Multiple choice questions on the topic of energy, including its definition, units, types, and components.

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Energy of a system is defined as: Energy is the capacity of a system to do work.
- A. The capacity to do work
- B. The force exerted to build up pressure in a system
- C. The force released in an open system
- D. The force observed at a constant value of Internal energy of a system.
The correct answer is A.
The unit of work and energy is the same because: Work is a form of energy transfer, and energy is the capacity to do work. They are fundamentally related and represent the same physical quantity in terms of measurement.
- A. Energy is a function of work
- B. Energy is independent of work
- C. Work and energy share inverse proportionality.
- D. Energy is different from work
The correct answer is A.
The following are the different types of energy a body can possess except: Nuclear, mechanical, and electrical energy are recognized forms of energy that a body can possess. "Cosmic energy" is not a standard, specific type of energy possessed by a body in the same way.
- A. Nuclear Energy
- B. Mechanical energy
- C. Electrical energy
- D. Cosmic energy
The correct answer is D.
Energy of a system comprises.......................... The total mechanical energy of a system is the sum of its kinetic energy (due to motion) and potential energy (due to position or state).
- A. Kinetic and Thermal energy
- B. Potential and Kinetic energy
- C. Potential and renewable energy
- D. Kinetic and solar energy
The correct answer is B.
Change in Internal energy is designated negative for An exothermic reaction releases heat to the surroundings, meaning the system loses energy, and its internal energy decreases ( $\Delta U < 0$ ).
- A. An exothermic reaction
- B. An Endothermic reaction
- C. A reversible reaction
- D. An irreversible reaction
The correct answer is A.
The negative sign in the following expression: W = -PΔV, indicates that In the convention $W = -P\Delta V$ , if the system expands ( $\Delta V > 0$ ), then $W$ is negative. A negative $W$ means the system does work on the surroundings, thereby losing energy, and the surroundings gain that energy.
- A. The surrounding gains energy from the system
- B. The surrounding releases energy to the system
- C. The system takes up heat energy from the surrounding
- D. The heat content of the system is in equilibrium with that of the surrounding.
The correct answer is A.
.................... Is used to determine the enthalpy of combustion of volatile liquids such as alcohols and liquid hydrocarbons A flame calorimeter is specifically designed for measuring the enthalpy of combustion of volatile liquids or gases by burning them in a controlled flame. A bomb calorimeter is typically used for non-volatile substances at constant volume.
- A. Flame calorimeter
- B. Bomb calorimeter
- C. Flame photometer
- D. Glass tubing
The correct answer is A.
The following mathematical expression; $\Delta U = q + w$ denotes: This equation states that the change in internal energy ( $\Delta U$ ) of a system is equal to the heat ( $q$ ) added to the system plus the work ( $w$ ) done on the system. This is the mathematical statement of the First Law of Thermodynamics, which is a statement of energy conservation.
- A. First law of thermodynamics
- B. Second law of thermodynamics
- C. Law of definite proportion
- D. Third law of thermodynamics
The correct answer is A.

Multiple choice questions on the topic of energy, including its definition, units, types, and components.

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