Heat Energy

Heat Energy Worksheet-7

1. Heat causes expansion because

(a) Heat occupies space

(b) Of increase of movement of molecules

(c) Matter tries to escape from the heat

(d) None of these

2. A thermos flask prevents loss or gain of heat by

(a) Conduction only                     (b) Convection only

(c) Radiation only                        (d) All of these

Heat Energy Worksheet-8

1. In summer, people wear white clothes because white clothes are :

(a) good reflectors of heat

(b) good absorbers of heat

(c) poor absorbers of heat

(d) Good reflector or poor absorbers of heat

2. While laying electric wires for transmission during winter the wires are fixed :

(a) very tightly

(b) slightly loose

(c) no effect of tight or loose wires

(d) none of these