Heat Energy Worksheet-2

Heat Energy Worksheet-2

1. A scientist took a metal rod and a wooden rod and wrapped each of them in a piece of paper. These were then heated as shown. It was found that the paper around the metal rod does not burn whereas the one around the wooden rod catches fire. It is because

(a) Iron being a good conductor, conducts away heat given to paper

(b) Wood being an insulator, takes away all the heat

(c) Candle in case of iron rod, is near to the paper

(d) Paper, in first case, it thicker

2. Deepak put twenty ice cubes of the same volume into four containers packed with different materials. He recorded the time taken for the ice to melt in each case. The table shows his results. Which of the boxes should he choose to carry ice that the needs to take to a friend’s house 120 km away?

(a) Container with thermocole: Melting time: 3 h 10 min

(b) Container with ice paper: Melting time: 2 h 0.5 min

(c) Container with sand: Melting time: 30 min

(d) Container with sawdust: Melting time: 1 h 15 min

3. Name the device which is used to measure the degree of coldness or hotness of an object.

(a) Mano meter                            (b) Barometer

(c) Thermometer                          (d) Voltmeter

4. What is temperature?

(a) Temperature is a measure of the total energy in an object

(b) Temperature is a measure of the degree of hotness or coldness in an object

(c) Temperature is when the object expands

(d) Temperature is when the object contracts

5. The process of transmission of heat energy in solids, without actual visible movement of particles, from their mean position is called:

(a) conduction                               (b) convection

(c) radiation                                  (d) Conduction or convection

6. Which of the following is not a conductor of heat?

(a) Silver            (b) Gold             (c) Graphite      (d) Mica

7. If the melting point of ice is 273 K, the freezing point of water is :

(a) less than 273 K                       (b) more than 273 K

(c) equal to 273 K                         (d) none of these

8. If boiling point of water is 373 K, then condensation point of water is:

(a) less than 373 K                       (b) 373 K

(c) more than 373 K                    (d) none of these

9. Potential energy due to gravitational force possessed by a body is given by the expression:

(a) Mgh              (b) mgl/h           (c) mgh²             (d) ½ gh

10. An aero plane flying high in the sky possesses :

(a) potential energy only

(b) kinetic energy only

(c) Both potential and kinetic

(d) none of these

Answer Key:

1. (a)
2. (a)
3. (c)
4. (b)
5. (a)
6. (d)
7. (c)
8. (b)
9. (a)
10. (c)