Explanation

• In MS Excel, letters (like B) represent columns, while numbers (like 3) represent rows.
• So, in cell address B3, B is the column number, and 3 is the row number.

Last verified on 26-05-2026

Explanation

• Almost all the mass of an atom is concentrated in its nucleus.
• The nucleus contains protons and neutrons, which are much heavier than electrons.
• Electrons revolve around the nucleus but contribute very little to atomic mass.
• The nucleus is located at the center of the atom.
• Ernest Rutherford discovered the nucleus through the gold foil experiment in 1911.

Last verified on 09-05-2026

Explanation

1. The Quran
2. The Sunnah (traditions of the Prophet Muhammad SAW)
3. Ijma (consensus among Muslim jurists)
4. Qiyas (analogy)

Last verified on 30-04-2026

Explanation

• Translocation is the process by which food made in the leaves moves to other parts of the plant through the phloem.
• In plants, food is produced in the leaves through photosynthesis.
• This prepared food must be transported to other parts like roots, stems, and fruits.

Last verified on 16-03-2026

Explanation

• The symbol ⁴₂He indicates helium has 2 protons (atomic number = 2) and mass number = 4.
• In a neutral atom, the number of electrons = protons, so helium has 2 electrons.

Last verified on 13-03-2026

Explanation

CPU speed is primarily measured in Hertz (Hz), and Gigahertz (GHz) for modern processors

The fundamental unit is Hertz (Hz), where 1 Hz = 1 cycle per second.

Modern Units: Most, if not all, modern processors use Gigahertz (GHz), where  1 GHz = 10^9 Hz (one billion cycles per second).

Context: It is often referred to as the "clock speed" or "clock rate" of the CPU.

Mbps measures internet speed.

Mbytes measure data size.

Last updated 15-feb-2026

Explanation

Article 25-A of the Constitution of Pakistan obligates the state to provide free and compulsory education to children aged 5 to 16 years.

This article ensures that every child has access to education as a fundamental right.

Explanation

• A plane mirror produces a virtual image, meaning it's not a real image that can be projected onto a screen.
• The image is also upright, meaning it's not inverted or flipped.

Explanation

• The oesophagus is a muscular tube that connects the pharynx (throat) to the stomach.
• Its main function is to transport food from the pharynx to the stomach through peristalsis (wave-like muscle contractions).

Explanation

Gravitational force is the natural force of attraction between any two masses in the universe.

This force is always attractive.

It acts along the line joining the centers of the two masses.