All Free Everyday Science MCQs with Answers

551. The horizontal rows of the periodic table are called ______?

• A. Groups
• B. Periods
• C. Sets
• D. Matrices

Explanation: The horizontal rows of the periodic table are called periods, and the vertical columns are called groups. Elements in the same period have the same number of occupied electron shells.

552. Which metallic element is liquid at room temperature?

• A. Zinc
• B. Nickel
• C. Lead
• D. Mercury

Explanation: Mercury is a metal that remains liquid at ordinary room temperature because its melting point is about −39°C. Zinc, nickel, and lead are solid at room temperature.

553. Lactometer is used for__________?

• A. Ship
• B. Milk
• C. Honey
• D. None

Explanation: A lactometer measures the specific gravity of milk, helping assess its density and possible dilution. It is a form of hydrometer designed for milk testing.

554. Glucose syrup is made from__________?

• A. oat
• B. wheat
• C. maize
• D. rice

Explanation: Commercial glucose syrup is commonly produced by breaking down maize starch with enzymes or acids. This is why maize, also called corn, is the standard answer.

555. The variety of coal in which the deposit contains recognizable traces of the original plant material is____________?

• A. bitumen
• B. anthracite
• C. lignite
• D. peat

Explanation: Peat is the earliest coal-forming material and still contains recognizable partly decomposed plant remains. Lignite, bituminous coal and anthracite are progressively more altered and carbon-rich forms.

556. Bromine is a___________________?

• A. black solid
• B. red-brown liquid
• C. colourless gas
• D. highly inflammable gas

Explanation: Bromine is a volatile red-brown liquid at room temperature and is one of the few elements that is liquid under ordinary conditions. It is not a colourless or highly inflammable gas.

557. Hydrogen peroxide (H2O2)______________?

• A. helps line up cell proteins
• B. is poisonous to tissues
• C. is often needed as a catalyst
• D. aids in oxidation of glucose

Explanation: Hydrogen peroxide can damage living tissues because it is a reactive oxidizing substance, although dilute solutions are used as disinfectants. Its toxicity increases with concentration and exposure.

558. Magnalium is an alloy of_____________?

• A. Magnesium and Lead
• B. Aluminium and Zinc
• C. Aluminium and Magnesium
• D. Aluminium and Mercury

Explanation: Magnalium is an alloy made mainly from aluminium and magnesium. Its name combines “magnesium” and “aluminium,” which helps distinguish it from aluminium-zinc alloys.

559. An element that does not occur in nature but can be produced artificially is__________?

• A. Plutonium
• B. Uranium
• C. Radium
• D. Thorium

Explanation: Plutonium is chiefly produced artificially by neutron irradiation of uranium in nuclear reactors. Uranium, thorium and radium occur naturally, although radium is present only in very small amounts.

560. The ratio of pure gold in 18 carat gold is _______________?

• A. 0.5
• B. 0.9
• C. 0.8.5
• D. 0.75

Explanation: The carat value gives parts of pure gold out of 24, so 18-carat gold contains 18/24, or 0.75, pure gold. The remaining 25% consists of other metals added to increase hardness.