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1. The electric flux in a charged spherical conductor is :
A) Zero inside and outside the sphere
B) Maximum inside the sphere and zero outside
C) Zero inside the sphere and decreases with distance outside the sphere
D) Maximum inside the sphere and decreases with distance outside the sphere
2. Two Charges +1 micro coulomb and +4 micro coulomb are situated at a distance in air. The ratio of the forces acting on them is :
A) 1:4
B) 4:1
C) 1:1
D) 1:16
3. An electric charge q is enclosed in a sphere, what would be the effect on electric flux linked to the spherical surface if the radius of the sphere increases :
A) Increases
B) Decreases
C) Remains Same
D) Zero
4. The intensity of electric field at the surface of conducting hollow sphere is 10 N/C and its radius is 10 cm. The value of electric field at the centre of sphere is:
A) Zero
B) 10 N/C
C) 1 N/C
D) 100 N/C
5. . Two identical metallic spheres having charges +4q and -2q are placed with their centres r distance apart. Force of attraction between the spheres is F. If the two spheres are brought in contact and then placed at the same distance r apart, the force between them is :
A) F
B) F/2
C) F/4
D) F/8
6: IS Derivation
7. A charge on a sphere of radius 2 cm is 2 Coulomb where charge on sphere of radius 5 cm is 5 Coulomb. Find the ratio of an electric field on distance of 10 cm from the centre of the sphere:
A) 1 : 1
B) 2 : 5
C) 5 : 2
D) 4 : 25
8. The maximum electric field that a dielectric medium of a capacitor can withstand without break down (if its insulating property) is called its:
A) Polarisation
B) Capacitance
C) Dielectric strength
D) None of these
9. On bringing an electron near to the other electron, the potential energy of the system:
A) Decreases
B) Increases
C) Remains same
D) becomes zero
10. What is the geometrical shape of equipotential surfaces due to a single isolated charge?
A) spherical shape
B) Plain surface
C) Triangular
D) Square surface
11. A resistor has a colour code of green, blue, brown, and silver. What is its resistance?
A) 5600 ohm ± 10%
B) 560 ohm ± 5%
C)560 ohm ± 10%
D) 56 ohm ± 5%
12. The relation between E.M.F of a cell and the terminal potential difference is:
A) E = V
B) E > V
C) E < V
D) E = V/2
14. The internal resistance of a 2.1 V cell which hives a current of 0.2 A through a resistance of 10 ohm is:
A) 0.2 ohm
B) 0.5 ohm
C) 0.8 ohm
D) 1.0 ohm
15. A potential difference is applied to a copper wire of length l and diameter is d. If the V is doubled, then the drift velocity
A) Is doubled
B) Is halved
C) Remains same
D) Becomes zero
16. If a wire of 4 ohm resistance is stretched to double its original length then cut into two equal halves and joined parallel to each other, what is the effective resistance of the arrangement
A) 4 ohm
B) 8 ohm
C) 16 ohm
D) 2 ohm
Answers
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Answer:
1. B
2.A
3.C
4.D
5.C
6.CANT UNDERSTAND
7. A
8 .B
9. C
10.A
11. B
12. B
14.D
15. D
16.B
Explanation:
PLZ MARK IT AS BRAINLIEST PLZZ
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