निम्नलिखित में से किस पदार्थ का प्रतिरोध तापमान गुणांक (temperature coefficient) ऋणात्मक होता है?

Which of the following territories was annexed by Lord Dalhousie under the pretext of misgovernance, and not directly through the Doctrine of Lapse?

What was the primary stated reason for the Partition of Bengal in 1905 by Lord Curzon?