Worksheets4NA Physics Revision [2023 version]
Total questions: 95
Worksheet time: 55mins
When you are given a speed-time graph, what does the area under that curve/line give you?
acceleration
distance travelled
instantaneous speed
Vernier calipers have inside jaws and outside jaws. What do outside jaws measure?
depth
thickness
internal diameter
external diameter
What does it mean when we say that object is under free-fall?
weight is the only force acting on it.
object is falling in air.
object is falling without being attached to other objects.
A body near to the surface of the Earth is acted upon by a constant gravitational force.
What is the approximate initial rate of change of velocity of this body in free-fall?
1 m/s
1 m/s2
10 m/s
10 m/s2
Which quantity describes the property of a body that resists a change in its motion?
density
inertia
moment
weight
Formula for weight, mass and gravitational field strength is
W = mg2
W= mg
W = m/g
Formulae to find acceleration ARE
a = F/m
a = (v - u) /t
a = M/g
a = Fm
Formula for moment is
M = F x d
M = F/d
To make an object more stable, we
increase the height
increase base area
increase position of centre of gravity
decrease position of centre of gravity
Formulae that allow you to find pressure ARE
P = F x A
P = F / A
F = P x A
F = P / A
When object is moving at constant speed, we know that
acceleration is increasing
acceleration is decreasing
acceleration is zero
resultant force is zero
When object is heated, it expands because
the molecules are getting bigger
the spaces between molecules increase
the molecules repel each other more
temperature of an object depends on
the average kinetic energy of the molecules
the average potential energy of the molecules
the material of an object
When question mentions about the colour and texture of the object, the answer that we should write is about
conduction
convection
radiation
When question mentions about the colour and texture of the object, the answer that we should write is about
the object is a better conductor
the object is a better absorber
Black surface is
a good absorber of heat via conduction
a good absorber of heat via radiation
a good emitter of heat via radiation
a good emitter of heat via conduction
When comparing why black teapot gets heated up faster than white teapot, we say
black is a good absorber of heat via radiation
black is a better absorber of heat via radiation than white
black is a good emitter of heat via radiation
black is a better emitter of heat via radiation than white
A thin plastic blanket, with a shiny metallic surface, is wrapped around a hiker who has collapsed after a steep climb.
Which is the main type of heat loss that the shiny surface is designed to reduce?
conduction
convection
evaporation
radiation
Ice at 0 oC is placed in warm water. The ice melts.
Which statement is correct?
The internal energy of the ice decreases.
The internal energy of the water decreases.
The temperature of the ice increases.
The temperature of the water increases.
Gamma ray is a
longitudinal wave.
transverse wave.
radio wave is a
longitudinal wave.
transverse wave.
Sound wave is a
longitudinal wave.
transverse wave.
Water wave is considered as
longitudinal wave.
transverse wave.
When the amplitude of the wave is increased, what is also increased?
frequency
loudness
pitch
wavelength
Formulae that can be used to find resistance are
R = V/I
R = (ρL)/A
R = Q/t
ALL formulae that can be used to find power are
P = E/t
P = VI
P = W.D / t
P = F x s
Two resistors, 2Ω and 4Ω, are connected in series. The total resistance across both of them is.
2Ω
4Ω
6Ω
1.33Ω
Two resistors, 2Ω and 4Ω, are connected in parallel. The total resistance across both of them is.
1.33 Ω
1.67 Ω
2Ω
6Ω
Formulae to find charge (Q) ARE
Q = I x t
Q = I / t
Q = V x W
Q = W/ V
The longer the cable,
the less resistance it has.
the more resistance it has.
The thicker the cable,
the higher the resistance.
the lower the resistance.
A mains electrical circuit uses insulated copper cable.
The cable overheats.
Which change prevents the cable from overheating?
use thicker copper cable which has less resistance
use thicker insulation which stops the heat escaping.
use thinner copper cable which has more resistance.
use thinner insulation which allows less heat to escape
During melting, is there change in temperature of the substance?
yes
no
There is no change in temperature during melting is because
energy is used to increase the average kinetic energy of the molecules
energy is used to break the inter-molecular bonds increasing internal potential energy but not internal kinetic energy
energy is lost to the surroundings
When we want to decide what fuse to use, we compare the operating current of the circuit to
fuse brand
fuse rating
fuse size
Two girls of the same weight climb a flight of stairs. Girl A finishes in 100 s and girl B finishes in 120 s. Which girl produces more power?
