Using the information given in the graph, what conclusion may be reached about black surfaces?Black surfaces are good at absorbing and emitting infrared radiation.Black surfaces are poor at thermal conduction.Black surfaces are good at conducting electricity.Black surfaces are poor at absorbing and emitting infrared radiation.

Which of the following statement about radiant heat is/are not correct?I. Radiant heat cannot travel through a vacuumII. Rough surfaces emit radiant energy better than polish surfacesIII. Dark surfaces absorb radiant heat better than bright surfaces

Design an investigation to explore how the colour of a surface affect the heat radiated by it. In your report you should include: A research questionA suitable hypothesisVariable manipulationMaterial and method

Emissivity of perfectly black body isA) A) A) A)C) C) C) C)2- Work done will be maximum when angle between Force anddisplacement isA) 180 B) 60C) 90 D) 03- Energy transforming process that occur within an organism are namedasA) A) A) A)C) C) C) C)4-________ is equal to the amount of current multiplied by the resistanceA) Potential B) Potential DifferenceC) Charge D) Current5- Two long current carrying wires attract each other when currents are in_____.A) Opposite Direction B) Same DirectionC) Parallel Direction D) SeriesSection IV – Computers1- MS-DOS hasA) Command Line Interface B) Graphical User InterfaceC) Menu Line Interface D) Utility Driven Interface2- Identify the device through which data and instructions are entered into acomputer?A) Software B) Input DeviceC) Output Device D) Memory3- (35)10= ( )2?A) 100011 B) 110011C) 100001 D) 1110014- Arrange in descending order the units of memory TB, KB, GB, MBA) TB>MB>GB>KB B) MB>GB>TB>KBC) TB>GB>MB>KB D) GB>MB>KB>TB5- The term _______ is used to refer to a row.A) Attribute B) TupleC) Instance D) Field

Question 13 of 251083%True or false? When two objects are touching, the material the surface is made from does not effect the rate at which the object transfers energy by heating.

Which of the following is a TRUE statement about heat transfer:A) If an object is a good absorber of radiation, it is a poor emitter of radiation.B) Humans constantly radiate and absorb thermal radiation but on average, in winter, they radiate more heat than they absorb.C) Heat transfer by thermal radiation propagates slower than thermal conduction.D) Heat transfer by conduction propagates at speed of light.E) Convection takes place in gases and solids.F) Radiation needs medium to propagate.