Cambridge IGCSE Physics - 0625 - Supplement Paper 2 2019 Summer Zone 1

Which quantity can be measured directly using a micrometer screw gauge?

The velocity of an object increases from 30 m/s to 50 m/s in 5.0 seconds.
What is the average acceleration of the object?

A heavy metal ball falls vertically downwards through air past four equally spaced levels J, K, L and M.

The times taken to fall from one level to the next are measured.
Where is the speed of the ball greatest and which time is shortest?

A body is moved from place X to place Y where the gravitational field strength is different. What happens to its mass and to its weight due to the move? [Table_1]

The diagrams show four solid blocks with their dimensions and masses.
Which block has the greatest density?

A student wishes to determine the spring constant of a spring where it obeys Hooke’s law. Different loads are hung from the spring and its length is measured for each different load. The table shows the results of the experiment.
[Table_1]
What is the value of the spring constant of the spring?

A mass of 20 kg is held stationary by a rope passing over a frictionless pulley.
What is the tension $T$ in the rope?

A boat starts moving across a river at velocity $v$ perpendicular to the river bank. The boat encounters a current along the river of velocity $u$, as shown.

Which vector diagram shows the resultant velocity $r$ of the boat?

A ball of mass 0.50 kg falls and hits the floor at 10 m/s. It rebounds at speed 8.0 m/s, as shown.

The collision between the ball and the floor lasts for 0.50 s.
What is the average force acting on the ball during the collision?

An object falls from the top of a building that is 25 m high. Air resistance is negligible.
What is the speed of the object when it hits the ground?

A machine is very efficient. What does this mean?

A crane takes 2.0 minutes to lift a load to the top of a building. The change in gravitational potential energy of the load is 360 kJ.
What is the useful power output of the crane?

The diagram shows a stone suspended on a string under the surface of a liquid. The stone experiences a pressure caused by the liquid.
What would increase the pressure on the stone?

A stationary smoke particle is hit by a fast-moving nitrogen molecule.
Which row describes the motion of the smoke particle and of the nitrogen molecule after the collision?
[Table_1]

A night storage heater contains a large block of material that is heated electrically during the night. During the day the block cools down, releasing thermal energy into the room.
Which thermal capacity and which night-time temperature increase will cause the most energy to be stored by the block?

[Table_1]

100 g of water at 25°C is poured into an insulating cup. 50 g of ice at 0°C is added to the water. The water is stirred until the temperature of the water has fallen to 0°C.
18 g of ice remains unmelted.
The specific heat capacity of water is 4.2 J/g°C.
Which value does this experiment give for the specific latent heat of fusion of ice?

In which does thermal conduction not occur?

The metal surface of a kettle is hot.
What happens to the cool air outside the kettle when it comes into contact with the hot kettle?

Some hot water is sealed inside a metal can. The can is in a vacuum in outer space. The hot water slowly cools down.
How does the thermal energy escape into space?

When water waves pass through a gap they diffract.
The diagrams show wavefronts approaching a narrow gap.
In which diagram will the diffraction be least?

An object is placed 30 cm in front of a plane mirror.
Which statement describes the image of the object?

A small object O is placed near a converging lens, as shown. The lens forms an image I.
Which statement is correct?

An eclipse of the Sun happens when the Moon comes between the Earth and the Sun. Which statement is correct?

A pulse of sound is produced at the bottom of a boat. The sound travels through the water and is reflected from a shoal of fish. The sound reaches the boat again after 1.2 s. The speed of sound in the water is 1500 m/s.

How far below the bottom of the boat is the shoal of fish?

What is the approximate value of the speed of sound in air at normal temperature?

Why is soft iron used for the core of an electromagnet?

Diagram 1 shows two thin, uncharged strips of plastic.
Diagram 2 shows the same strips after they have been rubbed with a dry cloth.



Which row describes the charge on the strips after rubbing, and the force between the strips after rubbing?

A cell has an electromotive force (e.m.f.) of 1.5 V.
What does this statement mean?

Which two changes to a metal wire both increase resistance?

The diagram shows a circuit containing a d.c. power supply, a motor and a variable resistor. Three ammeters X, Y and Z show the current in different parts of the circuit.

The reading on X is 4.0A.

Which statement is correct?

A lamp is to be connected in a circuit so that the potential difference (p.d.) across it can be varied from 0 to 6V. Which circuit would be most suitable?

Which logic gate is represented by the symbol shown?

The diagram shows a combination of logic gates.
Which single logic gate is equivalent to this combination?

An alternating current (a.c.) power supply is connected in series with a resistor R and a diode.

Which graph shows how the voltage V across the resistor R varies with time?

An electric heater is plugged into the mains supply using a fused plug.
The current in the heater is 10A.
The cable attached to the heater is rated at 15A.
The fuses available are rated at 1 A, 3 A, 5 A and 13 A.
Which fuse should be used?

What is the purpose of the commutator in a d.c. electric motor?

The diagram shows a wire between two magnetic poles. The wire is connected in a circuit with an ammeter.

The wire is moved downwards, towards the bottom of the page. A current is induced in the wire.
In which direction is the force on the wire caused by this current?

The chemical symbol for sodium is Na. The equation represents the radioactive decay of sodium-24. $$^{24}_{11}\text{Na} \rightarrow ^{24}_{x}\text{Mg} + ^{y}_{-1}\text{e}$$ What are the numbers x and y? [Table_1]

A radioactive source emits $\alpha$-particles, $\beta$-particles and $\gamma$-rays into a vacuum where there is a magnetic field. The magnetic field acts perpendicularly into the plane of the paper. The paths X, Y and Z of the three types of radiation through the magnetic field are shown.

Which radiation follows path X, path Y and path Z?

A student measures the level of radiation emitted from a radioactive substance. He places a detector very close to the substance. He puts different absorbers between the radioactive substance and the detector.

The student’s results are shown. These results are corrected for background radiation.
[Table_1]
Which types of radiation are being emitted by the substance?