Temperature

Q.

What will be the temperature of the mixture when one litre of water at 30 degree Celsius is mixed with one litre of water at 50 degree Celsius? [2 MARKS]

Q.

What is the normal temperature of a human body?

1. 57 °C

2. 37 °F

3. 98.6 °C

4. 37 °C

Q.

What is the use of an alcohol thermometer?

1. Very high temperatures

2. Very low temperatures

3. It can measure both very high as well as very low temperatures

4. It can measure within a particular range of high temperature

Q. As temperature decreases, the kinetic energy of molecules ___.

1. becomes double the initial value
2. remains same
3. decreases
4. increases

Q.

Heat transfer in liquids and gases is by______.

Q.

The process of heat transfer that involves the movement of the particles of a liquid or a gas is called conduction.

1. True
2. False

Q.

What do you mean by heat? How is it measured? Which thermometer is used for measuring the human body temperature and how is it different? [5 MARKS]

Q.

_________ is a process of transfer of heat by the actual movement of the medium particles.

1. 
   

   Radiation

2. 
   

   Conductors

3. 
   

   Convection

4. 
   

   Conduction

Q. Is sense of touch the reliable measure of hotness or coldness of an object?

Q.

Convert the following Celsius temperature into Kelvin.

$127°\mathrm{C}$

Q. One should read the thermometer by keeping the level of mercury along the line of sight, in order to avoid ___.

1. damage to our eyes
2. reading the wrong value
3. fall of mercury level
4. tilting of our head

Q.

Which of the following is a reliable measure of hotness or coldness of a body?

1. Temperature

2. Observing the change in colour of the body

3. Our sense of touch

4. Dimension of the body

Q. Why touching and feeling the hotness of a body is not sufficient to measure temperature?

Q.

Explain the process by which the transfer of heat by convection occurs ?

Q. What is room temperature?
how to measure specific heat?

Q.

Neap tides occur when earth, sun and moon forms an angle of __.

1. >

2. <

3. None of these

4. =

Q. Which of the following shows a maximum rise in temperature?

1. $0{}^{\circ }$C to $10{}^{\circ }$C
2. $-4{}^{\circ }$C to $8{}^{\circ }$C
3. $-7{}^{\circ }$C to $0{}^{\circ }$C
4. $-15{}^{\circ }$C to $-8{}^{\circ }$C

Q.

The particles in a cold body are more active than the particles in a hot body.

1. True

2. False

Q. Four identical boxes, each made of wood, plastic, aluminium, and clay, are placed in an open field under plenty of sunlight. Which of these four boxes would be the hottest, after an hour?

1. Wood
2. Plastic
3. Aluminium
4. Clay

Q. Sort the following in decreasing order of temperature.

1. Core of Sun
2. Surface of Sun
3. Steam
4. Ice

Q. The normal temperature of human body is 98.6°C.

1. True
2. False

Q. A pair of plastic tongs is kept into a bowl of ice cubes. After sometime, what would happen to the tongs?

1. They become cold due to radiation.
2. They do not become cold easily.
3. They become cold due to conduction.
4. They become cold due to convection.

Q. A laboratory thermometer is a tool used in laboratories to measure temperature with high accuracy.

1. True
2. False

Q. Which of the following statement(s) is/ are true about convection?​

1. Convection requires a medium for transfer of heat.​

2. In liquids, the predominant mode of heat transfer is convection.​

3. In convection, heat flows from the cold end to the hot end of the substance.​

1. 1 and 3 only​
2. 1 and 2 only​
3. 1, 2 and 3​
4. 2 and 3 only​

Q. Differentiate between heat and temperature

Q.

Monsoon is a convection current that is formed because of temperature difference between ______ and ________.

Q. Choose the properties of mercury.

1. It is a poor conductor of heat
2. It is easily available in pure state
3. It does not stick to surface of the glass
4. Its expansion is non-uniform

Q.

An object A at 50 degree Celsius is kept in contact with an object B at 20 degree Celsius, in which direction will the heat flow and why

Q.

As the temperature of a gas increases, the volume occupied by the gas ___.

1. increases

2. decreases

3. remains constant

4. can increase or decrease

Q. Which of these is true about the direction of heat flow?

1. Heat flows from a hot body to a cold body.
2. Heat flows from a cold body to a hot body.
3. Heat flows from a greater height to a lower height.
4. Heat flows in a random manner.