Everyday Science — All MCQs
2717 questions available
Q641.Which of the following is called smallest, shallowest and coldest ocean of the world?
Correct Answer: C
The Arctic Ocean is the smallest, shallowest, and coldest of the world's five oceans.
Q642.Which of the following is responsible for largest amount of oxygen on earth?
Correct Answer: B
Marine algae (phytoplankton) produce a large share of the world's oxygen through photosynthesis, often cited as more than land plants combined.
Q643.Which of the following is the largest gland of the Human body ____?
Correct Answer: B
The liver is the largest gland in the human body.
Q644.Which of the following is the largest planet?
Correct Answer: B
Jupiter is the largest planet in the Solar System by both mass and volume.
Q645.Which of the following ocean is the least polluted ocean of the world?
Correct Answer: C
The South Pacific Ocean, being far from major industrial and shipping routes, is considered the least polluted ocean.
Q646.Which of the following planets has the smallest diameters____?
Correct Answer: A
Mercury has the smallest diameter of any planet in the Solar System.
Q647.Which of the following was first to be discovered in the chromospheres of the sun?
Correct Answer: D
Helium was first discovered in the Sun's chromosphere in 1868 through spectral analysis, before being found on Earth.
Q648.Which of the following waves have smallest velocity in vacuum?
Correct Answer: B
Sound waves cannot travel through a vacuum at all (they need a medium), so among the choices given they are considered to have the least/no velocity in vacuum.
Q649.Which of the followong spacecrsft enabled man to step on the moon first?
Correct Answer: D
Apollo 11 was the spacecraft mission that first landed humans (Neil Armstrong and Buzz Aldrin) on the Moon in 1969.
Q650.Which one is the world’s largest mangrove forest(s)?
Correct Answer: C
The Sundarbans, spanning Bangladesh and India, is the world's largest mangrove forest.
Q651.Which one of the following clouds is found at the highest level in the atmospher?
Correct Answer: D
Cirrus clouds form at the highest altitudes in the atmosphere, typically above 6,000 metres, made of ice crystals.
Q652.Which water will freeze first?
Correct Answer: A
Hot water can freeze faster than cold water under certain conditions, a phenomenon known as the Mpemba effect.
Q653.Who first discovered how blood circulates in the human body?
Correct Answer: C
William Harvey, an English physician, was the first to accurately describe the circulation of blood pumped by the heart, in 1628.
Q654.Who first measured the velocity of light?
Correct Answer: C
Danish astronomer Ole Rømer was the first to measure the speed of light, in 1676, using observations of Jupiter's moons.
Q655.Who invented the first battery?
Correct Answer: A
Alessandro Volta invented the first true battery, the voltaic pile, in 1800.
Q656.Who is the inventor of the first magnetic resonance imaging (MRI) machine?
Correct Answer: C
Raymond Damadian is credited with inventing the first MRI (Magnetic Resonance Imaging) scanning machine.
Q657.Who was the first to measure the earth’s circumference?
Correct Answer: A
Eratosthenes, a Greek scholar, was the first to accurately measure the Earth's circumference around 240 BC using shadow angles.
Q658.Who was the first to measure the earth’s radius
Correct Answer: D
Eratosthenes was also the first to calculate the Earth's radius, deriving it from his circumference measurement.
Q659.1 Coulomb = ____ e.
Correct Answer: B
One Coulomb of charge is equal to approximately 6.25×10^18 elementary charges (electrons).
Q660.1 light year = ?
Correct Answer: C
A light year, the distance light travels in one year, is approximately 9.5×10^12 km (9.5 trillion km).