science & technology Online Quiz - 171

Canada is the second-largest country by land area after Russia. Greenland is an autonomous territory within Denmark, China is third or fourth depending on whether coastal waters are counted, and North America is a continent containing multiple countries.

Canada is the second-largest country by land area after Russia. Greenland is not a country but an autonomous territory within Denmark. China is third or fourth depending on whether water area is included. North America is a continent, not a country.

The Trans-Canada Highway is the world's fourth-longest national highway, stretching about 7,821 km. The longest overall is the Pan-American Highway (approx 30,000 km), but as a single national highway system, Canada's is indeed among the longest.

Angel Falls in Venezuela is the world's highest uninterrupted waterfall, dropping 979 meters. Venezuela is the correct location among the options. Vancovar appears to be a typo, possibly intended to be Vancouver.

The Nile River in Africa is traditionally considered the world's longest river at approximately 6,650 kilometers. There is ongoing scientific debate about whether the Amazon might be longer, but the Nile is the commonly accepted answer. The question has a typo in Th and some incomplete option names.

The Ganges-Brahmaputra Delta, also known as the Bengal Delta, is the world's largest river delta, spanning approximately 105,000 square kilometers across Bangladesh and India. The Ganges is a major contributor to this delta system, making it the correct answer.

Brazil is world-renowned for samba dance and music, especially during the famous Rio Carnival. Samba is a fundamental part of Brazilian cultural identity and originated from African rhythms brought by enslaved people to Brazil. None of the other countries are particularly known for samba.

The statement is False. A biopsy is a medical procedure where tissue is taken from a LIVING person for examination. When tissue examination is done on a dead body, it is called an autopsy or post-mortem examination. The key difference is that biopsy requires living tissue for diagnostic purposes while autopsy is performed after death.

This is an established neuromotor pattern observed in scientific studies. Handedness correlates with preferred chewing side due to lateralized motor control in the brain. Right-handed individuals show a strong tendency to chew on the right side, and left-handed people on the left side. This is documented in dental and neuroscience literature.

Dimples are indeed caused by the variation in how the facial muscle (zygomaticus major) attaches to the skin. In people with dimples, the muscle splits into two bundles with one attaching directly to the skin, creating a depression when smiling. This is a genetic trait that is actually a dominant genetic characteristic.

The Eiffel Tower actually has 1,665 steps from ground to top, not 792. The 792 figure might be counting only specific sections or levels. The tower has three levels open to visitors, with the highest observation deck at 276 meters. The number of stairs varies slightly depending on which section you're climbing.

The cracking sound from knuckles is indeed caused by gas bubbles in the synovial fluid collapsing. When you pull or bend your finger, you create negative pressure that causes dissolved gases (mostly nitrogen and carbon dioxide) to form bubbles. When these bubbles burst, they create the characteristic cracking sound. It takes about 20 minutes for the gas to redissolve, which is why you can't crack the same knuckle repeatedly.

Human hair and fingernails do not continue to grow after death. Growth requires biological processes such as glucose metabolism and cell division, which cease entirely when a person dies. The appearance of growth is an optical illusion caused by the skin dehydrating and shrinking away from the nails and hair follicles.

A red blood cell actually takes about 20-60 seconds to complete one full circulation through the body, not one minute. The heart pumps approximately 5 liters of blood per minute, and each red blood cell makes thousands of trips through the circulatory system in its 120-day lifespan. The one-minute estimate is close but not precise enough.

The cornea is indeed avascular (has no blood vessels), making it the only part of the human body without a direct blood supply. It receives oxygen directly from the air and gets nutrients from tears and the aqueous humor (fluid inside the eye). This transparency is essential for vision - blood vessels would scatter light and impair vision.