A $10 \mathrm{~kW}$ drilling machine is used to drill a bore in an aluminium block of mass $25 \mathrm{~kg}$. If the machine is on for 3 minutes and $50 \%$ of the heat liberated is taken up by the block, then the raise in temperature of the block is (specific heat of aluminium is $900 \mathrm{~J} \mathrm{~kg}^{-1} \mathrm{~K}^{-1}$ )

• A

  $20^{\circ} \mathrm{C}$
• Correct answer
  B

  $40^{\circ} \mathrm{C}$
• C

  $85^{\circ} \mathrm{C}$
• D

  $150^{\circ} \mathrm{C}$

Hence, the correct answer is option: 'B'.