Question 1 of 9 Temperature is a measure of A Hotness or coldness B Heat possessed by a body C Potential energy D Thermal energy 💡 Explanation Temperature is defined as the degree of hotness or coldness of a body. It determines the direction of heat flow between two bodies, unlike heat, which is the actual energy transferred. Question 2 of 9 Which of the following thermometer is used to measure very high temperature? A gas thermometer B liquid thermometer C resistance thermometer D pyrometer 💡 Explanation Pyrometers measure temperature based on the thermal radiation emitted by a hot body, without needing direct contact, allowing them to measure very high temperatures where other thermometers would be damaged. Question 3 of 9 Which of following thermometer would you prefer to measure temperature of the Sun? A gas B liquid C pyrometers D platinum resistance thermometer 💡 Explanation Since the Sun's surface temperature is extremely high (thousands of Kelvin) and it cannot be physically contacted, a pyrometer, which works on radiation received, is the suitable choice. Question 4 of 9 At what temperature, reading on Celsius and Fahrenheit scales coincides? A 40° B −40° C 100° D 58° 💡 Explanation Using the conversion [latex]C = \dfrac{5}{9}(F-32)[/latex], setting [latex]C=F[/latex]: [latex]F = \frac{5}{9}(F-32) \implies 9F = 5F-160 \implies 4F=-160 \implex F=-40[/latex] So [latex]-40^\circ C = -40^\circ F[/latex]. Question 5 of 9 At what temperature, reading on Celsius scale will be half the reading on Fahrenheit scale? A 120°C B 160°C C 160°F D 180°C 💡 Explanation Given [latex]C = \dfrac{F}{2}[/latex], and [latex]C=\dfrac{5}{9}(F-32)[/latex]: [latex]\frac{F}{2} = \frac{5}{9}(F-32)[/latex] [latex]9F = 10(F-32) \implies 9F=10F-320 \implies F=320[/latex] So [latex]C = \dfrac{320}{2} = 160^\circ C[/latex] Question 6 of 9 Which of following is usually used in liquid thermometer? A water B mercury C alcohol D benzene 💡 Explanation Mercury is commonly used in liquid thermometers because it has a uniform rate of expansion, does not wet glass, has high thermal conductivity, and remains liquid over a wide temperature range. Question 7 of 9 Temperature of liquid is 27°C, its temperature in Kelvin scale is A 246 K B 273 K C 300 K D 253 K 💡 Explanation [latex]T(K) = T(^\circ C) + 273 = 27+273 = 300\text{ K}[/latex] Question 8 of 9 The absolute temperature corresponding to 200°C is A - 73 K B 73 K C 473 K D 427 K 💡 Explanation [latex]T(K) = T(^\circ C)+273 = 200+273 = 473\text{ K}[/latex] Question 9 of 9 The upper fixed point and lower fixed point of a faulty thermometer are 110°C and −5°C respectively. If this thermometer is used to measure the temperature of a liquid whose actual temperature is 50°C, reading on the thermometer will be A 62.5°C B 57.5°C C 52.5°C D 42.5°C 💡 Explanation For a faulty thermometer, the reading [latex]\theta_f[/latex] is related to the actual (correct) temperature [latex]\theta[/latex] by: [latex]\frac{\theta_f - \text{LFP}}{\text{UFP}-\text{LFP}} = \frac{\theta - 0}{100-0}[/latex] Here, LFP = −5°C, UFP = 110°C, so range = 115: [latex]\frac{\theta_f-(-5)}{115} = \frac{50}{100}[/latex] [latex]\theta_f + 5 = 57.5 \implies \theta_f = 52.5^\circ C[/latex] ← Prev Check Next → Finish & See Score 0 of 9 checked ← Back 1 / 9 1 2 3 4 5 6 7 8 9
