Homework Practice

Printable assignment

Electric World: Circuits, Power and Magnetic Effects

Section A: Electricity, Circuits and Power

Question 1mcq

Ohm’s law states that:

A.R = VI

B.V = IR

C.P = VI

D.I = VR

Question 2mcq

If V = 12 V and R = 4 Ω, what is the current?

A.3 A

B.4 A

C.48 A

D.2 A

Question 3mcq

The SI unit of resistance is:

A.Ohm

B.Watt

C.Volt

D.Ampere

Question 4mcq

Two resistors of 2 Ω and 3 Ω are connected in series. Total resistance is:

A.1 Ω

B.5 Ω

C.6 Ω

D.2.5 Ω

Question 5mcq

Electrical power is calculated as:

A.P = I/V

B.P = V + I

C.P = VI

D.P = R/I

Question 6mcq

A fuse protects a circuit by:

A.Removing resistance

B.Melting when current becomes too high

C.Producing light

D.Increasing current always

Section B: Magnetic Effects and Safety

Question 7mcq

A current-carrying wire produces:

A.Only sound

B.A magnetic field

C.Only heat and no field

D.Only gravity

Question 8mcq

The device used to detect current in a circuit is:

A.Galvanometer

B.Thermometer

C.Barometer

D.Speedometer

Question 9mcq

In domestic wiring, appliances are usually connected in:

A.Parallel

B.Random order without voltage

C.Series only

D.A circle without wires

Question 10mcq

The earth wire is used mainly for:

A.Making bulbs brighter only

B.Reducing room temperature

C.Increasing the bill

D.Safety from electric shock

Question 11mcq

The direction of magnetic field around a straight current-carrying conductor can be found using:

A.Left-foot rule

B.Right-hand thumb rule

C.Mirror rule

D.Clock rule only

Question 12mcq

Which material is commonly used for making heating elements?

A.Nichrome

B.Wood

C.Plastic

D.Rubber