Olympiad Test: Our Necessities -1 - Free MCQ with solutions Class 4 Science

Clothes serve multiple purposes: they cover the body, provide comfort and protection from the elements, and can be designed to be attractive and express personal style.

Eskimos traditionally use fur in their clothing to provide insulation against the harsh, cold climates they live in.

Insignias means a distinguishing badge or emblem of military rank, office, or membership of an organization.

Football players wear protective padding to shield themselves against injuries during the physical contact that occurs in the game.

Cotton fibers swell when they absorb water, which increases the friction among the fibers, thus enhancing the fabric's strength when wet.

The cotton plant is characteristically bushy with a dense spread of branches growing the cotton bolls.

Cotton buds take about 21 days to blossom into flowers before eventually forming cotton bolls.

Cotton fibers have a moisture absorption capacity of about 8.5%, which contributes to their comfort as clothing material by helping regulate body moisture.

• Silk is known for being both strong and lustrous.
• Linen is strong but not notably lustrous, and wool, while durable, lacks the pronounced lustre of silk. Cotton is neither particularly strong nor lustrous.
• Therefore, the correct answer is silk.

Silk fiber was first developed in ancient China, with its production being a closely guarded secret for centuries.

Synthetic yarns, such as nylon and polyester, were introduced in the 20th century. These materials were developed to provide durable alternatives to natural fibers and have since become widely used in the textile industry.

Rayon is considered artificial silk due to its silk-like feel and appearance, although it is made from regenerated cellulose.

Polyester is often called the "work horse" of the textile industry due to its strong, durable nature and wide range of uses.

A measuring tape is essential for taking accurate body measurements, which are crucial for fitting clothing properly.

The existing weather conditions in an area can influence the material used, the shape, and the overall design of houses to optimize comfort and functionality.