A lamp takes 5A at 250 V and emits 4000 lumens. Its MSCP is:

Correct option is C

​$$\text{The Mean Spherical Candle Power (MSCP) is related to the luminous flux (in lumens) by:} \\[8pt]\Phi = 4\pi \times \text{MSCP} \\[10pt]\text{where} \\[6pt]\bullet \ \Phi = \text{luminous flux (lumens)} \\[14pt]\textbf{Given:} \\[6pt]\bullet \ \text{Luminous flux } \Phi = 4000 \text{ lumens} \\[16pt]\textbf{Calculation:} \\[8pt]\text{MSCP} = \frac{\Phi}{4\pi} = \frac{4000}{4\pi} = \frac{1000}{\pi}$$​​