Question

Which of the following combination is true about the mass of a body according to Newton?
I. Mass is the quantity of matter contained in a body
II. Mass is represented by the relation: mass $=\frac{force}{velocity}$
III. Mass is always conserved
IV. Mass of a body is the ratio of its weight to acceleration due to gravity at a particular place.

• A. I, II and IV only
• B. I, III and IV only
• C. I, II and III only
• D. I, II, III and IV

Answer 1

Answer: (B)

I, III and IV only

I. It states the definition of mass which is true.

II. According to Newton's second law of motion, $F=ma$

$\Rightarrow$ Mass $=\frac{force}{acceleration}$

So, the given statement is incorrect.

III. Mass is always conserved, i.e. law of conservation of mass.

IV. $W=mg\Rightarrow m=\frac{W}{g}$

So, the given statement is incorrect.

$\therefore$ Option B is correct.