Physics Quiz Questions And Answers

1. An object is weightless when it is:

In motion

Being accelerated

In freefall

Stationary

Weightlessness is the experience of having no apparent weight. This occurs when an object is in freefall, meaning it is falling under the sole influence of gravity. In this state, the object and its occupants are accelerating towards the Earth at the same rate, creating a sensation of weightlessness. This is why astronauts in orbit around the Earth experience weightlessness, as they are constantly in freefall towards the Earth, but their horizontal velocity keeps them from crashing into it.

Explanation

Weightlessness is the experience of having no apparent weight. This occurs when an object is in freefall, meaning it is falling under the sole influence of gravity. In this state, the object and its occupants are accelerating towards the Earth at the same rate, creating a sensation of weightlessness. This is why astronauts in orbit around the Earth experience weightlessness, as they are constantly in freefall towards the Earth, but their horizontal velocity keeps them from crashing into it.

2. How far from your hand has a falling object gone when 2 seconds had already elapsed after releasing it?

9.8 meters

19.6 meters

39.2 meters

7 meters

Explanation

3. Which one among the following units cannot be used to express work?

Calorie

Joule

Newton

Watt-second

Newton(N) is a unit of force.

Explanation

Newton(N) is a unit of force.

4. In a certain equation, X=Fv where F is the force applied and v is the velocity. What is X?

Work

Power

Distance

Momentum

Power is equal to the Force multiplied by the velocity.

Explanation

Power is equal to the Force multiplied by the velocity.

5. What is the potential difference in a circuit that has a magnetic flux density of 3 Teslas, conductor length of 2 meters, and current flow velocity of 5 meters per second?

1.2 volts

7.5 volts

3.33 volts

30 volts

Voltage or the Potential Difference is also equal to the product of the magnetic flux density, length, and velocity or simply V=Blv

Explanation

Voltage or the Potential Difference is also equal to the product of the magnetic flux density, length, and velocity or simply V=Blv

6. Which of the following is an appropriate derived unit for Tesla?

Volts per square meter

Amperes per second

Farads per Volt-second

Weber per square meter

Tesla is a unit for magnetic flux density. The unit for magnetic flux is the weber, therefore, dividing the magnetic flux by the area gives you the magnetic flux density.

Explanation

Tesla is a unit for magnetic flux density. The unit for magnetic flux is the weber, therefore, dividing the magnetic flux by the area gives you the magnetic flux density.

7. What is the ratio between the velocities in which a body travels before and after impact? (It is still important however to remember that this still relates to momentum since the final velocities are dependent on mass.)

Coefficient of static friction

Coefficient of fugacity

Impedance

Coefficient of restitution

The coefficient of restitution is a measure of the elasticity of a collision between two objects. It represents the ratio of the final relative velocity of the objects after impact to their initial relative velocity before impact. In other words, it quantifies how much kinetic energy is conserved during the collision. A coefficient of restitution of 1 indicates a perfectly elastic collision where the objects bounce off each other with no loss of kinetic energy.

Explanation

The coefficient of restitution is a measure of the elasticity of a collision between two objects. It represents the ratio of the final relative velocity of the objects after impact to their initial relative velocity before impact. In other words, it quantifies how much kinetic energy is conserved during the collision. A coefficient of restitution of 1 indicates a perfectly elastic collision where the objects bounce off each other with no loss of kinetic energy.

8. Which of the following equations would correctly represent the heat transfer in the given situation? (Note that Q stands for heat.)

A hot iron ring is dipped into a wooden bucket filled with water. After a while, the system achieved thermal equilibrium.

Q of Wood + Q of Water = -Q of Iron

Q of Iron + Q of Water = -Q of Wood

Q of Wood + Q of Water = Q of Iron

-(Q of Wood + Q of Water)= -Q of Iron

Heat lost by the iron ring is equal to the heat gained by the bucket and the water.

Explanation

Heat lost by the iron ring is equal to the heat gained by the bucket and the water.

9. Who were the scientists who proposed that the same amount of heat is needed by all atoms for its temperature to be raised by one kelvin even if these atoms have totally different masses?

Petit and Dulong

Watson and Crick

Pauling and Corey

Boltzmann and Stefan

The rule of Petit and Dulong states that the same amount of heat is needed by all atoms despite the difference in the atomic masses for its temperature to be raised by one Kelvin.

Explanation

The rule of Petit and Dulong states that the same amount of heat is needed by all atoms despite the difference in the atomic masses for its temperature to be raised by one Kelvin.

10. ________ means "measuring heat".

Calorimetry is the scientific process of measuring heat. It involves using a calorimeter, a device that measures the amount of heat absorbed or released during a chemical reaction or physical process. By measuring the temperature change of a substance, calorimetry allows for the determination of the heat transfer involved.

Explanation

Calorimetry is the scientific process of measuring heat. It involves using a calorimeter, a device that measures the amount of heat absorbed or released during a chemical reaction or physical process. By measuring the temperature change of a substance, calorimetry allows for the determination of the heat transfer involved.

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