PHY101: Elementary Mechanics, Heat &properties Of Matter TMA3
Question 1 : Which of the following substances has the highest viscosity at room temperature?
A.kerosine
B.Water
C.palm oil
D.alcohol
Answer to question 1 is C. palm oil
Question 2 : A ______________ of reference is a set of coordinate axes used to describe the motion of an object.
A.geometry
B.(x, y)
C.x and y axes
D.frame
Answer to question 2 is A. geometry
Question 3 : One of these is an example of thermal radiation detector
A.bolometer
B.thermal glass
C.thermometer
D.thermal rod
Answer to question 2 is B. thermal glass
Question 4 : The mechanism of heat transfer from one point to another through vibration of the molecules of the medium is called ————-
A.radiation
B.diffusion
C.conduction
D.convection
Answer to question 4 is D. convection
Question 5 : ____________ point is reached when the molecules of a loaded piece of wire begin to slide past each other as it exceeds its elastic limit
A.Yield
B.Collision
C.Elastic
D.Fixed
Answer to question 5 is B. collision
Question 6 : Thermal expansion of a solid material depends on the following EXCEPT
A.the nature of the material making up the solid
B.the initial dimensions of the solid
C.the range of the temperature change
D.average translational motion of constituent atoms of the material
Answer to question 6 is D.average translational motion of constituent atoms of the material
Question 7 : Work and moment of a force have the same _________________
A.geometry
B.dimension
C.unit
D.dimensionless
Answer to question 7 is C. unit
Question 8 : Quantities units which are obtained by a combination of the basic or fundamental quantities are called ___________ quantities
A.derived
B.unit
C.fundamental
D.dimesion
Answer to question 8 is A. derived
Question 9 : A wire of cross-sectional area of 6×10−5m2
and length 50cm stretches by 0.2mm under a load of 3000N. Calculate the Young’s modulus for the wire
A.1.25×1011Nm−2
B.8×1010Nm−2
C.2.5×1011Nm−2
D.5×1011Nm−2
Question 10 : In the quantity ⃗a=ax⃗i+ay⃗j, ⃗j is the ___________ along the y-direction.
A.unit scalar
B.multiple unit
C.muttiple unit
D.unit vector
Answer to question 10 is A. unit scalar
Question 11 : In which of the following phenomena is surface tension important?
A.the floating of a boat in water
B.the floating of a plastic sphere in water
C.the floating of a ballon in air
D.the floating of a steel wire in water
Answer to question 11 is A. floating of a boat in water
Question 12 : ⃗i⋅⃗i=⃗j⋅⃗j=⃗k⋅⃗k=_________________
A.3
B.2
C.4
D.1
Answer to question 12 is D. 1
Question 13 : A _______________ quantity is completely specified by its magnitude and direction
A.measurement
B.scalar
C.vector
D.dimension
Answer to question 13 is C. vector
Question 14 : The process whereby molecules move from the region of high concentration to that of low concentration until equilibrium is established within the system is called _________
A.adhension
B.osmosis
C.diffusion
D.cohesion
Answer to question 14 is B. Osmosis
Question 15 : A string of natural length L extends to a new length L’ under tensile force F. If Hooke’S law applies, the work done in stretching the spring is ————
A.12FL
B.12(f−F′)
C.(f−F′)
D.12FL′
Answer to question 15 is try it yourself
Question 16 : Which of these is correct about viscosity?
A.it is does not vary from one liquid to another
B.both viscous force and upthrust act upwards
C.it varies with the relative velocity of the surfaces in contact
D.it increases with increase in temperature
Answer to question 16 is C. C.it varies with the relative velocity of the surfaces in contact
Question 17 : One of these is NOT a basic assumption of kinetic theory of ideal gases
A.the kinetic energy of the molecules is changing continuously
B.a gas consist of a large number of molecules
C.the attraction between the molecules is negligible
D.the gas molecules are in a state of continuous random motion
Answer to question 16 is B.a gas consist of a large number of molecules
Question 18 : The molecules of a liquid are held together by what type of forces?
A.surface tension forces
B.cohesive forces
C.adhesive forces
D.viscosity
Answer to question 18 is try it yourself
Question 19 : The ___________________ of a physical quantity is the relationship between the unit of the quantity and the units of the fundamntal quantities
A.unit
B.dimensonless
C.wide
D.dimension
Answer to question 19 is D dimension
Question 20 : All motions are ___________ butnot absolute
A.relative
B.parallel
C.Perpendicular
D.inertia
Answer to question 20 is A. relative
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