Explanation

Hydrogen is the lightest element, and its most common isotope (protium) has no neutrons in its atomic nucleus.

The atomic number of hydrogen is 1, which means it has one proton in its nucleus, but no neutrons.

The three main isotopes of hydrogen:

• Protium (1H): 1 proton, 0 neutrons
• Deuterium (2H or D): 1 proton, 1 neutron
• Tritium (3H or T): 1 proton, 2 neutrons

Explanation

Saturated hydrocarbons are called alkanes.

Alkanes are a type of hydrocarbon that have only single bonds between the carbon atoms, and are "saturated" with hydrogen atoms.

They have the general formula CnH2n+2 and are also known as paraffins.

Examples of alkanes include methane (CH4), ethane (C2H6), and propane (C3H8).

Explanation

CRT (Cathode Ray Tube) is a type of output device.

It displays visual information on a screen.

Such as in old computer monitors and televisions.

Explanation

The question tag must match the auxiliary verb "should" in the main sentence.

"Shouldn't we?" is the appropriate response for agreement with "we should."

Explanation

Four years ago, the average age of A, B, and C was 25 years.

This means that the total age of A, B, and C four years ago was 25 x 3 = 75 years.

Since then, all three have aged 4 years, so their total age now is 75 + 4 + 4 + 4 = 87 years.

Five years ago, the average age of B and C was 20 years.

This means that the total age of B and C five years ago was 20 x 2 = 40 years.

Since then, both B and C have aged 5 years, so their total age now is 40 + 5 + 5 = 50 years.

Now, we know that the total age of A, B, and C is 87 years, and the total age of B and C is 50 years.

So, A's current age is 87 - 50 = 37 years.

The correct answer is: 37 years

Explanation

Free software and Open-source software are often used interchangeably, but they have slightly different meanings:

• Free software refers to software that is distributed free of cost, and the user has the freedom to use, modify, and distribute it.
• Open-source software refers to software whose source code is made available publicly, allowing users to view, modify, and distribute the software.

Explanation

In Excel, Texture describes a background that appears as a grainy, non-smooth surface.

This tab shows a number of different surface textures that can be used to fill in the drawing object.

Explanation

Since the student who left weighed 45 kgs, the total weight of all 60 students (including the student who left) is 59x + 45.

When the student left, the average weight of the remaining 59 students increased by 200g (or 0.2 kgs), so we can set up the equation:

59x + 45 = 60(x - 0.2)

Simplifying the equation, we get:

59x + 45 = 60x - 12

Solving for x, we get:

x = 57

So, the correct answer is: 57

Explanation

یہ پریم چند ہی کا نہیں بلکہ اردو ادب کا بھی بہترین افسانہ ہے۔ یہ دو باپ بیٹوں کی کہانی ہے۔ جس میں جوان بہو زچگی کے عمل میں مر جاتی ہے۔ لاش کے لیے کفن نہیں ہوتا۔ دونوں باپ بیٹے کام چور ہوتے ہیں۔ کوئی ان کی مدد کے لیے تیار نہیں ہوتا مگر آخر کار انسانی ہمدردی کے تحت کفن کے لیے پیسے جمع ہو جاتے ہیں۔ دونوں باپ بیٹا کفن لینے نکلتے ہیں اور شراب خانے جا کر سارے پیسے خرچ کر دیتے ہیں۔
بنیادی طور پر کفن کی کہانی تین حصوں پر مشتمل ہے۔ جس میں پہلے حصے میں کرداروں کا تعارف، دوسرا حصہ بہو کی موت اور اثرات ، تیسرا حصہ۔۔۔

Explanation

ENGRO is a Pakistani multinational conglomerate company headquartered in Karachi, Pakistan.

It is founded in 1965.

It is one of the largest companies in Pakistan, with interests in fertilizers, energy, chemicals, food, and other sectors.