The freezing point on a thermometer is marked as `-20^(@)` and the boiling point as `130^(@)`. A temperature of human body `(34^(@)C)` on this thermometer will be read as

Options

A. `31^(@)`
B. `51^(@)`
C. `20^(@)`
D. None of these

Answer

To solve the problem, we need to determine how the temperature of the human body (34°C) will be represented on a thermometer that has a freezing point of -20°C and a boiling point of 130°C.

### Step-by-Step Solution:

1. **Identify the Scale Range**:
- The freezing point of water is marked as -20°C.
- The boiling point of water is marked as 130°C.
- Therefore, the range of the thermometer is from -20°C to 130°C.

2. **Calculate the Actual Temperature Range**:
- The actual temperature range for water is from 0°C (freezing point) to 100°C (boiling point).
- The thermometer shows a range of 130 - (-20) = 150°C.

3. **Determine the Scale Factor**:
- The actual temperature range (0°C to 100°C) corresponds to the thermometer range (-20°C to 130°C).
- The scale factor can be calculated as follows:
\[ \text{Scale Factor} = \frac{\text{Thermometer Range}}{\text{Actual Range}} = \frac{150}{100} = 1.5 \]

4. **Convert the Human Body Temperature**:
- To find out what 34°C will read on this thermometer, we apply the scale factor:
\[ \text{Reading on Thermometer} = \text{Actual Temperature} \times \text{Scale Factor} = 34 \times 1.5 = 51 \]

5. **Adjust for the Thermometer's Starting Point**:
- Since the thermometer starts at -20°C, we need to adjust the reading:
\[ \text{Final Reading} = 51 + 20 = 71 \]

### Conclusion:
The temperature of the human body (34°C) will be read as 71°C on the thermometer.