Cambridge IGCSE Physics - 0625 - Supplement Paper 2 2019 Winter Zone 2

A student measures the dimensions of a cylindrical glass beaker.
For which measurement should she use a micrometer screw gauge?

The graph shows how the speed of a car varies during part of a journey.

What is the acceleration of the car between 6.0 s and 10.0 s?

A car travels at an average speed of 60 km/h for 15 minutes.
How far does the car travel in 15 minutes?

A box is placed on the ground. An upward force of 15N is needed to lift the box at constant speed.
Which row correctly describes the box?
[Table_1]

The table gives the mass and the volume of three objects P, Q and R.

[Table_1]

The table:
| object | mass/g | volume/cm³ |
|--------|--------|-----------|
| P | 23 | 36 |
| Q | 170 | 720 |
| R | 240 | 340 |

Which objects can float in a liquid of density $0.85\, \text{g/cm}^3$?

A hook is used to lift a metal plate, as shown.

An upward force of 100 N is needed to lift the metal plate about the pivot, as shown. What is the weight $W$ of the metal plate?

What is the unit of the moment of a force?

A ship travels due North through still water at a speed of 20 m/s.
It enters a channel where there is a current in the water from West to East. The speed of the current is 20 m/s.
Which diagram shows the resultant velocity $v$ of the ship?

A ball is at rest on the ground. A boy kicks the ball. The boy's boot is in contact with the ball for 0.040 s.
The average force on the ball is 200 N. The ball leaves the boy's boot with a speed of 20 m/s.
Which row gives the impulse of the boot on the ball and the average acceleration of the ball?
[Table]

An object P of mass 80 g collides with another object Q of mass 40 g.
After the collision, P and Q stick together and then travel on together.
Before the collision, P is travelling at a speed of 6.0 m/s and Q is at rest.
What is the speed of P and Q after the collision?

Brakes are used to slow down a moving car.
Into which form of energy is most of the kinetic energy converted as the car slows down?

A box of mass 8.0 kg is lifted from the ground and placed on a shelf. The box gains 100 J of potential energy.
The box falls off the shelf. Air resistance can be ignored.
At what speed does the box hit the ground?

A car is moving along a straight horizontal road. The car has 1.6MJ of kinetic energy. The car accelerates for 20s until the kinetic energy of the car increases to 2.5MJ.
What is the minimum average power developed by the car engine for this acceleration?

A drawing pin (thumb tack) has a sharp point at one end and a flat surface at the other end.

[Image: A drawing pin with a sharp point labeled 'sharp point' and a flat surface labeled 'flat surface'.]

The pin is pushed into a wooden board.

How do the pressure and the force at the sharp point compare with the pressure and the force on the flat surface?

The density of mercury is 13600 kg/m^3.
What is the pressure at the bottom of a column of mercury that has a height of 75.0 cm?

Which row describes the arrangement and the motion of the molecules in a gas?
[Table_1]

A bubble of air of volume 3.0 mm^3 is under water. The bubble is at a depth where the pressure of the air inside the bubble is four times atmospheric pressure. The temperature of the air in the bubble stays the same as it rises to the surface. What is the volume of the air in the bubble as it reaches the surface?

The same quantity of thermal energy is supplied to each of four blocks. Each block is made from a different material. Which block has the greatest thermal capacity?

A liquid turns into a gas. This occurs only at one particular temperature, and the change happens throughout the liquid. What is this process called?

In a cold country, a bicycle has been left outside all night. The cyclist finds the plastic hand grips feel less cold to the touch than the steel handlebars.
Which row correctly describes the temperature and the property of the two materials?
[Table_1]

The diagram shows a tent made from a new material.
What type of material should the tent be made of to reflect the radiant energy from the Sun?
[Table_1]

A large hill blocks the direct path between a transmitter of radio waves and a receiver, as shown. The receiver picks up the signal from the transmitter even though the radio waves do not travel through the hill.
Which row is correct?

A ray of light is incident on a plane mirror. A student measures the angle of incidence $i$ and the angle of reflection $r$.

The student varies the angle of incidence and then plots a graph of $r$ against $i$.
What does the graph look like?

What is monochromatic light?

The diagram shows the electromagnetic spectrum.
[Image_1: \text{Diagram of electromagnetic spectrum with } \gamma\text{-rays, X-rays, ultraviolet, visible light, infrared, microwaves, radio waves}]

A word is missing from the label below the spectrum.
Which word is missing?

Which row gives a possible set of values for the speed of sound in ice, in water and in steam?
[Table_1]

A steel bar is placed in an East-West direction for it to be demagnetised. No other magnet is nearby. Which method is not suitable?

A plastic rod is rubbed with a dry cloth. The rod becomes positively charged. Why has the rod become positively charged?

There is a current of 2.0 A in a resistor for 30 s. The potential difference (p.d.) across the resistor is 12 V.
How much energy is transferred in the resistor?

Identical resistors are connected together to form arrangements X, Y and Z.
What is the correct order of the resistances of the arrangements from the largest to the smallest?

Resistors of 1.0\,\Omega, 2.0\,\Omega \text{ and } 3.0\,\Omega \text{ are connected in parallel with a cell.}
Which statement is correct?

The diagram shows a circuit component.
What is it used for?

Which single logic gate behaves the same as the combination of logic gates shown?

Where must a fuse be connected in a mains electric circuit?

The N-pole of a magnet is moved into a coil of wire connected to a galvanometer.

The needle of the galvanometer moves.
Which situation must give a smaller galvanometer reading?

A step-down transformer is 100% efficient. It has an input voltage of 240V a.c. and an output voltage of 60V a.c. The current in the primary coil is 0.50A. What is the current in the secondary coil?

The diagrams show the simple atomic structure for two neutral atoms X and Y of different elements.

Which row is correct?
[Table_1]

Plutonium-238 decays by the emission of an \( \alpha \)-particle.
Which equation represents the decay of a plutonium-238 nucleus?

A radioactive isotope has a half-life of 8 days.
A detector close to a sample of this isotope gives a count rate of 200 counts per minute.
Without the source, the background count is 20 counts per minute.
What is the count rate due to the source after 8 days?

Why are some radioactive sources stored in boxes made from lead?