Cambridge IGCSE Physics - 0625 - Core Paper 1 2020 Winter Zone 1

The diagram shows a pendulum. The pendulum bob swings repeatedly between points M and N.
A student starts a stop-watch when the bob reaches point M.
He counts each time the bob changes direction and stops the watch on the tenth change in direction.
The watch shows a time of 12.0 seconds.
What is the period of the pendulum?

The speed–time graph represents a journey.

How does the graph show that the distance travelled in section X of the journey is greater than the distance travelled in section Y?

A boy throws a ball vertically upwards with a speed v.

Which row describes the speed and the acceleration of the ball at point X on the way upwards?

A student compares the weights of different objects. Which apparatus does he use?

Which quantity is weight an example of?

A metal ball is attached to a cork and is lowered into a measuring cylinder, pulling the cork into the water, as shown. The mass of the cork is 4.8 g. What is the density of the cork?

A uniform plank rests on a pivot at its center.
Two children P and Q sit on the plank in the positions shown.

The mass of child P is 25 kg.
The plank is balanced.
What is the mass of child Q?

An object is in equilibrium on the Earth.
Which statement is correct?

A man jumps from a stationary balloon. After falling several hundred metres, he opens his parachute. At which position is his kinetic energy greatest?

The arrows show an outline of the processes in an oil-fired power station.
oil is burnt → turns turbine → turns generator → output transformer
What are the processes for the transfer of energy between the turbine and the generator and between the generator and the output transformer? [Table_1]

To calculate the power produced by a force, the size of the force must be known. What else needs to be known to calculate the power?
[Table_1]

A rectangular marble block has dimensions 1 m by 1 m by 5 m and weighs 125 000 N.
The marble block is stored with the long side resting on the ground, as in diagram 1.

What is the change in the pressure on the ground due to the block when the block is stored as in diagram 2 rather than diagram 1?

The diagram shows a mercury barometer. Which height is used as a measurement of atmospheric pressure?

On a warm day, a driver checks the air pressure in a car tyre. At night, the temperature drops and the air pressure in the tyre decreases. There are no air leaks in the tyre.
Why does the pressure decrease?

The diagram shows the more energetic water molecules escaping from the surface of liquid water.
What is this process called?

When a bridge is built, a gap is left between each concrete slab. Why are these gaps left?

The table shows the melting and boiling points of four different substances.
Which substance becomes a liquid when placed in a beaker of boiling water?
[Table_1]

The diagram shows four rods. Each rod is made of a different metal.

Wax is used to attach small metal balls at the rod ends P, Q, R and S.
Each rod is the same size. They are heated uniformly by a Bunsen burner at point X.
As the rods warm up, the wax melts and the balls fall off.
Why does the ball on the silver rod fall first?

The diagram shows a pan of water being heated.
After a short time, all the water in the pan begins to boil.

What is the main process by which thermal energy is transferred through the water?

Which row correctly describes light waves?
[Table_1]

The diagram shows two pieces of wood resting in shallow water of constant depth. Straight, parallel wavefronts approach the pieces of wood as indicated.

The gap between the pieces of wood is 2.0 cm wide.
The wavefronts are 3.0 cm apart.
What is the appearance of the wavefronts after they pass through the gap?

A man sees a stone at the bottom of a pool of water.
Which path could be taken by light from the stone to the man?

Which statement about a thin converging lens is correct?

The diagram shows a beam of white light passing through a triangular prism. A spectrum is produced.
Which row correctly shows a wave property involved in producing the colours at X and Y?
[Table_1]

The diagram shows the electromagnetic spectrum.
Which types of wave are E, F and G? [Table_1]

A police car with its siren sounding is stationary in heavy traffic. A pedestrian notices that, although the loudness of the sound produced does not change, the pitch varies.
Which row describes the amplitude and the frequency of the sound?

Two soft-iron pins are suspended from the S pole of a bar magnet.
Which diagram shows how the pins are deflected?

A student uses three small plotting compasses to investigate the magnetic field around a bar magnet.
Which diagram shows the directions in which the compass needles point?

What is an electric current in a metal wire?

Four wires are made of the same metal. Which wire has the greatest resistance?

A student uses four ammeters P, Q, R and S to measure the current in different parts of the circuit shown.

Which two ammeters read the largest current?

A circuit X is set up with two identical lamps. Circuit Y is then set up, changing the positions of the meters.

On which meters do the readings change?

An electrical appliance is powered from a mains supply.
The appliance normally uses a current of 3 A, but the current briefly rises to 4 A at the instant the appliance is switched on. The cable to the appliance is designed for currents up to 6 A.
A fuse is used to protect the circuit.
What should be the rating of the fuse?

An electromagnet is positioned close to a coil of wire.
The electromagnet is switched on, remains on for a short time, and is then switched off.
Three statements about the pointer on the galvanometer during this sequence are given.
1 The pointer kicks to one side as the electromagnet is switched on.
2 The pointer records a steady non-zero value while the electromagnet remains switched on.
3 The pointer kicks to the other side as the electromagnet is switched off.
Which statements are correct?

A transformer is needed to convert a supply of 240 V a.c. into 4800 V a.c.
$$N_P \quad N_S$$
240 V a.c.        4800 V a.c.

Which pair of coils would be suitable for this transformer?
[Table_1]

The diagrams show a current-carrying wire with an arrow in the direction of the current. Which diagram shows the magnetic field produced by the current?

Which statement is correct for the nucleus of any atom?

The nucleus of an atom X is represented by the notation shown.

How many protons and how many neutrons are in this nucleus?

A radiation detector records a low reading even when no radioactive source is close. This is due to background radiation. What does not contribute to this background radiation?

The graph shows the radioactive decay curve of a substance.
What is the half-life of this substance?