science & technology Online Quiz - 550

To solve this question, the user needs to have knowledge of our solar system and the number of planets in it.

Option A: This option is incorrect because there are only 8 planets in our solar system, not 11.

Option B: This option is correct. There are 9 planets in our solar system, including Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and the dwarf planet Pluto. However, in 2006, the International Astronomical Union (IAU) redefined the criteria for what constitutes a planet, and reclassified Pluto as a "dwarf planet." Therefore, there are currently only 8 planets in our solar system.

Option C: This option is incorrect because there are 8 planets in our solar system, not 11 or 8.

Option D: This option is incorrect because there are only 8 planets in our solar system, not 10.

The Answer is: C.

To answer this question, the user needs to know the origin of the name "Bluetooth".

Option A, Blue Whale, is incorrect. The name Bluetooth is not derived from a blue whale.

Option B, Harald Blatand, is correct. Bluetooth technology is named after Harald Blatand, who was a 10th-century king in Denmark. Blatand means "Bluetooth" in English, and he was known for his ability to unite different tribes and nations, just as Bluetooth technology allows different devices to communicate with each other.

Option C, Harold Bleacher, is incorrect. The name Bluetooth does not have anything to do with Harold Bleacher.

Option D, Bluetooth, is incorrect. Bluetooth technology is not named after itself.

Therefore, the answer is: B. Harald Blatand.

Oil of Vitriol is the historical common name for sulphuric acid (H2SO4). The name comes from the vitriol (sulfate) minerals used to produce it. Hydrochloric acid is muriatic acid, carbolic acid is phenol, and acetic acid is found in vinegar.

The capybara is the world's largest living rodent, native to South America. Adults can weigh up to 66 kg (146 lb). Wild boars are ungulates, not rodents. Guinea pigs are much smaller rodents. Meerkats are mongooses, not rodents.

Silver nitrate (AgNO3) is historically called Lunar Caustic because silver was associated with the moon (luna). It was used as a caustic agent for cautery. The other options are not recognized common names for silver nitrate.

Gunpowder is traditionally composed of sulfur, charcoal, and potassium nitrate (saltpeter). Potassium nitrate is the oxidizing agent. Silver nitrate, sodium nitrate, and calcium nitrate are not components of traditional gunpowder.

To answer this question, the user needs to know about the components of milk protein.

The correct answer is:

B. Casein

Explanation:

Milk protein is made up of two main types of protein: casein and whey protein. Casein is the most abundant protein in milk, making up about 80% of the protein content. It is a slow-digesting protein that is often used in protein supplements. Milkein, Malkein, and Kazien are not correct names for milk protein.

Methyl salicylate is an organic ester commonly known as oil of wintergreen. It produces the characteristic mint-like smell found in many pain relief products like Vicks and Tiger Balm. The name comes from the wintergreen plant from which it was originally extracted.

To solve this question, the user needs to have knowledge about different snake species and their reproductive behavior.

The snake species that nest and lay eggs and guard them until they hatch are called oviparous. The correct answer to this question is:

The Answer is: D. King Kobra

Explanation:

Out of the given options, King Kobra is the only oviparous snake species. The female King Kobra lays eggs in a nest made up of leaves and other debris, and she stays with the eggs, protecting them until they hatch. The incubation period for the eggs is around 60 days. In contrast, Black Mamba, Russel's Viper, and Gaboon Viper are all viviparous, which means they give birth to live young ones instead of laying eggs.

To answer this question, the user needs to have some knowledge about environmental conservation and the purpose of various books.

Option A is incorrect because the Red Data Book is not related to drought-hit places.

Option B is correct. The Red Data Book is a compilation of the world's endangered species of animals, plants, and fungi. It is a comprehensive list of threatened species with the aim of protecting them from extinction.

Option C is incorrect because the Red Data Book is not related to the hottest places on earth.

Option D is incorrect because the Red Data Book is not related to earthquake-prone areas on earth.

Therefore, the correct answer is:

The Answer is: B. Book showing list of animals, plants and fungi which are under the threat of extinction.

The chemical symbol W comes from 'Wolfram', the old German name for Tungsten. Wolframite ore was historically the primary source of Tungsten, leading to the W symbol.

Oology is the branch of zoology that specializes in the study of eggs, especially bird eggs. The term comes from the Greek word 'oon' meaning egg. Herpetology studies reptiles, ichthyology studies fish, ornithology studies birds.

The Wandering Albatross has the largest wingspan of any living bird, typically reaching up to 3.7 meters. Flamingos and Bald Eagles have significantly smaller spans, and the Ostrich, while the largest bird, is flightless and has relatively small wings.

Earth's atmosphere is composed of approximately 78% Nitrogen (N2) and 21% Oxygen (O2). Carbon dioxide and water vapor exist only in much smaller, trace amounts.

Using the formula frequency = speed of light / wavelength (f = c / λ), where c is approximately 300,000,000 m/s and λ is 1 m, the frequency is 300,000,000 Hz.

Bronze is primarily an alloy of copper and tin, typically with about 88% copper and 12% tin. While other elements like zinc, phosphorus, or aluminum may be added, copper and tin remain the core components.

