Cambridge IGCSE Physics - 0625 - Supplement Paper 2 2019 Summer Zone 3

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

A brass ball and a feather are released at the same time.
On Earth, the ball reaches the ground first.
On the Moon, they reach the ground at the same time.
What is the explanation for this?

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?

On Earth, a spring stretches by 5.0 cm when a mass of 3.0 kg is suspended from one end.
The gravitational field strength on the Moon is $\frac{1}{6}$ of that on Earth.
Which mass, on the Moon, would stretch the spring by the same extension?

X, Y and Z are three regularly shaped solid objects. Their dimensions and masses are shown in the diagrams. Which objects have the same density?

An experiment is carried out to determine the spring constant for a spring that obeys Hooke’s law.
A load is hung from the spring and the extension of the spring is measured.
Which calculation is used to calculate the spring constant?

A car is driven from rest on a long straight road. The car engine exerts a constant driving force.
The diagram shows the horizontal forces acting on the car. The resistive forces are proportional to the speed of the car.

Why does the car eventually reach a maximum speed?

A beam of weight 6.0 N is suspended from two strings P and Q. String P is 30 cm from the left-hand end of the beam, as shown. String Q is not shown. The tension in string P is 2.0 N.
What is the tension in string Q and where is it attached so that the beam is in equilibrium?

How is momentum $p$ calculated in terms of the mass $m$ of a body and its velocity $v$, and what type of quantity is $p$? [Table_1]

An object is in free fall. The change in gravitational potential energy of the body depends upon its mass $m$, the change in height $\Delta h$ and the gravitational field strength $g$.
What is the correct expression for the change in gravitational potential energy?

A machine is very efficient. What does this mean?

A box is pulled along a floor by a force of 3.0 N.

The friction acting on the box is 1.0 N, as shown.



How much kinetic energy does the box gain in moving 2.0 m?

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?

Water in a beaker evaporates when it is left on a bench for a period of time. Increasing the surface area and increasing the temperature of the water each change the rate of evaporation. Which row is correct?
[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?

100g of water at 25°C is poured into an insulating cup. 50g 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.
18g 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?

Why does a metal rod conduct thermal energy much better than a similar-sized plastic rod?

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?

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?

Sound travels through air at a speed of 340 m/s. A source generates sound waves at a frequency of 1.2 kHz. What is the wavelength of the sound waves?

Which conditions are necessary for light to be totally internally reflected? [Table_1]

A beam of light passes through a vacuum and then enters a liquid. The diagram shows the path it takes.
The light travels through the vacuum at a speed of $3.0 \times 10^8 \text{ m/s}$.
What is the speed of light in the liquid?

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?

Which statement about ultrasound is correct?

A metal bar is placed inside a current-carrying coil, as shown in diagram 1.
There is a small current in the coil. The bar holds a few nails, as shown in diagram 2.
When there is no current in the coil, the nails drop off.
Which row is correct?
[Table_1]

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 1.5V.
What does this statement mean?

Two wires X and Y are made from the same metal and have the same resistance.
Which row identifies a possible pair of values for X and for Y?
[Table_1]

The diagram shows a circuit including a lamp, an electric bell and three switches $S_1$, $S_2$ and $S_3$.
The lamp and bell are not faulty.



The bell is ringing but the lamp is not lit.
Which switches are closed?

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

A 12 V battery is connected to a combination of 2.0 Ω resistors as shown.

What is the current in the battery?

A student is designing a lighting circuit for a dolls’ house. He sets up two different circuits.
Each circuit contains a 12 V power supply and three identical lamps.
Each lamp is designed to operate at normal brightness when connected individually to a 12 V supply.



Which statement is correct?

The combination of logic gates shown has two inputs and one output.
Which single logic gate is equivalent to this combination?

A simple wiring diagram for an electric cooker is shown.

Why is there a wire connecting the metal case of the cooker to earth?

α-particles are directed at a metal foil.
Most of the particles pass through the foil with little change in direction.
A small proportion of the particles are scattered back through large angles.
What does this evidence suggest about the structure of an atom?

A conductor carrying a current is placed in a magnetic field. In which direction does the force on the conductor act?

What is nuclear fission?

Which statement about $\gamma$-radiation is correct?

A radium nucleus with nucleon number 226 decays by emitting an $\alpha$-particle.
The proton number of radium is 88.
What are the nucleon number and proton number for the nucleus produced by this decay?
[Table_1]