NEET Physics Electricity MCQs Set B

What is the maximum resistance he can obtain by connecting them ?
(A) 1Ω
(B) 5Ω 

(B) Ite
(C) e/It
(D) It/e

6. Conventionally, the direction of the current is taken as -
(A) the direction of flow to negative charge
(B) the direction of flow of atoms
(C) the direction of flow of molecules
(D) the direction of flow of positive charge

7. The unit of specific resistance is :-
(A) ohm
(B) mho
(C) ohm-metre
(d) ohm per metre

8. If the length of a wire is doubled and its cross-section is also doubled, then the resistance will -
(A) increase eight times
(B) decrease four times
(C) become four times
(D) remain unchanged

9. A suitable unit for expressing the strength of electric field is -
(A) V/C
(B) C/m
(C) N/C
(D) C/N

10. 1 volt equals :-
(A) 1 joule
(B) 1 joule per coulomb
(C) 1 coulomb per metre
(D) 1 newton per coulomb

21. If the charge is moved against the coulomb force of an electric field -
(A) Work is done by the electric field
(B) Energy is used from some outside force
(C) The strength of the field is decreased
(D) The energy of the system is decreased

22. The ratio of the forces between two small spheres with constant charge (a) in air (b) in a medium of dielectric constant K is-
(A) 1 : K
(B) K : 1
(C) 1 : K2
(D) K2 : 1

23. If a unit positive charge is taken from one point to another over an equipotential surface, then -
(A) Work is done on the charge
(B) Work is done by the charge
(C) Work done is constant
(D) No work is done

24. Electric lines of force about negative point charge are-
(A) Circular, anticlockwise
(B) Circular, clockwise
(C) Radial, inward
(D) Radial, outward

25. Electric intensity at a place due to a, charged conductor is a -
(A) Scalar quantity
(B) Vector quantity
(C) Neither scalar nor vector
(D) None of these

26. If a glass rod is rubbed with silk, it acquires a positive charge because-
(A) Protons are added to it
(C) Electrons are added to it
(B) Protons are removed from it
(D) Electrons are removed from it

29. I f a 0.1% increase in length due to stretching, the percentage increase in its resistance will be -
(A) 0.2%
(B) 2%
(C) 1%
(D) 0.1%

30. There are 8 equal resistances R. Two are connected in parallel, such four groups are connected in series, the total resistance
(A) R/2
(B) 2R
(C) 4R
(D) 8R

31. In a conductor 4 coulombs of charge flows for 2 seconds. The value of electric current will be-
(A) 4V
(B) 4A
(C) 2A
(D) 2V

32. In a conductor, the flow of current is :-
(A) Flow of molecules
(B) Flow of free electrons
(C) Flow of positive charge
(D) Flow of ions

33. Three resistances of magnitude 2, 3 and 5 ohm are connected in parallel to a battery of 10 volts and of negligible resistance. The potential difference across 3Ω resistance will be-
(A) 2V
(B) 3V
(C) 5V
(D) 10V

34. Which of the fol lowing hav e highest conductivity
(A) Cu
(B) Insulator
(C) Semiconductor
(D) All are equal

54. Two wires of same material and same mass have their lengths in the ratio 1 : 2. Their electrical resistances are in the ratio
(A) 1 : 1
(B) 1: 2
(C) 2: 1
(D) 1: 4

55. Four 20 ohm resistors are connected together to form a square. The resistance between opposite corners will be :-
(A) 20 ohm
(B) 22 ohm
(C) 24 ohm
(D) 24.8 ohm

56. The cost of electricity is about 30 paise per unit for household use. This unit is the same as
(A) ohm
(B) ampere
(C) volt
(D) kilowatt-hour

57. A fuse wire should have
(A) low resistance and low melting point
(B) low resistance and high melting point.
(C) high resistance and low melting point.
(D) high resistance and high melting point.

58. Two lamps X and Y are connected in series.
The lamp X glows lighter than Y. Then
(A) the resistance of X is greater than the resistance of Y.
(B) the resistance of X is lesser than the resistance of Y.
(C) the resistance of X is equal to the resistance of Y.
(D) there is no relation between the resistances