NOUN E-Exam Past Questions: PHY101/113 - Elementary Mechanics, Heat and Properties of Matter

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The of a force about a point is measured

by the product of the force and the perpendicular distance from the

line of action of the force to the point.

moment torque

FBQ A body is one in which the constituent

parts have fixed distances from each other.

rigid rigid

FBQ The sharpness of the curve is called the

Q-factor

resonance resonance

FBQ

occurs when the driving frequency is the

same as the natural frequency of the oscillator resulting in a

maximum amplitude of oscillation

Resonance Resonance

FBQ A oscillation is one for which periodic

impulse drives it against resistive forces

forced driven

FBQ A heavily motion is one for which no

oscillation occurs when it is released.

damped damped

FBQ oscillation is one for which the

amplitude of oscillation is constant in the absence of resistive forces

Undamped Free

FBQ

An oscillation is said to be if its

amplitude of the oscillation gradually decreases to zero over time as

a result of resistive force arising from the surrounding medium

damped damped

FBQ

During simple harmonic motion of an object, there is a constant

interchange of of the object between its

kinetic and potential forms

energy energy

FBQ

If the displcacement from its equilibrium position of a particle

undergoing simple harmonic motion is very small, the

force obeys Hooke's law

restoring restoring

FBQ

The displacement, velocity and acceleration of a particle undergoing

a simple harmonic motion could be represented by a

function

sinusoidal sinusoidal

FBQ

A simple harmonic motion is a periodic vibration of a body whose

acceleration is directly proportional to its

from a fixed point and is always directed towards this point i.e. a = -

constant x

distance displacement

FBQ force is required for a simple harmonic

motion to continue

restoring restoring

FBQ A joule is a unit of Work energy

FBQ 1 horse power is equal to W 746 746

FBQ A physical quantity which has the same dimensions as moment of a

force is work work

FBQ Liquids which make angles of contact do

not wet the surfaces of their containers

obtuse obtuse

FBQ Mecury in a glass tube forms meniscus. convex convex

FBQ

Lead shots are manufactured by spraying molten lead from a height

so that they form spheres as they fall through the air under the

influence of the force of gravity. The forces responsible for the

formation of the spheres are forces.

surface tension surface tension

FBQ

force between glass and water molecules

is greater than the force between water

molecules.

adhesive, cohesive adhesive, cohesive

FBQ The angle of contact for clean water and clean glass is

_. zero 0

FBQ

The coefficient of is defined as the force

per unit length acting normally on one side of a line on the surface

of a liquid

surface tension surface tension

FBQ

Two neighbouring layers of a fluid have different velocities 4cm/s

and 2cm/s respectively They are seperated by a distance of 4cm.

Their average velocity gradient is /s to

one place of decimal

0.5 0.5

FBQ

A person standing close to a fast moving trai experinces suction

effect. This is an application of __'s

principle

Bernoulli Bernoulli

FBQ Poise is the SI unit of _. coefficient of viscosity coefficient of viscosity

FBQ

The frictional force required to maintain a unit velocity gradient

between two layers of a fluid in relative motion, each of a unit area,

is the coefficient of _.

viscosity viscosity

FBQ

The viscous force F acting on a spherical body of radius r moving

through a viscous fluid at velocity v is given as $F=6\pi\eta{r}v$.

This is __'s law.

Stoke Stoke

FBQ An object falling freely through a viscous fluid soon attains a

maximum andd constant velocity called terminal velocity terminal velocity

FBQ

The equation $P + \frac{1}{2}\rho{v^{2}} +\rho{gy }= consant$,

where $\rho$ stands for density, P for pressure, v for fluid velocity, g

the acceleration due to gravity and y the height is

_'s equation

Bernoulli Bernoulli

FBQ The term defines frictional force in

fluids

viscosity viscosity

FBQ

The term flow is used to describe

uniform and non-turbulent flow of a fluid, assuming the liquid is

incompressible.

