Dynamo core is laminated because
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(a) Magnetic field increases |
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(b) Magnetic saturation level in core increases |
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(c) Residual magnetism in core decreases |
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(d) Loss of energy in core due to eddy currents decreases |
(d) Loss of energy in core due to eddy currents decreases
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All of the following statements are correct except
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(a) The magnification produced by a convex mirror is always less than one |
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(b) A virtual, erect, same-sized image can be obtained using a plane mirror |
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(c) A virtual, erect, magnified image can be formed using a concave mirror |
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(d) A real, inverted, same-sized image can be formed using a convex mirror |
The human eye has a lens which has a
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(a) Soft portion at its centre |
(b) Hard surface |
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(c) Varying refractive index |
(d) Constant refractive index |
Current provided by a battery is maximum when
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(a) Internal resistance equal to external resistance |
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(b) Internal resistance is greater than external resistance |
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(c) Internal resistance is less than external resistance |
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(d) None of these |
Two rays A and B being reflected by a mirror and going as A' and B'. The mirror:
Yellow light is used in single slit diffraction experiment with slit width 0.6 mm. If yellow light is replaced by X-rays then the pattern will reveal
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(a) That the central maxima is narrower |
(b) No diffraction pattern |
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(c) More number of fringes |
(d) Less number of fringes |