According to science, the Earth is _______ years old.
- (A) 10 billion
- (B) 4.5 million
- (C) 4.5 billion
- (D) 450 million
- (C) 4.5 billion
Science estimates the age of the Earth to be approximately 4.54 billion years, with a small margin of error of 1%. This estimate has been arrived at through radiometric dating of the oldest rocks, samples of the Moon, and meteorites, all of which indicate that the Earth and the solar system coexisted approximately that long ago.
Three Gorges Dam is located in:
- (A) USA
- (B) India
- (C) China
- (D) Canada
- (C) China
The Three Gorges Dam is located on the Yangtze River in Sandouping, Yiling District, Yichang, Hubei Province, China. In central China, it is just upstream of Yichang and close to the Chongqing municipality. This is the world’s largest hydroelectric power project.
Cirrhosis is a disease that affects which organ of human body?
- (A) Liver
- (B) Kidney
- (C) Pancreas
- (D) Small Intestine
- (A) Liver
Cirrhosis is a chronic liver disease. It is caused by the replacement of healthy liver tissue with scar tissue, so the liver becomes scarred and hard, losing its function over time. The usual causes include long-term use of alcohol, hepatitis B or hepatitis C, and non-alcoholic fatty liver disease.
Depletion of the ozone layer is caused due to:
- (A) Ferrocene
- (B) Fullerene
- (C) Freon
- (D) Poly-halogen
- (C) Freon
The depletion of the ozone layer is usually caused by chlorofluorocarbons (CFCs), which are commonly known by the brand name Freon. When Freon molecules are released into the atmosphere, they will eventually reach the stratosphere. In this region, high-energy UV rays will break them down and release chlorine atoms. A single chlorine atom has the ability to destroy up to 100,000 ozone molecules by converting them to oxygen. This leads to the thinning of the ozone layer, creating holes that allow UV rays to penetrate to the earth’s surface.
The milk needs to be heated for complete pasteurization at 161°F for:
- (A) 25 seconds
- (B) 15 seconds
- (C) 20 seconds
- (D) 30 seconds
- (B) 15 seconds
In the High-Temperature Short-Time pasteurization, the milk has to be at least 161°F (72°C) for a minimum of 15 seconds. This form of pasteurization, also called flash pasteurization, seeks to eliminate disease-causing pathogens without affecting the nutrient and taste content of the milk. In home pasteurization, the milk should be held at the temperature of 161°F for as long as 30 seconds before rapidly cooling it to 40°F (4°C) or below.
Complete the sequence: 6, 11, _______, 27.
- (A) 16
- (B) 17
- (C) 18
- (D) 19
- (C) 18
Differences increase by 2:
- 6 → 11 = +5
- 11 → 18 = +7
- 18 → 27 = +9
Answer: 18
Vitamin that is not found in fruits and vegetables but produced by body itself:
- (A) Vitamin B1
- (B) Vitamin B12
- (C) Vitamin B6
- (D) Vitamin A
- (B) Vitamin B12
Vitamin B12 (cobalamin) is unique because it is naturally found only in animal products (meat, eggs, and dairy) and is not present in fruits or vegetables unless they are fortified.
Deforestation at large scale can be observed at:
- (A) Atlantic forest
- (B) Amazon forest
- (C) Borneo forest
- (D) Sumatra forest
- (B) Amazon forest
The Amazon rainforest is the biggest tropical forest on the planet, and it is also the site where the most widespread deforestation on a large scale is happening. The cause of the loss of trees in the Amazon rainforest is mainly due to cattle ranching, which causes four out of five instances of deforestation, and also due to large-scale soybean farming and infrastructure projects like the Trans-Amazonian Highway. Even today, one out of five trees in this region is lost due to deforestation. Due to its large area, the extent of land cleared in this region every year is greater than that cleared in any other single forest area in the world.
The first Mechanical Calculating Machine was invented by:
- (A) William Oughtred
- (B) Gottfried W. Leibniz
- (C) Blaise Pascal
- (D) Charles Babbage
- (C) Blaise Pascal
The first mechanical calculator, although unknown, was invented by a German professor named Wilhelm Schickard in 1623. However, the first calculator that gained recognition and actually worked was Blaise Pascal’s Pascaline, designed between 1642 and 1644 for tax calculations.
Blank DVDs on which data can be erased and rewritten are identified by:
- (A) DVD + WR
- (B) DVD + RW
- (C) DVD + R
- (D) DVD + W
- (B) DVD + RW
DVD+RW and DVD-RW media fall under Rewritable media. These media use a phase-change recording layer that can be used to record, erase, and re-record data up to 100 to 1,000 times.