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50 questions
what is the density of the liquid?
0.60 g/cm3
0.67 g/cm3
1.5 g/cm3
1.7 g/cm3
A
B
C
D
Which statement about the ball is correct?
Ball P has the greatest acceleration.
Balls Q and R take the same time to fall to the ground
The acceleration of ball R is half the acceleration of ball P.
Ball S has the greatest average speed
A metal has a specific heat capacity of 360 J/(kg°C). An object made of this metal has a mass of 2.0 kg.
What is the thermal capacity (heat capacity) of the object?
720 J/°C
180 J/°C
720 J/kg
180 J/kg
A person uses a surfboard to ride every 30th wave crest towards the beach. The wave crest travels at a speed of 1.6m / s and the distance between each wave crest is 24m.
How many wave crests does the person surf in one hour?
1
2
8
450
What correctly expresses the volt in terms of SI base units?
AΩ
W A–1
kg m2 s–3 A–1
kg m2 s–1 A–1
A small compass is placed close to a strong bar magnet, the same distance from each end.
Which diagram shows the direction in which the compass needle points?
A
B
C
D
Which particles move in a metal to cause an electric current?
electrons
neutrons
protons
nucleons
Four circuits are set up.
In which circuit does the ammeter show the greatest reading?
A
B
C
D
Which pair causes the bell to ring?
bright light and low temperature
bright light and high temperature
dim light and low temperature
dim light and high temperature
Which type of logic gate is it?
AND
OR
NOT
NOR
The diagrams show four solid cones. The centre of mass of each cone is marked by a point labelled M.
Which cone is the most stable?
A
B
C
D
What does a barometer measure?
the current in a circuit
the density of a liquid
the pressure of the air
the temperature of an object
A circular metal disc is heated.
Which quantity decreases?
its density
its volume
its diameter
its thickness
Which group contains only electromagnetic waves?
light waves, radio waves, sound waves
light waves, radio waves, γ-rays
light waves, sound waves, γ-rays
radio waves, sound waves, γ-rays
Which of the rays has the student drawn correctly?
ray X and ray Y
ray X and ray Z
ray Y only
ray Z only
A student cycles along a level road at a speed of 5.0 m / s.
The total mass of the student and bicycle is 120 kg.
The student applies the brakes and stops. The braking distance is 10 m.
What is the average braking force?
30 000 N
15 000 N
300 N
150 N
A submarine is 20 m below the surface of the sea. The pressure due to the water at this depth is P.
On another day, the submarine is 26 m below the surface of fresh water.
The density of sea water is 1.3 times the density of fresh water.
What is the pressure due to the fresh water at a depth of 26 m?
P / 1.3
P
1.3 P
1.7 P
A block of copper has a mass of 2.0 kg.
The block of copper absorbs 12 000 J thermal energy.
The specific heat capacity of copper is 385 J / (kg °C).
What is the temperature rise of the copper?
15.6 °C
31.2 °C
46.8 °C
62.4 °C
Light has a speed of 1.24 × 108 m / s in diamond.
What is the refractive index of diamond?
0.41
1.54
2.42
3.72
Which statement describes monochromatic light?
light that does not diffract
light that has a single frequency
light that spreads out when shone through a glass prism
light that travels at the same speed in all materials
In an electric circuit, 40 C of electric charge pass a point in 5.0 s.
What is the current in the circuit?
0.3 A
8.0 A
45 A
200 A
A circuit contains four ammeters and three resistors with different values. Which ammeter shows the largest reading?
A
B
C
D
The diagrams show pairs of circuits containing logic gates.
In which diagram does the lower circuit of the pair not behave in the same way as the upper circuit?
A
B
C
D
How can the turning effect be increased?
Reduce the size of the current
Increase the number of turns on the coil
Use thinner wire for the coil
Reverse the direction of the magnetic field.
What input voltage is needed to give an output voltage of 240 V?
12 V
20 V
2880 V
3600 V
Four lamps are each labelled '60 W 230 V'.
In which circuit are the lamps connected so that they operate at normal brightness?
A
B
C
D
A block of copper and a block of lead are heated. The internal energy of each block increases by the same amount.
The block of copper has a lower thermal capacity than the block of lead.
Which conclusion can be made from this information?
The temperature increase of the copper is greater than the temperature increase of the lead
The temperature increase of the copper is the same as the temperature increase of the lead.
The temperature increase of the copper is less than the temperature increase of the lead.
The melting point of copper is lower than the melting point of lead.
A stone of mass 0.12 kg is fired from a catapult. The velocity of the stone changes from 0 to 5.0 m / s in 0.60 s.
What is the average resultant force acting on the stone while it is being fired?
