Multiple Choice
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1.
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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 |
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2.
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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 |
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3.
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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 |
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4.
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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 |
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5.
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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 |
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6.
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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 |
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7.
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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. |
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8.
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Sound waves are not transmitted by
A) | gases | C) | a vacuum | B) | liquids | D) | solids |
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9.
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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 |
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10.
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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 |
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11.
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Loudness of a sound is affected by its
A) | amplitude | C) | wavelength | B) | frequency | D) | speed |
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12.
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Dew on the grass is formed by
A) | sublimation | C) | condensation | B) | evaporation | D) | fusion |
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13.
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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. |
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Completion
Complete each
sentence or statement.
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14.
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A wave in which the particle displacement is parallel to the wave motion is
called a ___________ wave.
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15.
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A wave with a frequency of 5 Hz has a period of _________seconds.
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