Warm air rises because it is

  • more dense than cool air
  • equally dense as cool air
  • less dense than cool air
  • completely dense

Quilts and jackets keep us warm by

  • trapping air
  • preventing release of heat from our body
  • heating itself up
  • maintaining body temperature

By placing our hand above a hot object, we can feel heat because

  • it is releasing heat
  • our hand is releasing heat
  • our hand is cooling down
  • our hand is heating up

At night, sea water gets

  • warm than land
  • cool than land
  • both a and b
  • very hot

Earth is warm by heat energy coming from

  • sun
  • moon
  • universe
  • space

When warm air rises over sea, its previous position is replaced by

  • more warm air from sea
  • cool air from sea
  • more cool air from land
  • warm air from land

The objects that are cooler than other objects gain heat from

  • sun
  • surroundings
  • stove
  • smoke releasing fuels

The color and texture of poor absorber of radiant heat is

  • black and shiny
  • black and dull
  • white and shiny
  • white and dull

The cool air which comes from sea to land is known as

  • sea breeze
  • land breeze
  • forward breeze
  • reverse breeze

Compared to hot air, cool air is

  • light
  • good conductor
  • more strong
  • more dense

Ideal temperature for warm bath water is usually between

  • 30 °C
  • 40 °C
  • 50 °C
  • 60 °C

Just like light, radiant heat can also be

  • reflected
  • turned off
  • used in LED
  • effective

In hot places, well insulated house stays

  • warm
  • hot
  • cool
  • normal

An example of conductor of heat is

  • paper
  • cloth
  • air
  • aluminum

Heat of an object is known as

  • thermometer
  • thermal energy
  • temperature
  • pressure

The temperature of horse shoe is approximately

  • 200 °C
  • 700 °C
  • 1000 °C
  • 2000 °C

If atmosphere doesn't act like greenhouse, the temperature of earth would become

  • too pleasant to enjoy
  • too cold to survive
  • too hot to survive
  • too terrible to survive

Infrared radiation can pass through

  • thick wall
  • glass
  • water
  • log

Waves that pass through the glass walls of greenhouse are in the form of

  • gamma rays
  • x-rays
  • infrared waves
  • radio waves

From earth, sun is about

  • 100 million km away
  • 125 million km away
  • 150 million km away
  • 175 million km away

In summer, people paint their cars with silver color in order to prevent

  • release of heat
  • absorption of heat
  • transfer of heat
  • strength of heat

The color and texture that are the best reflector of radiant heat are

  • black and shiny
  • white and shiny
  • black and dull
  • white and dull

Heat of sun that travels through vacuum is known as

  • conducting heat
  • convective heat
  • radiant heat
  • infrared heat

Black colored objects reflect

  • less heat
  • more heat
  • no heat
  • excessive heat

The rise of warm air and fall of cool air in order to fill the space forms a

  • radiation current
  • conduction current
  • convection current
  • air current

Greenhouse gases effect on earth's atmosphere is increased by

  • CFCs (chlorofluorocarbons)
  • air conditioners
  • perfumes
  • burning fossil fuels

If a substance is hot, its particles will

  • move fast than the cooler object
  • move slow than the cooler object
  • move as the cooler object
  • may move fast or slow than the cooler object

Handles of saucepans and other cooking utensils are

  • thermal conductors
  • thermal insulators
  • electrical conductors
  • metalloids

'Metals' are the best

  • insulators of heat
  • conductors of heat
  • conductors of light
  • insulators of electricity

Radiation is prevented by

  • glass walls
  • silver painted glass walls
  • black painted glass walls
  • metal walls
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