Explanation

USB stands for Universal Serial Bus

It is a standard interface for connecting computer peripherals, such as keyboards, mice, printers, and external hard drives.

Explanation

Note: The answer given in the FPSC answer key is (c) but the actual answer is (b).

A rudder is a steering device used in boats and ships.

Birds do not have rudders.

They use their wings and tail feathers for steering and balance.

Explanation

Each pair of shoes consists of 2 shoes, so 100 pairs of shoes equals:

$$100\times 2=200\text{ shoes}$$

Each case holds 20 shoes, so to find how many cases are needed:

200/20 ​=10 cases

Explanation

Let's break this down logically:

(i) A toothpaste is useful.

(ii) Useful things are valuable.

From (i), we know that a toothpaste is useful. And from (ii), we know that useful things are valuable.

Therefore, since toothpaste is useful (from i), and useful things are valuable (from ii), we can conclude that toothpaste is valuable.

Thus, statement (iii) "A toothpaste is valuable" follows logically from (i) and (ii).

The correct answer is:

(a) True

Explanation

The formula for Intelligence Quotient (IQ) is:

$$text{IQ} = frac{text{Mental Age (MA)}}{text{Chronological Age (CA)}} times 100$$

Explanation

Soil pollution can be caused by acid rain.

It is a type of precipitation that contains high levels of sulfuric and nitric acid.

This can occur when fossil fuels are burned, releasing sulfur dioxide and nitrogen oxides into the atmosphere, which then combine with water and oxygen to form acid rain.

Acid rain can alter the pH of the soil, making it more acidic and potentially harmful to plants and microorganisms.

Explanation

The correct option is Trees help to create peaceful surroundings.

The word "surroundings" is a plural noun, so it requires a plural verb.

In this case, the plural verb "help" agrees with the plural subject "Trees."

Explanation

The correct option is: This is the only one of his poems that is worth reading.

In this sentence, the verb "is" agrees with the singular noun "one."

The phrase "of his poems" modifies "one," but it doesn't change the singular nature of the subject.

Therefore, the singular verb form "is" is correct.

Explanation

The correct option is: Cats can see in the darkness.

This sentence is grammatically correct and conveys the general truth about cats' ability to see in low-light conditions.

Explanation

The correct option is: The Japanese couple at the back of the coach were obviously newly-weds.

In this sentence, "The Japanese couple" is the subject.

Since "couple" refers to two people, the verb should be plural.

Therefore, "were" is the correct verb form to agree with the plural subject.