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Davedaveskey
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• 1.

An object is weightless when it is:

• A.

In motion

• B.

Being accelerated

• C.

In freefall

• D.

Stationary

C. In freefall
Explanation
For a body to be weightless, it must be in freefall.

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• 2.

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

• A.

Calorie

• B.

Joule

• C.

Newton

• D.

Watt-second

C. Newton
Explanation
Newton(N) is a unit of force.

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• 3.

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

• A.

9.8 meters

• B.

19.6 meters

• C.

39.2 meters

• D.

7 meters

B. 19.6 meters
Explanation
For objects in freefall, we use the equation d=(1/2)g(t^2) where d is the distance traveled, g is the acceleration due to gravity, and t is the time elapsed upon the release of the body.

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• 4.

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

• A.

Work

• B.

Power

• C.

Distance

• D.

Momentum

B. Power
Explanation
Power is equal to the Force multiplied by the velocity.

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• 5.

________  means "measuring heat".

calorimetry
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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• 6.

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?

• A.

1.2 volts

• B.

7.5 volts

• C.

3.33 volts

• D.

30 volts

D. 30 volts
Explanation
Voltage or the Potential Difference is also equal to the product of the magnetic flux density, length, and velocity or simply V=Blv

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• 7.

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?

• A.

Petit and Dulong

• B.

Watson and Crick

• C.

Pauling and Corey

• D.

Boltzmann and Stefan

A. Petit and Dulong
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.

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• 8.

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.)

• A.

Coefficient of static friction

• B.

Coefficient of fugacity

• C.

Impedance

• D.

Coefficient of restitution

D. Coefficient of restitution
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.

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• 9.

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

• A.

Volts per square meter

• B.

Amperes per second

• C.

• D.

Weber per square meter

D. Weber per square meter
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.

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• 10.

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.

• A.

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

• B.

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

• C.

Q of Wood + Q of Water = Q of Iron

• D.

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

A. Q of Wood + Q of Water = -Q of Iron
Explanation
Heat lost by the iron ring is equal to the heat gained by the bucket and the water.

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• Current Version
• Mar 21, 2023
Quiz Edited by
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• Dec 30, 2008
Quiz Created by
Davedaveskey

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