Explanation

• A true solution is a homogeneous mixture in which the solute is completely dissolved in the solvent at the molecular level. 
• The particles are very small and cannot be seen with the naked eye. 
• True solutions are stable and do not settle down on standing.

Examples of true solutions (homogeneous mixtures):

• Salt in water (NaCl solution)
• Sugar in water
• Vinegar in water
• Alcohol in water
• Copper sulfate in water

Last verified on 15-03-2026

Explanation

• According to Albert Einstein, light travels in the form of photons, which are tiny packets (quanta) of energy.
• This concept was proposed in 1905 while explaining the photoelectric effect.
• Photons behave like particles but also show wave properties.

Last verified on 15-03-2026

Explanation

• Valency is the combining capacity of an atom to form molecules or compounds.
• It depends on the number of electrons an atom can lose, gain, or share to complete its outer shell.

Last verified on 15-03-2026

Explanation

• All plants move Anticlockwise around Sun.
• All plants move anticlockwise around their axis.
• Earth rotates its axis from West to East.

Last verified on 15-03-2026

Explanation

• Fluoride is commonly added to drinking water in small amounts to prevent tooth decay (dental cavities).
• It strengthens tooth enamel and makes teeth more resistant to acid attacks from bacteria and sugars.
• Community water fluoridation began in 1945 in the United States as a public health measure.

Last verified on 15-03-2026

Explanation

• Mitochondria are cell organelles responsible for producing energy in the form of ATP (Adenosine Triphosphate) through cellular respiration. 
• They are called the “Powerhouse of the cell” because they provide the energy required for all cellular activities.
• Mitochondria have their own DNA and ribosomes, allowing them to replicate independently.

Last verified on 14-03-2026

Explanation

Work done (W) by a force is calculated as:

W = F × d × cosθ.

• F = force applied
• d = displacement of the body
• θ = angle between force and displacement

When θ = 0° (force parallel to motion), cos 0° = 1, so work done is maximum.

Last verified on 14-03-2026

Explanation

• The Sukkur Barrage, officially named Lloyd Barrage, is located in Sindh Province.
• It built from 1923 to 1932 during the British Raj.
• It was rehabilitated in November 2004. 
• The barrage is approximately 2 km (1 mi) long.
• It is the oldest in Pakistan, with seven canals taking off from it.

Last verified on 14-03-2026

Explanation

While means during the time that something is happening.

After means later than or following a particular time, which is the opposite idea.

• While means اس وقت کے دوران جب کچھ ہو رہا ہے۔
• After means کسی خاص وقت کے بعد یا اس کے بعد

Last verified on 14-03-2026

Explanation

Oman Capital is Muscat.

Oman Currency is Omani Rial.

Oman official language is Arabic.

Oman located is in Continent Asia.

Oman Primary Religion is Islam.

Norway Parliament called Monarchy.

Last verified on 14-03-2026