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When a monochromatic point source of light is at a distance 0.2 m from a photoelectric cell the saturation current and cut off voltage are 12mA and 0.5v . If the same source is palced at 0.4 m away from the same photoelectric cell , then the saturation current , now will be ……………………….
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In a circuit for finding the resistance of a galvanometer by half deflection method , a 6v battery and a high resistance of 11 kῼ are used . The figure of merit of galvanometer is 60𝜇A/division . In the absence of shunt resistance the galvanometer produces a deflection of 𝜃=9 divisions when current flows in the circuit . The value of the shunt resistance that can cause the deflection of 𝜃/2 is closed to ………………..
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Two thin symmetrical lens of different nature have equal radii of curvature of all faces R=20 cm . The lenses are put close together and immersed in water . The focal length of system is 24cm . The difference between refractive indies of the two lenses is ………………………..x1/9 . Refractive index of wirer is 4/3
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The potential difference across 8 ohm resistance is 48v as shown in the figure . The value of potential difference across x and y points will be ……………… volts
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The variation of length of two metal rods A and B with change in temperature is shpown in figure . If the coefficients of linear expansion for the metal A is = n x 〖10〗^(−6) /℃ , then the value of ‘n’ will be in nearest interwar given 〖𝛼" " 〗_𝐵= 9 x〖10〗^(−6) /℃ )
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A uniform solid cylinder of mass M and radius R is placed on a rough horizontal board of same mass , which in turn is placed on a smooth surface . The coefficient of friction between the board and the cylinder is 𝜇=0.3 . If the board starts acceleration with constant acceleration a , as shown in the figure , then the maximum value of a , so that the cylinder performs pure rolling is ……………… m/𝑠^2 , g = 10 m/𝑠^2
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An arrow sign is made by cutting and re-joining a quarter part od square plate of side L=1m As shown . The distance OC , where “c” is the centre of mass of the arrow is ………cm
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In the system shown all the surfaces are frictionless while pulley and string are massless. Mass of block A is 3m and that of block B is m . If the acceleration of block B with respect to ground after system is released from rest is ‘a’ then the value of ‘10a’ is (take g= 10 , 5√2= 7.0 )
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