1) Thermal energy travels through space from the Sun to the Earth. Space is a vacuum. How is thermal energy transferred from the Sun to the Earth? a) A. by conduction only  b) B. by convection only c) C. by radiation only d) D. by convection and radiation 2) The thermal heat capacity of solid Y is greater than that of solid Z. What is a consequence of this? a) Solid Y needs less thermal energy to melt it than solid Z.  b) Solid Y needs less thermal energy to raise its temperature by 1°C than solid Z. c) Solid Y needs more thermal energy to melt it than solid Z. d) Solid Y needs more thermal energy to raise its temperature by 1°C than solid Z. 3) A man holding a starting pistol stands 640 m away from a spectator. The spectator hears the sound of the starting pistol 2.0 s after seeing the flash from the pistol. Using this information, what is the speed of sound in air? a) 160 m/s b) 320 m/s c) 640 m/s d) 1280 m/s 4) A magnet is placed on a balanced. The balance reading changes when an iron bar or another magnet is held close to the first magnet. The arrangements are shown in the diagrams. a) Option A b) Option B c) Option C d) Option D

Fisika Kls 8

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