A
B
Elephant cannot change its direction quickly because of
inertia
weight
air resistance
leg muscles not strong enough
What does it mean when we say that object is under free-fall?
weight is the resultant force
resultant force is zero
object is falling without being attached to other objects.
Black surface is heated up faster than white because black surface is
a good absorber of heat via conduction
a good absorber of heat via radiation
a good emitter of heat via radiation
a good emitter of heat via conduction
What is the average speed of the journey from Tanjong Pagar to Tuas?
When resultant force on an object is zero, there is no force acting on it.
False
True
A satellite is launched into space from Earth. What effect does this have on the satellite's mass and weight?
mass:decrease; weight: same
mass: increase; weight: same
mass: same; weight: decrease
mass: same; weight: increase
Which quantities can be determined from the graph?
amplitude and wavelength
amplitude and period
period and wavelength
wavelength and speed
CONVENTIONAL current direction is from
positive terminal to negative terminal
negative terminal to positive terminal
clockwise
anticlockwise
Electron flows from
positive terminal to negative terminal
negative terminal to positive terminal
clockwise
anticlockwise
What is the relationship between V1 and V2 ?
In distance-time graph, the gradient gives value for
speed
acceleration
distance
time
The word conductor is used for which process?
convection
radiation
conduction
Which situation is most likely to cause a fire?
connecting multiple appliances to a power socket
damaged insulation resulting in exposed wiring
disconnected earth wire
wet power socket
The smart lock is able to transmit information on the location of the bicycle to its owner through a satellite. Microwaves are used in satellite transmission. They have a frequency of 6.2 GHz and a wavelength of 0.048 m.
What is the speed of the microwaves?
3 x 108 m/s
2.98 x 108 m/s
330 m/s
When an object is moving at constant speed, we know that
acceleration is zero
resultant force is zero
mass is zero
weight is zero
When presenting your work, for number, the final answer is given to
1 s.f
2 s.f
3 s.f
1 d.p
When presenting your work, for angle, the final answer is given to
1 s.f
2 s.f
3 s.f
1 d.p
melting point of a substance is the same as
boiling point
freezing point
evaporation point
Tiny particles are always
vibrating
in random and continuous motion
swinging
jiggling
When water surrounding heater is heated, it expands, becomes
more dense and sinks
less dense and rises
bigger and rises
smaller and sinks
When water surrounding heater is heated, it _________, becomes less dense and rises.
contracts
expands
remains the same
When water surrounding ice is cooled, it _________, becomes more dense and sinks.
contracts
expands
remains the same
A perpendicular distance is a distance between
pivot and the edge of the beam
pivot and the line of action of the force
pivot and middle of the beam
When object is in equilibrium, the followings are true
resultant force is zero
resultant mass is zero
resultant moment is zero
resultant weight is zero
net moment: 25; direction: clockwise
net moment: 45; direction: anti-clockwise
net moment: 60; direction: clockwise
net moment: 71; direction: anti-clockwise
Solids are incompressible because
the particles are able to slide past each other
the particles are vibrating at their own position
the particles are in random arrangement
the particles are closely packed
Rate of emission and absorption of infrared radiation of an object is affected by
mass of the object
surface temperature of the object
surface area of the object
colour of surface of the object
Speed of ultraviolet in vacuum is
298,000,000 m/s
300,000,000 m/s
330 m/s
infinite
The kilowatt hours is a unit of
charge
current
energy
power
1 kWh is equal to
360 J
3,600,000 J
1 J
3600 J
Which are the advantages of a parallel circuit?
- if a bulb blows, the other bulbs in the circuit still work.
- The bulbs will be brighter if they are connected in parallel.
- the battery life can last longer if components are connected in parallel.
