Question 1

A sound wave travels through air at a speed of $$340\ \mathrm{m/s}. If $$the frequency of the wave is $$1700\ \mathrm{Hz}$$, what is the wavelength of the sound wave?

Accepted Answer

$$0.2\ \mathrm{m}$$

Question 2

Which of the following statements best describes the second law of thermodynamics?

Accepted Answer

The entropy of an isolated system always increases or remains constant.

Question 3

A refrigerator removes $$500\ \mathrm{J} of $$heat from its interior and expels $$600\ \mathrm{J} of $$heat to the surroundings. What is the work input required for this process?

Accepted Answer

$$100\ \mathrm{J}$$

Question 4

A metal rod is $$2\ \mathrm{m}$$ long at $$20^\circ\mathrm{C}. If $$the coefficient of linear expansion is $$1.2 	imes 10$$^{-5}$$\ \mathrm{K}^{-1}$$, what will be its length at $$70^\circ\mathrm{C}$$?

Accepted Answer

$$2.0012\ \mathrm{m}$$

Question 5

Which of the following best explains why sound travels faster in solids than in gases?

Accepted Answer

Particles in solids are closer together, allowing vibrations to transfer more efficiently.

Question 6

A $$10\ \mathrm{kg}$$ block is placed on a frictionless incline at an angle of $$30^\circ. $$What is the component of the gravitational force acting parallel to the incline?

Accepted Answer

$$49\ \mathrm{N}$$

Question 7

A $$2\ \mathrm{kg}$$ object is attached to a spring with a force constant $$k = 200\ \mathrm{N/m}. $$What is the period of oscillation?

Accepted Answer

$$0.628\ \mathrm{s}$$

Question 8

Which of the following is NOT a correct statement about standing waves?

Accepted Answer

Nodes are points of maximum displacement.

Question 9

A Carnot engine operates between $$T_H = 500\ \mathrm{K}$$ and $$T_C = 300\ \mathrm{K}. $$What is its maximum possible efficiency?

Accepted Answer

$$0.4$$

Question 10

A $$5\ \mathrm{C}$$ charge moves through a potential difference of $$12\ \mathrm{V}. $$How much work is done by the electric field?

Accepted Answer

$$60\ \mathrm{J}$$

Question 11

Which of the following best describes the physical meaning of electric field lines?

Accepted Answer

They indicate the direction of the force on a positive test charge.

Question 12

A parallel-plate capacitor is charged and then disconnected from the battery. If the plates are pulled apart, what happens to the voltage across the plates?

Accepted Answer

It increases.

Question 13

Which of the following is a correct application of Gauss's Law?

Accepted Answer

Calculating the electric field outside a uniformly charged sphere.

Question 14

A $$10\ \mathrm{\mu F}$$ capacitor is connected to a $$100\ \mathrm{V}$$ battery. How much energy is stored in the capacitor?

Accepted Answer

$$0.05\ \mathrm{J}$$

Question 15

A $$2\ \mathrm{m}$$ long copper wire has a resistance of $$0.1\ \Omega. If $$the wire is stretched to $$4\ \mathrm{m}$$ without changing its volume, what is the new resistance?

Accepted Answer

$$0.4\ \Omega$$

Question 16

Which of the following is a correct statement about the direction of induced current according to Lenz's Law?

Accepted Answer

It opposes the change in magnetic flux that produced it.

Question 17

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 18

A $$1\ \mathrm{kg}$$ block is attached to a spring and oscillates with amplitude $$0.1\ \mathrm{m}$$ and period $$2\ \mathrm{s}. $$What is the maximum speed of the block?

Accepted Answer

$$0.314\ \mathrm{m/s}$$

Question 19

Which of the following is a correct statement about the Doppler effect?

Accepted Answer

It describes the change in frequency of a wave due to the relative motion of source and observer.

Question 20

A $$3\ \mathrm{\Omega}$$ and a $$6\ \mathrm{\Omega}$$ resistor are connected in parallel across a $$12\ \mathrm{V}$$ battery. What is the total current supplied by the battery?

Accepted Answer

$$6\ \mathrm{A}$$

General Physics II (PHYS102) - Syllabus and Study Guide

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