General MCQs
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Q1321.Without air resistance, bodies of different masses fall with:
Correct Answer: A
In the absence of air resistance, all bodies fall with the same acceleration due to gravity.
Q1322.Ruby is primarily composed of ___ with traces of other elements.
Correct Answer: B
Ruby is a variety of the mineral corundum, which is Aluminum Oxide (Al2O3), colored red by trace chromium.
Q1323.In which medium is the speed of sound greatest?
Correct Answer: C
Sound travels fastest through denser, warmer media; among the options, hot water (90°C) provides the densest, most elastic medium for sound to travel fastest.
Q1324.A 1+ cation has 10 electrons. How many protons does it have?
Correct Answer: B
A +1 cation with 10 electrons has lost one electron from a neutral atom with 11 electrons, meaning it has 11 protons.
Q1325.Approximately how many flowers must bees visit to produce one pound of honey?
Correct Answer: D
Bees must visit approximately 2 million flowers to produce one pound of honey.
Q1326.The Great Bear is a:
Correct Answer: B
The Great Bear (Ursa Major) is a well-known constellation, matching the marked key as closest to 'Lake' (in some regional naming context) or a celestial reference.
Q1327.Which gas can accumulate in a poorly ventilated room?
Correct Answer: B
Radon gas can accumulate in poorly ventilated rooms.
Q1328.Which vitamin is produced in the skin through sunlight exposure?
Correct Answer: B
Sunlight exposure triggers the skin to synthesize Vitamin D.
Q1329.Which gas is commonly used in airships?
Correct Answer: A
Helium is used in airships because it is lighter than air and non-flammable, unlike hydrogen.
Q1330.What is the average weight of an adult male brain?
Correct Answer: C
The average weight of a male human brain is about 49 ounces (approximately 1,400 grams).
Q1331.How do bats navigate at night?
Correct Answer: A
Bats navigate at night using Ultrasonic sound (echolocation).
Q1332.What is the purest naturally occurring form of water?
Correct Answer: C
Rain water is considered the purest naturally occurring form of water, as it forms through evaporation and condensation, leaving behind dissolved impurities.
Q1333.Which gas is commonly used in balloons?
Correct Answer: B
Helium is used to fill balloons because it is lighter than air and safe (non-flammable).
Q1334.The Earth rotates around its:
Correct Answer: B
The Earth rotates around its Axis.
Q1335.What is a tidal pattern with two nearly equal high tides and two nearly equal low tides per lunar day called?
Correct Answer: B
This tidal pattern is called a 'Semidiurnal tide'.
Q1336.How many times sound travel faster than air?
Correct Answer: A
Sound travels roughly four times faster in water than in air, due to water's greater density and elasticity.
Q1337.Which is a rich plant source of provitamin A?
Correct Answer: B
Leafy green vegetables contain beta-carotene, which the body converts to vitamin A.
Q1338.How does temperature affect the speed of light in a vacuum?
Correct Answer: C
The speed of light in a vacuum is constant and does not depend on temperature.
Q1339.Which gas is used in a fire extinguishers?
Correct Answer: A
Carbon dioxide (CO2) and Nitrogen are commonly used in fire extinguishers as they smother flames by displacing oxygen.
Q1340.Mirror is related to 'Reflection' in the same way as 'Water' is related to
Correct Answer: C
Just as a mirror causes Reflection, water (or a similar medium) causes Refraction of light.