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PHY 121 2011

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860 PHY 121 2011 

Part 1 of 2 - 6.6/ 14.6 Points

Question 1 of 31 0.0/ 0.5 Points

Steel is a _________ body

A. Elastic

B. Plastic

C. Both a and b

D. None of these

Answer Key: A

Question 2 of 31 0.5/ 0.5 Points

Restoring force per unit area is called

A. strain

B. elasticity

C. stress

D. plasticity

Answer Key: C

Question 3 of 31 0.5/ 0.5 Points

Betta is the ________ Per _________ 

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 A. longitudinal strain per lateral stress

B. ateral stress per lateral strain

C. longitudinal strain per lateral strain

D. None of these

Answer Key: D

Question 4 of 31 0.0/ 0.5 Points

Viscosity also called

A. External force

B. internal friction

C. upward force

D. external friction

Answer Key: B

Question 5 of 31 0.5/ 0.5 Points

Ostwald’s viscometer is used to compare the co-efficient of viscosity of _____ 

A. two same liquids.

B. one liquid

C. two different liquids

D. more liquids

Answer Key: C

Question 6 of 31 0.0/ 0.5 Points

Mutual attraction between the molecules of different substance is called

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A. cohesive force

B. Adhesive force

C. external force

D. external friction

Answer Key: B

Question 7 of 31 0.0/ 0.5 Points

Rain drops are _______ in shape

A. spherical

B. sphere

C. circle

D. triangle

Answer Key: A

Question 8 of 31 0.5/ 0.5 Points

Surface tension is numerical _______ to surface energy

A. above

B. below

C. equal

D. none of these

Answer Key: C

Question 9 of 31 0.5/ 0.5 Points

Everybody in the universe attracts every other body with a _______ 

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A. force

B. velocity

C. mass

D. density

Answer Key: A

Question 10 of 31 0.5/ 0.5 Points

The universal constant of gravitation (G) in MKS unit

A. 6.670x10-11Newton -cm2/kg

2

B. 6.670x10-11Newton -cm2/g

2 

C. 6.670x10-11Newton -m2/g

2 

D. 6.670x10-11Newton -m2/kg

2 

Answer Key: D

Question 11 of 31 0.0/ 0.5 Points

Heat cannot be transferred one place to other place due to conduction

A. True

B. False

C. no reaction

D. none

Answer Key: B

Question 12 of 31 0.5/ 0.5 Points

 ________ defined as the amount of heat flowing in one second across the opposite faces of a cube of

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side one cum maintained at a difference of temperature of 1oC

A. thermal conductivity

B. thermal diffusivity

C. thermometric

D. thermal evaporation

Answer Key: A

Question 13 of 31 0.5/ 0.5 Points

In rectilinear flow of heat along a bar, the heat used per second to raise the temperature of the rod isequal to

A. Mass x specific heat x temp

B. Mass x specific heat x time

C. Mass x specific heat x temperature gradient

D. Mass x specific heat x time gradient

Answer Key: C

Question 14 of 31 0.5/ 0.5 Points

Forbes method is used to determine the absolute conductivity of _______ 

A. different metals

B. same metals

C. different and same metal

D. None

Answer Key: A

Question 15 of 31 0.0/ 0.5 Points

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In porous plug experiment, the gas is allowed to pass through ________ side to _______side

A. low pressure to high pressure

B. high pressure to low pressure

C. East to west

D. North to south

Answer Key: B

Question 16 of 31 0.0/ 0.5 Points

In a good auditorium it is necessary to keep the _______ negligible small

A. reverberation

B. reflection

C. direct wave

D. reverberation time

Answer Key: D

Question 17 of 31 0.0/ 0.5 Points

When the intensity of sound falls below the maximum audibility level, the listener

A. here

B. not here

C. both a & b

D. none of these

Answer Key: B

Question 18 of 31 0.0/ 0.5 Points

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The sound waves of frequency lower than the audible limit are called

A. ultrasonic

B. microwave

C. infrasonic

D. none

Answer Key: C

Question 19 of 31 0.0/ 0.5 Points

The frequency of the ultrasonic waves produced by magnetrostriction oscillator method is depend onits

A. length, density and volume

B. length, density and plasticity

C. length, density and mass

D. length, density and elasticity

Answer Key: D

Question 20 of 31 0.5/ 0.5 Points

Fathometer is used to find the

A. depth of sea

B. depth of crystal

C. depth of land

D. depth of rock

Answer Key: A

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Question 21 of 31 0.0/ 0.5 Points

 _________ is the enemy of lower life animals

A. Infrasonic

B. audible sound

C. microwave

D. ultrasonic

Answer Key: D

Question 22 of 31 0.5/ 0.5 Points

Bending of beam around the edges of the obstacles called __________ 

A. reflection

B. refraction

C. diffraction

D. deviation

Answer Key: C

Question 23 of 31 0.0/ 0.5 Points

To express the resolving power of an optical instrument as a numerical value Lord Rayleigh proposedan _________ criterion

A. elliptically

B. orbitery

C. cricital

D. none

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Answer Key: B

Question 24 of 31 0.5/ 0.5 Points

The phenomemon of ______ which tells us that light wave is transverse in nature

A. diffraction

B. deflection

C. polarization

D. reflection

Answer Key: C

Question 25 of 31 0.0/ 0.5 Points

 __________ is the light wave communication

A. optical fiber communication

B. telephone communication

C. radio communication

D. SONAR

Answer Key: A

Question 26 of 31 0.0/ 0.5 Points

ptical fiber cable having _________ parts

A. 6

B. 5

C. 4

D. 3

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Answer Key: D

Question 27 of 31 0.5/ 0.5 Points

He-Ne laser is a _____ laser

A. solid

B. gas

C. liquid

D. none

Answer Key: B

Question 28 of 31 0.0/ 0.5 Points

Rubber is a __________ conductor

A. good

B. bad

C. intrinsic semiconductor

D. extrimic semiconductor

Answer Key: B

Question 29 of 31 0.0/ 0.5 Points

Using stokes law we can determine the _____ liquid

A. low viscous b. c. d.

B. high viscous

C. both a and b

D. None

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Answer Key: B

Question 30 of 31 0.1/ 0.1 Points

The good auditorium must need the very ________ reverberation time

A. low

B. same

C. high

D. none

Answer Key: A

Part 2 of 2 - 0.0/ 1.0 Points

Question 31 of 31 0.0/ 1.0 Points

Answer any Five questions 1. Define Hooks law 2. Define Viscosity 3. Gravitation 4. Define Radiation 5.Fresnel’s Assumption 6. Ultrasonic

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