Science Practice Quiz 208

Q1.Why are LED bulbs increasingly preferred (as of Reprint 2024-25) over incandescent bulbs, fluorescent tubes, or CFLs?

A. They are easier to install in existing fixtures B. They produce a higher amount of heat, which is beneficial C. They consume less electricity for producing a given intensity of light D. They are significantly cheaper to purchase

Q2.According to the provided text, what is one reason for a short circuit in electrical circuits?

A. Connecting too few devices to a single socket. B. Direct touching of wires due to insulation wear and tear. C. Using wires made of special materials. D. Inserting fuses in all electrical circuits.

Q3.What is identified as a cause for overload in an electrical circuit?

A. The use of a single, high-capacity device. B. Connecting many devices to a single socket. C. Wires made from special melting materials. D. Proper insulation on electrical wires.

Q4.What common hazard is reported in newspapers as being caused by short circuits and overloads?

A. Power outages. B. Fires. C. Voltage fluctuations. D. Equipment damage.

Q5.What can happen to a wire if a large electric current passes through it?

A. It may become cooler and more conductive. B. It may become so hot that it melts and breaks. C. It may generate a magnetic field without heating. D. It may increase its resistance indefinitely.

Q6.What is the primary function of an electric fuse in a circuit, as described in the provided text?

A. To increase the current flow in the circuit. B. To regulate the voltage supply. C. To act as a safety device by breaking the circuit if current exceeds a safe limit. D. To store electrical energy for later use.

Q7.Wires used for making electric fuses are characterized by which property?

A. They are made from materials that resist melting. B. They are made from special materials that melt quickly and break when large electric currents pass through them. C. They are made from highly conductive materials that never heat up. D. They are made from materials that glow brightly when current passes.

Q8.Where are fuses typically inserted in buildings, according to the information provided?

A. Only in the main power supply unit. B. In all electrical circuits. C. Only in high-power appliance circuits. D. Only in lighting circuits.

Q9.What caution is advised regarding investigating electric fuses in the provided text?

A. Always investigate fuses connected to mains circuit on your own. B. Never try to investigate an electric fuse connected to mains circuit on your own. C. Only investigate fuses after increasing the current. D. It is safe to investigate fuses if the power is on.

Q10.According to Activity 10.4, what is steel wool commonly used for?

A. Insulating electrical wires. B. Cleaning utensils. C. Conducting experiments with high resistance. D. Making electric bulbs glow.

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Science Practice Quiz 208