Explanation

Infrasonic sounds have frequencies below 20 Hz, which are too low for human hearing.

Ultrasonic refers to sounds above 20,000 Hz.

Audible is the range between 20 Hz and 20,000 Hz.

Explanation

An ideal teacher not only imparts knowledge but also mentors and supports students emotionally and intellectually.

Being a friend, philosopher, and guide helps build trust and inspires lifelong learning.

Explanation

اونٹ کو "خشکی کا جہاز" کہا جاتا ہے کیونکہ وہ ریگستانوں میں لمبے سفر طے کرنے کی صلاحیت رکھتا ہے۔

اس کی ساخت، قوتِ برداشت اور پانی کے بغیر چلنے کی صلاحیت اسے ریگستانی علاقوں کے لیے بہترین بناتی ہے۔

Explanation

روزمرہ سے مراد ہے اہلِ زبان کی عام اور مخصوص بول چال۔

اس میں الفاظ اپنے حقیقی معنوں میں استعمال ہوتے ہیں، محاوروں کے برعکس۔

Explanation

Step 1: Recall Ohm's Law

V = IR, where V is voltage, I is current, and R is resistance.

Step 2: Convert current to amperes

300 mA = 0.3$ A

Step 3: Calculate the resistance

R = V/I = 1.5/0.3 = 5 Ω

Explanation

The number 1 is called the multiplicative identity because multiplying any real number a by 1 leaves it unchanged: a × 1 = 1 × a = a.

This property holds for all real numbers (∀ a ∈ R).

Explanation

Range is the simplest measure of data spread, calculated by subtracting the smallest value from the largest value.

It gives an idea of how widely the data values are spread.

Explanation

A cyclone refers to a large system of winds rotating around a low-pressure center, covering several kilometers.

A twister (or tornado) is much smaller in scale.

Explanation

Teachers influence students most by their own actions.

Behaving ideally sets a live example for students to follow.

Explanation

Fluids are substances that can flow — this includes both liquids and gases.

Unlike solids, fluids have no fixed shape and take the shape of their container.