PASSAGE-I: Human ears can pick up sounds ranging in amplitude (loudness) from 10 dB to 180 dB. A sound is considered to be normal if it is between 50 dB to 60 dB. Sounds above 80 dB are painful and cause various health problems.
Which of the following sounds human can hear, comfortably?

Options

A. 95 dB
B. 60 dB
C. 100 dB
D. 180 dB

Explanation

To determine which sound humans can hear comfortably based on the information provided in the passage, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Decibel Scale**: The passage states that human ears can detect sounds ranging from 10 dB to 180 dB. Sounds are measured in decibels (dB), which indicate the loudness of the sound.

2. **Identify Normal Hearing Range**: According to the passage, sounds are considered normal if they fall between 50 dB and 60 dB. This means that sounds within this range are comfortable for humans to hear.

3. **Determine Painful Sound Levels**: The passage also mentions that sounds above 80 dB can be painful and may cause health problems. Therefore, sounds above this level are not comfortable for humans.

4. **Evaluate the Given Options**:
- **Option 1: 95 dB** - This is above 80 dB, so it is considered painful and not comfortable.
- **Option 2: 60 dB** - This is within the normal range (50 dB to 60 dB), so it is comfortable for humans to hear.
- **Option 3: 100 dB** - This is also above 80 dB, making it painful and uncomfortable.
- **Option 4: 180 dB** - This is far above 80 dB and would be extremely painful, thus not comfortable.

5. **Conclusion**: The only sound level that humans can hear comfortably from the options provided is **60 dB**.

### Final Answer:
The sound that humans can hear comfortably is **60 dB**.

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