Physics-
General
Easy
Question
A person of mass M is stationary w.r.t. a weighing scale at the top of the wedge as shown in the fig. The wedge is on a frictionless inclined plane which makes an angle 
with the horizontal. The reading in the weighing scale is
- Mg cos
- Mg
- insufficient info
The correct answer is: insufficient info
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An object 'O' is kept in air in front of a thin plano convex lens of radius of curvature 10 cm. It's refractive index is 3/2 and the medium towards right of plane surface is water of refractive index 4/3. What should be the distance 'x' of the object so that the rays become parallel finally.
An object 'O' is kept in air in front of a thin plano convex lens of radius of curvature 10 cm. It's refractive index is 3/2 and the medium towards right of plane surface is water of refractive index 4/3. What should be the distance 'x' of the object so that the rays become parallel finally.
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In the figure shown, if 
is equal to
In the figure shown, if is equal to
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An equiconcave diverging lens of focal length F is cut into two equal halves. The two halves are turned around and joined with some liquid between them. The lens obtained is converging with focal length F. If the refractive index of the liquid is 3 then what is the refractive index of the lens?
An equiconcave diverging lens of focal length F is cut into two equal halves. The two halves are turned around and joined with some liquid between them. The lens obtained is converging with focal length F. If the refractive index of the liquid is 3 then what is the refractive index of the lens?
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A concave mirror of focal length 2 cm is placed on a glass slab as shown in the figure. Then the image of object O formed due to reflection at mirror and then refraction by the slab :
A concave mirror of focal length 2 cm is placed on a glass slab as shown in the figure. Then the image of object O formed due to reflection at mirror and then refraction by the slab :
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In the figure shown a point object O is placed in air. A spherical boundary separates various media of radius of curvature 1.0 m. AB is principal axis. The refractive index above AB is 1.6 and below AB is 2.0. The separation between the images formed due to refraction at spherical surface is:
In the figure shown a point object O is placed in air. A spherical boundary separates various media of radius of curvature 1.0 m. AB is principal axis. The refractive index above AB is 1.6 and below AB is 2.0. The separation between the images formed due to refraction at spherical surface is:
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A wooden block with mass 2.0 kg is moving up an inclined surface (a = 30°). At point S it has a speed of 8 m/sec; the block comes to a halt at point P (see the figure which is a vertical cross-section). The friction coefficient m between the block and the inclined surface is 0.25 (assume that g = 10 m/sec2 and that the kinetic and the static friction coefficients are the same)
A wooden block with mass 2.0 kg is moving up an inclined surface (a = 30°). At point S it has a speed of 8 m/sec; the block comes to a halt at point P (see the figure which is a vertical cross-section). The friction coefficient m between the block and the inclined surface is 0.25 (assume that g = 10 m/sec2 and that the kinetic and the static friction coefficients are the same)
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The reflecting surface is represented by the equation 
as shown in figure. A ray travelling horizontal becomes vertical after reflection. The co-ordinates of the point of incidence can be
The reflecting surface is represented by the equation as shown in figure. A ray travelling horizontal becomes vertical after reflection. The co-ordinates of the point of incidence can be
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The rectangular box is the place of a spherical mirror. The point S is the position of an object and the point I is the position of its image. The height of the point S from the axis is two times that of point I. The horizontal separation between S and I is equal to 15 cm.
The rectangular box is the place of a spherical mirror. The point S is the position of an object and the point I is the position of its image. The height of the point S from the axis is two times that of point I. The horizontal separation between S and I is equal to 15 cm.
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If the unit of length be doubled then the numerical value of the universal gravitation constant G will become (with respect to present value)
If the unit of length be doubled then the numerical value of the universal gravitation constant G will become (with respect to present value)
physics-General
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A point-like object of mass 2.0 kg moves along the x-axis with a velocity of + 4.0 m/s. A net horizontal force acting along the x-axis is applied to the object with the force-time profile shown. What is the total work that was done by the force?
A point-like object of mass 2.0 kg moves along the x-axis with a velocity of + 4.0 m/s. A net horizontal force acting along the x-axis is applied to the object with the force-time profile shown. What is the total work that was done by the force?
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Consider the cyclic process ABCA shown in figure, performed on a sample of 1 mole of an ideal gas. A total of 1000 J of heat is withdrawn from the sample in the process, the work done on the gas during part BC is 1830 J, the value of 
Consider the cyclic process ABCA shown in figure, performed on a sample of 1 mole of an ideal gas. A total of 1000 J of heat is withdrawn from the sample in the process, the work done on the gas during part BC is 1830 J, the value of
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A rubber ball bounces on the ground as shown. After each bounce, the ball reaches one-half the highest of the bounce before it. If the time the ball was in the air between the first and second bounce was 1 second, what would be the time between the second and third bounce?
A rubber ball bounces on the ground as shown. After each bounce, the ball reaches one-half the highest of the bounce before it. If the time the ball was in the air between the first and second bounce was 1 second, what would be the time between the second and third bounce?
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The diagram shows a uniformly charged hemisphere of radius R. It has volume charge density r. If the electric field at a point 2R distance above its center is E then what is the electric field at the point which is 2R below its center?
The diagram shows a uniformly charged hemisphere of radius R. It has volume charge density r. If the electric field at a point 2R distance above its center is E then what is the electric field at the point which is 2R below its center?
physics-General
physics-
The field line to the right is a field line of the electric field, then its representation can be
The field line to the right is a field line of the electric field, then its representation can be
physics-General
physics-
In frame I, two identical conducting spheres, A and B, carry equal amounts of excess charge that have the same sign. The spheres are separated by a distance d; and sphere A exerts an electrostatic force on sphere B which has a magnitude F. A third sphere, C, which is handled only by an insulated rod, is introduced in frame II. Sphere C is identical to A and B except that it is initially uncharged. Sphere C is touched first to sphere A, in frame II, and then to sphere B, in frame III, and is finally removed in frame IV.
Determine the magnitude of the electrostatic force that sphere A exerts on sphere B in frame IV
In frame I, two identical conducting spheres, A and B, carry equal amounts of excess charge that have the same sign. The spheres are separated by a distance d; and sphere A exerts an electrostatic force on sphere B which has a magnitude F. A third sphere, C, which is handled only by an insulated rod, is introduced in frame II. Sphere C is identical to A and B except that it is initially uncharged. Sphere C is touched first to sphere A, in frame II, and then to sphere B, in frame III, and is finally removed in frame IV.
Determine the magnitude of the electrostatic force that sphere A exerts on sphere B in frame IV
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