Explanation

• Traditional walking sticks are commonly made of wood.
• Wood is strong and durable.

Last updated 13 August 2026 by NA

Explanation

• Oxygen reacts with most elements to produce binary compounds called oxides.
• An oxide is a compound formed when oxygen combines with another element.
• Oxides may be metallic or non-metallic depending on the element involved.
• Examples include CO₂ (carbon dioxide), MgO (magnesium oxide), and Fe₂O₃ (iron oxide).
• Oxides can have acidic, basic, or amphoteric properties.

Last verified on 12-08-2026

Explanation

• Water (H₂O) and carbon dioxide (CO₂) combine to form carbonic acid (H₂CO₃).
• The reaction is: CO₂ + H₂O ⇌ H₂CO₃.
• Carbonic acid is a weak acid.
• It forms naturally when CO₂ dissolves in water.
• Carbonic acid contributes to the slightly acidic nature of rainwater.

Last verified on 11-08-2026

Explanation

• First man who travelled in Space was Yuri Gagarin in 1961.
• Yuri Gagarin was a Soviet pilot and cosmonaut.
• He aboard the first successful crewed spaceflight, became the first human to journey into outer space.

Additional information:

• First man who Walk in Space was Alexei Leonov in 1965.
• First man who Walk on Moon was Neil Armstrong in 1969.

Last verified on 10-03-2026

Explanation

Very high frequency is the ITU designation for the range of radio frequency electromagnetic waves from 30 to 300 megahertz,

with corresponding wavelengths of ten to one meter.

ND17-7-2023

Explanation

• The pitch of a sound wave depends on its frequency.
• Pitch tells us whether a sound is high or low.
• Higher frequency → higher pitch (e.g., whistle).
• Lower frequency → lower pitch (e.g., bass drum).
• Frequency is measured in Hertz (Hz).

Last verified on 11-08-2026

Explanation

• The law of universal gravitation was proposed by Isaac Newton.
• He introduced it in 1687 in his famous book Principia.
• It explains that every object attracts every other object.
• The force depends on mass and distance.

Last verified on 27-04-2026

Explanation

• Mumps and measles are prevented mainly through vaccination.
• Both mumps and measles are viral diseases.
• The MMR vaccine protects against Measles, Mumps, and Rubella.

Last verified on 11-08-2026

Explanation

• Main transmission: Contaminated water and food.
• Disease: Cholera.
• Causative organism: Vibrio cholerae.
• Major symptom: Severe watery diarrhea.
• Prevention: Safe water, sanitation, and good hygiene.

Last verified on 11-08-2026

Explanation

• Ozone (O₃) is mainly found in the Stratosphere, called the ozone layer.
• It absorbs harmful ultraviolet (UV) radiation from the sun, protecting life on Earth.
• Located roughly 15–35 km above the Earth’s surface.

Last verified on 17-01-2026