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Match list–I with List–II
List–I    List–II
a Thermistor    e High +ve ' $α$ '
b Carbon f $α$ almost zero
c Nichrome    g either positive or negative ' $α$ '
d Constantan, and manganin    h Negative ' $α$ '

List–I	List–II
a	Thermistor	e	High +ve ' $α$ '
b	Carbon	f	$α$ almost zero
c	Nichrome	g	either positive or negative ' $α$ '
d	Constantan, and manganin	h	Negative ' $α$ '

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a-e, b-g, c-h, d-f

a-g, b-h, c-e, d-f

a-e, b-f, c-g, d-h

a-h, b-g, c-e, d-f

answer is A.

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Detailed Solution

The thermistor can have positive as well as negative values of $α$ .

Carbon → $α = - 0.0005 \Rightarrow α < 0 .$

Manganin → $α = 0.00001 \approx 0$

Nichrome → $α = 0.0004 . \Rightarrow α > 0$

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Match list–I with List–IIList–I List–IIaThermistor eHigh +ve 'α 'b Carbon f α almost zerocNichrome g either positive or negative 'α 'dConstantan, and manganin hNegative 'α '