Cambridge IGCSE Physics - 0625 - Supplement Paper 2 2020 Summer Zone 1

A pendulum makes 50 complete swings in 2 min 40 s. What is the time period for 1 complete swing?

A student investigates the motion of a ball rolling down a slope.
The diagram shows the speed $v$ of the ball at different times $t$.

Which statement describes the motion of the ball?

Which statement about acceleration is correct?

Which statement correctly describes the effects of placing a heavy load in a car?

A mass of 6.0 kg rests on the surface of a planet.
On this planet, $g = 20 \text{ N/kg}$.
What is the weight of the object?

The mass of a measuring cylinder is 190 g.
400 cm³ of liquid is put into the measuring cylinder.
The total mass of the measuring cylinder and the liquid is 560 g.
Four solid objects are lowered in turn into the liquid. The densities of the objects are shown.

1. 0.40 g/cm³
2. 0.90 g/cm³
3. 1.2 g/cm³
4. 2.7 g/cm³

Which objects will float in the liquid?

The diagram shows a wooden beam PQ, of negligible weight, which is attached to a wall by a hinge at P and kept in a horizontal position by a vertical rope attached at Q. The beam is 3.0 m in length. A man of weight 800 N walks along the beam from P to Q. [Image] What is the distance of the man from P when the tension in the rope at Q becomes equal to 500 N?

Which quantity is a vector?

An object of mass 1.2 kg is moving with a velocity of 2.0 m/s when it is acted on by a force of 4.0 N. The velocity of the object increases to 5.0 m/s.
For what period of time does the force act on the object?

The diagram shows part of a rollercoaster ride with the car at different positions. The car runs freely down from position X to position Y and up the hill on the other side. What happens to the kinetic energy and to the gravitational potential energy of the car as it moves from position X to position Y? [Table_1]

Which energy resource does not have the Sun as the original source?

The diagram shows a solid block resting on a bench. The dimensions of the block are shown.
On which labelled surface should the block rest to produce the smallest pressure on the bench?

The pressure due to the liquid on an object immersed in that liquid is 4500 Pa.
The density of the liquid is 900 kg/m\(^3\).
What is the depth of the object below the surface of the liquid?

A gas is heated in a sealed container.
The volume of the container does not change.
What happens to the molecules of the gas?

Water in a beaker evaporates when left on a bench for a period of time.
Which three factors all affect the rate of evaporation of the water?

A solid is heated causing it to expand.
What effect does this have on its mass and on its density?
[Table_1]

The diagrams show four blocks of steel. The blocks are all drawn to the same scale. The same quantity of thermal energy is given to each block. Which block shows the greatest rise in temperature?

Why are metals better thermal conductors than other solids?

Two freezers X and Y are identical except that one has a door opening at the front and the other has a door opening at the top.



Both doors are the same size and are opened for the same amount of time.

Which freezer gains the least amount of thermal energy in this time and why?

A wave of frequency 6600 Hz travels 1320 m in 4.0 s.
What is the wavelength?

The diagram shows a wave.
What are the amplitude and the wavelength of this wave?

Which statement is correct?

A narrow beam of white light passes through a prism and is dispersed into a spectrum. Which row is correct? [Table_1]

An intruder alarm sensor detects that a person is warmer than his surroundings.
Which type of electromagnetic wave does the sensor detect?

Sound travels through air as a series of compressions and rarefactions. Which statement correctly compares a compression with a rarefaction?

Four nails A, B, C and D are tested to find which makes the strongest permanent magnet. One of the nails is placed against a bar magnet and the number of paper clips which the nail can support is recorded.
The bar magnet is then removed and the number of paper clips remaining attached to the nail is recorded. Each nail is tested individually.
Which nail becomes the strongest permanent magnet?
[Table_1]

The circuit shows one method of magnetising a steel bar.
How can the circuit be altered so that it can be used to demagnetise the magnetised steel bar?

A student uses the circuit shown to determine the resistance of two identical resistors.

The voltmeter reading is 2.2 V and the ammeter reading is 0.25 A.
What is the resistance of each resistor?

An electric fire is connected to a 240V supply and transfers energy at a rate of 1.0 kW.
How much charge passes through the fire in 1.0 h?

The diagram shows an incomplete circuit. The temperature and light levels around the circuit remain unchanged.
Four electrical components are connected in turn across PQ. The cell is reversed and the four electrical components are connected again in turn across PQ.
For which component is there a significant change in the magnitude of the current?

In the circuit shown, $A_1$ and $A_2$ are ammeters.

Switch S is closed.
Which row is correct?

Which symbol represents an OR gate?

A digital circuit consists of two logic gates. When the input to the circuit is 1 and 1, the output is 0.



Which combination of logic gates gives this result?

The diagram shows a wire between the poles of a magnet. The wire is perpendicular to the page.
The wire is moved and a current is induced upwards, out of the paper.
In which direction is the wire moved?

A 100\% efficient transformer converts a 240V input voltage to a 12V output voltage. The output power of the transformer can be a maximum of 20W.
The output is connected to two 0.30A bulbs in parallel. One of the bulbs fails.
How does the current in the primary coil change?

Cables transmit electrical power from the output of the transformer at a power station to the input of the transformer at a substation.
The power at the output of the transformer at the power station is 400 MW.

Which situation delivers the most power to the input of the transformer at the substation?
[Table_1]

Uranium-235 is a radioactive isotope. It undergoes a chain of decays and eventually forms the stable isotope lead-207. These two isotopes are represented as shown.

$${}^{235}_{92}\text{U} \quad {}^{207}_{82}\text{Pb}$$

During this chain of decay, how many protons and how many neutrons are lost from a single nucleus of uranium-235 to form a single nucleus of lead-207?

[Table_1]

A radioactive material has a half-life of 20 days. A sample of the material contains $8.0 \times 10^{10}$ atoms. How many atomic nuclei have decayed after 60 days?

A thin sheet of paper is placed between a radioactive source and a radiation detector. The count rate falls to a very low reading.
From this result, which type of radiation is the source emitting?

α-particles, β-particles and γ-rays are emitted by radioactive nuclei when they decay.
Which emissions can be deflected by an electric field?