All Free Everyday Science MCQs with Answers

771. A crescograph is a device for measuring the growth in __________?

• A. Micro Organism
• B. Plants
• C. Human
• D. Pollution

Explanation: A crescograph is a sensitive instrument used to measure and record very small increases in plant growth. It can detect movements that are too slow or slight to observe directly.

772. ______ soil is also called Regur soil?

• A. Desert
• B. Mountain
• C. Black
• D. Alluvial

Explanation: Regur soil is the traditional name for black soil, a clay-rich soil especially associated with cotton cultivation in parts of the Indian subcontinent. Its dark colour and moisture-retaining property distinguish it from alluvial and desert soils.

773. Which of the following noble gases is abundant in air?

• A. Neon
• B. Helium
• C. Argon
• D. Methane

Explanation: Argon is the most abundant noble gas in Earth’s atmosphere, making up about 0.93% of dry air. Neon and helium occur only in very small amounts, while methane is not a noble gas.

774. Bubo bubo is the scientific name of which of the following species?

• A. Hen
• B. Peacock
• C. Eagle
• D. Owl

Explanation: Bubo bubo is the scientific name of the Eurasian eagle-owl, one of the world’s largest owl species. The repeated genus and species names identify a biological species rather than a general bird group.

775. Which of the following flower is called Queen of Water?

• A. Rose
• B. Lilly
• C. Rafflesia
• D. Tulip

Explanation: The water lily is commonly called the Queen of Water because it grows and blooms on the surface of ponds and lakes. Rose, tulip, and Rafflesia are not aquatic water lilies.

776. What is the largest flower in the world?

• A. Conifer
• B. Fern
• C. Rafflesia
• D. Horsetail

Explanation: Rafflesia produces the largest individual flower, with some species growing close to a metre across. Conifers, ferns, and horsetails are plant groups rather than the answer to this flower-size question.

777. How many latitude lines are there?

• A. 90
• B. 180
• C. 270
• D. 360

Explanation: In the standard geographic convention, latitude is measured from 0° at the Equator to 90° north and 90° south, giving 180 degrees of latitude. Strictly speaking, infinitely many parallel lines can be drawn between these degree marks, so the question uses “lines” loosely.

778. Who is the known as the father of taxonomy?

• A. Aristotle
• B. Fransco Redi
• C. Carolus Linnaeus
• D. Rachel Carson

Explanation: Carolus Linnaeus is called the father of taxonomy because he established the widely used hierarchical classification system and binomial naming method. Aristotle made early classifications, but Linnaeus formalised modern taxonomy.

779. There is a hole in the Ozone Layer at__________?

• A. South Pole
• B. North Pole
• C. Both A and B
• D. None of These

Explanation: The famous seasonal ozone hole forms mainly over Antarctica around the South Pole because the cold polar stratosphere enables chlorine- and bromine-driven ozone destruction. Ozone depletion can also occur in the Arctic, but the large recurring “ozone hole” conventionally refers to Antarctica.

780. Dinosaurs and many other species were extinct about ________ years ago.

• A. 55 million
• B. 66 million
• C. 75 million
• D. 85 million

Explanation: The non-avian dinosaurs disappeared in the end-Cretaceous mass extinction about 66 million years ago. The event is commonly linked to the Chicxulub asteroid impact along with major environmental changes.