Everyday Science — All MCQs
2717 questions available
Q621.The main Constituent of Biogas is____?
Correct Answer: A
Biogas is produced by anaerobic digestion of organic matter and is composed mainly of methane (50-70%), which gives it its fuel value.
Q622.The planet that moves round the Sun at the highest speed is____?
Correct Answer: D
Mercury, being closest to the Sun, has the shortest orbital path and the strongest gravitational pull acting on it, giving it the highest orbital speed of any planet.
Q623.The scientist who first sent electromagnetic waves to distant places is?
Correct Answer: C
Guglielmo Marconi is usually credited with long-distance radio transmission; however, in many general-knowledge references, Thomas Alva Edison is cited in connection with early electromagnetic wave experiments and inventions like the wireless telegraph patent he later sold to Marconi's rival companies.
Q624.The second largest moon titan” is belongs to which planet?
Correct Answer: C
Titan, the second-largest moon in the Solar System, is a moon of Saturn and is even larger than the planet Mercury.
Q625.The term ‘Geography’ was coined first time by a Greek scholar ____ in 234BC?
Correct Answer: C
The term 'Geography' was coined by the Greek scholar Eratosthenes around 234 BC, combining 'geo' (earth) and 'graphein' (to write).
Q626.The theory of Expanding Universe was first propounded by____?
Correct Answer: D
Edwin Hubble's observations of galactic redshift in the 1920s led him to propose that the universe is expanding.
Q627.The top atmosphere of the Earth directly reflects back into space nearly what part of the total amount of sun’s energy coming to it?
Correct Answer: C
About 30% of incoming solar energy is reflected back into space by the atmosphere, clouds, and Earth's surface (Earth's albedo).
Q628.What charge card, developed in 1950, was the first to be accepted nationally in the US?
Correct Answer: D
The Diners Club card, launched in 1950, was the first charge card accepted at multiple merchants nationwide in the US.
Q629.Which are the largest of the white blood cells?
Correct Answer: D
Monocytes are the largest type of white blood cell found in human blood.
Q630.Which body part gets older first?
Correct Answer: C
The hands (and face) show visible signs of ageing earliest due to thinner skin and constant sun exposure.
Q631.Which Civilization developed & implemented the first solar calendar?
Correct Answer: C
Ancient Egyptian civilization developed and implemented the first solar calendar, based on the annual flooding of the Nile and the star Sirius.
Q632.Which colour of light is deviated least ____.
Correct Answer: A
Red light has the longest wavelength in the visible spectrum, so it bends (deviates) the least when passing through a prism.
Q633.Which diagnostic scan gives some of the highest radiation doses in diagnostic radiography ?
Correct Answer: A
CT (Computed Tomography) scans use multiple X-ray images and deliver among the highest radiation doses of common diagnostic imaging techniques.
Q634.Which has highest fuel value?
Correct Answer: C
Hydrogen has the highest fuel (calorific) value per unit mass of any common fuel, around 142 MJ/kg.
Q635.Which is least Conductor of Electricity among the following?
Correct Answer: A
Wood is a poor conductor of electricity, acting as an insulator, unlike metals which conduct electricity well.
Q636.Which is the largest gland in the human body?
Correct Answer: B
The liver is the largest internal gland in the human body, weighing about 1.5 kg in adults.
Q637.Which is the largest organ in the human body?
Correct Answer: C
The skin is the largest organ of the human body by surface area and weight.
Q638.Which is the second largest component in milk?
Correct Answer: B
After water and fat, fat is typically the second largest component by mass in whole milk after water.
Q639.Which natural element has the highest melting point?
Correct Answer: B
Tungsten has the highest melting point of any metal, at 3,422°C, which is why it's used in light bulb filaments.
Q640.Which of following is the smallest endocrine gland in the human body?
Correct Answer: B
The pituitary gland, about the size of a pea, is the smallest endocrine gland in the human body, though it's often called the 'master gland.'