laminar laminar

FBQ

law states that if two systems A and B

are seperately in thermal equilibrium with a third system C, then

they are in thermal equilibrium with each other

zeroth zeroth

FBQ The path followed by a fluid particle in a steady flow as it travels the

length of a pipe is referred to as streamline streamline

FBQ 's apparatus is used to compare the

relative densities of two different liquids

Hare Hare

FBQ __'s principle explain the uniform or

equal transmission of pressure in all directions in a fluid

Pascal Pascal

FBQ

A body wholly or partially immersed in a fluid experience

which is equal to the weight of the fluid

displaced

upthrust bouyant force

FBQ

The kinetic energy per degree of freedom of a molecule of a

monoatomic gas can be given interms of k and T where the symbols

have thier usual meaning, as KE = . You

may choose your answer from the list:(3kT/2, kT/3, kT/2, kT)

kT/2 kT/2

FBQ

distribution is concerned with the

distribution molecular speeds of a given closed system at a

particular temperature

Maxwell Maxwell

FBQ In the equation E = Tensile stress/tensile strain, E stands for

__'s modulus of elasticity Young Young

FBQ A material that can easily be drawn into a wire as it undergoes

plastic deformation is said te be ductile ductile

FBQ

point is reached when the molecules of a

loaded piece of wire begin to slide past each other as it exceeds its

elastic limit

yield yield

FBQ

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

diffusion diffusion

FBQ $$\vec{i}\cdot\vec{i}=\vec{j}\cdot\vec{j}=\vec{k}\cdot\vec{k}$$= 1 1

FBQ In the quantity $$\vec{a}=a_{x}\vec{i}+a_{y}\vec{j}$$,

$$\vec{j}$$ is the along the y-direction. unit vector unit vector

FBQ A quantity is completely specified by its

magnitude and direction

vector vector

FBQ Work and moment of a force have the same dimension dimensions

FBQ

The of a physical quantity is the

relationship between the unit of the quantity and the units of the

fundamntal quantities

dimension dimension

FBQ

Quantities units which are obtained by a combination of the basic or

fundamental quantities are called

quantities

derived derived

FBQ All motions are and not absolute relative relative

FBQ A of reference is a set of coordinate axes

used to describe the motion of an object.

frame frame

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## NOUN E-Exam Past Questions: PHY101/113 - Elementary Mechanics, Heat and Properties of Matter

### Re: NOUN E-Exam Past Questions: PHY101/113 - Elementary Mechanics, Heat and Properties of Matter

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Q76 The term that best describes the need to hold the butt of a riffle firmly against the shoulder when firing to minimise impact on the shoulder is

recoil velocity

Q77 A mass accelerates uniformly when the resultant force acting on it

is cons tant but not zero

Q78 A ball is kicked and flies from point P to Q following a parabolic path in which the highest point reached is T. The acceleration of the ball is

the same at P as at Q and T

Q79 How fast must a ball be rolled along the surface of a 70-cm high table so that when it rolls off the edge it will strike the floor at the same distance (70cm) from the point directly below the edge of the table?

185.2 cm/s

Q80 The motion of a ball rolling down a ramp is one with

constant acceleration

Q81 The trajectory of a projectile is

a parab ola

Q82 A cart is moving horizontally along a straight line with constant speed of 30 m/s. A projectile is fired from the moving cart in such a way that it will return to the cart after the cart has moved 80 m. At what speed (relative to the cart) and at what angle (to the horizontal) must the projectile be fired?

35.8 m/s at 24 degrees

Q83 What is common to the variation in the range and the height of a projectile?

time of flight vertic al velocity, horizontal acceleration

Q84 A stone thrown from ground level returns to the same level 4 s after. With what speed was the stone thrown? Take $g = 10ms^{-2}$

20 m/s

Q85 An object is thrown upward from the edge of a tall building with a velocity of 10 m/s. Where will the object be 3 s after it is thrown? Take $g = 10ms^{-2}$

15 m below the top of the building

Q86 A body hangs from a spring balance supported from the roof of an elavator. If the elavator has an upward acceleration of $3ms^{-2}$ and the balance reads 50 N, what is the true weight of the body?

38.3 N

Q87 Which of the following contributes to the instability of an object?

low centre of gravity

Q88 A rope suspended from a ceiling supports an object of weight W at its opposite end. Another rope tied to the first at the middle is pulled horizontally with a force of 30N. The junction P of the ropes is in equilibrium. Calculate the weight W and the tension T in the upper part of the first rope

27.2N and 39.2N

Q89 Which of the following does NOT refer to the terms description of stability of on an object?

central equilibrium

Q90 Which of the following physical concepts best explains why passengers in fast moving cars should always fasten their seat-belts?

inertia

Q91 A 50kg boy suspends himself from a point on a rope tied horizontally between two vertical poles. The two segments of the rope are then inclined at angles 30 degrees and 60 degrees respectively to the horizontal.The tensions in the segments of the rope in newtons are

25.0 and 43.3

Q92 A boy intends to move an m-kg crate across the floor by applying a constant force P newtons on it.The coeficient of friction between the floor and the crate is $\mu$. Which of these is the best option for his task?

