Daily Trivia Quiz - Day 193 (2026-05-12)

Question 1

Why do most countries use different plug shapes, even though electricity works the same way everywhere?

Accepted Answer

Each country developed its electrical grid independently before international standards existed

Answer

Different plug shapes carry different voltage levels for safety

Answer

International trade agreements require unique plugs to protect domestic manufacturers

Answer

Plug shapes are designed to match the local frequency of electricity (50Hz vs 60Hz)

Question 2

Museums used to recommend white cotton gloves for handling artifacts. Why do many conservators now advise against them?

Accepted Answer

They reduce grip and increase the risk of dropping fragile objects

Answer

They leave cotton fibers that attract insects

Answer

They contain trace bleach that fades pigments

Answer

They trap moisture against the surface

Question 3

The first practical dishwasher was patented by a socialite who wanted her fine china washed without being chipped. Who was she?

Accepted Answer

Josephine Cochrane

Answer

Margaret Knight

Answer

Hedy Lamarr

Answer

Mary Anderson

Question 4

Many child-safety and ergonomics groups recommend that a school backpack weigh no more than about what percentage of a child's body weight?

Accepted Answer

10%

Answer

20%

Answer

30%

Answer

25%

Question 5

The rise of the modern handbag in the late 19th century was closely linked to what social change?

Accepted Answer

Women’s increasing public mobility and independent travel

Answer

The invention of synthetic leather

Answer

Laws requiring women to carry identity papers

Answer

A ban on pockets in men's clothing

Question 6

Why do some illuminated wall switches glow even when the light is off?

Accepted Answer

A tiny current powers the indicator

Answer

The switch stores daylight in the plastic

Answer

The bulb sends light backward through the wire

Answer

The wall plate contains a small battery by default

Question 7

Why is the ground pin on many three-prong plugs longer than the two flat blades?

Accepted Answer

It connects first and disconnects last

Answer

It carries twice as much voltage

Answer

It keeps the plug from overheating

Answer

It tells the outlet which appliance is attached

Question 8

What is the point of one blade being wider on many two-prong plugs?

Accepted Answer

It preserves hot and neutral orientation

Answer

It makes the appliance draw less current

Answer

It lets the plug work in more countries

Answer

It prevents dust from entering the outlet

Question 9

Why do many washing machines contain heavy concrete or metal weights?

Accepted Answer

They reduce shaking during fast spin cycles

Answer

They heat the wash water

Answer

They grind dirt out of fabric

Answer

They store detergent between washes

Question 10

Why do washing machines shake violently during the spin cycle when clothes clump to one side?

Accepted Answer

The uneven load creates an off-center force as the drum spins

Answer

The drum bearings temporarily disengage to allow faster spinning

Answer

Water trapped in the clothes permanently shifts the machine's center of gravity

Answer

The motor switches to a higher gear, causing mechanical feedback