यह अध्याय छोटा है।

Here, यह means this, so यह अध्याय = this chapter.

A useful point: यह can also mean he, she, or it depending on context. Hindi does not have separate everyday words for this and it/he/she the way English does. The surrounding words tell you which meaning is intended.

In this sentence, because अध्याय means chapter, the natural translation is this chapter.

Hindi commonly puts the adjective before है:

यह अध्याय छोटा है।
Literally: This chapter short is.

English says This chapter is short, but Hindi usually follows this pattern:

subject + adjective/noun + है

So this sentence is completely normal Hindi word order.

Because अध्याय is a masculine singular noun, and छोटा is an adjective that changes form to agree with gender and number.

The adjective छोटा behaves like this:

• छोटा = masculine singular
• छोटी = feminine singular
• छोटे = masculine plural or masculine singular in some oblique contexts

Since अध्याय is masculine singular, the correct form is छोटा.

So:

• यह अध्याय छोटा है। = This chapter is short.
• यह किताब छोटी है। = This book is short/small.
  because किताब is feminine

You usually have to learn the gender of each Hindi noun as part of the word.

With अध्याय, the masculine agreement in the sentence gives it away:

• अध्याय छोटा है → masculine
• if it were feminine, you would expect छोटी

Not all Hindi nouns have obvious endings that make gender easy to predict, so it is very common for learners to memorize nouns together with their gender.

है is the present-tense form of to be for a singular subject in sentences like this. Here it means is.

So:

• यह अध्याय छोटा है। = This chapter is short.

A few related forms:

• है = is / am (in some contexts with मैं only in very formal grammar discussion, but normally मैं ... हूँ)
• हैं = are / is (respectful or plural)
• था / थी / थे = was / were

Hindi normally does not use articles like a, an, and the the way English does.

So यह अध्याय छोटा है can naturally mean:

• This chapter is short
• and depending on context, something like This chapter is the short one could also be possible, though that is not the most direct reading here

Usually context makes the meaning clear, and Hindi does not need a separate word for the.

A common pronunciation is:

yah adhyāy chhoṭā hai

A few notes:

• यह is often pronounced yah or yeh in everyday speech
• अध्याय is roughly adh-yaa-y
• छ in छोटा is an aspirated chh sound
• ट in छोटा is a retroflex ṭ, made with the tongue curled back a bit
• है is often pronounced a bit like hai / heh depending on accent and speed

Learners often hear यह sounding closer to येह in conversation, even though it is written यह.

In standard written Hindi, for singular this, use यह.

• यह अध्याय छोटा है। = This chapter is short.

ये is normally used for plural these in standard Hindi:

• ये अध्याय छोटे हैं। = These chapters are short.

However, in everyday speech many speakers pronounce यह somewhat like ये or येह, so learners often get confused. The important distinction is:

• standard writing: यह = this, ये = these
• casual speech: pronunciation can blur a little

You would change the demonstrative, adjective, and verb:

ये अध्याय छोटे हैं।
= These chapters are short.

Changes:

• यह → ये
• छोटा → छोटे
• है → हैं

So Hindi shows plural in several places, not just one.

Yes. छोटा can mean small, little, or short, depending on context.

Examples:

• छोटा घर = small house
• छोटी कहानी = short story
• यह अध्याय छोटा है = this chapter is short

Since a chapter is something with length, short is the most natural translation here.

Yes, अध्याय is a standard and very common word for chapter, especially in textbooks, literature, religious writing, and formal contexts.

Another word you may see is चैप्टर, borrowed from English, especially in casual speech or in some modern academic settings. But अध्याय is the more traditional and standard Hindi word.

So यह अध्याय छोटा है sounds perfectly natural and correct.

In full standard Hindi, you should keep है here:

यह अध्याय छोटा है।

In very casual speech, people sometimes drop forms of to be in certain contexts, but for learners it is best to include है. Leaving it out can sound incomplete or overly colloquial.

So the safe rule is:

• standard, correct sentence: यह अध्याय छोटा है
• do not omit है until you are very comfortable with informal spoken Hindi

छोटा is a variable adjective, meaning it changes form based on the gender and number of the noun.

Its basic forms are:

• छोटा for masculine singular
• छोटी for feminine singular
• छोटे for masculine plural

This is an important pattern in Hindi. Many common adjectives behave like this, for example:

• अच्छा / अच्छी / अच्छे = good
• बड़ा / बड़ी / बड़े = big

So learning छोटा in this sentence also helps you learn a very common Hindi grammar pattern.