Adjective :- Adjective are words or group of words that describes people, places or things. for example :- This is a tasty apple. In this example tasty is an adjective which tells us the quality of apple.

Adjective of Quality : - An adjective which is used in the sentence to express the size, shape, and color of a person, thing, animal, or place An adjective which is used in the sentence to express the size, shape, and color of a person, thing, animal, or place . some words related to this are : beautiful , large , wise , honest , foolish etc .

Example : - Nina’s hair is very shining and smooth. Here , shining and smooth is an adjective of quality as it shows the quality of Nina 's hair that it is shining and smooth . 

Rules to remember adjective of quality : -

1. When two adjectives qualify the same noun , both the adjectives should be expressed in the same degree . For example

(i) She is the most active and energetic social worker in our club .

(ii) She is both cleverer and intelligent than her sister .

2. The order of adjectives qualifying a noun ( S S A C N M)

Size Shape Age Colour Nationality Material Noun

In the question : -

My sister is always __________________ in the morning. she gets angry at the slightest thing. In this sentence , Bad-tempered is the correct adjective of quality that can be placed in the blank part as it is used to show the quality of my sister that she is Bad-tempered .

Thus , the Correct Option is B , which is Bad-tempered .

Adjective : - An adjective is a word that generally modifies a noun or noun phrase or describes its referent. Its semantic role is to change information given by the noun .

Adjective of Quality : - An adjective which is used in the sentence to express the size, shape, and color of a person, thing, animal, or place. Descriptive adjectives are used to give more information about the noun.

Example : -  The foolish old crow tried to sing . Here , foolish old is an adjective of quality as it shows the feature of a crow .

In the question : -

1. Exam was very difficult however; bright candidates passed it easily. In this sentence , the correct adjective of quality is different as it shows the feature of exam and bright is also an adjective of quality as it shows the quality of candidates .

2. Pretty girl was very excited to visit the hilarious Disney world. In this sentence , the correct adjective of quality is pretty as it shows the quality of girl and hilarious is also an adjective of quality as it shows the feature of disney world .

3. She cried when beautiful birds flown away. In this sentence , the correct adjective of quality is beautiful as it shows the quality of birds .

Thus , the Correct option is B ,which is  Difficult , Bright  Pretty , Hilarious , Beautiful .

Adjectives : - Adjectives are words that describe or modify other words such as  like small, blue, and sharp are some examples of adjectives. They are usually positioned before the nouns and pronouns that they modify. Some sentences contain multiple adjectives.

Degree of Comparison : - A degree of comparison is a form of adjective that is used to compare a person or thing possessing the same quality with another .

• Rama's mango is sweet.
• Hari's mango is sweeter than Rama's
• Govind's mango is the sweetest of all.

In sentence 1, the adjective sweet merely tells us that Rama's mango has the quality of sweetness, without saying how much of this quality it has.

In sentence 2, the adjective sweeter tells us that Hari's mango, compared with Rama has more of the quality of sweetness.

In sentence 3, the adjective sweetest tells us that of all these mangoes Govind's mango has the greatest amount or highest degree of the quality of sweetness.

We thus see that Adjectives change in form ( sweet, sweeter, sweetest) to show comparison. They are called the three Degree of Comparison .

In the question : -

Don't go in the garden. There is a ______________ snake moving around there.

In this sentence , the correct degree of comparison that can be placed in the blank part is Poisonous as it means something which is toxic . Poisonous is the positive degree of comparison .

Thus , the Correct Option is D , which is Poisonous .