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ICSE Class 10 Physics Question 5 of 20

Solved 2020 Question Paper ICSE Class 10 Physics — Question 17

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17
Question

Question 4(b)

Two metallic blocks P and Q having masses in ratio 2 : 1 are supplied with the same amount of heat. If their temperatures rise by same degree, compare their specific heat capacities. [2]

Answer

Let mass of block P = mp and mass of block Q = mQ

Given,

mpmQ\dfrac{m_p}{m_Q} = 21\dfrac{2}{1}

Q = m x s x ∆t

Since, heat supplied (∆Q) and rise in temperature (∆t) is same for both block P and Q,

Therefore,

mp×sp×∆t=mQ×sQ×∆tmp×sp=mQ×sQspsQ=mQmp=12m_p \times s_p \times ∆t = m_Q \times s_Q \times ∆t \\[0.5em] m_p \times s_p = m_Q \times s_Q \\[0.5em] \dfrac{s_p}{s_Q} = \dfrac{m_Q}{m_p} = \dfrac{1}{2}

Therefore, sP : sQ = 1 : 2