident with the virtual object. What is the focal length of the mirror
Physics-General
Physics-
A point source of light S is placed at the bottom of a vessel containing a liquid of refractive index 5/3. A person is viewing the source from above the surface. There is an opaque disc D of radius 1 cm floating on the surface of the liquid. The centre of the disc lies vertically above the source S. The liquid from the vessel is gradually drained out through a tap. The maximum height of the liquid for which the source cannot be seen at all from above is
A point source of light S is placed at the bottom of a vessel containing a liquid of refractive index 5/3. A person is viewing the source from above the surface. There is an opaque disc D of radius 1 cm floating on the surface of the liquid. The centre of the disc lies vertically above the source S. The liquid from the vessel is gradually drained out through a tap. The maximum height of the liquid for which the source cannot be seen at all from above is
Physics-General
Physics-
A slab of glass, of thickness 6 cm and refractive index 1.5, is placed in front of a concave mirror, the faces of the slab being perpendicular to the principal axis of the mirror. If the radius of curvature of the mirror is 40 cm and the reflected image coincides with the object, then the distance of the object from the mirror is
A slab of glass, of thickness 6 cm and refractive index 1.5, is placed in front of a concave mirror, the faces of the slab being perpendicular to the principal axis of the mirror. If the radius of curvature of the mirror is 40 cm and the reflected image coincides with the object, then the distance of the object from the mirror is
Physics-General
Physics-
A ray of light strikes a plane mirror M at an angle of 45° as shown in the figure. After reflection, the ray passes through a prism of refractive index 1.5 whose apex angle is 4°. The total angle through which the ray is deviated is
A ray of light strikes a plane mirror M at an angle of 45° as shown in the figure. After reflection, the ray passes through a prism of refractive index 1.5 whose apex angle is 4°. The total angle through which the ray is deviated is
Physics-General
Physics-
When the rectangular metal tank is filled to the top with an unknown liquid, as observer with eyes level with the top of the tank can just see the corner E; a ray that refracts towards the observer at the top surface of the liquid is shown. The refractive index of the liquid will be
When the rectangular metal tank is filled to the top with an unknown liquid, as observer with eyes level with the top of the tank can just see the corner E; a ray that refracts towards the observer at the top surface of the liquid is shown. The refractive index of the liquid will be
Physics-General
Physics-
Following figure shows the multiple reflections of a light ray along a glass corridor where the walls are either parallel or perpendicular to one another. If the angle of incidence at point P is 30°, what are the angles of reflection of the light ray at points Q, R, S and T respectively
Following figure shows the multiple reflections of a light ray along a glass corridor where the walls are either parallel or perpendicular to one another. If the angle of incidence at point P is 30°, what are the angles of reflection of the light ray at points Q, R, S and T respectively
Physics-General
Physics-
A small fish 0.4 m below the surface of a lake, is viewed through a simple converging lens of focal length 3 m. The lens is kept at 0.2 m above the water surface such that fish lies on the optical axis of the lens. The image of the fish seen by observer will be at 
A small fish 0.4 m below the surface of a lake, is viewed through a simple converging lens of focal length 3 m. The lens is kept at 0.2 m above the water surface such that fish lies on the optical axis of the lens. The image of the fish seen by observer will be at
Physics-General
Physics-
In a thin spherical fish bowl of radius 10 cm filled with water of refractive index 4/3 there is a small fish at a distance of 4 cm from the centre C as shown in figure. Where will the image of fish appears, if seen from E
In a thin spherical fish bowl of radius 10 cm filled with water of refractive index 4/3 there is a small fish at a distance of 4 cm from the centre C as shown in figure. Where will the image of fish appears, if seen from E
Physics-General
