Energetics 3 ph Quiz

Which of the following statements about a nuclear fission reaction is/are true?
1. The moderator promotes the capture of neutrons be U-238
2. The control rods prevent the reactor overheating
3. The control rods must be about 4m long

What is the significance of triple point of water?
1. It gives a value of 273.16k
2. It gives the temperature of pure water and melting ice at equilibrium
3. It gives the lowest attainable temperature of a body

  The Zeroth law leads to the conclusion that:
1. Temperature is a well-defined physical quantity
2. Temperature and heat are similar
3. Two bodies can be at thermal equilibrium

  The heat energy requires to convert a unit mass of substance from solid to liquid at constant temperature.
1. Latent heat of fusion
2. Specific latent heat of vaporization
3. Specific laten heat of fusion

  The first law of thermodynamics states
1. Total energy in the universe can be put into a closed system
2. An ideal gas is independent of its energy
3. The total energy in a closed system is constant

  The square root of c2 is known as
1. The root-mean-square speed
2. The mean square velocity
3. The square root of the mean square speed

  What is/are the significance(s) of a constant volume gas thermometer?
1. Can be used to make other thermometers
2. Can be used to graduate other thermometers
3. Can be used to graduate other thermometers

  When two resistors are connected in parallel, the combined resistance is always
1. More than the smallest resistors
2. Less than smallest resistor
3. May be less than or equal to the smallest resistors

  Which of these is/are advantage(s) of a potentiometer
1. It draws no current from the p.d
2. The results only depend on measurement
3. It has no wire/cable to burn out

  From Kirchhoff’s law one, we can conclude that
1. In a closed loop, charge is always conserved
2. Energy is always conserved
3. Some sections of the circuits have the same p.d

  Heat supplied at one end of a well lagged conductor and the other end maintained at 0 degree
Celsius
1. At steady state, the rate of heat flow along the conductor is constant
2. The temperature gradient along the conductor is constant after steady state is reached
3. The thermal resistance of the conductor decreases from hot end to the cold end

  At the boiling point of water
1. The temperature of the water and atmospheric pressure are at equilibrium.
2. The internal energy of the volume of water decrease as it changes from liquid to vapor
3. The water boil because the vapor pressure is equal to the atmospheric pressure

 A net energy will always show flow from body x to body y when they are in thermal contact if
1. X has more quanta than y
2. X has more atoms than y
3. The average number of quanta per atom in x is greater than in y

  For resistors connected in series
1. Current is different through all resistors
2. Current is the same through
3. Total resistance = sum of individual resistance

 Electrical instrument(s) that is /are adapted for measuring both current and voltage
1. Multimeter
2. Multivibrator
3. Multi-purpose electrical meters

  High tension transmission requires
1. The waste power to be small
2. The voltage to be as high as possible
3. The cables to be very tinny

 The thermoelectric effect can be demonstrated using
1. The faraday’s effect
2. The see beck effect
3. The Peltier and Thomson effects

  The equations below shows a relationship between the thermoelectric E.M.F and temperature
E=aӨ + bӨ 2 where the symbol represents their usual meanings a and b are constants.
Where a graph of E/Ө is plotted against Ө, the important of b is:
1. It gives the gradients/ slope
2. It gives the maximum value
3. It gives the y-intercept

Example(s) of energy source(s) that will never run out
1. Sun
2. Tides
3. Petrol

  Why must non-renewable sources of energy need to be conserved
1. Because once used they cannot be replaced
2. Because of the limited nature of it
3. Because they are being converted into other forms of energy.

  The primary fuels derived from living organism can be also called
1. Biomass
2. Bio-fuels
3. Nuclear fuels

  What is/are the function(s) of the reservoir in hydroelectric plant
1. Stores the kinetic energy of water
2. Converts gravitational potential energy to K.E of turbine
3. Regulates the flow of the river which may vary greatly according to season

  The constant volume gas the thermometer cannot be used in all situations. This is because
1. It is bulky
2. It is slow to respond
3. It is too sensitive

  The law of conservation of energy can be state thus.
ΔQ = ΔU + ΔW where the symbols represent their usual meanings ΔQ is positive when
1. Heat is supplied to the gas
2. Heat is taken away from the gas
3. Work is done on the gas