A tuning fork of frequency 580 Hz is employed to produce transverse waves on a long rope. The distance between the nearest crusts is found to be 20 cm. The velocity of the wave is
58 ms-1
580 ms-1
116 ms-1
29 ms-1
A heavy brass sphere is hung from a weightless inelastic spring and as a simple pendulum its time period of oscillation is T. When the sphere is immersed in a non-viscous liquid of density 1/10 that of brass, it will act as a simple pendulum of period
T
The distance travelled by a sound wave when a tuning fork completes 25 vib in 16.5 m. If the frequency of the tuning fork is 500 Hz, find the velocity of sound.
350 ms-1
330 ms-1
300 ms-1
450 ms-1
Two instruments having stretched strings are being played in unison. When the tension of one of the instruments is increased by 1 %, 3 beats are produced in 2s. The initial frequency of vibration of each wire is
300 Hz
500 Hz
1000 Hz
400 Hz
The capacitors A and B have identical geometry. A material with a dielectric constant 3 is present between the plates of B. The potential difference across A and B are respectively
2.5 V, 7.5 V
2 V, 8 V
8 V, 2 V
7.5 V, 2.5 V
An electric bulb is marked 100 W, 230 V. If the supply voltage drops to 115 V, what is the total energy produced by the bulb in 10 min ?
30 kJ
20 kJ
15 kJ
10 kJ
A circular coil carrying a current has a radius R. The ratio of magnetic induction at the centre of the coil and at a distance equal to from the centre of the coil on the axis is
1 : 1
1 : 2
8 : 1
1 : 8
The examples of diamagnetic, paramagnetic and ferromagnetic materials are respectively
copper, aluminium, iron
aluminium, copper, iron
copper, iron, aluminium
aluminium, iron, copper
In the Wheatstone's bridge shown below, in order to balance the bridge we must have
R1 = 3 Ω, R2 = 3 Ω
R1 = 6 Ω, R2 = 1.5 Ω
R1 = 1.5 Ω, R2 = any finite value
R1 = 3 Ω, R2 = any finite value
D.
R1 = 3 Ω, R2 = any finite value
and resistance R2 may have finite value.
Four 10 F capacitors are connected to a 500 V supply as shown in the figure. The equivalent capacitance of the network is
40 μF
20 μF
13.3 μF
10 μF