1
1 and 2 only
2 and 3 only
1 and 3 only
Why is the switch of any electrical device always fitted to the live wire?
the device can be disconnected from high potential when the switch is on the live wire
there is no current flowing in both earth and neutral wire
the device will no be overloaded when it is plugged into the socket
the fuse will not melt when the switch is fitted to the live wire
Appliances that use two-pin plugs are double insulated. What does it mean "double insulated"? Select all that apply.
Electric cables are insulated from the internal components of the appliance
Internal components of the appliance is insulated from external casing
Cables are wrapped around with plastic twice
Appliance is made of plastic only
P = VI and P = E/t, what is E equal to
VIt
VI/t
Vt/I
Match the following quantities and units of measurement
kilograms
mass
Meters
Length
Kelvin
Temperature
Liters
Volume
Seconds
Time
The diagram shows a circuit.
Where must an ammeter be connected to measure the smallest current?
A
B
C
D
Two resistors of resistances 30 Ω and 60 Ω are arranged in parallel. The current in the 30 Ω resistor is 0.60 A.
What is the potential difference across the 60 Ω resistor?
9.0 V
18 V
36 V
54 V
The circuit shows three resistors in series connected to a battery. Each resistor has a voltmeter across it and two of the voltages are shown.
What is the potential difference (p.d.) across the resistor R?
12 V
22 V
30 V
68 V
The currents in different parts of the circuit are I1, I2, I3 and I4.
Which statement is correct?
I1 = I4 and I2 is greater than I3.
I1 = I4 and I3 is greater than I2.
I2 is greater than I1 and less than I3.
I2 is greater than I1 and greater than I3.
The diagram shows a circuit that has two resistors in series with a 12 V supply.
What is the current in the circuit?
2.4 A
10 A
14 A
60 A
An ammeter is connected to three resistors and a power supply.
Which arrangement of resistors gives the greatest ammeter reading?
A
B
C
D
Match the Unit to its quantity
Ampere
Current
Watt
Power
Volt
Voltage
Joule
Energy
Ω
Resistance
The effective resistance is _____
3 Ohm
6 Ohm
12 Ohm
Current through the battery is ____
0.5 A
1 A
2 A
4 A
The effective resistance is ____
2 Ohm
4 Ohm
8 Ohm
11 Ohm
Potential difference across each resistor is ____
3 V
6 V
12 V
Current through Y is ____
1 A
2 A
5 A
10 A
Which of the following appliances makes use of the heating effect of electricity?
Electric escalator
Electric fan
Electric rice cooker
Fluorescent lamp
The cost of electricity is 27 cents per kWh. What is the cost of using a 1000–1200 W iron at maximum power for 45 minutes?
12.2 cents
14.6 cents
24.3 cents
1458 cents
A fuse blows when a light is switched on in a house. The house owner replaces the fuse, but the second fuse also fails. The house owner then uses a third fuse with a higher rating. Why is this not recommended?
Using a fuse with too high a rating will cause electric shocks.
Fuses allow the circuit to work only if the rating is exactly right.
Using a fuse with a higher rating might allow the circuit to work, but the fault is not corrected.
The fuse with a higher rating will definitely not work, as it allows a smaller current to pass through it before melting.
The power rating and the duration of usage of four electrical appliances are summarised in the table.
Which appliance consumes the most energy?
Fan
Lamp
Rice cooker
Washing machine
A student draws a circuit, shown below, to show how an appliance should be connected to a fuse and the household mains.
Identify the error in the circuit.
The fuse rating is too high.
The fuse rating is too low.
The fuse is connected wrongly.
The switch is connected wrongly.
When a appliance is working properly in Singapore, the Potential Differential at the Live (L), Neutral (N) and Earth (E) wires should be _____
(L) - 240V, (N) - 240V, (E) - 240V
(L) - 240V, (N) - 0V, (E) - 240V
(L) - 240V, (N) - 0V, (E) - 0V
(L) - 240V, (N) - 240V, (E) - 0V
What type of appliances would you most likely find safety label like this?
Appliances with 3-pin plugs.
Appliances with Earth wires.
Appliance with plastic casing.
Appliances with metal casing.
