JEE Main 2021 (Online) 27th August Evening Shift | Heat and Thermodynamics Question 217 | Physics

The height of victoria falls is 63 m. What is the difference in temperature of water at the top and at the bottom of fall?

[Given 1 cal = 4.2 J and specific heat of water = 1 cal g^$$-$$1 $$^\circ$$0C^$$-$$1]

0.147$$^\circ$$ C

14.76$$^\circ$$ C

1.476$$^\circ$$ C

0.014$$^\circ$$ C

JEE Main 2021 (Online) 27th August Morning Shift

MCQ (Single Correct Answer)

-1

A balloon carries a total load of 185 kg at normal pressure and temperature of 27$$^\circ$$C. What load will the balloon carry on rising to a height at which the barometric pressure is 45 cm of Hg and the temperature is $$-$$7$$^\circ$$C. Assuming the volume constant?

181.46 kg

214.15 kg

219.07 kg

123.54 kg

JEE Main 2021 (Online) 27th August Morning Shift

MCQ (Single Correct Answer)

-1

An ideal gas is expanding such that PT³ = constant. The coefficient of volume expansion of the gas is :

$${1 \over T}$$

$${2 \over T}$$

$${4 \over T}$$

$${3 \over T}$$

JEE Main 2021 (Online) 26th August Evening Shift

MCQ (Single Correct Answer)

-1

The temperature of equal masses of three different liquids x, y and z are 10$$^\circ$$C, 20$$^\circ$$C and 30$$^\circ$$C respectively. The temperature of mixture when x is mixed with y is 16$$^\circ$$C and that when y is mixed with z is 26$$^\circ$$C. The temperature of mixture when x and z are mixed will be :

28.32$$^\circ$$C

25.62$$^\circ$$C

23.84$$^\circ$$C

20.28$$^\circ$$C

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