Tag: physics

Questions Related to physics

Name the device which is used to measure temperature.

physics heat application of various thermometric scales different types of thermometers measuring temperature

  1. Caloriemeter

  2. Thermometer

  3. Vermier calliper

  4. None

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Correct Option: B
Explanation:

Thermometer is used to measure temperature. The degree of hotness or coldness of a body is temperature.

$10$grams of hydrogen gas and $40$ grams of helium gas are mixed in a closed vessel. Heat that has to be supplied to the gas raise its temperature by $50^oC$ is

physics temperature and heat application of various thermometric scales different types of thermometers measuring temperature

  1. $2750$J

  2. $2750$cal

  3. $2000$cal

  4. $2000$J

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Correct Option: A

To mark a temperature scale on a thermometer, standard temperatures knows as fixed points are needed.
Which of these is a fixed point on the Celsius scale?

physics temperature and heat application of various thermometric scales different types of thermometers measuring temperature

  1. room temperature

  2. the temperature inside a freezer

  3. the temperature of pure melting ice

  4. the temperature of pure warm water

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Correct Option: C
Explanation:

To define the Celsius temperature scale two "reliable" temperatures are used. These are, the melting point of pure ice, which gives us the lower fixed point of the scale and the boiling point of pure water (at atmospheric pressure) which gives us the upper fixed point.

The range of clinical thermometer is

physics measurement and effects of heat application of various thermometric scales different types of thermometers measuring temperature

  1. $37^{o}C$ to $42^{o}C$

  2. $95^{o}F$ to $110^{o}F$

  3. $90^{o}F$ to $112^{o}F$

  4. $95^{o}C$ to $104^{o}C$

Show answer
Correct Option: A
Explanation:

The clinical thermometer is a specially designed thermometer to measure the body temperature. The range of a clinical thermometer is centred around the human body temperature around $37^oC \ to \ 42^oC$.

A thermometer is used to measure

physics measurement and effects of heat application of various thermometric scales different types of thermometers measuring temperature

  1. heat

  2. thermal capacity

  3. water equivalent

  4. temperature

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Correct Option: D
Explanation:

Temperature is measured by a thermometer

A mercury thermometer, with a concave reflector behind the bulb, is placed in front of an electric fire. Which of the following combinations will cause the smallest reading on the thermometer?

physics temperature and heat application of various thermometric scales different types of thermometers measuring temperature

  1. Black reflector, black bulb

  2. Black reflector, shiny bulb

  3. Shiny reflector, shiny bulb

  4. Remains same

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Correct Option: B
Explanation:

A mercury thermometer, with a concave reflector behind the bulb, is placed in front of an electric fire.Black reflector, shiny bulb combinations will cause the smallest reading on the thermometer The black coating absorbs energy and warms up and warms the bulb by conduction.

A________is used to measure temperature

physics heat - measurement application of various thermometric scales different types of thermometers measuring temperature introduction to temperature

  1. Thermometer

  2. Barometer

  3. Manometer

  4. None of these

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Correct Option: A
Explanation:

A thermometer is a device that measures temperature or a temperature gradient. A thermometer has two important elements: (1) a temperature sensor (e.g. the bulb of a mercury-in-glass thermometer or the digital sensor in an infrared thermometer) in which some change occurs with a change in temperature, and (2) some means of converting this change into a numerical value (e.g. the visible scale that is marked on a mercury-in-glass thermometer or the digital readout on an infrared model). Thermometers are widely used in industry to monitor processes, in meteorology, in medicine, and in scientific research

Water is better thermometric liquid

physics heat - measurement application of various thermometric scales different types of thermometers measuring temperature introduction to temperature

  1. True

  2. False

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Correct Option: B
Explanation:

The above statement is false.

Water can't be used as thermometric liquid as:
(i) It sticks to the glass
(ii) It is transparent, and hence difficult to read its level through 
(iii) It is volatile and hence vapors apply pressure on the surface thereby affecting reading
(iv) It is a poor conductor of heat.
(v) its expansion is not uniform.
(vi) It freezes at 0°C and boils at 100°C and hence range is not very wide.

State whether given statement is True or False
Thermometer measures the heat energy in a body

physics heat - measurement application of various thermometric scales different types of thermometers measuring temperature introduction to temperature

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

A thermometer is a tool that measures temperature — how hot or cold something is.Made up of thermo (heat) and meter (measuring device), the meaning of the word thermometer is pretty straightforward. Thermometers measure temperatures in degrees, according to either the Celsius or Fahrenheit system.

Thermometer measures the temperature of body

State whether true or false.
Thermometer is an instrument used for measuring the temperature of a body

physics heat - measurement application of various thermometric scales different types of thermometers measuring temperature introduction to temperature

  1. True

  2. False

Show answer
Correct Option: A
Explanation:
A Thermometer is a device. which measures the temperature of the body it is brought in contact with.
Hence, OPTION : A (true).