# Multiple choice question for engineering

## Set 1

1. Magnetic field lines seek the path of __________ resistance.

a) Maximum

b) Minimum

c) Infinite

d) Zero

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2. Magnetic field lines form _________ loops from pole to pole.

a) Open

b) Closed

c) Branched

d) Either closed or branched

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3. Do magnetic flux lines intersect?

a) Yes

b) No

c) Depends on the situation

d) Cannot be determined

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4. Magnetic field lines ___________ at the south pole.

a) Emerge

b) Converge

c) Neither emerge nor converge

d) Either emerge or converge

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5. Magnetic field lines ___________ at the north pole.

a) Emerge

b) Converge

c) Neither emerge nor converge

d) Either emerge or converge

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6. Field lines move from __________

a) North to south

b) South to north

c) West to east

d) East to west

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7. Inside the magnet, field lines travel from?

a) North to south

b) South to north

c) West to east

d) East to west

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8. Can we see magnetic flux lines?

a) Yes

b) No

c) Depends on the strength of the field

d) Only when field strength is very large

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9. Lines of magnetic flux which are parallel and in the same direction __________ each other.

a) Attract

b) Repel

c) Intersect

d) Cancel

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10. More the number of magnetic flux lines, _______ is the force of the magnet.

a) Greater

b) Lesser

c) Either greater or lesser

d) Neither greater nor lesser

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## Set 2

1. Which among the following expressions relate charge, voltage and capacitance of a capacitor?

a) Q=C/V

b) Q=V/C

c) Q=CV

d) C=Q2V

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2. If a 2F capacitor has 1C charge, calculate the voltage across its terminals.

a) 0.5V

b) 2V

c) 1.5V

d) 1V

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3. What is the voltage across a capacitor at the time of switching, that is, when t=0?

a) Infinity

b) 0V

c) Cannot be determined

d) 1V

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4. What is the voltage across the capacitor if the switch is closed and steady state is reached?

a) 8V

b) 0V

c) 10V

d) Infinity

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5. If one plate of a parallel plate capacitor is charged to positive charge the other plate is charged to?

a) Positive

b) Negative

c) Positive of negative

d) Not charged

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6. When voltage across a capacitor increases, what happens to the charge stored in it?

a) Increases

b) Decreases

c) Becomes zero

d) Cannot be determined

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7. When will capacitor fully charged?

a) When the voltage across its plates is half the voltage from ground to one of its plates

b) When current through the capacitor is a 1/root2 time its value

c) When the supply voltage is equal to the capacitor voltage

d) Never

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8. What happens to the current flow in a fully charged capacitor?

a) Current flow stops

b) Current flow doubles

c) Current flow becomes half its original value

d) Current flow becomes one-fourth its original value

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9. Calculate the capacitance of a capacitor that stores 40microC of charge and has a voltage of 2V.

a) 20F

b) 20microF

c) 10F

d) 10microF

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10. What happens to the capacitance when the voltage across the capacitor increases?

a) Decreases

b) Increases

c) Becomes 0

d) No affect

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## Set 3

1. Which of the following charging and discharging of a capacitor?

a) Time constant

b) Current

c) Power

d) Voltage

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2. What is the initial current while charging a capacitor?

a) High

b) Low

c) 0

d) Cannot be determined

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3. What is the final current while charging a capacitor?

a) High

b) Zero

c) Infinity

d) Low

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4. What happens to the current flow in a fully charged capacitor?

a) Current flow stops

b) Current flow doubles

c) Current flow becomes half its original value

d) Current flow becomes one-fourth its original value

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5. A capacitor is charged to a voltage of 400V and has a resistance of 20ohm. Calculate the initial value of discharge current.

a) 10A

b) 0A

c) Infinity

d) 20A

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6. A capacitor is charged to a voltage of 400V and has a resistance of 20ohm. Calculate the final value of discharge current.

a) 10A

b) 0A

c) Infinity

d) 20A

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7. When will be capacitors fully charged?

a) When voltage is zero

b) When the supply voltage is equal to the capacitor voltage

c) When voltage is infinity

d) When capacitor voltage is equal to half the supply voltage

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8. What happens to the capacitor when the capacitor voltage is equal to the source voltage?

