Institution: Directorate of Nursing Services (DNS) Exam: ডিপ্লোমা ইন নার্সিং ভর্তি পরীক্ষা। ২০২২-২০২৩ || নার্সিং(Nursing) ভর্তি পরীক্ষা || 2023
Topic: Physics (পদার্থবিদ্যা), Subject: General Science (সাধারণ বিজ্ঞান)

Best Answer Explained in Below-:

To understand the weight of an object, we need to apply the formula for weight (W), which is calculated using the equation W = m × g, where *m* is the mass in kilograms and *g* is the acceleration due to gravity.

On Earth, the standard value of *g* is approximately 9.8 m/s². For an object with a mass of 20 kg, we can compute its weight as follows:

\[
W = 20 \, \text{kg} \times 9.8 \, \text{m/s}²
\]

Performing the multiplication gives:

\[
W = 196 \, \text{N}
\]

Given that the options provided likely indicate a simplified approximation where *g* is considered to be roughly 10 m/s² instead (which is sometimes used for quick estimates), if we apply this simplified value:

\[
W = 20 \, \text{kg} \times 10 \, \text{m/s}² = 200 \, \text{N}
\]

However, for this particular question, it seems there has been a misunderstanding. The correct weight is indeed 196 N (which aligns with the 9.8 m/s² value), though if indeed you were looking for option ‘D’ being specified in the context possibly being rounded differently or transcription issues.

In any case, the answer cannot be 19 N; based on the standard acceleration due to gravity, the weight of a 20 kg mass is consistently around 196 N.