Obrázková otázka není zvuková ukázka.

Because Czech adjectives must agree with the nouns they describe.

In this sentence:

• obrázková describes otázka
• zvuková describes ukázka

Both otázka and ukázka are feminine singular nouns in the nominative, so the adjectives also take the feminine singular nominative ending -á.

Compare the basic adjective forms:

• obrázkový / zvukový = masculine
• obrázková / zvuková = feminine
• obrázkové / zvukové = neuter

A very common clue in Czech is the ending -a in the dictionary form. Nouns ending in -a are often feminine.

So:

• otázka is feminine
• ukázka is feminine

This is not an absolute rule for every Czech noun, but it is a very useful beginner pattern.

Both are in the nominative singular.

• otázka is the subject
• ukázka is the predicate noun after není

In simple identifying or classifying sentences, Czech often uses the nominative on both sides:

• X je Y
• X není Y

You may also encounter the instrumental after být in other contexts, but this sentence uses the nominative pattern.

Není is simply the negative form of je in the 3rd person singular of být.

So:

• je = is
• není = is not

This verb is irregular, so modern Czech uses není, not a separate ne je.

Related forms:

• jsem / nejsem = I am / I am not
• jsi / nejsi = you are / you are not
• je / není = he, she, it is / is not
• jsou / nejsou = they are / are not

Because Czech has no articles.

That means Czech does not normally use separate words corresponding to English a/an or the. Whether something is definite or indefinite is understood from context.

So this sentence can mean something like:

• A picture question is not an audio sample or
• The picture question is not the audio sample

The exact interpretation depends on the situation.

Obrázková is the feminine form of obrázkový, an adjective related to obrázek = picture.

So obrázková otázka means something like:

• picture-based question
• image question
• pictorial question

The adjective tells you that the question is connected with an image or picture.

Zvuková is the feminine form of zvukový, from zvuk = sound.

So zvuková ukázka means:

• sound sample
• audio sample
• audio clip

It describes something connected with sound.

Yes. Czech word order is much more flexible than English word order.

The sentence as given is neutral and natural: Obrázková otázka není zvuková ukázka.

Because Czech uses endings to show grammatical relationships, words can often move for emphasis or contrast. But the original order is the most straightforward one for a learner.

So the short answer is:

• yes, word order can change
• but this version is the normal neutral one

Because Czech accent marks show vowel length, not stress.

In Czech, stress usually falls on the first syllable of the word, while á and í simply mean the vowel is long.

So roughly:

• OB-ráz-ko-vá
• OT-áz-ka
• NE-ní
• ZVU-ko-vá
• U-káz-ka

English speakers often expect the marked vowel to be stressed, but in Czech that is usually not what the accent mark means.

Not in meaning. They are different words:

• otázka = question
• ukázka = sample, demonstration, excerpt

They just share a very common feminine noun ending, -ka. Czech has many nouns with that ending, so matching endings do not automatically mean the words are closely related.