(a) Atmospheric temperature after a hailstorm is greater than the temperature during the hailstorm. State True or False.
(b) Which thermal physical quantity of a frying pan changes by making its base heavier?
(c) State the principle of Calorimetry.
(a) False
Explanation:
After the hailstorm, ice absorbs the heat energy required for melting from the surroundings, so the temperature of the surroundings falls further.
(b) Making the base heavier increases its heat capacity because heat capacity depends on mass.
(c) The principle of calorimetry states that when a hot body is brought in contact with a cold body, heat lost by the hot body equals heat gained by the cold body, provided there is no heat loss to the environment.
More ICSE Moderate level questions
Equal masses of substances A, B and C, each at its melting point, take 5 minutes, 7 minutes and 3 minutes respectively to melt when heated at the same rate. Which has the highest specific latent heat of fusion? (a) A (b) B (c) C (d) All are equal
Complete the following by choosing the correct answers from the bracket: (a) A car is moving in uniform circular motion. The direction of friction between the tyres and the path is ............... [towards the centre / tangential to the path]. (b) When a ray of light passes from a denser to a rarer medium, its wavelength ............... [decreases / increases]. (c) The lid of a calorimeter minimises heat loss by ............... [convection / radiation]. (d) Quality of sound depends on its ............... [amplitude / waveform]. (e) A substance whose resistance becomes almost negligible at a temperature near absolute zero is called a ............... [semiconductor / superconductor]. (f) ............... radiation deviates minimum in a magnetic field [Alpha / Beta].
The given graph represents the cooling curve of a liquid. (a) State the freezing temperature of the liquid. (b) Name the phase change happening at the region QR. (c) In which state (solid / liquid) does the above substance liberate heat at a faster rate? Justify.
A metal piece of thermal capacity 40 J K−1 absorbs 800 J of heat. Calculate the rise in the temperature of this metal piece.
When the length of a stretched metallic wire is doubled, its specific heat: (a) becomes double (b) becomes four times (c) becomes one-fourth (d) remains the same
Calculate the total amount of heat energy required to melt 200 g of ice at 0°C to water at 100°C. (Specific latent heat of ice = 336 J g−1, specific heat capacity of water = 4.2 J g−1 °C−1)
(a) State the principle of calorimetry. (b) Name the material used for making a calorimeter. (c) Write one characteristic property of the material chosen for making a calorimeter.
(a) Why does it become pleasantly warm when the lakes start freezing? (b) Water freezes to form ice. What change would you expect in the average kinetic energy of the molecules? (c) Which will contain more heat energy 1 g of ice at 0°C or 1 g water at 0°C?
85 g of water at 30°C is cooled to 5°C by adding certain mass of ice. Find the mass of ice required. [Specific heat capacity of water = 4.2 J g−1 °C−1, Specific latent heat of fusion = 336 J g−1]
30 g of ice at 0°C is used to bring down the temperature of a certain mass of water at 70°C to 20°C. Find the mass of water. Specific heat capacity of water = 4.2 J g⁻¹ °C⁻¹ and specific latent heat of ice = 336 J g⁻¹.
(a) A certain amount of heat will warm 1 g of material X by 10°C and 1 g of material Y by 40°C. Which material has higher specific heat capacity? (b) Which material, X or Y, would you select to make a calorimeter? (c) The specific heat capacity of a substance remains the same when it changes its state from solid to liquid. State True or False.
A metal piece of mass 5 g has thermal capacity 2.5 J K⁻¹. If the mass of the metal is tripled, then its specific heat capacity will be : (a) 7.5 J K⁻¹ (b) 2.5 J K⁻¹ (c) 1.5 J g⁻¹ K⁻¹ (d) 0.5 J g⁻¹ K⁻¹
