Learn English – “Such are his usual responses…” or “Such is his usual responses…”

The use of words ending in "-ics" is governed by whether you are referring to a single body of knowledge or to objects/things.

But statistics has something more than this.

These statistics you presented are a pack of lies.

In the first sentence, "statistics" is used in the sense of "the field of statistics" or "the study of statistics". These are singular concepts. But in the second sentence, suddenly "statistics" is referring not to a single set of knowledge, but to multiple pieces of data. A plural verb should be used.

Until recently optics has only been three dimensional, and holography belongs to this form, too.

The optics in her telescope were superb.

Here again, "optics" is a field or concept. In the first sentence, the speaker is discussing optics in general, as a single whole. In the second, the speaker is talking about the particular lenses in the telescope.

For "mathematics", compare:

The field of mathematics is distinguished by its numerous contributors from across the world and through time.

The mathematics of quantum physics are hard for the average person to understand.

Generally speaking, if you are referring to a unified whole or a single thing, use the singular verb form. If you are talking about specific particular objects or subdivisions of a subject, use the plural form.

As snailplane and Man_From_India tell you, your question does not involve adjectives, which never have a distinct plural form, but attributive nouns.

The singular form is certainly the ‘default’ for attributive constructions, but plural attributives are not uncommon. Some of these (and probably most of the older ones) come about because the singular and plural forms have different meanings. For instance

• We take an ‘arts degree’ or a ‘humanities degree’ because the singular would imply something different: an ‘art degree’ is a degree in painting or sculpture or something of the sort rather than a degree from the School or Faculty of Arts, and a ‘humanity degree’, would be a degree from the Department of Humanity, if such a thing existed.
• We speak of the ‘civil rights movement’ because ‘civil rights’, plural, is a term with a specific meaning, the entire body of rights supposed to be held by all members of a civil society rather than a specific civil right or a general desire for ‘rightness’ in civil society.

In other cases, the plural seems to have come about as a sort of compromise where the underlying sense might represent a simple plural or a singular possessive or a plural possessive—see, for instance, this blogpost on the correct spelling of Veterans Day. (But this is by no means a rule; see this Google Ngram on various names for the laws under which US workers are compensated for on-the-job injuries.)

In yet other cases, grammatical concord seems to be in play. We speak of Virginia Woolf as a woman writer, but we are more likely to call Woolf and Eudora Welty and Flannery O’Connor women writers than woman writers. Geoffrey Leech, in Change in Contemporary English, Cambridge, 2009 (220) suggests that this is more likely when the plural is irregular, without an -s.

But none of this explains why plural attributives became much more common in the second half of the 20th century, particularly in British English. Leech suggests that:

The increase of plural attributive nouns may well have been brought on by the general increase in noun sequences, bearing in mind that the implicit link between two adjacent nouns has to be inferred, putting a burden on the cognitive processing abilities of the reader. In such circumstances an -s at the end of a word may be a handy clue to interpretation. Thus the generic meaning of the plural in weapons purchases or fisheries protection is helpful in eliminating the possibility of a singular interpretation (that one weapon is to be purchased, or that one fishery is to be protected) and in capturing the intended generic meaning of the whole (220-221).

Leech says that Stig Johannson, Plural attributive nouns in present day English, Univ. Lund, 1980, identifies more factors, but this does not appear to be available free online.