The wire of a platinum resistance thermometer has d resistance of 3.5Ω at 0 °C and 10.52Ω at 100°C. Calculate the temperature of the wire when its resistance is 7.5Ω.
A. 78 °C B. 25 oC C. 30oC D. 57 oC Correct Answer: Option D Explanation Using the formula t = R−R0/R(100)−R0×100oC t = 7.5−3.5/10.5−2..5×100oC = 47×100 = 57.14oC ~ 57oC
Calculate the quantity of heat needed to change the temperature of 60g of ice at 0 °C to 80 °C. [specific latent heat of fusion of ice= 3.36 x 105 Jkg‾¹ specific heat capacity of water 4.2 x 10³ J kg‾¹ K‾¹]
A. 4.80 kJ B. 20.16 kJ C. 40.32 kJ D. 22.17 kJ Correct Answer: Option C = 40.32 kJ Explanation Heat needed to change 60g (0.06kg) of ice at 0oC to water at 0o = 0.06 x 3.36 x 105J = 0.2016 x 105 J Heat required to raise the temp. of 60g (0.06kg) of water from 0oC to...
A small amount of air is introduced into the vacuum above the mercury in a mercury barometer tube. The mercury level goes down because the air molecules
A. heat the mercury and make it expand B. increase the pressure above the mercury. C. cool the mercury and make it contract. D. decrease the pressure above the mercury Correct Answer: Option B – increase the pressure above the...
A freshly demagnetized bar magnet is placed in the East-West direction to ensure that?
A. the molecular magnets remain randomly arranged. B. the molecular magnets are properly aligned C. it is affected by the earth’s magnetic field D. the magnetic domains are within the earth’s field Correct Answer: Option A – the molecular magnets...
If the efficiency of a transformer is 100%; which of the following equations would be correct?
A. NpEp = NsEs B. NsIp= NpIs C. NsIs = NpIp D. IpEs = IsEp Correct Answer: Option D – IpEs = IsEpProducts
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