Question Text
Question 1 :
Equal volumes of water and alcohol are mixed together. The density of water is {tex}1000 \mathrm { kg } / \mathrm { m } ^ { 3 } {/tex} and the density of alcohol is {tex} 800 \mathrm { kg } / \mathrm { m } ^ { 3 } . {/tex} The density of the mixture is
Question 2 :
There is a hole in the bottom of tank having water. If total pressure at bottom is {tex}3\ atm{/tex} {tex} ( 1 \ atm = 10^{5} N / m ) {/tex} then the velocity of water flowing from hole is
Question 3 :
Air is streaming past a horizontal air plane wing such that its speed in {tex}120 \ m/s {/tex} over the upper surface and {tex}90 \ m/s {/tex} at the lower surface. If the density of air is {tex}1.3\ kg {/tex} per metre and the wing is {tex}10\ m {/tex} long and has an average width of {tex}2\ m {/tex} , then the difference of the pressure on the two sides of the wing of
Question 4 :
Two solids A and B float in water. It is observed that A floats with half its volume immersed and B floats with 2/3 of its volume immersed. Compare the densities of A and B
Question 5 :
An incompressible fluid thows steadily through a cylindrical pipe which has radius {tex} 2 r {/tex} at point {tex} A {/tex} and radius {tex} r {/tex} at {tex} B {/tex} further along the flow direction. If the velocity at point {tex} A {/tex} is {tex} v {/tex}, its velocity at point {tex} B {/tex} is
Question 6 :
A man is sitting in a boat which is floating in a pond. If the man drinks some water from the pond, the level of water in the pond
Question 7 :
The volume of brick is 2.197 litres. The submerged brick is balanced by a 2.54 kg mass on the beam scale. The weight of the brick is -
Question 8 :
A body of mass 0.5{tex} \mathrm { kg } {/tex} is attached to a thread and it just floats in a liquid. The tension in the thread is
Question 9 :
{tex}\mathrm{Assertion}{/tex} : Cars and aeroplanes are streamlined.<br>{tex} \mathrm { Reason } {/tex} : This is done to reduce the backward drag due to atmosphere.<br>
Question 10 :
Air streams horizontally past a small airplane's wings with a speed 70 ms<sup>-1</sup> over the top surface and 60 ms<sup>-1</sup> past the bottom surface. Plane has mass 1340 kg and wing area 16.2 m<sup>2</sup>. Find the net vertical force. Give density of air 1.2 kg m<sup>-3</sup>.
