Explanation

Decaying involves the breakdown of organic matter into simpler substances through chemical reactions.

It alters the original composition of the material, which is a hallmark of a chemical change.

Explanation

Work done = F × d × cos(θ); when angle θ = 180°, cos(180°) = -1.

So, if force and displacement are antiparallel (opposite), the work is negative.

Explanation

She told the doctor that she would be going to Murree the next day.

"Said to" changes to "told" and "will" changes to "would" in indirect speech.

"Tomorrow" becomes "the next day" as per rules of reported speech.

Explanation

For the X and Y components of a force to be equal:

Fx = Fy

Given F = Fx i + Fy j = F cos(θ) i + F sin(θ) j

Fx = F cos(θ)

Fy = F sin(θ)

For Fx = Fy:

F cos(θ) = F sin(θ)

cos(θ) = sin(θ)

tan(θ) = 1

θ = 45°

Explanation

Kinetic energy (K) is related to momentum (p) by K = p² / 2m. If momentum increases by 20%, the new momentum p' = 1.2p.

The new kinetic energy K' = (p')² / 2m = (1.2p)² / 2m = 1.44p² / 2m = 1.44K.

The percentage increase in K.E is ((K' - K) / K) × 100 = ((1.44K - K) / K) × 100 = 44%.

Explanation

A D.C. generator uses split rings (commutator) to reverse the current direction in the coil every half rotation.

This ensures that the output current flows in one direction (direct current).

Explanation

Foresight means دور اندیشی

Improvidence means دور اندیشی یا منصوبہ بندی کا فقدان

Explanation

According to the law of reflection, angle of incidence = angle of reflection.

So, if light strikes at 30°, it reflects at 30°.

Explanation

Amateur means کوئی ایسا شخص جو پیشہ ورانہ مہارت یا تربیت کے بغیر کچھ کرتا ہے

Non-professional means کوئی ایسا شخص جو پیشہ ورانہ مہارت یا تربیت کے بغیر کچھ کرتا ہے

Explanation

Java applets are small programs written in Java that run inside a web browser.

They are used for interactive features in web applications (though now largely outdated).