Class XI Physics Thermal Properties of Matter 1 for NEET & AIIMS Exams

Question 1

Cooling water enters the heat exchanger in the turbine hall of a nuclear power station at 6 °C and leaves at 14 °C. The specific heat capacity of water is 4200 J kg^–1 K^–1. If the rate of heat removal by the water is 6.72 × 10⁹ J per minute, what is the rate of water flow ?

Question 2

If there are no heat losses, the heat released by the condensation of x g of steam at 100 °C into water at 100 °C can be used to convert y g of ice at 0 °C into water at 100 °C. Then the ratio y : x is nearly–

Question 3

A liquid in a beaker has temperature θ (t) at time t and θ₀ is temperature of surroundings, then according to Newton’s law of cooling the correct graph between log_e (θ - θ₀) and t is

Question 4

According to Newton’s law of cooling, the rate of cooling of a body is proportional to (Δθ)ⁿ, where Δ θ is the difference of the temperature of the body and the surroundings, and n is equal to

Question 5

The accompanying graph shows the variation of temperature (T) of one kilogram material with Heat (Q) supplied to it. At O, the substance is in solid state. Which of the following interpretation from the graph is correct –

Question 6

Heat is flowing through the cylindrical rods of the same material. The diameters of the rods are in the ratio 1 : 2 and their lengths are in the ratio 2 : 1. If the temperature difference between their ends is the same then the ratio of the amount of heat conducted through them per unit time will be-

Question 7

A steel rod of length 25 cm has a cross–sectional area of 0.8 cm². The force required to stretch this rod by the same amount as the expansion produced by heating it through 10 °C is coefficient of linear expansion of steel is 10^–5 °C^–1. Young's modulus of steel is 2 × 10¹⁰ N/m².

Question 8

An anisotropic material has coefficient of linear thermal expansion α₁, α₂ and α₃ along x, y and z–axis respectively. Coefficient of cubical expansion of its material will be equal to-