NIOS Class 10 Science and Technology Chapter 14: THERMAL ENERGY– Chapter-wise Important Questions and Answers

NIOS Class 10 Science and Technology Chapter 14: THERMAL ENERGY | MCQs, Short & Long Answer Questions | 14. THERMAL ENERGY

Chapter 14: THERMAL ENERGY

INTEXT QUESTIONS 14.1

State whether the following statements are true or false:

(i) Heat can be measured in kelvin.

(ii) –30° F is a lower temperature than –30° C.

(iii) The numerical value of temperature of any hot body measured on kelvin’s scale is always higher than the value on Fahrenheit scale.

(iv) Thermal energy can be measured either in calories or in joules.

(v) Pure alcohol can also be used as thermometric liquid.

(vi) A body is felt cold when heat flows from our body to that body.

Answer:  (i) Heat can be measured in kelvin. → False
[ Kelvin is a unit of temperature, not heat. Heat is measured in joules (J) or calories (cal). ]

(ii) –30° F is a lower temperature than –30° C. → False
[ Converting –30°C to Fahrenheit:

  

So, –30°F is actually colder than –30°C. ]

(iii) The numerical value of temperature of any hot body measured on kelvin’s scale is always higher than the value on Fahrenheit scale. → True

[For any temperature above absolute zero, the Kelvin value is always numerically higher than the Fahrenheit value because Kelvin starts at -273.15°C, while Fahrenheit starts at -459.67°F (e.g., 0 K = -459.67°F).]

(iv) Thermal energy can be measured either in calories or in joules. → True
[ Thermal energy (heat) is measured in calories or joules.]

(v) Pure alcohol can also be used as thermometric liquid. → True
[ Alcohol is used in thermometers because it expands uniformly and works at low temperatures.]

(vi) A body is felt cold when heat flows from our body to that body. → True
[ We feel cold when heat leaves our body and flows to another object.]

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