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Physics: Physical Quantities and Units

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Questions and Answers

What is the effect of increasing the length of a conductor on its resistance?

Resistance increases but only at high temperatures

Resistance increases as length increases (correct)

Resistance remains unchanged regardless of length

Resistance decreases as length increases

Which of the following best describes the relationship between mass and density?

Density is the mass times volume

Density is the mass per unit volume (correct)

Density is the mass plus volume

Density is the volume divided by mass

How does temperature affect the resistance of a conductor?

Higher temperature results in lower resistance

Resistance decreases only at freezing temperatures

Higher temperature results in higher resistance (correct)

Temperature has no impact on resistance

Which formula correctly represents the relationship between voltage, current, and resistance?

V = I * R Signup and view all the answers

What happens to the floating behavior of substances in water based on their density?

Substances denser than water will sink Signup and view all the answers

Which of the following is a factor that increases resistance?

Increasing the temperature of the conductor Signup and view all the answers

In the formula for energy, which unit is used to measure energy?

Joules Signup and view all the answers

What defines resistance in a material?

Its ability to prohibit electrical flow Signup and view all the answers

Study Notes

Physical Quantities and Units

Density (D): Mass of a substance per unit volume. Unit: g/cm³. Formula: m/V
Volume (V): Amount of space occupied by a substance. Unit: cm³. Formula: m/D
Mass (m): Amount of matter in a substance. Unit: Grams (g). Formula: D x V
Voltage (V): Electrical potential difference. Unit: Volts (V). Formula: I x R
Resistance (R): Opposition to the flow of electric current. Unit: Ohms (Ω). Formula: V/I
Current (I): Flow of electric charge. Unit: Amperes (A). Formula: V/R
Energy (E): Capacity to do work. Unit: Joules (J).
Charge (Q): Electric property of matter. Unit: Coulomb (C)
Time (T): Duration of an event. Unit: Seconds (s)

Factors Affecting Resistance

Length: Shorter length = lower resistance; longer length = higher resistance.
Thickness: Thicker material = lower resistance; thinner material = higher resistance.
Temperature: Higher temperature = higher resistance; lower temperature = lower resistance.

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Description

Explore essential physical quantities and units in this quiz, covering concepts like density, volume, mass, voltage, and resistance. Understand the formulas that govern these quantities and the factors affecting resistance. Test your knowledge on the fundamental principles of physics.