In basic music knowledge, which musical instrument among the following has a combination of keys, pedals, and strings used together to produce sound?

Introduction / Context:
This question checks your awareness of common musical instruments and their construction. In many competitive exams, simple questions are asked about the physical features of instruments, such as whether they have strings, keys, or pedals. Knowing the basic structure of popular instruments helps you answer these quickly and confidently.

Given Data / Assumptions:

• We are asked to identify an instrument that has keys, pedals, and strings together.
• The options are Piano, Guitar, Violin, and Tumbra.
• We assume these refer to standard versions of these instruments as commonly used in classical and popular music.

Concept / Approach:
To solve the question, we recall the basic design of each instrument. A piano is a large keyboard instrument in which pressing keys causes internal hammers to strike strings, and pedals are used to sustain or soften the sound. A guitar and a violin are string instruments played by plucking or bowing and do not have keys and pedals in the standard form. Tumbra is another stringed instrument but again lacks the typical combination of piano-style keys and foot pedals.

Step-by-Step Solution:
Step 1: Recall that a piano has a long row of keys on the keyboard.Step 2: Remember that inside the piano there are many tightly stretched strings which vibrate when struck by hammers.Step 3: Note that a piano usually has at least two or three pedals at the bottom, controlled by the feet, to change sustain and tone.Step 4: Compare this with a guitar, violin, and tumbra, which may have strings and sometimes additional mechanisms, but do not normally involve a full keyboard plus multiple pedals.Step 5: Conclude that the only instrument that clearly fits all three features together is the piano.

Verification / Alternative check:
Looking at any diagram or description of a piano confirms the presence of keys, internal strings, and pedals. Beginners learning piano are usually taught how the keys trigger hammers and how pedals such as the sustain pedal affect the sound. This makes the piano a classic example of a keyboard-string instrument with pedals and leaves no doubt about the answer.

Why Other Options Are Wrong:
Guitar: It has strings and sometimes electronic controls but no full set of keys and no standard pedals as part of the instrument body.Violin: It is a bowed string instrument without keys or pedals.Tumbra: Also a string instrument, usually plucked, with no keyboard or pedal setup like a piano.

Common Pitfalls:
Some students may think of electronic guitars with effect pedals or keyboard-like instruments, but the question is about the instrument itself, not external equipment. Always focus on the basic physical design of the instrument rather than accessories connected to it. Paying attention to such details prevents confusion in similar questions.

Final Answer:
The musical instrument that has keys, pedals, and strings together is the Piano.