Question

13. Water flows through a non-uniform tube of area
of cross sections A, B and C whose values are
25, 15 and 35 cm² respectively. The ratio of
the velocities of water at the sections A, B and
C is
1) 5:3:7 2)7:3:5 3) 21:35:154)1:1:1​

Answer 1

The required option (3) 21 : 15 : 154 is correct.

Explanation:

Given,

Area  of cross sections A = 25 $cm^{2}$,

Area  of cross sections B = 15 $cm^{2}$ and

Area  of cross sections C = 35 $cm^{2}$,

To finfd $V_{A} : V_{B} : V_{C} :$ = ?

We know that,

AV = Constant

∴ $A_{1} V_{1} = A_{2} V_{2} = A_{3} V_{3}$ = k =Constant

⇒ 25 × V_{1} = 15 × V_{2} = 35 × $V_{3}$

∴ $V_{A} : V_{B} : V_{C} :$ = 21 : 15 : 154.

Hence, the required option (3 ) 21 : 15 : 154 is correct.