The desert sand is very hot in the day and very cold at night because the sand has____________
High specific heat
Low specific heat
High calorific value
Low calorific value
Some spark plugs in cars are nothing more than metal contacts shaped like a letter ‘C’ separated by a specific distance. A spark jumps the distance, called the gap between the electrodes. When the engine heats up, including the spark plug, what happens to the size of the gap?
It increases
It decreases
It increases at first, then decreases effectively cancelling out any change once the engine reaches the operating temperatures.
It decreases at first, then increases effectively cancelling out any change once the engine reaches the operating temperatures
The principle of pressure coefficient is used in the construction of__________________
Air thermometer.
Calorimeter
Manometer
Barometer
Which of the following expands most when the temperature is increased? Equal volumes of_______________
Helium.
Iron.
Wood
Ice water
Specific heat and calorific value of a substance are usually ________________
Same
Not same
Cannot be compared
None of these
Suppose you put a closed, sealed can of air on a hot stove burner. The contained air will undergo an increase in_______________
Pressure
Internal energy.
Temperature.
Temperature, pressure and internal energy .
What quantity of heat in kilo cal is required to raise the temperature of 450 grams of water from 15°C to 85°C? The specific heat capacity of water is 4.18 J/g/°C.
31500
31.5
131.67
13167
The lowest temperature possible in nature is_____________
0oC
– 273oC
0o
What is the heat absorbed by 200 ml of water at 20oC from your body at ( 37oC ) when you drink water?
3400 cal
4000cal
14212cal
4000J
Food cooked in boiling water at a mountain top cooks slower than when cooked at sea level. Ifthe temperature under the pot of boiling water is increased, the food will cook ____________
Faster at sea level
Faster at the mountain top.
Faster at both places.
Not differently than it did before the increase.