0.5 N
1.0 N
2.5 N
8.3 N
When does an object falling vertically through the air reach terminal velocity?
when the acceleration of the object becomes negative
when the acceleration of the object is equal to g
when the air resistance equals the weight of the object
when the air resistance is greater than the weight of the object
A ball of mass 1.2 kg is dropped from a height of 30 m. As it falls, 25% of its initial gravitational potential energy is transferred to thermal energy.
What is the kinetic energy of the ball just before it hits the ground?
27 J
90 J
270 J
360 J
An oil tank has a base of area 2.5 m2 and is filled with oil to a depth of 1.2 m.
The density of the oil is 800 kg / m3.
What is the force exerted on the base of the tank due to the oil?
960 N
2400 N
9600 N
24 000 N
Light travels at a speed of 2.0 × 108 m / s in a glass block.
In the glass, the wavelength of the light is 4.0 × 10–7 m.
What is the frequency of the light?
2.0 x 10-15 Hz
1.3 x 10-2 Hz
80 Hz
5.0 x 1014 Hz
What is angle θ ?
37o
39o
51o
53o
A water heater is connected to a 230 V supply and there is a current of 26 A in the heater. It takes 20 minutes to heat the water to the required temperature.
How much energy is supplied by the heater?
6.0 × 103 J
1.0 × 104 J
1.2 × 105 J
7.2 × 106 J
What is the magnitude of force F ?
8.0 N
18 N
22 N
44 N
What force does the racket exert on the ball?
0.018 N
0.078 N
18 N
78 N
An aluminium block has a mass of 200 g.
The specific heat capacity of aluminium is 900 J / (kg °C).
How much energy is needed to raise the temperature of the block from 20 °C to 110 °C?
2.0 J
200 J
16 200 J
16 200 000 J
Which statement about convection currents is correct?
Convection currents occur because, when warmed, liquids expand and become more dense.
Convection currents occur because, when cooled, liquids contract and become more dense
Convection currents only occur in liquids.
Convection currents only occur in solids and liquids.
A laser is a source of light with a single frequency.
Which description of this type of light is correct?
dispersed
focused
monochromatic
refracted
The Moon is 380 000 km from the Earth. A laser light beam is directed from the Earth to the Moon. The beam is reflected back to the Earth.
How long does it take for the light to travel to the Moon and back to the Earth?
1.27 ms
2.53 ms
1.27 s
2.53 s
Which wavefront is travelling at a speed closest to that of a sound wave through a solid?
one that moves 10 m in 0.01 s
one that moves 50 m in 0.5 s
one that moves 1000 m in 100 s
one that moves 2000 m in 2000 s
A student stands 180 m in front of a vertical, flat cliff and bangs together two pieces of wood to make a short, loud sound.
A timer records the echo of the sound 1.5 seconds after the pieces of wood are banged together.
Based on this result, what is the speed of sound?
120 m/s
240 m/s
270 m/s
540 m/s
How can a permanent magnet be demagnetised?
Cool the magnet for a long time
Place it next to another magnet.
Slowly pull it out of a coil connected to an a.c. supply
Slowly pull it out of a coil connected to a d.c. supply.
What is meant by the half-life of a radioactive isotope?
half of the time taken for all of the original nuclei to decay
the time taken for half of the original nuclei to decay
the time taken for the charges on all the nuclei to halve
the time taken for the mass of each nucleus to halve
A positively-charged rod is held near to, but not touching, an uncharged metal sphere.
The sphere is briefly now connected to earth.
The rod is removed.
Which statement about the charge on the sphere is correct?
It is charged negatively because negative charges have moved from earth to the sphere.
It is charged negatively because positive charges have moved from the sphere to earth.
It is charged positively because negative charges have moved from the sphere to earth
It is charged positively because positive charges have moved to earth from the sphere.
The power of the motor is 40 W and the system is 20% efficient.
How long does it take the motor to lift the load through 0.50 m?
0.50 s
2.50 s
5.0 s
25 s
The electromotive force (e.m.f.) of a rechargeable battery is 6.0 V.
What does this mean?
6.0 J is the maximum energy the battery can provide in 1.0 s.
6.0 J is the total energy the battery can provide before it has to be recharged.
6.0 J of energy is provided by the battery to drive a charge of 1.0 C around a complete circuit.
6.0 J of energy is provided by the battery to drive a current of 1.0 A around a complete circuit.
Which arrow on the graph shows the amplitude of the wave?
A
B
C
D
The diagram shows the path of a stone that is thrown from X and reaches its maximum height at Y.
The stone gains 10 J of gravitational potential energy as it moves from X to Y.
The stone has 2.0 J of kinetic energy at Y.
Air resistance can be ignored.
How much kinetic energy did the stone have immediately after it was thrown at X?
2.0 J
8.0 J
10 J
12 J
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