Which of the following has the least count of 0.001 cm? MCQ with Answer and Explanation

Explanation:
I = P/V = 60/120 = 0.5 A. Direct power formula application. Memory tip: 'I = P/V for resistive loads; always use consistent units'. Basic electricity numerical frequently tested in competitive exams to verify formula application and unit handling.

Explanation:
Gamma rays are EM waves, no mass/charge, highly penetrating, least ionising. Alpha has highest ionising power.

Explanation:
M = 1 + D/f when image at near point (D = 25 cm). For infinity, M = D/f. So max at near point.