ECAT Pre Computer Science Chapter 12 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 12 Electrostatics

Try The MCQ's Test For ECAT Physics Chapter 12 Electrostatics

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ECAT Physics Chapter 12 Electrostatics

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Question # 1

A conducting wire is drawn to double its length. Final resistivity of the material will be

Question # 2

The relation between charge 'Q' and current 'I' is given by

Question # 3

Coulomb force, when any material medium is placed between two charges

Question # 4

If a charged spherical conductor of radius 10 cm has potential V at a point distance 5 cm from its centre, then the potential at a point distance 15 cm from the centre will be

Question # 5

Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?

Question # 6

The potential difference across each resistance in series combination is

Question # 7

Three resistance 500,500 and 50 ohms are connected in series across 555 volts mains. The current flowing through them will be

Question # 8

In case of a parallel plate capacitor if the plate separation is doubled and plate area is halved, the capacitance becomes

Question # 9

A capacitor of capacity 1μF is charged to 1 KV. The energy stored in J

Question # 10

The value of electrical constant of proportionality k is

Question # 11

Resistance of a conductor depends upon

Question # 12

For two resistance wires joined in parallel, the resultant resistance is 6/5 ohm. When one of the resistance wire breaks, the effective resistance becomes 2 ohm. The resistance of the broken wire is

Question # 13

One electron volt is equal to

Question # 14

If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy

Question # 15

The SI unit of electric flux is

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 A conducting wire is drawn to double its length. Final resistivity of the material will be
A. Double of the original one
B. Half of the original one
C. One fourth of the original one
D. Same as original one
2 A certain charge liberates 0.8 g of oxygen. The same charge will liberate. how many g of silver?
A. 108 g
B. 10.8 g
C. 0.8 g
D. 108/0.8 g
3 Ohm is the unit of
A. current
B. capacitance
C. energy
D. resistance
4 A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes
A. 2R
B. 4R
C. 16R
D. Zero
5 A cube of metal is given a positive charge Q. For the above system, which of the following statements is true?
A. Electric potential at the surface of the cube is zero
B. Electric potential within the cube is zero
C. Electric filed is normal to the surface of the cube
D. Electric filed varies within the cube
6 At any point on the right bisector of the line joining two equal and opposite charges
A. At electric field is zero
B. The electric potential is zero
C. The electric potential decreases with increasing distance from the centre
D. The electric field is perpendicular to the line joining the charges
7 If a charged spherical conductor of radius 10 cm has potential V at a point distance 5 cm from its centre, then the potential at a point distance 15 cm from the centre will be
A. 1/3 V
B. 2/3 V
C. 3/2 V
D. 3V
8 The force of repulsion between two point charges is F, when these are at a distance 0.1 m apart. Now the point charges are replaced by sphere of radii 5 cm each having the same charge as that of the respective point charges. The distance between their centre is again kept 0.1 m ; then the force of repulsion will
A. Increase
B. Decrease
C. Remain F
D. Become 10F/9
9 A wire is bent into a ring of radius R is given a charge q. The magnitude of the electrical field at the centre of the ring is
A. Two
B. 1/2
C. Zero
D. 3/2
10 Magnetic effect at a point caused due to flow a current depend upon the
A. Quantity of current
B. Distance from current
C. Both the quantity of current and distance from current element
D. None of the all

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