tahsili Physics test 1

Mechanics: What is the formula for calculating force?

• force = velocity x time

• force = distance / time

• force = energy / mass

• force = mass x acceleration

Mechanics: What is the difference between mass and weight?

• Mass is measured in pounds, while weight is measured in kilograms

• Mass and weight are the same thing

• Mass is the force exerted on an object due to gravity, while weight is the amount of matter in an object

• Mass is the amount of matter in an object, while weight is the force exerted on an object due to gravity.

Mechanics: Explain the concept of momentum.

• Momentum is the product of an object's mass and its velocity.

• Momentum is the force exerted by an object in motion.

• Momentum is the same as inertia.

• Momentum is the energy stored in an object.

Electricity and Magnetism: What is Ohm's law?

• Ohm's law states that resistance is directly proportional to current

• The current through a conductor is inversely proportional to the voltage across the two points

• Ohm's law is the relationship between voltage and power in a circuit

• The current through a conductor is directly proportional to the voltage across the two points

Electricity and Magnetism: Define electric field and magnetic field.

• The electric field is a field of force surrounding a charged particle, and the magnetic field is a field of force produced by moving charges or currents.

• The electric field is a field of force produced by moving charges, and the magnetic field is a field of force surrounding a charged particle.

• The electric field is a field of force surrounding a magnet, and the magnetic field is a field of force produced by charged particles.

• The electric field is a field of force produced by magnets, and the magnetic field is a field of force surrounding a power source.

Electricity and Magnetism: Explain the working principle of an electric generator.

• An electric generator works by creating a chemical reaction to generate electricity.

• An electric generator works on the principle of electromagnetic induction.

• An electric generator works by using solar energy to produce electricity.

• An electric generator works by converting heat energy into electrical energy.

Thermodynamics: What is the first law of thermodynamics?

• Energy can be destroyed completely

• Energy can be created out of nothing

• Energy can only be transformed into matter

• Energy cannot be created or destroyed, only transformed from one form to another.

Thermodynamics: Define entropy and its significance in thermodynamics.

• Entropy is a measure of the disorder or randomness of a system and its significance lies in representing the amount of energy in a system that is no longer available for doing mechanical work.

• Entropy is a measure of the temperature of a system and its significance lies in representing the amount of energy in a system available for doing mechanical work.

• Entropy is a measure of the order or organization of a system and its significance lies in representing the amount of energy in a system that is available for doing mechanical work.

• Entropy is a measure of the pressure of a system and its significance lies in representing the amount of energy in a system that is available for doing mechanical work.

Thermodynamics: Explain the concept of heat engines.

• Heat engines are devices that convert mechanical energy into thermal work.

• Heat engines are devices that convert electrical energy into mechanical work.

• Heat engines are devices that convert light energy into mechanical work.

• Heat engines are devices that convert thermal energy into mechanical work.

Optics: Define reflection and refraction of light.

• Absorption and transmission

• Diffraction and interference

• Scattering and dispersion

• Reflection and refraction