Tag: thermal expansion in solids, liquids and gases

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Questions Related to thermal expansion in solids, liquids and gases

Multiple choice physics heat and temperature anomalous expansion of water thermal expansion in solids, liquids and gases thermal expansion

The holes through which the fish plates are fitted to join the rails are oval in shape because :

  1. bolts are in oval shape

  2. to allow the movement of rails in the direction of length due to change in temperature

  3. to make the fitting easy and tight

  4. only oval shape holes are possible
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A fishplate is a metal bar that is bolted to the ends of two rails to join them together in a track. Because of friction between wheel and rails temperature increases. Thus a thermal expansion on rails happens. So, if rails are joined one after another without keeping any gap between them, the rails may bend. The holes through which the fish plates are fitted to join the rails are oval in shape to give sufficient space for length of the rails to increase. 

Multiple choice physics heat and temperature anomalous expansion of water thermal expansion in solids, liquids and gases thermal expansion

A piece of glass is heated to a high temperature and then allowed to cool. If it cracks, a probable reason for this is the following property of glass :

  1. Low thermal conductivity

  2. High thermal conductivity

  3. High specific heat

  4. High melting point
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In case of low thermal conductivity, the heat is not distributed properly. When it is heated, the temperature at its outer  surface increases more than in the inner part. This means expansion on the outer part will be more than the inner part. So a stress will be generated. If the body is cooled again, the outer surface will contract more rapidly, then the inner part. This stress will generate crack in the body.

Multiple choice physics heat and temperature anomalous expansion of water thermal expansion in solids, liquids and gases thermal expansion

Which of the following would expand more on heating?

  1. Carbon dioxide

  2. Hydrogen peroxide

  3. Calcium hydroxide

  4. Calcium carbonate
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In room temperature, carbon dioxide is gas, hydrogen peroxide is liquid, calcium hydroxide is solid and calcium carbonate is solid.

Gases expand more because of large intermolecular distance and weak intermolecular force.

Multiple choice physics heat and temperature anomalous expansion of water thermal expansion in solids, liquids and gases thermal expansion

Wires on electric poles are mounted tightly, in winter.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
As due to their linear coefficient of expansion
$\alpha =\cfrac { 1 }{ L } \cfrac { dL }{ dT } $
the wires will get a bit loose when summer comes, so they are safe. If they are loosely mounted in winters then as when summer comes, they will become more loose and can cause accidents.
Multiple choice physics heat and temperature anomalous expansion of water thermal expansion in solids, liquids and gases thermal expansion

While laying the railway tracks on wooden plank,a small gap is left between the successive lengths of rail because

  1. It no gap is left, the expansion of rails will cause them to bend sideways

  2. If no gap is left, the expansion will break the rails

  3. If no gap is left, rails decrease in length

  4. All
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The rails of railway tracks are made up of steel.in summer,due to considerable rise in atmospheric temperature, the rails tend to increase in length,so they bend sideways if they are not allowed to increase in length.therefore while laying the railway tracks on wooden plank,a small gap is left between the successive lengths of rail.

Multiple choice physics heat and temperature anomalous expansion of water thermal expansion in solids, liquids and gases thermal expansion

Pouring hot water to open the tightly closed lid is an application of : 

  1. Thermal expansion in liquid

  2. Thermal expansion in solid

  3. Thermal expansion in gas

  4. Thermal expansion in both solid and liquid
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When we pour hot water on a tightly closed lid, it expands due to heat gained from hot water. Due to this heat lid expands and becomes loose. This is thermal expansion of solids.

Multiple choice physics heat and temperature anomalous expansion of water thermal expansion in solids, liquids and gases thermal expansion

Why the telephone and electrical cables are strung out a little loose between the poles?

  1. To transfer high voltage current.

  2. To prevent contraction and snapping of the wire during winter.

  3. To avoid confusion in connecting the wires

  4. To avoid congestion over poles
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When a solid gets heat it expands and on cooling it contracts. Due to this electrical and telephone cables are strung out a little loose so that in winter, as cables contract due to cooling of atmosphere and snapping may occur, can be avoided. 

Multiple choice physics heat and temperature anomalous expansion of water thermal expansion in solids, liquids and gases thermal expansion

There are two spherical balls A and B of the samematerial with same surface, but the diameter of A is half that of B. If Aand B are heated to the sametemperature and then allowed to cool, then 

  1. Rate of cooling is same in both

  2. Rate of cooling of A is four times that of B

  3. Rate of cooling of A is twice that of $\mathrm { B }$

  4. Rate of cooling of A is 1$/ 4$ times that of $\mathrm { B }$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Rate of cooling is proportional to Surface Area / Volume. For a sphere, SA/V = 3/r. Since diameter of A is half of B, radius of A is half of B, so SA/V for A is twice that of B.

Multiple choice physics heat and temperature anomalous expansion of water thermal expansion in solids, liquids and gases thermal expansion

why Loops are joined with the metal pipe line?

  1. capacity

  2. temperature

  3. pressure

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Metals has the capacity to expand or contract due to temperature change. Metals pipe also expand in summer and contract in winter, such changes can cause deformities, inorder to avoid this, loops are joined with the metal pipe.