1 . →F

• A. ${\underset{\nabla }{\to }}_{.}{\underset{F }{\to }}_{=0}$
• B. ${\underset{\nabla }{\to }}_{\times }{\underset{F }{\to }}_{=0}$
• C. ${\underset{\nabla }{\to }}_{.}{\underset{F }{\to }}_{\ne 0}$
• D. ${\underset{\nabla }{\to }}_{\times }{\underset{F }{\to }}_{\ne 0}$

Answer: Option B

Explanation:

2 . →F6i^-3j^+3k^

• A. $12 J$
• B. $5 J$
• C. $20 J$
• D. $21 J$

Answer: Option D

Explanation:

3 . →F=-2i^+3j^+3k^

• A. $52 j$
• B. $59 j$
• C. $54 j$
• D. $48 j$

Answer: Option A

Explanation:

4 . →F=m→a

• A. $\underset{V}{\to }$ধ্রুবক (constant)
• B. $\underset{V}{\to }=0$
• C. $\underset{V}{\to }$পরিবর্তনশীল (variable)
• D. কোনটিই নয়

Answer: Option A

Explanation: