1
AIPMT 2015
+4
-1
The cylindrical tube of a spray pump has radius R, one end of which has n fine holes, each of radius r. If the speed of the liquid in the tube is V, the speed of the ejection of the liquid through the holes is
A
$${{VR{}^2} \over {{n^3}{r^2}}}$$
B
$${{{V^2}R} \over {nr}}$$
C
$${{V{R^2}} \over {{n^2}{r^2}}}$$
D
$${{V{R^2}} \over {n{r^2}}}$$
2
AIPMT 2015
+4
-1
The Young's modulus of steel is twice that of brass. Two wires of same length and of same area of cross section, one of steel and another of brass are suspended from the same roof. If we want the lower ends of the wires to be at the same level, then the weights added to the steel and brass wires must be in the ratio of
A
4 : 1
B
1 : 1
C
1 : 2
D
2 : 1
3
AIPMT 2015 Cancelled Paper
+4
-1
The two ends of a metal rod are maintained at temperatures 100oC and 110oC. The rate of heat flow in the rod is found to be 4.0 J/s. If the ends are maintained at temperatures 200oC and 210oC, the rate of heat flow will be
A
8.0 J/s
B
4.0 J/s
C
44.0 J/s
D
16.8 J/s
4
AIPMT 2015 Cancelled Paper
+4
-1
A wind with speed 40 m/s blows parallel to the roof of a house. The area of the roof is 250 m2. Assuming that the pressure inside the house is atmospheric pressure, the force exerted by the wind on the roof and the direction of the force will be $$({\rho _{air}} = 1.2kg/{m^3})$$
A
2.4 $$\times$$ 105 N, upwards
B
2.4 $$\times$$ 105 N, downwards
C
4.8 $$\times$$ 105 N, downwards
D
4.8 $$\times$$ 105 N, upwards
EXAM MAP
Medical
NEET