# XI_PHYSICS_HEAT AND THERMODYNAMICS_9 Online Test

Heat energy is either absorbed or rejected
Heat energy remains the same
Kinetic energy is absorbed and potential energy is rejected
None of the above
In pressure cookers, the liquid boils at a _____ because the pressure inside is more than the atmospheric pressure.
Lower temperature
Higher temperature
Same temperature
None of the above
What is the change in the melting point of naphthalene for one atmosphere rise in pressure given that its melting point is 80oC (Latent heat of fusion is 4563 cal/mol and increase in volume on fusion is 18.7 cm3 per mole)?
0.03488oC
0.035660C
0.3672oC
0.3489oC
What is the boiling point of benzene under a pressure of 80 cm of mercury, the normal boiling point being 80oC cm of mercury, the normal boiling point 80oC (Latent heat of vaporization is 380 joules/gram, density of vapour at boiling point is 4 g/litre and that of the liquid 0.9 g/cm3)?
80.288oC
81.233oC
82.297oC
83.254oC
When lead is melted at atmospheric pressure, the density decreases from 11.01 to 10.65 g/cm3 (melting point= 600 K) and the latent heat of fusion is 24.5 J/g. what is the melting point at a pressure of 100 atmospheres?
600.7539 K
601.2385 K
602.5383 K
603.7463 K
With the increase in temperature of the metal surface, if the kinetic energy of electrons exceeds the work function, electrons can escape from the surface of the metal. This phenomenon is called
Photoelectric emission
Thermionic emission
Both (a) and (b)
Which of the following particles are thermions?
Protons
Electrons
Neutrons
Mesons
The entropy ________ during an adiabatic reversible process.
Increases
Decreases
Remains constant
First increases then decreases
What is the change in entropy when 10 grams of ice at 0oC is concerted into water at the same temperature?
2.54 cal/K
2.63 cal/K
2.87 cal/K
2.93 cal/K
What is the change in entropy when 5 kg of water at 100oC is converted into steam at the same temperature?
6835 cal/K
7240 cal/K
7538 cal/K
7223 cal/K
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