Pull the crate with P inclined at an angle above the horizontal

Q93 A man leaves the garrage in his house and drives to a neighbouring town which is twenty kilometers away from his house on sight-seeing. He returns home to his garrage two hours after. What is his average velocity from home in km/h?

0

Q94 The resultant of vectors $\vec{A}$ and $\vec{B}$ has a magnitude of 20 units.$\vec{A}$ has a magnitude of 8 units, and the angle between $\vec{A}$ and $\vec{B}$ is $40^{o}$. Calculate the magnitude of $\vec{B}$

14.8

Q95 Given three vectors $\vec{a} = {-}\vec{i}{-}4\vec{j}+2\vec{k}$, $\vec{b} = 3\vec{i}+2\vec{j}-2\vec{k}$, $\vec{c} = 2\vec{i}{-}3\vec{j}+\vec{k}$, calculate $\vec{a}\cdot(\vec{b}\times\vec{c})$

${-6}$

Q96 Two forces act on a point object as follows: 100 N at $170^{o}$ and 100N at $50^{o}$. Find the resultant force

100 N at $50^{o}$

Q97 The speed of 90 hm/hr is equal to ------------------ m/s

25

Q98 What are the dimensions of power (time rate of change of expending energy)

$ML^2T^{-3 }$

Q99 Which of the following statements is not correct about reference frames?

In non-inertial reference frames the motion of objects depend only on the interac tions of constituent particles among themselves

Q100 A passenger in a moving car and a passerby standing at the road side see each other as moving in the opposite direction. Which of the following is NOT true?

The passer-by is stationary relative to the passenger

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Q76 The term that best describes the need to hold the butt of a riffle firmly against the shoulder when firing to minimise impact on the shoulder is

recoil velocity

Q77 A mass accelerates uniformly when the resultant force acting on it

is cons tant but not zero

Q78 A ball is kicked and flies from point P to Q following a parabolic path in which the highest point reached is T. The acceleration of the ball is

the same at P as at Q and T

Q79 How fast must a ball be rolled along the surface of a 70-cm high table so that when it rolls off the edge it will strike the floor at the same distance (70cm) from the point directly below the edge of the table?

185.2 cm/s

Q80 The motion of a ball rolling down a ramp is one with

constant acceleration

Q81 The trajectory of a projectile is

a parab ola

Q82 A cart is moving horizontally along a straight line with constant speed of 30 m/s. A projectile is fired from the moving cart in such a way that it will return to the cart after the cart has moved 80 m. At what speed (relative to the cart) and at what angle (to the horizontal) must the projectile be fired?

35.8 m/s at 24 degrees

Q83 What is common to the variation in the range and the height of a projectile?

time of flight vertic al velocity, horizontal acceleration

Q84 A stone thrown from ground level returns to the same level 4 s after. With what speed was the stone thrown? Take $g = 10ms^{-2}$

20 m/s

Q85 An object is thrown upward from the edge of a tall building with a velocity of 10 m/s. Where will the object be 3 s after it is thrown? Take $g = 10ms^{-2}$

15 m below the top of the building

Q86 A body hangs from a spring balance supported from the roof of an elavator. If the elavator has an upward acceleration of $3ms^{-2}$ and the balance reads 50 N, what is the true weight of the body?

38.3 N

Q87 Which of the following contributes to the instability of an object?

low centre of gravity

Q88 A rope suspended from a ceiling supports an object of weight W at its opposite end. Another rope tied to the first at the middle is pulled horizontally with a force of 30N. The junction P of the ropes is in equilibrium. Calculate the weight W and the tension T in the upper part of the first rope

27.2N and 39.2N

Q89 Which of the following does NOT refer to the terms description of stability of on an object?

central equilibrium

Q90 Which of the following physical concepts best explains why passengers in fast moving cars should always fasten their seat-belts?

inertia

Q91 A 50kg boy suspends himself from a point on a rope tied horizontally between two vertical poles. The two segments of the rope are then inclined at angles 30 degrees and 60 degrees respectively to the horizontal.The tensions in the segments of the rope in newtons are

25.0 and 43.3

Q92 A boy intends to move an m-kg crate across the floor by applying a constant force P newtons on it.The coeficient of friction between the floor and the crate is $\mu$. Which of these is the best option for his task?

