Explanation

ISDN is a set of communication standards for simultaneous digital transmission of voice, video, and data.

It allows faster and more reliable connectivity than traditional analog systems.

Explanation

When comparing how two people speak, use the comparative form "more clearly" with an adverb of more than one syllable.

"Clearly" alone is positive.

Explanation

یہ مصرع دعا منڈی کی نظم کا حصہ ہے جو غالب کے اشعار میں سے ہے۔

غالب نے اپنی وفات پر اس شعر میں یہ دکھایا کہ وہ اپنی محبت یا وطن (کوئے یار) میں دفن نہ ہو سکے۔

Explanation

"Several" refers to an indefinite number, indicating how many mistakes — qualifying it as an Adjective of Number.

It also shows quantity (not exact), so it works as a Quantity Adjective too.

Explanation

The sentence is in simple past tense, so the passive form should be "was sent."

"A parcel was sent by them on Monday" correctly maintains the tense and structure.

Explanation

Let's use the quadratic formula to find the roots:

x = (-b ± √(b² - 4ac)) / 2a

For the given equation x² - 3x + k + 1 = 0:

a = 1, b = -3, c = k + 1

The roots differ by unity, so:

√(b² - 4ac) = 1

(-3)² - 4(1)(k + 1) = 1

9 - 4k - 4 = 1

5 - 4k = 1

-4k = -4

k = 1

Explanation

Given:

Sum of numbers = -8

Product of numbers = 15

The algebraic expression representing this is:

x^2 - (sum)x + (product) = 0

x^2 - (-8)x + 15 = 0

x^2 + 8x + 15 = 0

The correct answer is: x^2 + 8x + 15

Explanation

A complex sentence consists of one independent clause and one or more dependent clauses connected by subordinating conjunctions.

Dependent clauses cannot stand alone as complete sentences, whereas the independent clause can.

Explanation

• Antoine Lavoisier, a French chemist, is credited with discovering the law of conservation of mass in 1789 (1785).
• He demonstrated that matter cannot be created or destroyed in a chemical reaction, only transformed from one substance to another.

Explanation

The correct expression is "kept me waiting", where "waiting" is the present participle, indicating an ongoing action.

It means he made me wait for a period of time.