Science Quiz Class 10

Explanation
Vitamin B complex consists of 8 vitamins namely B1, B2, B3, B5, B6, B7, B9 and B12. Vitamin B1 is Thiamine, Vit B2 is Riboflavin, Vit B3 is Niacin, Vit B5 is pantothenic acid, Vit B6 is pyridoxine, biotin, folic acid and Vit B12 is cyanocobalamin.

Explanation
Statement 1 is correct as the first case of Coronavirus was indeed reported from China. Statement 2 is correct as Coronavirus is officially known as 'COVID-19'. However, statement 3 is incorrect as Coronavirus can spread from human to animal, as seen in cases of transmission to pets such as cats and dogs.

Explanation
With a lift off weight of 40 tonnes, the 24 m tall ASLV was configured as a five stage, all-solid propellant vehicle, with a mission of orbiting 150 kg class satellites into 400 km circular orbits.

Explanation
The most abundant element in the universe is hydrogen, which makes up about three-quarters of all matter! Helium makes up most of the remaining 25%. Oxygen is the third-most abundant element in the universe. All of the other elements are relatively rare.

Explanation
The thyroid gland uses iodine from the food to make two main hormones: Triiodothyronine (T3) and Thyroxine (T4).

Explanation
Ethyl Acetate is a colorless liquid with a fragrant, fruity odor. It is used as a solvent, a synthetic flavoring substance, and in making perfumes and dyes.
HAZARD SUMMARY
* Ethyl Acetate can affect you when breathed in and by passing through your skin.
* Ethyl Acetate can irritate the skin, eyes, nose and throat.
* Exposure to high levels can cause you to feel dizzy, lightheaded, and to pass out.
* Repeated contact can cause drying and cracking of the skin.
* Long-term exposure can affect the liver and kidneys.
* Ethyl Acetate is a FLAMMABLE LIQUID and a FIRE HAZARD.

Explanation
The main organic acids contained in the flesh of lemons are citric acid and malic acid. The sourness of citrus fruit is the taste of citric acid.

Explanation
In conductive materials, the outer electrons in each atom can easily come or go and are called free electrons. In insulating materials, the outer electrons are not so free to move. ... Dynamic electricity, or electric current, is the uniform motion of electrons through a conductor.

Explanation
A galvanometer is an electro mechanical instrument for detecting and measuring electric current. The most common use of galvanometers was as analog measuring instruments, called ammeters, used to measure the direct current (flow of electric charge) through an electric circuit.

Explanation
Salivary amylase is an enzyme in the mouth that initiates the digestion of carbohydrates in the form of starches by catalyzing the hydrolysis of polysaccharides into disaccharides. However, the main site for carbohydrate digestion is the small intestine.
Salivary amylase breaks down starch in humans at optimum pH of 6.7.