Question

Match the statements of Column A with those of Column B.

Column A	Column B
(A) Thrust	(p) Pascal
(B) Relative density	(q) Newton
(C) Pressure	(r) ${\mathrm{kgm}}^{-3}$
(D) Density	(s) no unit

• A. A --→ s; B--→ q; C--→p; D-→r
• B. A -→r; B-→ q; C-→p; D-→r
• C. A -→q; B-→r; C-→p; D-→s
• D. A-→q; B-→s; C-→p; D-→r

Answer 1

The correct option is D

A-→q; B-→s; C-→p; D-→r

1. Thrust is defined as force acting on an object perpendicular to its surface and its unit is Newton (N);(A)----→(P)
2. Relative density is defined as the ratio of density of a substance to the density of a reference substance ,since its ratio of two similar quantities it doesn't have unit
   $\mathrm{relative}\mathrm{density}=\frac{\mathrm{density}\mathrm{of}\mathrm{a}\mathrm{solid}/\mathrm{liquid}}{\mathrm{density}\mathrm{of}\mathrm{reference}\mathrm{substance}};\mathrm{reference}\mathrm{substance}\mathrm{may}\mathrm{be}\mathrm{water}$
   Thus (B)---→(s)
3. Pressure is defined as the force applied to an object perpendicular to its surface per unit area ;$\mathrm{pressure}=\frac{\mathrm{Force}}{\mathrm{Area}}\mathrm{and}\mathrm{its}\mathrm{SI}\mathrm{unit}\mathrm{is}\mathrm{Pascal}$
   Hence option (C)----→(p)
4. Density of an object is defined as mass of the substance per unit volume ;
   $\mathrm{Density}=\frac{\mathrm{mass}}{\mathrm{volume}}$and its unit is $\frac{\mathrm{kg}}{{\mathrm{m}}^3}$
   Hence option (D)--→(r)
   Thus option (d) is the correct answer: A-→q; B-→s; C-→p; D-→r