Two spheres of same size are made of the same material but one is hollow and the other is solid. They are heated to the same temperature. The:

(A) both the spheres will expand equally
(B) the hollow sphere will expand more than the solid one
(C) the solid sphere will expand more than the hollow one
(D) no conclusion can be drawn about their relative expansions unless the nature of the
material is known

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  • The core of transformer is laminated so that:

    (A) The core of transformer is laminated so that:
    A) The ratio of the voltage in the secondary to that in the primary may be increased
    (B) Energy losses due to eddy currents may be minimized
    (C) The weight of the transformer may be reduced
    (D) Rusting of the core may be prevented

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