The University of Manchester's Transistor Computer, which first became operational in 1953, is widely recognized as the first functional transistorized computer, predating commercial models like the TRADIC.

Air conditioning works via a refrigeration cycle where a refrigerant constantly changes state. It absorbs heat by evaporating into a gas and releases heat by condensing back into a liquid.

In a steam engine, the boiler is the component where water is heated and converted into steam. The boiler must be carefully designed with pressure relief valves to prevent dangerous pressure buildup. A griller is for cooking, a steamer is for cooking with steam, and an evaporator removes liquid from a solution in various industrial processes.

To solve this question, the user needs to know about the escape velocity of an object. Escape velocity is the minimum speed required for an object to overcome the gravitational pull of a celestial body and escape into space.

Now, let's go through each option and explain why it is right or wrong:

A. 550 m/s: This option is not correct. This velocity is too low for an object to escape Earth's gravitational pull. It is not sufficient to overcome the gravitational attraction of the Earth.

B. 5.5 km/s: This option is not correct. Although this velocity is faster than option A, it is still too low for an object to escape Earth's gravity. It is only the speed required to reach low Earth orbit.

C. 11 km/s: This option is correct. This is the minimum speed required for an object to escape Earth's gravitational pull. When an object reaches this velocity, it has enough kinetic energy to break free of the Earth's gravity.

D. 110 km/s: This option is not correct. This velocity is much higher than the escape velocity required to escape Earth's gravity. It is not necessary to reach such a high velocity to escape Earth's gravity.

Therefore, The Answer is: C

The RGB color model is used in electronic displays like CRT and LCD monitors. It utilizes Red, Green, and Blue as primary colors which are combined in various intensities to create a full spectrum of colors.

To solve this question, the user needs to know the definition of the speed of light.

The speed of light is defined as the distance light travels in a vacuum per unit of time.

Now, let's go through each option and explain why it is right or wrong:

A. 300,000 Mt/Sec: This option is incorrect because "Mt" is not a standard unit of measurement for speed. Also, the correct value of the speed of light is 299,792.458 km/s, which is not equal to 300,000 Mt/Sec.

B. 30000 Km/Sec: This option is incorrect because the actual value of the speed of light is much greater than 30,000 km/s. The correct value is around 299,792.458 km/s.

C. 300,000 Km/Sec: This option is correct. The speed of light in a vacuum is approximately 299,792.458 km/s, which is rounded up to 300,000 km/s for convenience.

D. None of the above: This option is incorrect because Option C is the correct answer.

Therefore, the Answer is: C. 300,000 Km/Sec

The mass-energy equivalence formula E=mc^2 was developed by Albert Einstein as part of his theory of special relativity in 1905. Newton is known for laws of motion, and Archimedes for buoyancy.

A convex lens is always thicker at the center than at the edges and converges light rays. The three types of convex lenses are biconvex (both surfaces convex), planoconvex (one flat, one convex), and positive meniscus (one convex, one concave but still converging). A negative meniscus lens is thinner at the center and is a diverging (concave) lens, not convex.

Sound travels faster in humid air because water vapor is less dense than dry air, and sound speed increases as the density of the medium decreases (at constant pressure). Rainy seasons have higher humidity, facilitating faster travel.

Roads are actually tilted (banked) towards the center of the curve to provide the necessary centripetal force for vehicles to turn safely at higher speeds. Therefore, the statement that they should not be tilted is false.

The African Wild Dog (Lycaon pictus) is frequently called the 'Painted Dog' or 'Painted Wolf' due to its unique, irregular coat pattern of yellow, black, and white fur.

To solve this question, the user needs to have knowledge of marine biology.

Now, let's go through each option and explain why it is right or wrong:

A. Killer Whale: Killer whales are not fish. They are actually the largest member of the dolphin family.

B. Great White Shark: Great white sharks are also not the largest fish in the world. They are one of the most well-known shark species but are not the largest.

C. Blue Whale: Blue whales are the largest animals on earth but they are not fish. They are mammals.

D. Whale Shark: This option is correct. Whale sharks are the largest fish in the world, growing up to 40 feet (12 meters) in length and weighing up to 47,000 pounds (21,500 kg). They are filter feeders and feed mainly on plankton.

The Answer is: D

The Gaboon Viper has the longest fangs of any snake species, reaching up to 5 cm (2 inches). King Cobras are famous for their venom but not fang length. Anacondas are constrictors with no significant fangs. Rattlesnakes have notable fangs but not the longest.

Ocimum sanctum (also known as Ocimum tenuiflorum) is the scientific name for Holy Basil, commonly known as Tulsi in India. It is highly revered in Hinduism for religious and medicinal purposes.

Periplaneta americana is the scientific name for the American cockroach. It is one of the largest species of common cockroaches and is a well-known household pest.

Peepal tree (Sacred Fig) is scientifically known as Ficus religiosa. Ficus bengalensis is the Banyan tree, Ficus carica is the common fig, and Ficus infectoria is a different Ficus species.

Pavo cristatus is the scientific name for the Indian Peafowl (peacock). It is the national bird of India. Ostrich is Struthio camelus.