• A. ± 3 m
• B. -3m
• C. +3m
• D. 6m

Answer: Option A

Explanation:

• A. $a^2-b^2=\left(a+b\right)\left(a-b\right)$
• B. $a^2+b^2={\left(a+b\right)}^2 -2ab$
• C. $a^2+b^2={\left(a-b\right)}^2 +2ab$
• D. ${\left(a+b\right)}^2={\left(a-b\right)}^2 +4ab$

Answer: Option C

Explanation:

• A. 19
• B. 20
• C. 21
• D. 22

Answer: Option D

Explanation:

• A. 16a = 40b
• B. 40a = 16b
• C. ab = 40 ´ 16
• D. ab = 640

Answer: Option B

Explanation:

• A. V = 4 πrh
• B. $V={\mathrm{\pi r}}^2\mathrm{h}$
• C. V = 4 πrh
• D. $V=2{\mathrm{\pi r}}^2\mathrm{h}$

Answer: Option B

Explanation:

• A. 2
• B. -3
• C. 1
• D. -2

Answer: Option D

Explanation:

• A. -4
• B. -2
• D. 2

Answer: Option C

Explanation:

• A. ০.১
• B. ০.০০১
• C. ০.০০০১
• D. ১.০

Answer: Option B

Explanation:

• A. 20°
• B. 30°
• C. 60°
• D. 45°

Answer: Option A

Explanation:

• A. $\pi r$
• B. $\pi r^2$
• C. $\pi r^3$
• D. $2r$

Answer: Option B

Explanation:

• A. $(a + b)/(a-b)$
• B. $(a+b)\times (a-b)$
• C. $(a-b)/(a-b)$
• D. $ab$

Answer: Option B

Explanation:

• A. $\frac{৪০}{৯০}$
• B. $\frac{৪০}{১০}$
• C. $\frac{৪৭}{৯৯}$
• D. $\frac{৪৭}{১০০}$

Answer: Option D

Explanation:

• A. $\frac{\mathrm{১}}{\mathrm{২}}$
• B. $\frac{\mathrm{১}}{\mathrm{৪}}$
• C. $\frac{\mathrm{১}}{\mathrm{৩}}$
• D. $\frac{\mathrm{১}}{\mathrm{৫}}$

Answer: Option B

Explanation:

• A. 9
• B. 3
• C. 7

Answer: Option D

Explanation:

• A. ১২ দিনে
• B. ১০ দিনে
• C. $৪\frac{৩}{৪}$দিনে
• D. $১১\frac{১}{৪}$দিনে

Answer: Option D

Explanation: