MCQ
Which magnetic materials have negative susceptibility?
- ADiamagnetic materials.
- BParamagnetic materials.
- CFerromagnetic materials.
- DAll the above.
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Water of volume 2 litre in a container is heated with a coil of 1 kW at 27 oC. The lid of the container is open and energy dissipates at rate of 160 J/s. In how much time temperature will rise from 27oC to 77oC [Given specific heat of water is 4.2 kJ/kg]
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(a) 8 min 20 s |
(b) 6 min 2 s |
(c) 7 min |
(d) 14 min |


A 100 watt bulb working on 200 volt and a 200 watt bulb working on 100 volt have
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(a) Resistances in the ratio of 4 : 1 |
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(b) Maximum current ratings in the ratio of 1 : 4 |
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(c) Resistances in the ratio of 2 : 1 |
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(d) Maximum current ratings in the ratio of 1 : 2 |