• A. $N==N_{0^{e^{-t}}}$
• B. $N=N_{0^{e^{-\lambda t|t}}}$
• C. $N=N_{0^{e^{-\lambda t}}}$
• D. $N=N_{0^{e^{-t|t}}}$

Answer: Option B

Explanation:

• A. $1V{A}^{-1}{S}^{-1}$
• B. $1A{S}^{-1}{V}^{-1}$
• C. $1AS{V}^{-1}$
• D. $1VS{A}^{-1}$

Answer: Option D

Explanation:

• A. 550 J
• B. 746 J
• C. $3.6 \times {10}^{6 }$ J
• D. 9.8 J

Answer: Option C

Explanation:

• A. $\frac{\mathrm{\pi }}{1800}m/s$
• B. $\frac{\mathrm{\pi }}{1800}rad/s$
• C. $\frac{\mathrm{\pi }}{600}rad/s$
• D. $\frac{\mathrm{\pi }}{1200}rad/s$

Answer: Option B

Explanation:

• A. $L=\frac{g}{{\pi }^2}$
• B. $L=\frac{g^2}{{\pi }^2}$
• C. $L=\frac{{\pi }^2}{g}$
• D. $L={\pi }^2 g$

Answer: Option A

Explanation:

• A. তারকার ভর = $1.4M_{\circ }$
• B. তারকার ভর= $1.4M$
• C. তারকার ভর = $<1.4M_{\circ }$
• D. A ও B উভয়ই

Answer: Option C

Explanation:

• A. $n\lambda$
• B. $\frac{\mathrm{\pi }\lambda }{2}$
• C. $(2n + 1)\frac{\lambda }{2}$
• D. $(2 + 1)\frac{\lambda }{2}$

Answer: Option C

Explanation:

• A. $2.2N$
• B. $8.85 \times {10}^{12 }N$
• C. $1.6\times {10}^{19}N$
• D. $9\times {10}^9 N$

Answer: Option D

Explanation:

• A. $2$
• B. $\frac{1}{2}$
• C. $\frac{1}{3}$
• D. $1$

Answer: Option C

Explanation:

• A. $20 m{s}^{-1}$
• B. $10 m{s}^{-1}$
• C. $2 m{s}^{-1}$
• D. $1 m{s}^{-1}$

Answer: Option A

Explanation:

• 
• A. $2 \Omega$
• B. $4 \Omega$
• C. $6 \Omega$
• D. $8 \Omega$

Answer: Option B

Explanation:

• A. $7.8 m{s}^{-2}$
• B. $1 m{s}^{-2}$
• C. $2 m{s}^{-2}$
• D. $9.8 m{s}^{-2}$

Answer: Option C

Explanation:

• A. $0.19$
• B. $1.9 \times {10}^{-4}$
• C. $0.38$
• D. $3.8 \times {10}^{-4}$

Answer: Option B

Explanation:

• A. $M^2{L}^2{T}^2$
• B. $\left[M^{-1}{L}^{-3}{T}^{-2}\right]$
• C. $L{M}^{-1}{T}^{-2}$
• D. $L{M}^{-1}{T}^{-1}$

Answer: Option B

Explanation:

• A. $400 Vc{m}^{-1}$
• B. $400 V{m}^{-1}$
• C. $40 V c{m}^{-1}$
• D. $40 V{m}^{-1}$

Answer: Option B

Explanation: