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Electricity

Description: Current Electricity
Number of Questions: 25
Created by:
Tags: Current Electricity Electric Charge and Current Factors Affecting Resistance Electric Power and Energy Potential and Potential Difference Resistivity and Factors Affecting Resistivity Equivalent Combination of Resistances in Parallel and Series
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If resistance decreases, then the current will ___________.

  1. increase

  2. remain the same

  3. decrease

  4. double

  5. constant

Show answer
Correct Option: A
Explanation:

Resistance is inversely proportional to current. Therefore current increases  when the  resistance decreases.

The direct proportionality between power and voltage used is in which of the given formula -

  1. P = VI

  2. V = IR

  3. P = IR

  4. Power = energy/time

  5. P = I2R

Show answer
Correct Option: A
Explanation:

Power desipated in resistance=voltage supplied. Current flowing through resistance.

What is the maximum power rating in Watts of a resistor, which has a voltage of 12V across it and a current of 50mA flowing through it.

  1. 0.24 Mwatts

  2. 4.16 mwatts

  3. 0.6 watts

  4. 6000 watts

  5. 0.4 watt

Show answer
Correct Option: C
Explanation:

P=V * I =12 * 50 m amp =0.6 watt

The unit of current is __________.

  1. amp

  2. volt

  3. coulomb

  4. watt

  5. Hz

Show answer
Correct Option: A
Explanation:

The unit of current is ampere, therefore this answer is correct.

Which materials consist of a number of free electrons?

  1. Conductors

  2. Insulators

  3. Thermal insulator

  4. Dielectric

  5. Wire enamel

Show answer
Correct Option: A
Explanation:

In an atom the free electrons are present at the outermost orbit. It can easily flow from one atom to another by applying voltage. So it is called a conductor.

The unit of electrical charge is the _____________.

  1. watt

  2. Amp

  3. Hz

  4. coulomb

  5. volt

Show answer
Correct Option: D
Explanation:

1 coulomb is the charge carried by 6.25*1018 electrons.

Find the amount of electric charge that flows through the circuit. If current of 0.5 A is drawn by a filament of an electric bulb for 10 minutes.

  1. 300 C

  2. 5 C

  3. 300 C

  4. 20 C

  5. 600 C

Show answer
Correct Option: A
Explanation:

We have I = Q/t where, t= 10*60 sQ = It = 0.5 A × 600 s = 300 C

Give the type of resistor whose tolerance rating is 5% or greater.

  1. General-purpose

  2. Wirewound

  3. Carbon-Composition

  4. Metal-Film Resistors

  5. Precision

Show answer
Correct Option: A
Explanation:

General-purpose resistors have a tolerance between 5% and 20%.

If a 120 volt light bulb is connected in a circuit then calculate current used by a 100 watt?

  1. 1.2 amps

  2. 12000 amps

  3. 830 mA

  4. 300 mA

  5. 12 mamp

Show answer
Correct Option: C
Explanation:

Power = current * voltage current = power / voltage I=100 / 120= 0.833 =830 mA

Consider if three resistors R1, R2, R3 are connected in parallel and dissipate 20 W by each resistor. Calculate total power?

  1. 20 W

  2. 1 W

  3. 30 W

  4. 60 W

  5. 3 W

Show answer
Correct Option: D
Explanation:

The total power dissipated by the circuit can also be calculated by multiplying the total current squared times the total resistance. P = I2R + I2R + I2R P= P1 + P2 + P3 P= 20 + 20 + 20 P = 60 W.

The resistance value for a blue, gray, red, silver resistor is _______.

  1. 6,120

  2. 612

  3. 6,800

  4. 6,210

  5. 601

Show answer
Correct Option: A
Explanation:

According to resistor colour codeBlue = 6, gray = 8, Red = 2, black=0. So 6800 Ohms or 6.8k Ohms and tolerance is 10 % therefore 6800-680=6120 ohms.

A wire of a given material has a resistance of 4 Ω. Calculate the resistance of another wire of the same material having length l/2 and area of cross-section 2A?

  1. 2 Ω

  2. 0.5 Ω

  3. 8 Ω

  4. 1 Ω

  5. 16 Ω

Show answer
Correct Option: D
Explanation:

R1 = R2R1 = ρl/A = 4ΩR2 = (ρl/2)/2A = ¼ [ρl/A]= ¼ x 4Ω = 1Ω.The resistance of the new wire is 1Ω.

If 2.5 × 10–6 coulomb of charge from point D to point E, in an electric field requires 6.3 × 10–4 joule of work. Calculate potential difference between points D and E.

  1. 2.5 × 10–6 V

  2. 2.5 × 10–2 V

  3. 0.396 × 10–2 V

  4. 15.75 × 10–6 V

  5. 15.75 × 10–2 V

Show answer
Correct Option: C
Explanation:

V=W/q, work and charge. Therefore 6.3 × 10-4 / 2.5 × 10-2= 0.396× 10–2 V.  

Which device converts Mechanical Energy to Electrical Energy?

  1. Rheostat

  2. Generator

  3. Solar cell

  4. Battery

  5. Motor

Show answer
Correct Option: B
Explanation:

Generator = Mechanical Energy to Electrical Energy.

Give the resistance value for a brown, red, yellow, and gold resistor.

  1. 1,620

  2. 1,260

  3. 1,26,000

  4. 120

  5. 1,200

Show answer
Correct Option: C
Explanation:

According to resistor colour code brown= 1, red= 2, blue= 6, yellow= 4. Therefore value is: 120000 with +5%, we have to add max resistance, i.e.,  120000+5%=126000 ohms

Which of the following is not a type of energy source?

  1. Rheostat

  2. Solar cell

  3. Generator

  4. Battery

  5. Motor

Show answer
Correct Option: A
Explanation:

Rheostat = Variable resistance.

If two positively charged materials are placed together then it will __________.

  1. repel

  2. attract

  3. become neutral

  4. become negative

  5. become positive

Show answer
Correct Option: A
Explanation:

Like charge repel each other and unlike charge attract each other.

Which of the options correctly show the number of connections a rheostat has?

  1. 1

  2. 2

  3. 4

  4. 3

  5. 5

Show answer
Correct Option: B
Explanation:

The most common way to vary the resistance in a circuit is to use a rheostat, a two-terminal variable resistor.

Give the quantities which are same in all the part of series circuit:

  1. voltage

  2. current

  3. resistance

  4. power

  5. energy

Show answer
Correct Option: B
Explanation:

In a series circuit, the current through each of the components is the same, and the voltage across the circuit is the sum of the voltages across each component

If 8 ohm is the resistance then what is the conductance?

  1. 16 ms

  2. 4 ms

  3. 8 ms

  4. 125 mS

  5. 12.5 ms

Show answer
Correct Option: D
Explanation:

Conductance is the reciprocal of the resistance G=1/R, where R= resistance 1/8=0.125=125ms.

Electrons present in the outer orbit are called __________.

  1. valences

  2. nuclei

  3. waves

  4. shells

  5. bound

Show answer
Correct Option: A
Explanation:

Valence electrons are the electrons in the outer-most shell of the atom.

Two positively negatively charged materials placed together will _________.

  1. attract

  2. repel

  3. become neutral

  4. become negative

  5. become positive

Show answer
Correct Option: A
Explanation:

Like charge Repel each other and Unlike charge attract each other.

Charge 8/10 passes a point in 4 s. Then current in amperes is __________.

  1. 11 A

  2. 40 A

  3. 0.2 A

  4. 5 A

  5. 320 A

Show answer
Correct Option: C
Explanation:

Current (ampere, A) = charge (coulomb, C) / time (second, s) i = Q / t i = (8/10)/4 i = 2/10 i = 0.2 A.

Resistor consisting of a three-terminal variable is known as a ___________.

  1. rheostat

  2. potentiometer

  3. thermistor

  4. wiper

  5. varistor

Show answer
Correct Option: B
Explanation:

The three-terminal variable resistor is also known as the potentiometer.

When the current is 2.5 A then calculate charge per point in 0.2 s?

  1. 0.5 C

  2. 12.5 C

  3. 0.08 C

  4. 1 C

  5. 0.008 C

Show answer
Correct Option: A
Explanation:

i = Q / t Q = i*t =2.5 * 0.2 = 0.5c

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