UNIT (2) Oct. Exam

at max. Height Potential energy is

• max.

• mini.

• zero

• equals to K.E

heart transfers between solids by

• conduction

• convection

• radiation

• conduction & convection

heat of the sun transfers in space by

• convection only

• radiation only

• convection & radiation

• conduction

by increasing the weight to double what happens to potential energy (if the height is constant)

• remains constant

• decreases to half

• increases 4 times

• increases to double

........................ is from energy forms

• fuel

• sun

• water

• light energy

it is a permanent source of energy

• oil

• water

• sun

• wind

loudspeakers causes ...............

• soil pollution

• noise pollution

• chemical pollution

• destruction

if an object is at rest, so its kinetic energy will be.........

• max.

• mini.

• zero

• equal to P.E.

In car engine ....................... energy is converted into .................... energy

• electric --> kinetic

• kinetic --> electric

• heat --> chemical

• chemical --> Heat

A racing bike is moving at a speed 50m/sec and mass 2 kg calculate K.E.

• 5200 joule

• 2500 joule

• 50 joule

• 5000 joule