A wooden block, with a coin placed on its top, floats in water as shown in the figure. The distances h and l are shown there. After sometime, the coin falls into the water. Then
both l and h increase
both l and h decrease
l decreases and h increases
l increases and h decreases
A square wire frame of size L is dipped in a liquid. On taking out a membrane is formed. If the surface tension of liquid is T, then force acting on a frame will be
2T L
4T L
8T L
16T L
A 20 cm long capillary tube is dipped in water. The water rises up to 8 cm. If entire arrangement is put in a freely falling elevator, the length of water column in the capillary tube will be
4 cm
8 cm
10 cm
20 cm
A metal plate of area 103 cm2 rests on a layer of oil 6 mm thick. A tangential force of 10-2 N is applied on it to move it with a constant velocity of 6 cms-1. The coefficient of viscosity of the liquid is
0.1 poise
0.5 poise
0.7 poise
0.9 poise
A.
0.1 poise
Sixty four spherical rain drops of equal size are falling vertically through air with a terminal velocity 1.5 ms-1 . If these drops coalesce to form a big spherical drop, then terminal velocity of big drop is
8 ms-1
16 ms-1
24 ms-1
32 ms-1
A cylinder of height 20 m is completely filled with water. The velocity of efflux of water (in ms-1 ) through a hole on the side wall of the cylinder near its bottom, is
10
20
25.5
5
A liquid flows through a pipe of non-uniform cross-section. If A1 and A2 are the cross-sectional areas of the pipe at two points, the ratio of velocities of the liquid at these points will be
A1A2
A particle executes simple harmonic motion between x = − A and x = + A. The time taken for it to go from O to A/ 2 is T1 and to go from A/2 to A is T2 . Then
T1 < T2
T1 > T2
T1 = T2
T1 = 2T2
A body executes simple harmonic motion. The potential energy (PE), kinetic energy (KE) and total energy (TE) are measured as a function of displacement y. Which of the following statements is true ?
TE is zero when x = 0
PE is maximum when x = 0
KE is maximum when x = O
KE is maximum when x is maximum
The equation of a wave is y = 5 sin where x is in cm and t in seconds. The maximum velocity of the wave will be
1 ms-1
2 ms-1
1.5 ms-1
1.25 ms-1