Pull the crate with P inclined at an angle above the horizontal

Q93 A man leaves the garrage in his house and drives to a neighbouring town which is twenty kilometers away from his house on sight-seeing. He returns home to his garrage two hours after. What is his average velocity from home in km/h?

0

Q94 The resultant of vectors $\vec{A}$ and $\vec{B}$ has a magnitude of 20 units.$\vec{A}$ has a magnitude of 8 units, and the angle between $\vec{A}$ and $\vec{B}$ is $40^{o}$. Calculate the magnitude of $\vec{B}$

14.8

Q95 Given three vectors $\vec{a} = {-}\vec{i}{-}4\vec{j}+2\vec{k}$, $\vec{b} = 3\vec{i}+2\vec{j}-2\vec{k}$, $\vec{c} = 2\vec{i}{-}3\vec{j}+\vec{k}$, calculate $\vec{a}\cdot(\vec{b}\times\vec{c})$

${-6}$

Q96 Two forces act on a point object as follows: 100 N at $170^{o}$ and 100N at $50^{o}$. Find the resultant force

100 N at $50^{o}$

Q97 The speed of 90 hm/hr is equal to ------------------ m/s

25

Q98 What are the dimensions of power (time rate of change of expending energy)

$ML^2T^{-3 }$

Q99 Which of the following statements is not correct about reference frames?

In non-inertial reference frames the motion of objects depend only on the interac tions of constituent particles among themselves

Q100 A passenger in a moving car and a passerby standing at the road side see each other as moving in the opposite direction. Which of the following is NOT true?

The passer-by is stationary relative to the passenger

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### Re: NOUN E-Exam Past Questions: PHY101/113 - Elementary Mechanics, Heat and Properties of Matter

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DISCLAIMER: THIS PACKAGE IS PREPARED FOR EXAM REVISION AND PREPARATIONS ONLY, NOT TO BE TAKEN INTO THE EXAM HALL FOR MALPRACTICES

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Q51 Which of the following substances has the highest viscosity at room temperature?

palm oil

Q52 In which of the following phenomena is surface tension important?

the floating of a steel wire in w ater

Q53 Which of these is correct about viscosity?

it varies with the relative velocity of the surfaces in contact

Q54 The molecules of a liquid are held together by what type of forces?

cohesive forces

Q55 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 ------------

1/2 F(L -L')

Q56 A wire of cross-sectional area of $6\times10{-5}m^{2}$ and length 50cm stretches by 0.2mm under a load of 3000N. Calculate the Young’s modulus for the wire

$1.25\times10^{11}Nm^{-2}$

Q57 The mechanism of heat transfer from one point to another through vibration of the molecules of the medium is called -------------

conduction

Q58 One of these is an example of thermal radiation detector

thermome ter

Q59 One of these is NOT a basic assumption of kinetic theory of ideal gases

the kinetic energy of the molecules is changing co ntinuously

Q60 Thermal expansion of a solid material depends on the following EXCEPT

average translational motion of co nstituent atoms of the material

Q61 An electric kettle contains 1.5 kg of water at $$100 ^{o}$$ and powered by a 2.0 kW electric element. If the thermostat of the kettle fails to operate, approximately how long will it take for the kettle boil dry?

(Take the specific latent heat of vaporization of water as $2000kJkg^{-1}) $

1500s

Q62 Given that the specific capacity of ice is one-half that of water, does is take more thermal energy to raise the temperature of 5 g of water or 5 g of ice by $$6^{o}C?$$

Water

Q63 The method of mixtures as a means of measuring the amount of heat of a substance depends of the principle of conservation of

energy

Q64 Which of the following is NOT true?

boiling takes place only at the surface of the liqui d

Q65 The statement "the specific latent heat of fusion of ice is $3.3\times 10^{5}$J/kg" means

$ 3.3\times 10^{5}$J of heat energy is required to change 1 kg of pure ice at$ 0^{o}$C to 1kg of water at $0^{o}$C

Q66 The amount of heat stored in a substance depends on all of the following EXCEPT

shape of the substance

Q67 Which of the following is NOT an effect of heat on a substance?

