The length of the mercury column in a non-calibrated mercury thermometer is 2cm when its bulb
is immerse in melting ice and 20cm when the bulb is in steam above boiling water. What would the
temperature be is the length of the mercury column is 11cm?
The length of the alcohol column in a thermometer is 2.5cm and 17.5cm when the thermometer is dipped into a melting ice and a boiling water respectively. Find the distance between every 10°C of the scale on the thermometer.
Answer
2.0 cm
1.5 cm
3.6 cm
Question 3
Question
The Angel Falls in Venezuela is 979 m in height. Calculate the rise in temperature of the water when the water fall from the top to the bottom. (Assume that all the potential energy loss of the water is converted to heat) [The specific heat capacity of water is 4200Jkg-1K-1]
A 2.5g lead bullet is moving at 200 m/s when it strikes a wooden block and is brought to rest. If all the kinetic energy is transferred to thermal energy in the bullet, find the rise in temperature of the bullet. [The specific heat capacity of lead is 130Jkg-1K-1]
An electric heater supplies 2.5 kW of power in the form of heat to a tank of 0.02m³ of water. How long will it take to heat the water from 25 °C to 70 °C? Assume heat losses to the surroundings to be negligible. [Density of water = 1000kg/m³; The specific heat capacity of water is 4200Jkg-1K-1]
Answer
66009 s
1512 s
123 s
Question 6
Question
A 0.5 kg block of aluminium at a temperature of 100 °C is placed in 1.0 kg of water at 20 °C. Assuming that no thermal energy is lost to the surroundings, what will be the final temperature of the aluminium and water when they come to the same temperature? [The specific heat capacity of water is 4200 Jkg-1K-1 and The specific heat capacity of aluminium is 900 Jkg-1K-1]
What will be the final temperature if 50 g of water at 0 °C is added to 250 g of water at 90 °C?
Answer
77 degree celcius
75 degree celcius
75 . 3 degree celcius
Question 8
Question
How much heat energy is required to change 2 kg of ice at 0°C into water at 20°C? [Specific latent
heat of fusion of water = 334 000 J/kg; specific heat capacity of water = 4200 J/(kg K).]
Answer
836000J
600000J
567800J
Question 9
Question
How much heat must be removed by a refrigerator from 2 kg of water at 70 °C to convert it to ice
cubes at -11°C? [Specific heat capacity of water = 4200J kg-1 °C-1; Specific latent heat of fusion
of ice = 334,000 Jkg-1, specific heat capacity of ice = 2100 J/(kg K)]
Answer
1,302,200J
4,500,600J
Question 10
Question
An iron cylinder containing gas with pressure 200kPa when it is kept is a room of temperature 27°C.
What is the pressure of the gas when the cylinder is located outdoor where the temperature is 35°C.
Answer
398kPa
205kPa
245kPa
Question 11
Question
A fish releases a bubble of air of volume 1cm³ at the bottom of a lake. The depth of the lake is 10m. Find the volume of the bubble when it reaches the surface of the pond. (Assume that the atmospheric pressure is equal to 10m of water)