Cambridge IGCSE Physics - 0625 - Core Paper 1 2017 Summer Zone 2

Which device is used to measure the time it takes for a 10cm$^3$ block of ice to melt in a laboratory at room temperature?

A student determines the average speed of a bubble rising through a liquid at constant speed. When the student starts the stopwatch the bubble is at position P. After 2.0 s the bubble is at position Q.
What is the speed of the bubble between P and Q?

The speed-time graph represents a motorcycle journey.
In which part of the graph is the acceleration equal to zero?

Which expression is used to find gravitational field strength $g$?

A block of ice is removed from a freezer. Some of the ice melts to produce water. Some of the water that is produced evaporates.
The original mass of the ice is $p$. The mass of the ice that has not yet melted is $q$. The mass of the water is $r$. The mass of the water vapour is $s$.
The diagram shows these changes.

Which equation gives the relationship between $p$, $q$, $r$ and $s$?

The masses of a measuring cylinder before and after pouring some liquid into it are shown in the diagram.
What is the density of the liquid?

A car travels forwards along a straight horizontal road. Only the horizontal forces acting on it are shown.

The length of each arrow represents the size of each force. How do these forces affect the motion of the car?

The centre of a uniform metre rule rests on a pivot. A load of weight 3.0 N is placed at the 70 cm mark.
A force $F$ acts upwards at the 80 cm mark. The rule is in equilibrium.



What is the magnitude of $F$?

An energy resource is used to generate electrical energy.
Which energy resource uses a transfer of gravitational potential energy to generate this electrical energy?

The diagrams show athletes training by stretching springs. Each spring has the same stiffness. Which athlete does the most work?

The diagram shows a conical vessel full of water.
The pressure at point X due to the water is $p$. A point Q is a distance $h$ above point X.

[Image_1: Diagram showing a conical vessel]

Which graph shows how the pressure due to the water at Q varies with distance $h$?

In diagram 1 a manometer containing mercury (Hg) is connected to a gas tap. The tap is turned off and the mercury is at the same level on both sides.
When the gas supply is turned on, the mercury in the tube connected to the supply falls by 40 mm and the mercury in the tube open to the atmosphere rises by 40 mm, as shown in diagram 2.
What is the pressure of the gas in the gas supply?

Brownian motion is observed when using a microscope to look at smoke particles in air.
What causes the smoke particles to move at random?

Which change is evaporation?

A glass bottle has a metal cap. The cap fits very tightly and is difficult to remove.
The cap and the neck of the bottle are dipped in a bowl of hot water. The cap can be removed more easily.
What happens to allow the cap to be removed more easily from the bottle?

Equal masses of two different liquids are put into identical beakers.
Liquid 1 is heated for 100s and liquid 2 is heated for 200s by heaters of the same power. Each liquid has the same rise in temperature.

Which statement is correct?

A copper bar and a wooden bar are joined. A piece of paper is wrapped tightly around the join. The bar is heated strongly at the centre for a short time, and the paper goes brown on one side only. Which side goes brown, and what does this show about wood and copper?

A glass of water is taken out of a refrigerator. Several ice cubes are put into the glass of water. The glass is then left in the room for several hours.
The graph shows how the temperature of the water in the glass varies from the time it is taken out of the refrigerator.
[Image_1: Graph showing temperature over time]
What does the temperature marked X represent?

A hollow aluminium cube is filled with very hot water.
Side X of the cube is opposite side Y of the cube. One of these two sides is black and one is white.
A student holds the back of one hand 5 cm from side X, and then immediately holds the back of the other hand 5 cm from side Y.

The hand held near side Y feels warmer than the hand held near side X.
Which row identifies the black side and correctly compares the rate of emission of thermal radiation from each side?
[Table_1]

What causes the change in direction when light travels from air into glass?

Light passes into a glass block. Which is the angle of refraction?

Which diagram shows what happens when a ray of white light passes through a prism?

The diagrams show four sources of waves.
Which source produces longitudinal waves?

The table shows different types of wave in the electromagnetic spectrum.
[Table_1]
Where do all the waves travel at the same speed?

A fire alarm is not loud enough and the pitch is too low. An engineer adjusts the alarm so that it produces a louder note of a higher pitch.
What effect does this have on the amplitude and on the frequency of the sound?

What is wrong with this labelled diagram of a permanent magnet?

Which statement about magnetism is correct?

A student tests the electrical conduction of four materials.
aluminium
iron
plastic
silver
Which materials conduct electricity?

The circuit diagram shows three resistors connected in series across a 6.0V supply.
What is the potential difference (p.d.) across the 4.0Ω resistor?

A thermistor is connected in series with a sensitive ammeter and a battery.

Which change will give a larger ammeter reading?

Three ammeters measure the currents in different parts of the circuit shown. The diagram indicates the reading on the ammeters.

How do we know that at least one of the ammeters must be faulty?

A student connects a variable potential divider (potentiometer) circuit.
What happens to the reading on the voltmeter as the sliding terminal T is moved from R to S?

The diagram shows an electric circuit.
What is the potential difference (p.d.) across the LDR?

A circuit-breaker is designed to protect a circuit which usually carries a current of 2 A.
The time taken to break the circuit depends on the current, as shown in the graph.

What happens when the current in the circuit is 2 A and what happens when the current is 18 A?

What is the purpose of a relay?

A coil of four loops of wire is placed in a magnetic field. When there is a current, the coil experiences a turning effect. Some extra loops of wire are wound on the coil but the current is unchanged. How does this affect the turning effect?

Which particle has a negative charge?

The diagram represents the nucleus of an atom. The charged particles are shown.
Which row gives the proton number and the nucleon number for this nucleus?
[Table_1]

A sample of radioactive isotope is decaying. The nuclei of which atoms will decay first?

The half-life of a radioactive isotope is 4.0 years.
A sample of this material contains 24 million radioactive nuclei.
How many of these radioactive nuclei remain undecayed after 12 years?