HEAT
IMPORTANT QUESTIONS OF PAST PAPERS:
1) Write two points of difference between heat and temperature (2009)2) State Boyle's law, Charles's law and write the formula of the general gas equation.(2009) OR
◾ State Boyle's law, Charles's law and Pressure law and derive PV = nRT (2011, 2013) OR
◾ Define Boyle's law and Charles's law and derive general gas equation PV = nRT(2019) OR
◾ State Boyle's law (2016) OR
◾ State Charles's law (2017)
3) Define:
(i) Coefficient of Linear Expansion (2009)
(ii) Specific Heat (2009, 2014)
4) State Law of Heat Exchange (2009)
5) Why is a gap left between two pieces of railway track.( Give scientific reason) ( 2009)
6) Define the Coefficient of linear thermal Expansion and Co-efficient of volumetric Expansion and write the relation between them. (2012)
7) What is bimetallic strip? Write its three application. ( 2014) OR
◾ What is bimetallic strip? Write the name of its two application. ( 2017)
8) Describe and derive general gas equation.(2015)◾ What is bimetallic strip? Write the name of its two application. ( 2017)
9) Write down three differences between heat and temperature? ( 2016)
10) Define anomalous expansion of water and give its two effects. ( 2016)
11) Derive the equation β = 3∝ ( 2016)
12) Draw a labeled diagram of refrigerator and also describe the working of its main parts? (2008)
13) Aquatic animal survive in frozen seas. (Given scientific reason) (2018)
14) Define Co-efficient of linear expansion and derive the relation L2 = L1 [1+ a T] (2018)
Numerical:
1) 117.6 J heat is required to raise the temperature of 10 gm of silver by 50 °C; Find the specific heat of silver. (2010) ( Hint: Formula ; C = 𝚫 Q / m 𝚫T )
2) How much heat is required to raise the temperature of 100 kg of iron through 10 °C? (Specific heat of iron is 499.8 J/kg °C) (2011) ( Hint: Formula ; 𝚫Q = mC𝚫t)
3) How much amount of heat is required to raise the temperature of 100 kg of water from 20 °C to 80 °C? (Specific heat of water is 4200 Joules) (2012) ( ( Hint: Formula ; 𝚫Q = mC𝚫t)
◾ Find the amount of heat is required to raise the temperature of 100 gm of water from 10 °C to 60 °C? (Sp. Heat of water is 4200 J/kg°C) (2019) ( ( Hint: Formula ; 𝚫Q = mC𝚫t)
4) How much heat is required to raise the temperature of 800 g of iron through 50 °C? (Specific heat of iron is 499.8 J/kg °C) (2013) ( ( Hint: Formula ; 𝚫Q = mC𝚫t)
5) Find the amount of heat required to convert 10 Kg ice at 0℃ into water without changing the temperature while latent heat of fusion of ice is 3366000 J/kg. (2014) ( Hint: Formula ; 𝚫Q = mass x latent heat of fusion)
6) A steel rod has a length of 10 m at a temperature of 25℃. Calculate the increase in length, if it is heated to 35℃ ( ∝ For steel = 1.1 x 10-5 K-1) (2015) (Hint: Formula ; 𝚫T = ∝L𝚫T)
7) Calculate the volume occupies by 2 moles of a gas at 27℃ and pressure of 1 atm = 1.01 x 105 N/m2 ( R= 8.314 J/ mol-K) (2015, 2017) (Hint: Formula ; PV = nRT )
8) What is the pressure of 200 moles of a gas in a 50 cm3 cylinder at 27℃ (2018) (Hint: Formula ; PV = nRT )
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