Explanation

A galaxy is a gravitational system of stars, star remnants, interstellar gas, dust, and dark matter.

Earth: diameter of approximately 12,742 kilometers (7,918 miles)

The Sun: diameter of approximately 1,392,684 kilometers (865,374 miles)

Solar System: diameter of approximately 9.2 billion kilometers (5.7 billion miles)

Galaxy (Milky Way): diameter of approximately 100,000 to 200,000 light-years (9.461 × 10^17 to 1.884 × 10^18 kilometers)

Explanation

This is a sentence of Present Indefinite Tense.

We use first form (come) in simple sentences of Present Simple Tense.

They always Come back home late. 

Explanation

• The Battle of Uhud, the second battle of Islam.
• It was fought in 3 Hijri (625 AD).
• Abu Sufyan was the commander of the infidels.
• Ohad is the name of a mountain.
• In this battle, 1,000 Muslims faced 3,000 infidels.

Explanation

• Sound travels fastest in diamond,
• With a speed of approximately 12,000 meters per second (m/s).
• Because sound travels fastest in stiff, dense materials

Additional information 
The speeds of sound in different materials:

• Air: 343 m/s
• Water: 1433 m/s
• Wood: 3300-3600 m/s
• Brick: 4176 m/s
• Steel: 6100 m/s
• Diamond: 12000 m/s

Explanation

Find how many man-days to complete the road:

70*35 = 2450 man-days

Let d = days required for 40 men to do it.

40d = 2450

d=402450​=61.25

Explanation

To find the number, you can set up an equation:

7% of x = 42

To solve for x, you can convert the percentage to a decimal by dividing by 100:

0.07x = 42

Then, divide both sides by 0.07:

x = 42 / 0.07

x = 600

So, the number whose 7% is 42 is 600!

Explanation

Pakistan, officially the Islamic Republic of Pakistan, is a country in South Asia.

Pakistan is the world's fifth-most populous country.

Pakistan is the world's second-largest Muslim population.

Pakistan is the 33rd-largest country by area.

The capital of Pakistan is: Islamabad

the Currency of Pakistan is: the Pakistani rupee

Explanation

Invertebrates are animals that do not have a backbone or spinal column. This group includes:

• Insects
• Arachnids (like spiders and scorpions)
• Crustaceans (like crabs and lobsters)
• Mollusks (like squids and octopuses)
• Echinoderms (like starfish and sea urchins)
• Worms

Explanation

Honey has natural antibacterial properties and low moisture, preventing spoilage.

Archaeologists have found edible honey in ancient Egyptian tombs, thousands of years old.

Explanation

PCR (Polymerase Chain Reaction) is the most sensitive and accurate test for detecting viral genetic material.

It can detect even very low amounts of virus in early stages of infection.