Cambridge IGCSE Physics - 0625 - Supplement Paper 2 2017 Winter Zone 3

A measuring cylinder contains some water. A small metal block is slowly lowered into the water and is then removed.
Finally a piece of plastic is attached to the metal block and the block is again slowly lowered into the water.
The diagrams show the measuring cylinder at each stage of this process.

What is the volume of the piece of plastic?

Four balls with different masses are dropped simultaneously from the heights shown. Air resistance may be ignored. Which ball hits the floor first? [Image_1: Diagram showing four balls with different masses and heights]

The diagram shows the vertical forces acting on a ball as it falls vertically through the air. The ball does not reach terminal velocity.
Which row describes what happens to the resultant force on the ball and what happens to the acceleration of the ball as it falls through the air?

A spring is stretched by hanging a piece of metal from it.



Which name is given to the force that stretches the spring?

On the Moon, all objects fall with the same acceleration. Which statement explains this?

A pair of cutters is used to cut a rope. Where should the rope be positioned and at which labelled points should the hands be positioned to produce the greatest cutting force?

The lamp in the diagram is not very stable and falls over easily.

Which row shows changes that would definitely make the lamp more stable?

The diagram shows an incomplete scale drawing to find the resultant of two 10N forces acting at a point in the directions shown.
What is the magnitude of the resultant force?

An object has a mass of 60 kg.
It decelerates from 50 m/s to 20 m/s when a resultant force of 300 N acts on it.
For how long does the force act?

A car, starting from rest at position X, accelerates up a hill. The car reaches a speed of 10 m/s at position Y.
The kinetic energy of the car at position Y is equal to its gain in gravitational potential energy from X to Y.



Take the gravitational field strength $g$ to be $10 \text{N/kg}$.
What is the gain in height of the car between X and Y?

A 150W filament lamp has an efficiency of 10%. A 40W compact fluorescent lamp (CFL) has an efficiency of 30%.
Each lamp is switched on for the same amount of time.
Which lamp produces more light and which lamp converts more energy into other forms of energy?
[Table_1]

A student runs up a flight of stairs.

Which information is not needed to calculate the rate at which the student is doing work against gravity?

The diagram shows a simple mercury barometer.
Which length is used to find the value of atmospheric pressure?

A pollen grain in a beaker of still water is viewed through a microscope. Which diagram shows the most likely movement of the pollen grain?

The diagram shows an air-filled rubber toy. A child sits on the toy and its volume decreases.

The temperature of the air in the toy does not change.



How does the air pressure in the toy change and why?

[Table_1]

The diagram shows a glass flask, sealed with a small volume of mercury in a glass tube. When the flask is gently warmed the mercury rises up the tube.

What is the main cause of the movement of the mercury?

Which property cannot be used for the measurement of temperature?

A student uses an immersion heater to heat some water in a beaker.
The water is heated from 20\(^\circ\text{C}\) to 80\(^\circ\text{C}\).
The energy supplied to the water is 60.0 kJ.
What is the thermal capacity of the water? (Ignore any heat loss.)

Why is the heating coil of a domestic immersion heater placed at the bottom of the tank?

The diagram represents plane wavefronts of a water wave about to strike a solid barrier.
Which diagram shows the position of the wavefronts after reflection at the barrier?

The diagram shows a ray of light in glass. The ray reaches a boundary with air.
One weak ray of light is missing from the diagram.

Which statement is correct?

Light travelling in air enters a plastic block at an angle of incidence of 62°. The plastic has a refractive index of 1.48.

What is the angle of refraction?

A sound wave travels from a medium in one state into the same medium but in another state. This causes the speed of the wave to change from approximately 300 m/s to approximately 3000 m/s.
Between which two states is the sound wave travelling?

The Moon is 380000 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?

Which statement about radio waves is correct?

The diagram shows the Earth and its surroundings. Through which labelled region can sound not be transmitted?

Different waves travel through air.
Which waves have the greatest difference in speed?

A train of steel nails and a train of iron nails hang from a strong magnet. The trains are then carefully removed from the magnet. What happens to the trains?

What is the best method to demagnetise a steel rod?

There is a current in a metal wire.
Which particles in the wire move to cause this current?

The diagram shows a circuit with a gap between points P and Q. Four pieces of metal wire of the same material are connected, in turn, between points P and Q in the circuit.

The table gives the diameters and lengths of the wires.
In which wire is the current the largest?
[Table_1]

A battery is connected to a circuit. It is switched on for 1.0 minute. During that time, there is a current of 0.40 A in the circuit and the battery supplies a total of 48 J of energy.
Which row gives the charge that passes and the electromotive force (e.m.f.) of the battery?
[Table_1]

Identical cells and identical resistors are used to make the circuits shown.

In circuit 1, the ammeter reads 2.0A.
What is the ammeter reading in circuit 2?

The diagram shows a circuit with a fixed resistor connected in series with a thermistor and an ammeter.
Which row shows how temperature change affects the resistance of the thermistor and the current in the circuit? [Table_1]

The diagram shows an AND gate and an OR gate connected together.
Which combination of inputs X, Y and Z gives an output of 0?
[Table_1]

The diagram shows a short-circuited copper coil swinging about an axis at right-angles to a strong magnetic field. The motion induces a current in the coil.

What is the effect, if any, of this induced current in the coil?

Diagram 1 shows a magnet being pushed into a coil that is connected to a centre-zero galvanometer.

Which row shows the directions of the pointer when the magnet is as shown in diagrams 2 and 3?

Radioactive carbon-14 decays to nitrogen-14 by the emission of a particle.
$$\frac{14}{6} \text{C} \rightarrow \frac{14}{7} \text{N} + \text{particle}$$
Which particle has been emitted in this process?

As $\alpha$-particles pass through the electric field between two charged plates, they are deflected downwards.
What happens to $\gamma$-rays passing through the same electric field?

Radioactive iodine-131 emits \( \beta \)-particles and has a half-life of 8 days. It decays to produce xenon-131.
Which statement about this decay is correct?