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NEET 2016
Exam
NEET
Year
2016
Subject
Physics
Chapter
Thermodynamics

NEET 2016 · Physics · Thermodynamics

A refrigerator works between 4 ^ o C and 30 ^ o C . It is required...

A refrigerator works between 4oC{4}^{o}C and 30oC{30}^{o}C. It is required to remove 600\text{600} calories of heat every second in order to keep the temperature of the refrigerated space constant. The power required is:

(Take 1\text{1} cal = 4.2\text{4}\text{.2} Joules)A refrigerator works between 4 ^ o C and 30 ^ o C . It is required to remove 600 calories of heat every second in order

Options

  1. A2.365W2.365\text{W}
  2. B23.65W23.65\text{W}
  3. C236.5W236.5\text{W}
  4. D2365W2365\text{W}

Correct answer

C. 236.5W236.5\text{W}

Step-by-step solution

A refrigerator works between 4 ^ o C and 30 ^ o C . It is required to remove 600 calories of heat every second in order

Q2Q1=T2T1⇒600+w600=303277=277+26277\dfrac{{Q}_{2}}{{Q}_{1}} = \dfrac{{T}_{2}}{{T}_{1}} ⇒ \dfrac{600 + w}{600} = \dfrac{303}{277} = \dfrac{277 + 26}{277}

1+w600=1+262771 + \dfrac{w}{600} = 1 + \dfrac{26}{277}

w=600×26277×4.2w = 600 \times \dfrac{26}{277} \times 4.2

w=236.5w = 236.5
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