Temperature Scales: Celsius, Kelvin, and Fahrenheit

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Why is mercury used in the medical thermometer instead of alcohol?

Mercury expands more than alcohol with temperature changes.

Mercury has a clear color for easy visibility. (correct)

Mercury has a low cohesive force.

Mercury has a high adhesion force with glass.

What is the purpose of having a thin capillary in a fever thermometer?

To prevent the mercury from rising too high.

To increase the sensitivity of the thermometer. (correct)

To make the thermometer delicate.

To make the thermometer more durable.

How do thermistors differ from regular resistors?

Thermistors have negative temperature coefficients of resistance. (correct)

Thermistors are made of metal.

Thermistors do not change resistance with temperature.

Thermistors are not used for temperature sensing.

Why are thermistors considered highly sensitive temperature sensors?

They can detect temperature changes as little as 0.01°C. (D) Signup and view all the answers

What causes the mercury to rise higher per degree in a precise thermometer?

The low diameter of the capillary tube. (C) Signup and view all the answers

What gives thermistors their name?

It is a combination of 'thermal' and 'resistor'. (D) Signup and view all the answers

Why do thermistors have rapid response times?

As a result of their small heat capacities (B) Signup and view all the answers

How does the small size of thermistors benefit their usage in monitoring blood temperature?

It enables insertion into blood vessels for monitoring (A) Signup and view all the answers

What is the advantage of a thermistor when measuring temperature change?

It is very sensitive and can measure small changes in temperature (B) Signup and view all the answers

Why are thermistors used to monitor breathing rate, also known as pneumography?

As they are very sensitive and fast at measuring temperature change (D) Signup and view all the answers

What is the purpose of a thermograph in healthcare applications?

To produce thermal images based on infrared radiation emitted by the body (C) Signup and view all the answers

How are results from thermography typically displayed?

On a TV screen using color representation for different temperatures (A) Signup and view all the answers

What is the physical basis for the conductive method of producing heat in the body?

Heat transfer by conduction from warmer to cooler objects (A) Signup and view all the answers

Which physical factor does NOT influence the total heat transferred in the conductive method?

Time of day (C) Signup and view all the answers

What is the primary effect of conduction heat transfer on tissues?

Local surface heating (D) Signup and view all the answers

Which type of heat is used for surface heating of the body?

Radiant heat (A) Signup and view all the answers

What are the man-made sources of radiant heat mentioned in the text?

Glowing wire coils and 250W incandescent lamps (D) Signup and view all the answers

How deep do IR wavelengths penetrate the skin according to the text?

~3mm (A) Signup and view all the answers

How does the coil in the first method generate heat in the body?

By producing an alternating magnetic field (A) Signup and view all the answers

What type of energy is utilized in microwave diathermy?

Electromagnetic energy (B) Signup and view all the answers

Which condition is microwave diathermy commonly used to treat?

Fractures (D) Signup and view all the answers

Why are ultrasonic waves useful for depositing heat in bones?

Bones absorb ultrasonic energy effectively (C) Signup and view all the answers

Which body part is the 'pancake' coil often placed near in the first method described?

Back (B) Signup and view all the answers

What frequency is commonly used in microwave diathermy for therapy?

900 MHz (D) Signup and view all the answers

What is the freezing point of water in Fahrenheit?

32 F (B) Signup and view all the answers

How many parts is the interval between the freezing and boiling points of water divided into on the Fahrenheit scale?

180 parts (A) Signup and view all the answers

What is the freezing point of water in Kelvin?

0 K (A) Signup and view all the answers

Which temperature scale is commonly used in science?

Kelvin scale (B) Signup and view all the answers

What is the principle behind thermometers' functioning?

Different materials expand differently with a rise in temperature (C) Signup and view all the answers

What is the unit of measurement for temperature differences that is the same in both kelvins and degrees Celsius?

Kelvin (C) Signup and view all the answers