Consider the following statements
I.Noise causes psychological disorder in humans
II.Noise causes physiological disorder in humans
III.Noise is measurable unit in dB but sometimes it is measured in Dobson unit
IV.150 dB is tolerable for human
Which of the above statements are true?

Options

A. I and IV
B. I and II
C. I,ii and IV
D. I and III

Answer

To determine which statements about noise and its effects are true, let's analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement I: Noise causes psychological disorder in humans.**
- Noise pollution can lead to psychological issues such as anxiety, depression, and panic attacks. Therefore, this statement is **true**.

2. **Statement II: Noise causes physiological disorder in humans.**
- Noise pollution has been linked to various physiological disorders, including increased blood pressure, headaches, restlessness, and noise-induced hearing loss (NIHL). Thus, this statement is also **true**.

3. **Statement III: Noise is a measurable unit in dB but sometimes it is measured in Dobson unit.**
- Noise is indeed measured in decibels (dB). However, the Dobson unit is used for measuring ozone concentration, not noise. Therefore, this statement is **false**.

4. **Statement IV: 150 dB is tolerable for humans.**
- The human ear can tolerate around 70 dB comfortably, and exposure to sounds above 85 dB can lead to hearing loss. A sound level of 150 dB is extremely loud and can cause immediate harm. Hence, this statement is **false**.

### Conclusion:
Based on the analysis:
- Statement I: True
- Statement II: True
- Statement III: False
- Statement IV: False

Thus, the true statements are **I and II**.

### Final Answer:
The correct statements are **I and II**.

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