a) The charging phase of the capacitor is over

b) The discharging phase of the capacitor is over

c) The capacitor is switched off

d) The capacitor is switched on

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9. A capacitor is charged to a voltage of 400V and has a resistance of 20ohm. Calculate the final value of charging current.

a) 10A

b) 0A

c) Infinity

d) 20A

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10. A capacitor is charged to a voltage of 400V and has a resistance of 20ohm. Calculate the initial value of charging current.

a) 10A

b) 0A

c) Infinity

d) 20A

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## Set 4

1. What is the equivalent inductance when inductors are connected in series?

a) Sum of all the individual inductances

b) Product of all the individual inductances

c) Sum of the reciprocal of all the individual inductances

d) Product of the reciprocal of all the individual inductances

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2. When inductances are connected in series, the equivalent inductance is ____________ the largest individual inductance.

a) Greater than

b) Less than

c) Equal to

d) Not related to

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3. Three inductors having inductance values 3H, 4H and 5H are connected in series, calculate the equivalent inductance.

a) 10H

b) 12H

c) 3H

d) 5H

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4. Calculate the equivalent inductance between A and B.

a) 30H

b) 54H

c) 44H

d) 60H

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5. When inductors are connected in series, the voltage across each inductor is _________

a) Equal

b) Different

c) Zero

d) Infinity

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6. If there are two bulbs connected in series and one blows out, what happens to the other bulb?

a) The other bulb continues to glow with the same brightness

b) The other bulb stops glowing

c) The other bulb glows with increased brightness

d) The other bulb also burns out

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7. Voltage across a series resistor circuit is proportional to?

a) The amount of time the circuit was on for

b) The value of the inductance itself

c) The value of the other inductances in the circuit

d) The power in the circuit

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8. What is the voltage measured across a series short?

a) Infinite

b) Zero

c) The value of the source voltage

d) One

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9. In a series circuit, which of the parameters remain constant across all circuit elements such as resistor, capacitor, inductor etcetera?

a) Voltage

b) Current

c) Both voltage and current

d) Neither voltage nor current

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10. Batteries are generally connected in?

a) Series

b) Parallel

c) Either series or parallel

d) Neither series nor parallel

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## Set 5

1. Potential drop in a dielectric is equal to _______

a) Electric field strength*thickness

b) Electric field strength*area of cross section

c) Electric field strength

d) Zero

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2. The electric field strength is 10N/C and the thickness of the dielectric is 3m. Calculate the potential drop in the dielectric.

a) 10V

b) 20V

c) 30V

d) 40V

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3. The electric fields of dielectrics having the same cross sectional area in series is related to their relative permittivities in which way?

a) Directly proportional

b) Inversely proportional

c) Equal

d) Not related

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4. What happens to the capacitance when a dielectric is introduced between its plates?

a) Increases

b) Decreases

c) Remains the same

d) Becomes zero

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5. Calculate the relative permittivity of the second dielectric if the relative permittivity of the first is 4. The electric field strength of the first dielectric is 8V/m and that of the second is 2V/m.

a) 32

b) 4

c) 16

d) 8

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6. What happens to the potential drop between the two plates of a capacitor when a dielectric is introduced between the plates?

a) Increases

b) Decreases

c) Remains the same

d) Becomes zero

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7. If the potential difference across the plates of a capacitor is 10V and a dielectric having thickness 2m is introduced between the plates, calculate the potential difference after introducing the dielectric. The electric field strength is 2V/m.

a) 4V

b) 6V

c) 8V

d) 10V

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8. Calculate the capacitance if the dielectric constant=4, area of cross section= 10m^{2} and the distance of separation between the plates is 5m.

a) 7.08*10^{-11}F

b) 7.08*10^{11}F

c) 7.08*10^{-12}F

d) 7.08*10^{-10}F

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^{-11}F.

9. A dielectric is basically a ________

a) Capacitor

b) Conductor

c) Insulator

d) Semiconductor

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10. What happens to the potential difference between the plates of a capacitor as the thickness of the dielectric slab increases?

a) Increases

b) Decreases

c) Remains the same

d) Becomes zero