Two bars A and B of circular cross-section and same volume made of same material are subjected under same tension. If the diameter of A is half that of B. The ratio of extension of A to B will be
16
2
4
Water rises in a capillary upto a extension height such that upward force of surface tension balances the force of 75 x 10-4 N due to weight of water. If surface tension of water is 6x10-2 N/m.The internal circumference of the capillary must be
12.5m
6.5m
0.50m
1.25m
A capillary tube of radius r can support a liquid of weight 6.28 x 10-4 N. If the surface tension of the liquid is 5 x 10-2N/m. The radius of capillary must be
m
1.5
The soap bubbles have radii in the ratio 2: 1 ratio of excess pressure in side there is
1:4
4:1
2:1
1:2
Standing wave are produced in a 10 m long stretched string. If the string vibrates in 5 segments and the wave velocity is 20 m/s. The frequency is
10Hz
5Hz
4Hz
2Hz
A steel wire 0.5 m long has a total mass 0.01 kg and stretched with a tension of 800 N. The frequency with which it vibrates in its fundamental note will be
4Hz
2Hz
200Hz
160Hz
C.
200Hz
A cord attached to a vibrating tuning fork is divided into six segments under tension of 36 N. It will be divided into four segments, if the tension is
48N
81N
24N
16N
The equation of travelling wave is y= 60 cos (1800 t-6x) where y is in micron and t in second and x in metre. The ratio of maximum particle velocity to velocity of wave propagation is
3.6
3.6
In a sinusoidal wave, the time required for a particular point to move from maximum displacement to zero displacement is 0.170.The frequency of the wave will be
2.94Hz
0.73Hz
0.36Hz
1.47Hz
The root mean square velocity of hydrogen molecules of an ideal hydrogen gas kept in a gas chamber at 0C is 3180 m/s. Calculate the pressure of hydrogen gas:
3.0atm
2.0atm
1.5atm
1.0atm