Explanation

• Threshold frequency is the minimum frequency of light required to eject electrons from a metal surface.
• Aluminum has a higher threshold frequency than sodium because its line begins at a higher frequency.
• The slope of the kinetic energy versus frequency graph is the same for both metals because it represents Planck’s constant.

Last verified on 25-10-2026

Explanation

After 1 half-life = half remains = N/2

After 2 half-life = half of N/2 remains = N/4

Last verified on 25-10-2026

Explanation

• X-rays are also known as Roentgen rays.
• It named after German physicist Wilhelm Conrad Röntgen, who discovered them in 1895.
• X-rays are a form of electromagnetic radiation with high energy and short wavelengths.
• They can pass through soft tissues.
• The are widely used in medical imaging.

Last verified on 25-10-2026

Explanation

• Force is defined as the rate of change of linear momentum with respect to time.
• According to Newton’s second law, force causes a change in an object’s momentum.

Last verified on 25-10-2026

Explanation

Passage: However, it must be recognized that science has its limitations. Its methods apply only to those things which can be observed, measured, and treated mathematically. It has nothing to do with values save those of truth and accuracy. It has nothing to do with happiness, goodness, beauty, courage, adventure, justice, altruism, friendship, love of family, love of country. Yet all these values enter into a man's conception of what is the good personal life within a good society. It is possible for honest and intelligent men to differ profoundly on the nature of these values and their respective degrees of importance. Hence the contrast between the modern world's command of material things and its tragic failure to organize a harmonious world society.

1. It can be inferred from the passage that the author thinks? A good personal life can be achieved by recognizing the nature of values and their degree of importance

2. According to the author, science is concerned primarily with things that can be? Observed, measured, and treated mathematically

Last verified on 25-10-2026

Explanation

• “Jeans” is a plural noun and normally takes a plural verb.
• Example: “These jeans are new.”

Last verified on 25-10-2026

Explanation

• Miscellaneous means متفرق

Last verified on 25-10-2026

Explanation

• “Negligible” means very small or unimportant.
• “Momentous” means very important or significant.
• Negligible means بہت چھوٹا یا غیر اہم
• Momentous means بہت اہم یا اہم
• Significant means بہت اہم یا اہم

Last verified on 25-10-2026

Explanation

• “Interruption” means stopping or breaking the continuous flow of an activity.
• “Continuity” means an uninterrupted, ongoing flow or state.
• Interruption means کسی سرگرمی کے مسلسل بہاؤ کو روکنا یا توڑنا
• Continuity means ایک بلاتعطل، جاری بہاؤ یا حالت

Last verified on 25-10-2026

Explanation

• Absence of Light will make Blind.
• Absence of Speech will make Dumb.

Last verified on 25-10-2026