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- 1. Multiple Choice
A billion electrons are added to a body, its charge becomes
1.6 X 10-19 C
1.6 X 10-28 C
-1.6 X 10-10 C
-1.6 X 10-28 C
- 2. Multiple Choice
when 1014 electrons are removed from a neutral metal sphere, the charge on the sphere becomes:
16 X 10-6 C
-16X 10-6 C
32 10-6 C
-32X 10-6 C
- 3. Multiple Choice
A soap bubble is given a negative charge then its radius :
decreases
increases
remains un-changed
insufficient information.
- 4. Multiple Choice
In a circuit 20 C of charge is passed through a battery in a given time. The plates of the battery are maintained at PD of 20 V . Howmuch work is done by the battery?
400 J
300 J
200 J
100 J
- 5. Multiple Choice
Suppose the electrostatic potential at some points in space are given by V = ( x2 - 2x ). The electrostatic field strength at X= 1 is :
zero
-2
2
4
- 6. Multiple Choice
A sure test of electrification is
attraction
repulsion
friction
induction
- 7. Multiple Choice
Two charges of 20μC and -50μC are placed 80 cm apart. The distance of the point from the smaller charge where the intensity will be zero is:
20 cm
35 cm
30 cm
25 cm
- 8. Multiple Choice
Flux coming out from a positive unit charge placed in air is :
ε0
ε0-1
4πε0
(4πε0 )-1
- 9. Multiple Choice
The electric flux passing through the sphere, if an electric dipole is placed at the centre of a sphere is :
1/ε0
2/ ε0
zero
none of these
- 10. Multiple Choice
Two charges +q and -3q are placed at a distance of 1m apart. The points on the line joining two charges, where electric potential is zero, is :
0.25 m, 0.5 m
1 cm , 0.50 m
0.35 cm , 24 cm
none of these
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