Explanation

The idiom "as different as night and day" means two things are completely opposite.

Although we are brothers, but we are as different as day and night.

Explanation

Given:

x = 1 / (√2 - 1)

To simplify, multiply the numerator and denominator by (√2 + 1):

x = 1 / (√2 - 1) × (√2 + 1) / (√2 + 1)

= (√2 + 1) / (√2² - 1²)

= (√2 + 1) / (2 - 1)

= (√2 + 1)

Now, find x - 1/x:

x - 1/x = (√2 + 1) - 1 / (√2 + 1)

= (√2 + 1) - (√2 - 1) / (√2 + 1)(√2 - 1)

= (√2 + 1) - (√2 - 1) / (2 - 1)

= (√2 + 1) - (√2 - 1)

= (√2 + 1 - √2 + 1)

= 2

Explanation

Transitional devices are words or phrases that connect ideas smoothly in writing.

"Whereas" and "Finally" are used to contrast and conclude thoughts, making them transitional devices.

Explanation

Object pronouns receive the action in a sentence.

In the sentence "She gave me the book," "me" is the object pronoun as it receives the action of "gave."

Explanation

معراج کے واقعہ کے ذکر سورہ بنی اسرائیل میں آیا ہے۔

معراج کی رات نبی کریم ﷺ نے ایسے واعظوں کو دیکھا جو دوسروں کو نصیحت کرتے لیکن خود عمل نہ کرتے تھے۔

ان کے ہونٹوں کو لوہے کی قینچیوں سے کاٹا جارہا تھا، جو ان کے قول و فعل کے تضاد کی سزا تھی۔

Explanation

Wave velocity is the distance a wave travels per second in a given medium.

It is calculated as Velocity (v) = Frequency (f) × Wavelength (λ).

Explanation

سہیل بن عمرو اپنے بیٹے کو دیکھ کر کہنے لگا کہ اے محمد ! (صلی اللہ تعالیٰ علیہ وسلم) اس معاہدہ کی دستاویز پر دستخط کرنے کے لئے میری پہلی شرط یہ ہے کہ آپ ابو جندل کو میری طرف واپس لوٹایئے۔

Explanation

The refractive index (n) is defined as:

n = Speed of light in air / Speed of light in medium

Given:

n = 1.5

Speed of light in air = 3 × 10⁸ m/s

Rearrange the formula to solve for Speed of light in glass:

Speed of light in glass = Speed of light in air / n

= (3 × 10⁸ m/s) / 1.5

= 2 × 10⁸ m/s

Explanation

Learnt is the second and third form of Learn.

Learn means سیکھنا یا علم حاصل کرنا

A transitive verb required an object while intransitive verb does not.

Explanation

"Whom" is correct because it is the object of the verb "met."

"Who" is used as a subject, but here, "I" is the subject, so "whom" is appropriate.