**1. The coulomb electrostatic force is defined for?**

1) Two spherical charges at rest

2) two spherical charges in motion

3) two point charges in motion

4) two point charges at rest

**2. The path of a charged particle projected into a uniform electric field is?**

1) Circle

2) hyperbola

3) parabola

4) ellipse

**3. Gauss’s law is true only if force due to a charge varies as?**

1) r-1

2) r-2

3) r-3

4) r-4

**4. A proton and an α- particle start from rest in a uniform electric field, then the ratio of times of flight to travel same distance in the field is?**

1) √5: √2

2) √3: 1

3) 2 : 1

4) 1 : √2

**5. The magnitude of the electric field on the surface of a sphere of radius r having a uniform surface charge density σ is?**

1) σ/EO

2) σ/2EO

3) σ/EOr

4) σ/2EOr

**6. if a hemispherical body is placed in a uniform electric field E. then the flux linked with the curved surface is?**

1) 2πR2

E 2) πR2 E

3) 4πR2 E

4) 6πR2 E

**7. An electric dipole kept in a uniform electric field experiences?**

1) A force and a torque

2) a force but not a torque

3) a torque but not a force

4) neither a force nor a torque

**8. The electric intensity E, and potential V on the perpendicular bisector of an electric dipole are?**

1) E=0, V= 0

2) E≠0, V≠0

3) E≠0, V= 0

4) E= 0, V≠0

**9. The capacity of parallel plate condenser depends on?**

1) The type of metal used

2) the thickness of plates

3) the potential applied across the plates

4) the separation betwine the plates

**10. The value of dielectric constant (K) in case of metals is?**

1) One

2) infinity

3) zero

4) two

**11. The potential at the origin is zero due to electric field E= 20i + 30i Nc-1. The potential at point p(2m1 2m)**

1) IV

2) -100V

3) 10V

4) 2V**12. A charged sphere is connected a similar uncharged sphere then percentage loss of energy is?**

1) 50 %

2) 25 %

3) 20 %

4) 10%

**13. The capacity of parallel plate capacitor of each plate area of 10cm x 10 cm and separated by a distance 1mm?**

1) 88.42 PF

2) 8 PF

3) 2PF

4) 10PF**14. n drops each of radius ‘r’ and carrying a charge ‘q’ are combined to form a bigger drop. The ratio of potentials of bigger to that of smaller is?**

1) N3/2: 1

2) n1/3: 1

3) n2/3: 1

4) n3/4:1

**15. A parallel plate capacitor has capacitance of 2µF and 12µF when immersed in oil the dielectric constant of the oil is?**

1) 5

2) 4

3) 3

4) 6

**16. The energy stored in the capacitor is?**

1) ½ cv2

2) ½ QV2

3) ½.Q/C

4) ½ Q/C2

**17. Drift velocity of free electrons is related to?**

1) Under uniform electric filed

2) under non-uniform electric filed

3) under uniform magnetic field

4) under non-uniform magnetic field

**18. According to ohm’s law the graph I versus V gives**?

1) Straight line with Y-Intercept

2) straight line passing through origin

3) parabola with positive slope

4) None

**19. If the temperature of the metallic conductors increases, then resistance of it is?**

1) Increases

2) decreases

3) remain same

4) zero

**20. Fuse wire is used in electrical power meters because It has?**

1) High resistivity

2) low melting point

3) both

4) high melting point

**21. The elements of heating devices are made up of?**

1) Copper

2) aluminium

3) nichrome

4) tungsten

**22. At absolute zero resistivity of any metal becomes?**

1) Zero

2) infinity

3) no change

4) does not depend on temperature

**23. Temperature coefficient of resistance is positive for?**

1) Silver

2) silicon

3) carbon

4) electrolyte

**24. Which one given bellow is an irreversible phenomena?**

1) Coulomb’s law

2) Gauss’s law

3) Ohm’s law

4) Joule’s law

**25. Five identical resistances of each 25 ohms are connected parallel than effective resistance is?**

1) 3

2) 4

3) 5

4) 6

**26. ‘n’ resistors cache of resistance R are first connected in series and then in parallel, the ratio of resistances in two cases?**

1) n2:1

2) n:1

3) 1:n2

4) 1:n

**27. For making standard resistance wire of following material is used**

1) Nichrome

2) Copper

3) Silver

4) Manganin**28. To supply maximum current, cells should be arrange in**

1) series

2) parallel

3) mixed grouping

4) depends on the internal & external resistance

**29. Back emf of a cell is due to **

1) Electrolytic polarisation

2) peltier effect

3) Magnetic effect

4) None

**30. Kirchhoff’s laws are based on?**

1) conservation of charge, conservation of energy

2) conservation of charge, conservation of momentum

3) conservation of energy, conservation of momentum

4) conservation of charge only

**31. Three resistances 1Ω, 2Ω, 3Ω are connected in parallel. The ratio of currents passing through them when potential applied across the ends is**

1) 2:3:6

2) 1:2:3

3) 1:1:1

4) 6:3:2

**32. When two identical wires made of different materials having resistivities S1 and S2, Effective resistivity in series is?**

1) (S1+S2)/2

2) S1+S2

3) 2(S1+S2)

4) S1 S2

**33. current ‘i’ is flowing in hexagonal coil of side a the magnetic induction at the centre of the coil is?**

1) 3√3 µoi/πa

2) µoi/3√3πa

3) µoi/√3πa

4) √3µoi/πa

**34. A Wire of length ‘L’ meters carrying a current ‘i’ amperes is bent in the form of a circle. the magnitude of its magnetite moment is?**

1) iL/4π

2) iL2 /4π

3) i2 L/4π

4) i2 L2 /4π

**35. Which of the following are not accelerated by a cyclotron**

1) proton

2) α – particle

3) newton

4) both 2 and 3