All Free Everyday Science MCQs with Answers

1771. Which stone floats on water?

• A. Pumice stone
• B. Lime stone
• C. Basalt stone
• D. Quartzite stone

Explanation: Pumice contains many trapped air spaces, making its average density lower than that of water, so it can float. The other listed rocks are generally denser than water.

1772. The scientific study of measurement is known as __________?

• A. Entomology
• B. Metrology
• C. Ichthyology
• D. Ecology

Explanation: Metrology is the science of measurement, covering units, standards, calibration and measurement accuracy. The other terms name biological or environmental fields.

1773. How many meters are in one mile?

• A. How many meters in one mile?
• B. 1409.34
• C. 1509.34
• D. 1609.34
• E. None of Above

Explanation: One international mile equals exactly 1,609.344 metres, commonly rounded to 1,609.34 metres. Option a repeats the question instead of giving a measurement.

1774. kilohertz (kHz) is a unit which measures?

• A. Power used by a current of one ampere
• B. Electromagnetic radio wave frequencies
• C. Voltage
• D. Electric resistance

Explanation: A kilohertz equals 1,000 hertz and measures frequency, including the frequency of electromagnetic radio waves. Voltage, resistance and power use volts, ohms and watts respectively.

1775. One Joule is equal to__________?

• A. 105 ergs
• B. 103 ergs
• C. 107 ergs
• D. 1011 ergs

Explanation: One joule equals one kilogram metre squared per second squared, while one erg is the CGS equivalent of 10⁻⁷ joule. Hence, 1 joule equals 10⁷ ergs.

1776. 'Bar' is the unit of___________?

• A. Temperature
• B. Heat
• C. Atmospheric pressure
• D. Current

Explanation: The bar is a unit of pressure, commonly used for atmospheric and gas pressure; 1 bar is close to normal atmospheric pressure. Temperature, heat and electric current use different units.

1777. How many Dynes are there in one gram weight?

• A. 993
• B. 981
• C. 250
• D. 375

Explanation: In the CGS system, the weight of a 1-gram mass is its mass multiplied by gravitational acceleration, about 981 cm/s². Thus, one gram-weight is approximately 981 dynes.

1778. The melting point of ice is_________?

• A. 00C
• B. 1000C
• C. 40C
• D. -40C

Explanation: At standard atmospheric pressure, ice melts at 0°C, the point at which solid and liquid water coexist. The value can vary slightly with pressure and impurities.

1779. Density of Ice is_________?

• A. 800kg/m3
• B. 917kg/m3
• C. 930kg/m3
• D. 1000kg/m3Biological Sciences

Explanation: Ice has a density of about 917 kg/m³, which is less than liquid water's roughly 1000 kg/m³. This lower density is why ice floats.

1780. The Mirror used in the Automobiles are___________?

• A. Concave
• B. Convex
• C. Plains
• D. Reflective

Explanation: Automobile rear-view and side-view mirrors are convex, so they provide a wider field of view. They form upright, diminished images, helping drivers see more traffic behind them.