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Grade 12 :: Thermodynamics by teachchemistry
Which of the following equations is used to represent the First Law of Thermodynamics for a closed system, according to the IUPAC convention?
1. $DeltaU=Q+W$
2. $DeltaU=W-Q$
3. $DeltaU=Q-W$
4. $DeltaU=Q+2W$
Grade 12 :: Light and Optics by tanyamajmudar
What occurs when the angle of incidence of a light ray is greater than the critical angle?
1. critical refraction
2. total internal reflection
3. total external reflection
4. dispersion
Grade 12 :: Thermodynamics by teachchemistry
If $DeltaS$ denotes entropy change, then what is the entropy change for a reversible adiabatic process?
1. $DeltaS = 0$
2. $DeltaS = 1$
3. $Delta S < 1$
4. $DeltaS >1$
According to second law of thermodynamics, heat energy cannot be completely converted into useful work owing to
1. the entropy of the system
2. the enthalpy of the system
3. the internal energy of the system
4. the translational energy of the system
Grade 12 :: Light and Optics by tanyamajmudar
Grade 12 :: Forces and Motion by tanyamajmudar
If a body goes from 10m/s to 50m/s in 8 seconds, what is its acceleration?
1. $1.25m/s^2$
2. $5m/s^2$
3. $6.25m/s^2$
4. $40m/s^2$
Grade 12 :: Forces and Motion by tanyamajmudar
Grade 12 :: Heat Transfer by tanyamajmudar
The change in the internal energy of a closed system is equal to the amount of heat supplied to the system, minus
1. the amount of heat that is not conserved.
2. the amount of work done by the system on its surroundings.
3. the original internal energy.
4. the volume difference.
Grade 12 :: Forces and Motion by tanyamajmudar
If the acceleration of an object is negative, its velocity
1. will be increasing.
2. will be decreasing.
3. will be zero.
4. will be constant.
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