All Free Everyday Science MCQs with Answers

1661. As you go down into a well, your weight__________?

• A. Slightly increases
• B. Slightly decreases
• C. Remains the same
• D. None of these

Explanation: Weight decreases slightly below Earth's surface because only the mass lying above the object contributes no net inward gravitational pull, reducing the effective gravitational field. This differs from moving upward, where weight also decreases because the distance from Earth's centre increases.

1662. Speed of object in one direction is called___?

• A. Velocity
• B. Acceleration
• C. Space
• D. Temperature

Explanation: Velocity is speed together with a specified direction, whereas speed alone has magnitude but no direction. Acceleration means the rate of change of velocity.

1663. The Doppler's effect is applicable for_________?

• A. light waves only
• B. sound waves only
• C. Both Light waves and sound ways
• D. None of these

Explanation: The Doppler effect occurs when relative motion changes the observed frequency of a wave. It applies to sound and electromagnetic waves such as light, although light requires a relativistic treatment at very high speeds.

1664. SONAR is based on the principle of___________?

• A. Echo
• B. reverberation
• C. resonance
• D. None of these

Explanation: SONAR sends ultrasonic waves into water and detects the returning reflection, or echo, to determine distance or locate objects. Reverberation is the persistence of sound caused by repeated reflections, not the basic operating principle of SONAR.

1665. Nuclear sizes are expressed in a unit named ?

• A. Tesla
• B. Force
• C. Fermi
• D. Newton

Explanation: Nuclear dimensions are commonly expressed in femtometres, historically called fermis, where 1 fermi equals 10⁻¹⁵ metre. Tesla measures magnetic field, while newton measures force.

1666. Which types of waves are used in a night vision apparatus ?

• A. Radio Waves
• B. Micro Waves
• C. Infrared Waves
• D. Magnetic waves

Explanation: Night vision devices detect infrared radiation emitted or reflected by objects, often converting it into a visible image. Radio and microwave waves are not the usual radiation used for ordinary night vision.

1667. SI unit of light is _________ ?

• A. watt
• B. Pascal
• C. Candela
• D. Joule

Explanation: Candela is the SI base unit of luminous intensity, the measurement usually intended by the phrase “intensity of light.” Lumen measures luminous flux, while watt measures power.

1668. The side view mirrors of vehicles are of which type of mirrors?

• A. Convex
• B. Concave
• C. Plane
• D. Inverted

Explanation: Convex mirrors provide a wide field of view and form upright, diminished images, allowing drivers to see more traffic behind them. Concave mirrors have a narrower field and can magnify nearby objects.

1669. Farad is the unit of___________?

• A. inductance
• B. voltage
• C. capacitance
• D. None of these

Explanation: The farad measures capacitance, which is the ability of a component to store electric charge. Inductance is measured in henries, while voltage is measured in volts.

1670. One Gross is equal to___________?

• A. 5 Dozen
• B. 10 Dozen
• C. 12 Dozen
• D. None of them

Explanation: A gross contains 144 items, and a dozen contains 12, so one gross equals 12 dozen. This is a counting unit rather than a measure of physical quantity such as mass or length.