Electricity test for Elementary Competetion

A positive charge is revolving around a fixed line charge .If the radius of orbit is changed from "R" to "2R" then which of the following is correct ?
Work done by all forces cannot be zero.
Work done only by electric field is zero.
Net work done on system must be zero.
Only work done by external agent is zero.
if a body starts from rest from infinity what will be its speed when it reaches to the surface of the earth?
2.4m/s
11.1m/s
2.4m/s
11.2m/s
why the shutle gets exploded?
a.due to the compact arrangement in tile
b.due to atom dissociation
c.both a and b
current has direction.it is a scalar quantity?
true
false
none
what is the min. time taken by the electric field created by a charge q1 to interact with another charge q2 at some distance 'l 'apart?
l/c
0
l*c
(l*k)/c........... k is the dielectric constant of the medium
on what principle does MAGLEVS work on
super conductors
magnets
induced elctomagnetic fields
all the above
WHAT IS A FLUX CAPACITOR?
MULTI PURPOSE CAPACITOR
SINGLE PURPOSE CAPACITOR
A FUTURISTIC CAPACITOR
A CYLINDRICAL CAPACITOR
How is Neutrino distinguished from it's antiparticle -- Antineutrino?
By Charge
By Mass
By Spin
By energy
What is light?
light is apower that produces sensation of sight.
light is a power by which we can see object clearly.
why we use word " dielectric constant" in electrostatics.? what is the physical significance of dielectric constant
dont know
i know ...................contact me
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There are only 10 questions and expected time is 10 Min's.

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sivagangadharappa

It is very useful if it is explained some more better.

4308 days 22 hours 1 minutes ago

Kalyan Sarkar
Psychological interventions in Mathematics Study
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