Slip-Test Type Questions

Question 1

Particles in a solid are

• Closely bound with no room for movement
• closely bound with room for vibration
• free flowing
  *

Answer 1

closely bound with room for vibration

Question 2

Hooke’s original law, relating to the stretching of materials, is the relationship between

• stress and strain
• load and extension

Answer 2

load and extension

Question 3

The quadrature component of a vector is

a) 45 degrees to the original
b) 90 degrees to the original
c) 180 degrees to the original

Answer 3

b) 90 degrees to the original

'’A vector representing an alternating quantity which is in quadrature (at 90^) with some reference vector.

Question 4

Two couples with magnitude F act against each other. The resultant will be.

a) -2F
b) 2F
c) 0

Question 5

Forces passing through a common point are said to be.

a) coherent
b) coplanar
c) concurrent

Answer 5

c) concurrent

Question 6

32) The advantage of using a machine is
a) mechanical advantage of input
b) mechanical advantage of output
c) input work is less than the output work

Question 7

A dot rotates around the circumference of a circle. If the vertical position of this dot is plotted on a graph with respect to time the result will be

a) a linear motion
b) a transverse waveform
c) a sinusoidal waveform

Answer 7

c) a sinusoidal waveform

Question 8

100 m is approximately

a) 220 yards
b) 109 yards
c) 66 yards

Answer 8

b) 109 yards

Question 9

Newton’s laws of motion apply to

a) solid substances only
b) all substances irrespective of state
c) gases and liquids only

Answer 9

a) solid substances only (acting as single point masses)

Question 10

What does ‘temperature of a body’ mean?

(a) How it radiates heat
(b) Its hotness

Answer 10

(b) Its hotness

Question 11

What is 1 BTU / lb in Joules per Kilogram?

(a) 4128 joules per kg
(b) 9.18 joules per kg
(c) 2326 joules per kg

Answer 11

(c) 2326 joules per kg

Remember 1 BTU = 1054 Joules

Question 12

Which type of circuit is used when the temperature of the source has insufficient heat for thermocouple application?

Answer 12

thermistor

Question 13

When a system undergoes a complete cycle where the net heat supplied is equal to work done plus a change in internal energy - this is known as

(a) 2nd law of thermodynamics
(b) First law of thermodynamics
(c) Ideal Gas Law

Answer 13

(b) First law of thermodynamics

Conservation of energy

Question 14

You are at the north pole where the temperatue is 50^C below freezing. What sort of thermometer would you use to measure it?

(a) Mercury
(b) Water
(c) Alcohol

Answer 14

(c) Alcohol

Question 15

The latent heat of fusion is the heat required to

a) change a liquid to a vapour
b) produce a rise in temperature of a liquid
c) change a solid to a liquid

Answer 15

c) change a solid to a liquid = latent heat of fusion

latent heat of vaporisation = change a liquid to a vapour(gas)

Question 16

Heat is defined as

(a) energy transfer due to molecular motion
(b) energy transfer resulting from a temperature difference

Answer 16

(b) energy transfer resulting from a temperature difference

Question 17

A material capable of going direct from a solid to gas is a

a) sublimate
b) substance
c) substrate

Answer 17

a)sublimate

Question 18

A process where heat is given off to its surroundings is called

a) isobaric
b) Isothermal
c) Adiabatic

Answer 18

b) Isothermal

‘Adiabatic’ is a process where No heat is given off to its surroundings.

Isobaric is constant pressure.

