HSC, Admission ও BCS এর সেরা প্রস্তুতি

প্রশ্ন ৮·সময় ২ ঘণ্টা ৩৫ মিনিট

1. The half-life of two elements is 3 hours and 7 hours.

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2. In an N-P-N transistor, 108 electrons cross the ammeter in $10^{-8} \mathrm{~s}$ .

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3. For $i_{\text {, }}$ current, the magnetic field at $\mathrm{K}$ is $8 \mathrm{NA}^{-1} \mathrm{~m}^{-1}$

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4. $Q_{1}=-4.5 \mathrm{nC}$ and $Q_{2}=+9.1 \mathrm{nC}$ . Distance between the charges is $40 \mathrm{~cm}$ .

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5. A ray of $2500 \AA$ wavelength is inflicted on a metal. The work function of the metal is $2.3 \mathrm{eV}$ .

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Physics 2nd Paper CQ-Barishal Board-2017