convection

Q68 The absolute zero temperature refers to the temperature at which

theoretically all thermal motions will cease

Q69 Tin melts at 232 under standard atmospheric pressure. Express this temperature in kelvin

505.15K

Q70 When the junctions of two dissimilar metals are maintained at different temperatures an electromotive force is is set up in the circuit of which these junctions are a part. A pair of juntions of this kind is known as

thermocouple

Q71 On what thermometric property does the working of a thermistor depend?

change in electrical resistance with change in temperatue

Q72 An ungraduated mercury thermometer attached to a millimeter scale reads 22.8mm in ice and 242mm in steam at standard pressure. What will the millimeter read when the temperature is 20^{o} C?

66.64mm

Q73 A wall or partition that allows free exchange of heat energy between two systems is referred to as -----

upper fixed point and the Lower fixed point

Q74 The fundamental interval of a thermometric scale is

the difference betwee n the upper and the lower fixed points

Q75 Which of the following is NOT a thermometric property?

the density of a liquid

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DISCLAIMER: THIS PACKAGE IS PREPARED FOR EXAM REVISION AND PREPARATIONS ONLY, NOT TO BE TAKEN INTO THE EXAM HALL FOR MALPRACTICES

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Q51 Which of the following substances has the highest viscosity at room temperature?

palm oil

Q52 In which of the following phenomena is surface tension important?

the floating of a steel wire in w ater

Q53 Which of these is correct about viscosity?

it varies with the relative velocity of the surfaces in contact

Q54 The molecules of a liquid are held together by what type of forces?

cohesive forces

Q55 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 ------------

1/2 F(L -L')

Q56 A wire of cross-sectional area of $6\times10{-5}m^{2}$ and length 50cm stretches by 0.2mm under a load of 3000N. Calculate the Young’s modulus for the wire

$1.25\times10^{11}Nm^{-2}$

Q57 The mechanism of heat transfer from one point to another through vibration of the molecules of the medium is called -------------

conduction

Q58 One of these is an example of thermal radiation detector

thermome ter

Q59 One of these is NOT a basic assumption of kinetic theory of ideal gases

the kinetic energy of the molecules is changing co ntinuously

Q60 Thermal expansion of a solid material depends on the following EXCEPT

average translational motion of co nstituent atoms of the material

Q61 An electric kettle contains 1.5 kg of water at $$100 ^{o}$$ and powered by a 2.0 kW electric element. If the thermostat of the kettle fails to operate, approximately how long will it take for the kettle boil dry?

(Take the specific latent heat of vaporization of water as $2000kJkg^{-1}) $

1500s

Q62 Given that the specific capacity of ice is one-half that of water, does is take more thermal energy to raise the temperature of 5 g of water or 5 g of ice by $$6^{o}C?$$

Water

Q63 The method of mixtures as a means of measuring the amount of heat of a substance depends of the principle of conservation of

energy

Q64 Which of the following is NOT true?

boiling takes place only at the surface of the liqui d

Q65 The statement "the specific latent heat of fusion of ice is $3.3\times 10^{5}$J/kg" means

$ 3.3\times 10^{5}$J of heat energy is required to change 1 kg of pure ice at$ 0^{o}$C to 1kg of water at $0^{o}$C

Q66 The amount of heat stored in a substance depends on all of the following EXCEPT

shape of the substance

Q67 Which of the following is NOT an effect of heat on a substance?

convection

Q68 The absolute zero temperature refers to the temperature at which

theoretically all thermal motions will cease

Q69 Tin melts at 232 under standard atmospheric pressure. Express this temperature in kelvin

505.15K

Q70 When the junctions of two dissimilar metals are maintained at different temperatures an electromotive force is is set up in the circuit of which these junctions are a part. A pair of juntions of this kind is known as

thermocouple

Q71 On what thermometric property does the working of a thermistor depend?

change in electrical resistance with change in temperatue

Q72 An ungraduated mercury thermometer attached to a millimeter scale reads 22.8mm in ice and 242mm in steam at standard pressure. What will the millimeter read when the temperature is 20^{o} C?

66.64mm

Q73 A wall or partition that allows free exchange of heat energy between two systems is referred to as -----

upper fixed point and the Lower fixed point

Q74 The fundamental interval of a thermometric scale is

the difference betwee n the upper and the lower fixed points

Q75 Which of the following is NOT a thermometric property?

the density of a liquid

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