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Saturday, 31 October

JEE Main 2020 · PhysicsNumerical answerNumerical valueMediumCalculation

JEE Main 3 September 2020, Shift 1, Physics Q23

Question 23 of 75 in this shift, Physics question 23 of 25.

A bakelite beaker has volume capacity of 500 cc at 30°C. When it is partially filled with Vm_m volume (at 30°C) of mercury, it is found that the unfilled volume of the beaker remains constant as temperature is varied. If γ(beaker)\gamma_{(\mathrm{beaker})} = 6×\times10−6^{-6} °C−1^{-1} and γ(mercury)\gamma_{(\mathrm{mercury})} = 1.5×\times10−4^{-4} °C−1^{-1}, where γ\gamma is the coefficient of volume expansion, then Vm_m (in cc) is close to __________.

Official answer

20.00

NTA final key (Sep 2020).

Chapter
Thermal Properties of Matter
Topic
Thermal Expansion
Idea tested
Apparent Expansion of Liquids

Same topic in other shifts

All Thermal Expansion questions
  1. 4 Apr 2026, Shift 2 · Q34The temperature of a metal strip having coefficient of linear expansion α\alpha is increased from T1T_1 to T2T_2 resulting in increase of…MediumSingle correct
  2. 5 Apr 2026, Shift 2 · Q34An ideal gas at pressure PP and temperature TT is expanding such that PT3PT^3 = constant. The coefficient of volume expansion of the gas…MediumSingle correct
  3. 4 Apr 2025, Shift 2 · Q31Consider a rectangular sheet of solid material of length l=9l=9 cm and width d=4d=4 cm. The coefficient of linear expansion is…MediumSingle correct
  4. 8 Apr 2023, Shift 2 · Q52A steel rod of length 1 m and cross sectional area 10−410^{-4} m2^2 is heated from 0∘0^\circC to 200∘200^\circC without being allowed to…EasyNumerical value
  5. 25 Jul 2022, Shift 1 · Q54A unit scale is to be prepared whose length does not change with temperature and remains 2020 cm, using a bimetallic strip made of brass…EasyNumerical value
  6. 25 Jun 2022, Shift 2 · Q34A solid metallic cube having total surface area 24 m224\ \mathrm{m}^2 is uniformly heated. If its temperature is increased by…MediumSingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.