Name:    Practice Test 2A

Multiple Choice

1.

A mass of 5 kg moves with a velocity of 6 m/s.  What is the kinetic energy of this object?
 A) 75 J B) 30 J C) 90 J D) 150 J

2.

A worker pushes a wheelbarrow with a horizontal force of 50 N a distance of 5 m.  What work does he do?
 A) 250 J B) 10 J C) 55 J D) 1250 J

3.

The region of the electromagnetic spectrum with wavelengths just greater than the ultraviolet region is the ___________region.
 A) microwave C) visible B) X-ray D) infrared

4.

Which of the following methods of heat transfer may take place in a vacuum?
 A) radiation B) convection C) conduction D) none of the above

5.

Bats can emit sound with a frequency of 60 kHz.  If the speed of sound is 330 m/s, what is the wavelength of these waves?
 A) 7.5 mm B) 5.5 mm C) 1.5 mm D) 3.5 mm

6.

If the frequency of a sound wave is doubled, its wavelength is
 A) halved B) not affected C) 4 times the original wavelength D) doubled

7.

A sandy beach gets hot on a sunny day primarily because
 A) sand reflects sunlight so well. B) sand absorbs sunlight so well. C) sand has small specific heat. D) sand has a large specific heat.

8.

Sound waves are not transmitted by
 A) gases C) a vacuum B) liquids D) solids

9.

The law of conservation of energy states that energy cannot be
 A) wasted B) created or destroyed C) transformed D) changed to a more useful form

10.

A weightlifter lifts 250 kg 2 m in 2 sec.  What is his power output?
 A) 5000 watts B) 500 watts C) 250 watts D) 2500 watts

11.

Loudness of a sound is affected by its
 A) amplitude C) wavelength B) frequency D) speed

12.

Dew on the grass is formed by
 A) sublimation C) condensation B) evaporation D) fusion

13.

The direction in which heat is conducted between two bodies depends on
 A) their temperatures. B) whether they are solid, liquid or gas. C) their pressures. D) their thermal energies.

Completion
Complete each sentence or statement.

14.

A wave in which the particle displacement is parallel to the wave motion is called a ___________ wave.

15.

A wave with a frequency of 5 Hz has a period of _________seconds.