Isothermal, to keep constant temperature must give off heat as it is compressed

Question 19

The transmission of heat through a substance by the movement of free molecules is called

Answer 19

conduction

Question 20

The coefficient of cubic expansion of a material having a coefficient of linear expansion

10 x10^-6 / ^C is what?^-6

Answer 20

Remember

linear expansion = change in length = (a)(original length)(change in temp)

note cubic means volume

so remembring equation: Change in volume = 3(a)(original length)(change in temp)

mutiply original by 3 to get cublic / volume

answer = 30 x30^-6 /^C

Question 21

An ideal material for use as a heat exchanger will have a

a) low specific heat capacity and high conduction
b) high specific heat capacity and high conduction

Answer 21

b) high specific heat capacity and high conduction

Question 22

During the compression stroke of a 4-stroke engine, the work done on the air is 70 kJ/kg and the heat wasted is 40 kJ/kg. The change in internal energy of the air will be

a) 110 kj / kg
b) 30 kj/kg

Answer 22

Remember the first law of thermodynamics, energy cannot be created nor destroyed (conservation of energy)

b) 30 kj/kg

Question 23

Copper is used for soldering iron bits because it

a) has a high specific heat capacity
b) has a low specific heat capacity

Answer 23

b) has a low specific heat capacity

Low specific heat capacity means it heats up quickly with minimal energy input

Question 24

If heat is constant, and if pressure increases on a liquid what will the volume do?

a) decrease
b) increase
c) remain constant

Answer 24

c) remain constant

'’Liquids are considered incompressible, therefore their volume remains constant’’

Question 25

If a pressure on a liquid increases, whilst temperature is held constant, the volume will

a) decrease
b) remain constant
c) increase

Answer 25

b) remain constant

liquids are incompressible

Question 26

In a heat pump

a) flow across the condenser is always in one direction
b) the condenser loses heat

Answer 26

b) the condenser loses heat

‘Condenser always rejects heat

Question 27

Material A and Material B are both removed from the same oven at the same time, after being in the same amount of time.

Material A is a higher temperature than material B. This is because

a) material A has a higher specific heat capacity
b) material B has a higher specific heat capacity

Answer 27

b) material B has a higher specific heat capacity

Specific heat capacity

'’A substancce wth a high specific heat capacity can absorb a large quantity of heat before it will raise in temperature’’

Question 28

A chromatic aberration

a) can be removed by geometrical shaping of a single lens
b) can be compensated by using a gradient-index lens
c) can be compensated by using compound lens

Answer 28

a) can be removed by geometrical shaping of a single lens

Question 29

If a ray of light enters a fibre optic cable with a refractive index of 1.5, what is the speed of the ray in the cable?

Answer 29

remember

N = C /V

rearranging

V = C / N

V = 3 x 10⁸ m/s / 1.5

V = 200,000 km/s

Question 30

What is true in terms of angle of incidence and angle of reflection for mirrors

Answer 30

Mirror theory

The angle of incidence is equal to the angle of reflection

Question 31

What is the formula for snells law

Answer 31

sin i / sin r

where i = angle of incidence

r = angle of refraction

Question 32

The first overtone of a sound wave is the

a) 1st harmonic
b) 2nd harmonic
c) 3rd harmonic

Answer 32

b) 2nd harmonic

Question 33

What is the formula for Velocity of a sound?

Answer 33

V = lambda x f

where V = velocity (speed of sound etc)

lambda = wavelength

f = frequency

Question 34

The name given to sounds below that which the human ear can detech i.e 20 Hz? is

a) ultra sound
b) infra sound

Answer 34

b) infra sound

Question 35

Two sound waves of the same frequency and amplitude are moving half a wavelength out of phase with each other. What will be heard?

a) Half the volume of one of the sound waves
b) Nothing
c) Double the volume of one of the sound waves

Answer 35

b) Nothing

Question 36

Which of the following is an example of a Longitudinal Wave?

a) Sound wave
b) Radio wave
c) Light wavve

Answer 36

a) Sound wave

Question 37

The nodal points in a stationary wave are positioned

a) 1 wavelength apart
b) half a wavelength apart

Answer 37

b) half a wavelength apart

Question 38

The change in the direction of water waves travelling into shallower water is caused by

a) diffraction
b) refraction

Answer 38

b) refraction

Question 39

The quality of a musical tone is primarily related to its

a) fundamental frequency
b) overtones

Answer 39

b) overtones