Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NTA Abhyas JEE Main2020PhysicsThermal Properties of MatterPractice

The temperature of a liquid drops from 365 K to 361 K in 2 minutes . The time during which temperature of the liquid drops from 344 K to 342 K is (Room temperature is 293 K ) -

Options

  1. A84 s
  2. B72 s
  3. C66 s
  4. D60 s

Correct answer

A. 84 s

Step-by-step solution

From Newton's law of cooling, 365 - 361 2 = K 365 + 361 2 - 293 ..... (1) 344 - 342 t = K 344 + 342 2 - 293 .... (2) Equation 1 ÷ ( 2 ) t = 365 + 361 - 586 344 + 342 - 586 = 140 100 m i n = 140 × 60 100 s = 84 s

Practice Thermal Properties of Matter on Quantrex Academy →

More from Thermal Properties of Matter

As shown in the figure, an insulated container is fitted with a thermally conducting but immovable partition (P₁) and a freely movable but thermally insulated piston (P₂) . The par 2026The heat extracted out of x gram of water initially at 50°C to cool it down to 0°C is sufficient to evaporate (1000 - x) gram of water also initially at 50°C . The value of x (clos 2026The temperature of a metal strip having coefficient of linear expansion is increased from T₁ to T₂ resulting in increase of its length by L₁ . The temperature is further increased 2026Which of the following best represents the temperature versus heat supplied graph for water, in the range of -20^ C to 120^ C ? 202610 kg of ice at -10^ C is added to 100 kg of water to lower its temperature from 25 ^ C . Consider no heat exchange to surroundings. The decrement to the temperature of water is _ 2026A brass wire of length 2 m and radius 1 mm at 27^ C is held taut between two rigid supports. Initially it was cooled to a temperature of -43^ C creating a tension T in the wire. Th 2026Rods x and y of equal dimensions but of different materials are joined as shown in figure. Temperatures of end points A and F are maintained at 100^ C and 40^ C respectively. Given 2026An aluminium and steel rods having same lengths and cross-sections are joined to make total length of 120 cm at 30^ C . The coefficient of linear expansion of aluminium and steel a 2026 Full Thermal Properties of Matter list All NTA Abhyas JEE Main PYQs