A transparent cube of 15 cm edge contains a small air bubble. Its apparent depth when viewed through one face is 6 cm and when viewed through the opposite face is 4 cm. Then the refractive index of the material of the cube is
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(a) 2.0 |
(b) 2.5 |
(c) 1.6 |
(d) 1.5 |
(d) 1.5
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A curve between magnetic moment and temperature of magnet is
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(a)
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(b)
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(c)
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(d)
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An electric dipole is put in north-south direction in a sphere filled with water. Which statement is correct
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(a) Electric flux is coming towards sphere |
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(b) Electric flux is coming out of sphere |
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(c) Electric flux entering into sphere and leaving the sphere are same |
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(d) Water does not permit electric flux to enter into sphere |
Two insulated metallic spheres of 3 μF and 5 μF capacitances are charged to 300 V and 500V respectively. The energy loss, when they are connected by a wire is
|
(a) 0.012 J |
(b) 0.0218 J |
(c) 0.0375 J |
(d) 3.75 J |
The distance between the body centred atom and a corner atom in sodium (a = 4.225 Å) is
|
(a) 3.66 Å |
(b) 3.17 Å |
(c) 2.99 Å |
(d) 2.54 Å |
A 50 volt potential difference is suddenly applied to a coil with 
henry and R = 180 ohm. The rate of increase of current after 0.001 second is
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(a) 27.3 amp/sec |
(b) 27.8 amp/sec |
(c) 2.73 amp/sec |
(d) None of the above |
Two capacitors connected in parallel having the capacities 
and 
are given ‘q’ charge, which is distributed among them. The ratio of the charge on and will be
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(a) |
(b) |
(c) |
(d) |
Two parallel wires of length 9 m each are separated by a distance 0.15 m. If they carry equal currents in the same direction and exerts a total force of 30 × 10–7 N on each other, then the value of current must be
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(a) 2.5 amp |
(b) 3.5 amp |
(c) 1.5 amp |
(d) 0.5 amp |
