Physics
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Intensity of central bright fringe due to interference of two identical coherent monochromatic sources is I. If one of the source is switched off, then intensity of central bright fringe becomes



 I
The correct answer is:
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If a tangent to ellipse + = 1 makes an angle with x axis, then square of length of intercept of tangent cut between axes is
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Vibrating tuning fork of frequency is placed near the open end of a long cylindrical tube. The tube has a side opening and is fitted with a movable reflecting piston. As the piston is moved through the intensity of sound changes from a maximum to minimum. If the speed of sound is then is
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PQ and QR are two focal chords of an ellipse and the eccentric angles of P,Q,R and
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PQ and QR are two focal chords of an ellipse and the eccentric angles of P,Q,R and
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The radius of the circle passing through the points of intersection of ellipse = 1 and x^{2 }– y^{2} = 0 is 
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If are the eccentric angles of the extremities of a focal chord of an ellipse, then the eccentricity of the ellipse is 
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If is the angle between the diameter through any point on a standard ellipse and the normal at the point, then the greatest value of tan is–
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A radar operates at wavelength 50.0 cm. If the beat freqency between the transmitted singal and the singal reflected from aircraft ( ) is 1 kHz, then velocity of the aircraft will be
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The locus of P such that PA^{2} + PB^{2} = 10 where A = (2, 0) and B = (4, 0) is
The locus of P such that PA^{2} + PB^{2} = 10 where A = (2, 0) and B = (4, 0) is
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Let L = 0 is a tangent to ellipse + = 1 and S, be its foci. If length of perpendicular from S on L = 0 is 2 then length of perpendicular from on L = 0 is
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The condition that the line x + my = n may be a normal to the ellipse + = 1 is
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Two blocks A and B of equal masses m kg each are connected by a light thread, which passes over a massless pulley as shown in the figure. Both the blocks lie on wedge of mass m kg. Assume friction to be absent everywhere and both the blocks to be always in contact with the wedge. The wedge lying over smooth horizontal surface is pulled towards right with constant acceleration a ( ). (g is acceleration due to gravity). Normal reaction (in N) acting on block A.
Two blocks A and B of equal masses m kg each are connected by a light thread, which passes over a massless pulley as shown in the figure. Both the blocks lie on wedge of mass m kg. Assume friction to be absent everywhere and both the blocks to be always in contact with the wedge. The wedge lying over smooth horizontal surface is pulled towards right with constant acceleration a ( ). (g is acceleration due to gravity). Normal reaction (in N) acting on block A.
PhysicsGeneral
physics
Two blocks A and B of equal masses m kg each are connected by a light thread, which passes over a massless pulley as shown in the figure. Both the blocks lie on wedge of mass m kg. Assume friction to be absent everywhere and both the blocks to be always in contact with the wedge. The wedge lying over smooth horizontal surface is pulled towards right with constant acceleration a ( ). (g is acceleration due to gravity) Normal reaction (in N) acting on block B is
Two blocks A and B of equal masses m kg each are connected by a light thread, which passes over a massless pulley as shown in the figure. Both the blocks lie on wedge of mass m kg. Assume friction to be absent everywhere and both the blocks to be always in contact with the wedge. The wedge lying over smooth horizontal surface is pulled towards right with constant acceleration a ( ). (g is acceleration due to gravity) Normal reaction (in N) acting on block B is
physicsGeneral
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A light inextensible string connects a block of mass m and top of wedge of mass M. The string is parallel to inclined surface and the inclined surface makes an angle with horizontal as shown in the figure. All surfaces are smooth. Now a constant horizontal force of minimum magnitude F is applied to wedge towards right such that the normal reaction on block exerted by wedge just becomes zero. The magnitude of acceleration of wedge is
A light inextensible string connects a block of mass m and top of wedge of mass M. The string is parallel to inclined surface and the inclined surface makes an angle with horizontal as shown in the figure. All surfaces are smooth. Now a constant horizontal force of minimum magnitude F is applied to wedge towards right such that the normal reaction on block exerted by wedge just becomes zero. The magnitude of acceleration of wedge is
physicsGeneral