Tag: science & technology

Dobson's Encyclopedia (1789-1798) was the first encyclopedia published in the newly independent United States. It was essentially a reprint of the third edition of Britannica, adapted for American readers. The other options are either fabricated or incorrect.

Franklin D. Roosevelt was the first US President to appear on television, at the 1939 New York World's Fair opening. This was during a demonstration of TV technology. Kennedy and Johnson appeared later, and Reagan was not president until decades after TV became common.

The first ODI match was played between Australia and England at the Melbourne Cricket Ground on January 5, 1971. The match was played after a Test match was rained out, and it was a 40-over game per side. Australia won by 5 wickets. Italy, Brazil, and South Africa were not involved.

Children typically have higher resting heart rates than adults, ranging from 70-100 beats per minute. This elevated rate is normal due to their smaller heart size, higher metabolic rate, and faster cardiovascular development compared to adults.

120/80 mmHg is considered the standard normal blood pressure reading. The first number (systolic) represents pressure when the heart beats, while the second (diastolic) is pressure between beats. Readings consistently above 140/90 are considered hypertensive.

The normal resting heart rate for adults ranges from 60-100 beats per minute. Athletes may have lower resting rates (below 60), while rates consistently above 100 may indicate tachycardia. This range is established by medical standards for healthy adults at rest.

The average person blinks approximately 12-15 times per minute, though this can vary based on factors like concentration, screen use, and environmental conditions. Blinking helps moisten and clean the eyes, protecting them from irritation and dryness.

Adults typically have a resting pulse rate of 60-100 beats per minute. This is lower than children's rates because adults have larger, more efficient hearts that pump more blood with each beat. Well-conditioned athletes may have rates as low as 40-60 bpm.

Light Amplification by Stimulated Emission of Radiation is the correct expansion of LASER. The acronym describes the fundamental physics principle - stimulated emission produces coherent light that is then amplified. Absorption and Alteration are incorrect - the process is amplification, not absorption or change. Since a correct option exists, D is incorrect.

Methane is the correct answer. Coal gas (also called town gas) is produced by coal gasification and contains methane, hydrogen, carbon monoxide, and other gases, with methane being a major constituent. Oxygen and nitrogen are not primary components of coal gas, and water is not a constituent gas.