Explanation

The principles of child study in educational psychology are primarily used to achieve educational objectives.

These principles help in understanding how children learn and develop, guiding effective teaching strategies.

Explanation

"Built with bricks" is the correct and standard prepositional usage in English.

It means bricks were used as a material in the construction.

Explanation

"When I heard him talk so" gives more information about the time of the action "was surprised," which is a function of an adverb clause.

It begins with the subordinating conjunction "when" and contains a subject ("I") and a verb ("heard"), forming a dependent clause.

Explanation

احد پہلے ہی ایک پہاڑ کا نام ہے، اس لیے "جبل احد کا پہاڑ" کہنا الفاظ کی تکرار ہے۔

درست اور جامع جملہ ہے: "میں نے احد کا پہاڑ دیکھا"۔

Explanation

"Huge" describes the size of the house, which classifies it as an adjective of size.

It provides information about the dimension or magnitude of the house.

Explanation

Spirogyra is a filamentous green alga classified under the Kingdom Protista.

It lives mostly in freshwater.

It is known for its spiral chloroplasts.

Explanation

Asteroids are actually larger than meteoroids, not smaller.

They are made of rock or metal and revolve around the Sun like planets.

Explanation

A digraph is two letters that make one sound, like "th" in think.

In a digraph, both letters combine to produce a single phoneme (sound).

Explanation

Explanation

To find the cost of painting, we need to calculate the surface area of the cuboid:

Surface Area = 2(lw + lh + wh)

= 2(43.5 + 46 + 3.5*6)

= 2(14 + 24 + 21)

= 2 * 59

= 118 square meters

Now, cost of painting:

Cost = Surface Area * Rate

= 118 * 43.78

= 5166.04