Question 1

A block of wood with a density of $$600\ \mathrm{kg/m^3$} is $$placed in water (density $$1000\ \mathrm{kg/m^3$}). $$What fraction of the block's volume will be submerged when it floats?

Accepted Answer

$$0.60$$

Question 2

Which of the following best explains why atmospheric pressure decreases with altitude?

Accepted Answer

There is less air above a given point as altitude increases, so the weight of the air column decreases.

Question 3

A hydraulic lift uses Pascal's Principle to lift a car. If a force of $$500\ \mathrm{N} is $$applied to a piston with an area of $$0.01\ \mathrm{m^2$}$$, what is the pressure transmitted to the fluid?

Accepted Answer

$$50,000\ \mathrm{Pa}$$

Question 4

According to Archimedes' Principle, what is the buoyant force on a $$2\ \mathrm{kg}$$ object fully submerged in water (density $$1000\ \mathrm{kg/m^3$}) $$with a volume of $$0.0025\ \mathrm{m^3$}$$? (Take $$g = 10\ \mathrm{m/s^2$})$$

Accepted Answer

$$25\ \mathrm{N}$$

Question 5

A gas at $$300\ \mathrm{K}$$ has a volume of $$2.0\ \mathrm{L}$$ and a pressure of $$1.0\ \mathrm{atm}. If $$the temperature is increased to $$600\ \mathrm{K}$$ and the pressure is kept constant, what is the new volume?

Accepted Answer

$$4.0\ \mathrm{L}$$

Question 6

Which of the following statements about conductors and insulators is correct?

Accepted Answer

Conductors allow electric charge to flow freely, while insulators do not.

Question 7

If two point charges, $$q_1$$ and $$q_2$$, are separated by a distance $$r$$, what happens to the electrostatic force between them if the distance is doubled?

Accepted Answer

The force decreases by a factor of 4.

Question 8

A $$12\ \mathrm{V}$$ battery is connected to a resistor of $$4\ \Omega. $$What is the current through the resistor?

Accepted Answer

$$3\ \mathrm{A}$$

Question 9

Which of the following best describes the difference between direct current (DC) and alternating current (AC)?

Accepted Answer

DC flows in one direction, while AC reverses direction periodically.

Question 10

A parallel circuit has three resistors: $$2\ \Omega$$, $$4\ \Omega$$, and $$6\ \Omega. $$What is the total resistance?

Accepted Answer

$$1\ \Omega$$

Question 11

Which of the following is a correct statement of Bernoulli's Principle as applied to fluid flow in a pipe?

Accepted Answer

Where the speed of a fluid increases, the internal pressure decreases.

Question 12

A $$60\ \mathrm{W}$$ light bulb is connected to a $$120\ \mathrm{V}$$ outlet. What is the current through the bulb?

Accepted Answer

$$0.5\ \mathrm{A}$$

Question 13

Which of the following best describes charge polarization?

Accepted Answer

The separation of positive and negative charges within a neutral object.

Question 14

If the pressure at the bottom of a swimming pool is $$120,000\ \mathrm{Pa}$$ and the atmospheric pressure is $$100,000\ \mathrm{Pa}$$, what is the gauge pressure at the bottom?

Accepted Answer

$$20,000\ \mathrm{Pa}$$

Question 15

Which of the following is the correct formula for electric field strength $$E$$ due to a point charge $$q at a $$distance $$r$$?

Accepted Answer

$$E = \dfrac{kq}{r^2$}$$

Question 16

A $$10\ \mathrm{kg}$$ object is suspended in air and appears to weigh $$8\ \mathrm{kg}$$ when fully submerged in a liquid. What is the buoyant force acting on the object? (Take $$g = 10\ \mathrm{m/s^2$})$$

Accepted Answer

$$20\ \mathrm{N}$$

Question 17

Which of the following is true about the conservation of electric charge?

Accepted Answer

The total amount of electric charge in an isolated system remains constant.

Question 18

A $$9\ \mathrm{V}$$ battery is connected to a circuit with a total resistance of $$18\ \Omega. $$What is the power dissipated in the circuit?

Accepted Answer

$$0.5\ \mathrm{W}$$

Question 19

Which of the following best describes the relationship between pressure, force, and area?

Accepted Answer

$$P = \dfrac{F}{A}$$

Physics Study Guide: Liquids, Gases, Electrostatics, and Electric Current

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