Explanation

Equilateral Triangle Three equal angles, always 60

all sides are of equal length (equilateral), and all  angles are right angles. 

A triangle that has no equal sides and no equal angles is known as a Scalene Triangle

while 

if two sides of a triangle are of equal length, then it is called. Isosceles triangle

Explanation

The atmosphere is comprised of layers based on temperature. These layers are the

troposphere

stratosphere

mesosphere 

thermosphere

A further region at about 500 km above the Earth's surface is called the exosphere.

Explanation

let the maximum marks be x

Candidate A score = 20% of x

= 20/100 (x)

=> x/5a

Candidate fails by 50 marks

Hence , candidate would have passed if 50 marks are added to his marks :

x/5 +50 => (x+250)/5

Now, score of Candidate B

40% of x

=> 40/100 (x) =>2x/5

A.T.Q

2xs/5 - 30

=> (2x-150)/5

both the equations are equal as both the equations justify minimum passing marks

Hence, (x+250)/5 = (2x-150)/5

cancelling 5 from both sides

x+250 = 2x - 150

x = 400

Explanation

Speed              =distance/time

=>speed          = (600/300) x (18/5)

                                    =7.2 km/hr

Explanation

Angstrom , unit of length used chiefly in measuring wavelengths of light, equal to 10−10 metre, or 0.1 nanometer.

It is named for the 19th-century Swedish physicist Anders Jonas Ångström.

Explanation

The Caribbean  is a region of the Americas that comprises the Caribbean Sea, its surrounding coasts, and its islands.

Explanation

For an approximate result, multiply the mass value by 2.205

Explanation

Lead is a chemical element.

Symbol Pb  and atomic number 82.

It is a heavy metal that is denser than most common materials.

Explanation

Scientists at NASA have detected water vapour for the first time above the surface of Europa, a finding that supports the idea of a liquid water ocean sloshing beneath the miles-thick ice shell of the Jupiter's moon.

Explanation

Active: One should not give unsolicited advice

Passive: Unsolicited advice should not be given

Unsolicited advice should not be given means بلاجواز مشورہ نہ دیا جائے

Active voice: should not 

Passive voice: should not be 

******