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

1. 1. Low thermal conductivity

   
   
   

   2. High thermal conductivity

   
   
   

   3. High specific heat

   
   
   

   4. Low specific heat

   
   
   

---

1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: A

   N/A

---

137. A piece of metal and a piece of wood are kept at temperature of 45°C on touching the two of them with hand

1. 1. The two will appear equally hot

   
   
   

   2. The piece of wood will appear hotter than the piece of metal

   
   
   

   3. The piece of metal will appear hotter than the piece of wood

   
   
   

   4. The distinction in the hotness will not be possible

   
   
   

---

1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: C

   N/A

---

---

138. A solid sphere of radius R and a hollow sphere of inner radius R / 2 and outer radius R, made of copper, are heated to the same temperature and are allowed to cool in the same environment. Then

1. 1. Hollow sphere cools faster

   
   
   

   2. Both the spheres attain room temperature at the same time

   
   
   

   3. Solid sphere cools faster

   
   
   

   4. None of the above

   
   
   

---

1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: A

   N/A

---

139. A solid cube and solid sphere of the same material have equal surface areas. Both are at the same temperature of 120° C then

1. 1. Both of them will cool down at the same rate

   
   
   

   2. The cube will cool down faster than the sphere

   
   
   

   3. The sphere will cool down faster than the cube

   
   
   

   4. None of the above

   
   
   

---

1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: B

   N/A

---

---

140. A glass container cracks when very hot tea is poured into it. A probable reason for this is the

1. 1. Low thermal conductivity of glass

   
   
   

   2. High thermal conductivity of glass

   
   
   

   3. Low specific heat of glass

   
   
   

   4. None of the above

   
   
   

---

1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: A

   N/A

---