A ‘Tsunami” that is huge tidal wave is created at O
of the ocean and travelled towards shore as shown.
It was found that the amplitude of wave A is
inversely proportional to
(a) 2.6m (b) 6.5m (c) 1.5m (d) 11.3m
In the circuit shown, the current through 8 ohm is
same before and after connecting E. The value of E
is
(a) 6 V (b) 2 V (c) 4 V (d) 8 V
An inductor L, a resistance R and two identical
bulbs,
h1/ 4, h is height of water
surface from bed. If the wave amplitude at the open
sea having depth 4.3km is 0.5cm, then the amplitude
at coastal shallows having depth 10m is 0.2x meter.
The value of x is.....
B 1 and B 2 are connected to a battery
through a switch S as shown in the figure. Which
of the following statements gives the correct
description of the happenings when the switch S
is closed.
(a) B 1 and B 2 light up together with equal
brightness all the time.
(b) The bulb B 2 lights up earlier than B 1 and
finally both the bulbs shine equally bright.
(c) B 1 light up earlier and finally both the bulbs
acquire equal brightness.
(d) B 2 lights up earlier and finally B 1 shines
brighter than 2
A transformer with efficiency 80% works at 4 kW
and 100V. If the secondary voltage is 200V. Then,
the primary and secondary currents are
respectively
(a) 40 A, 16 A (b) 20 A, 40 A
(c) 16 A, 40 A (d) 40 A, 10 A
A spherical conducting shell is connected to earth
with the help of a switch S. Initially the switch is
open and a point charge
4.
5.
B.
q 0 is present at a distance
x from the centre of the sphere. Now the charge
starts moving with speed v and the switch is closed
simultaneously. Find the current passing through
the switch.
