NEET UG Properties of Matter & Heat: Thermal Properties of Matter – Chapter Test

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Difficulty: 7 medium · 13 hard

Thermal Properties of Matter MCQ questions with answers

The first 3 of 20 questions. Unlock the series for the rest, each with a solution.

1. Q1. A steel rod of length 1 m is heated through 100 °C. If the coefficient of linear expansion of steel is 1.2×10⁻⁵ °C⁻¹, the increase in its length is:

   1 m लंबाई की एक इस्पात की छड़ को 100 °C तक गर्म किया जाता है। यदि इस्पात का रेखीय प्रसार गुणांक 1.2×10⁻⁵ °C⁻¹ है, तो इसकी लंबाई में वृद्धि है:

   • A. 0.6 mm
   • B. 1.2 mm
   • C. 0.12 mm
   • D. 12 mm
   Solution

   ΔL = LαΔT = 1 × 1.2×10⁻⁵ × 100 = 1.2×10⁻³ m = 1.2 mm.

   ΔL = LαΔT = 1 × 1.2×10⁻⁵ × 100 = 1.2×10⁻³ m = 1.2 mm।

2. Q2. A calorimeter has a mass of 100 g and is made of a metal of specific heat capacity 0.1 cal g⁻¹ °C⁻¹. Its water equivalent is:

   एक कैलोरीमीटर का द्रव्यमान 100 g है तथा यह 0.1 cal g⁻¹ °C⁻¹ विशिष्ट ऊष्मा धारिता वाले धातु से बना है। इसका जल तुल्यांक है:

   • A. 1 g
   • B. 10 g
   • C. 0.1 g
   • D. 100 g
   Solution

   Water equivalent W = m × s (with the specific heat of water taken as 1 cal g⁻¹ °C⁻¹), so W = 100 × 0.1 = 10 g.

   जल तुल्यांक W = m × s (जल की विशिष्ट ऊष्मा 1 cal g⁻¹ °C⁻¹ लेते हुए), अतः W = 100 × 0.1 = 10 g।

3. Q3. In which one of the following is the physical quantity paired with an INCORRECT SI unit?

   निम्नलिखित में से किस एक में भौतिक राशि को एक गलत SI मात्रक के साथ युग्मित किया गया है?

   • A. Stefan–Boltzmann constant — W m⁻² K⁻⁴ / स्टीफन–बोल्ट्ज़मान स्थिरांक — W m⁻² K⁻⁴
   • B. Specific heat capacity — J kg⁻¹ K⁻¹ / विशिष्ट ऊष्मा धारिता — J kg⁻¹ K⁻¹
   • C. Specific latent heat — J kg⁻¹ K⁻¹ / विशिष्ट गुप्त ऊष्मा — J kg⁻¹ K⁻¹
   • D. Thermal conductivity — W m⁻¹ K⁻¹ / ऊष्मीय चालकता — W m⁻¹ K⁻¹
   Solution

   Specific latent heat is energy per unit mass, with SI unit J kg⁻¹ (no temperature dependence); the pairing with J kg⁻¹ K⁻¹ is wrong. The other three pairings are correct.

   विशिष्ट गुप्त ऊष्मा प्रति एकांक द्रव्यमान ऊर्जा है, जिसका SI मात्रक J kg⁻¹ है (ताप पर कोई निर्भरता नहीं); J kg⁻¹ K⁻¹ के साथ युग्मन गलत है। शेष तीन युग्मन सही हैं।

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