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

Which is the best apparatus to use to measure the thickness of a coin?

The graph shows how the speed of an object varies with time. At which labelled time is the object decelerating?

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

Which equation shows the relationship between the weight $W$ and the mass $m$ of an object?

A box of mass 2.0 kg is pulled across a horizontal floor by a force of 6.0 N.
The frictional force acting on the box is 1.0 N.
What is the acceleration of the box?

Four hollow glass spheres P, Q, R and S each have a mass of 72 g.
Their volumes are given in the table.
[Table_1]
Which spheres sink in a liquid of density 0.9 g/cm^3?

The diagram shows a uniform metre rule. The rule is pivoted at its mid-point. A downward force of 4.0 N acts on the rule at the 5 cm mark. The rule is held by a string at the 30 cm mark. The rule is in equilibrium.

What is the upward force that the string exerts on the rule?

A ship sails due North at a speed of 20 m/s. A current in the water begins to move from East to West. The speed of this current is 20 m/s.

What is the magnitude of the resultant velocity of the ship?

The momentum of a body is changed by a force acting on it for a period of time.
Which action increases the change in momentum?

A toy train P of mass 0.50 kg is travelling along a straight track with a velocity of 3.0 m/s. It collides with a stationary train Q of mass 1.0 kg. The two trains then stick together.
What is the velocity of the combined trains?

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 force of 25 N acts on an object. The work done by the force is 400 J.
How far does the object move in the direction of the force?

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.

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?
[Table_1]

Which row compares the separation and the motion of the molecules of a hot gas with those of a cool liquid? (Both the gas and the liquid are at the same pressure.)

[Table_1]

A fixed mass of gas has a volume of 25 cm$^3$. The pressure of the gas is 100 kPa.
The volume of the gas is slowly decreased by 15 cm$^3$ at constant temperature.
What is the change in pressure of the gas?

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?

The diagram shows a liquid-in-glass thermometer.
When the temperature of the thermometer rises, the changes produced cause the liquid thread to move to the right.
Why does this happen when the temperature of the thermometer rises?

A sealed metal box contains a fixed mass of air. The sides of the box are insulated.

A scientist investigates the thermal conductivity of air. She measures how quickly thermal energy passes between the top and bottom of the box. Which row gives the correct procedure and conclusion?
[Table_1]

In a cold country, the ground is covered in snow. There is a pile of black sand outdoors and its temperature is the same as that of the snow. A man sprinkles a thin layer of this sand over the snow.
Why does the black sand help to melt the snow during the day?

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?
[Table_1]

A person stands 1.0 m in front of a plane mirror. The mirror is moved away from the person at a speed of 1.0 m/s. Which statement is correct?

White light is refracted and dispersed when it enters a glass prism from air.
Which colour has the lowest speed as it moves through the glass prism?

The diagram shows the electromagnetic spectrum.

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 3.0 A in a resistor for time $t$. During time $t$, a charge of 120 C flows through the resistor.
What is time $t$?

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 resistance $1.0\,\Omega$, $2.0\,\Omega$ and $3.0\,\Omega$ are connected in parallel across the terminals of a cell.
Which statement is correct?

Diagram 1 shows a circuit containing an a.c. power supply, an unknown component X and a fixed resistor.
The graph in diagram 2 shows how the potential difference (p.d.) across the resistor varies with time.

What is component X?

An AND gate has two inputs and one output. Which truth table represents the action of the AND gate?

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

A wire XY is connected to a resistor R. The wire is moved in the magnetic field between two magnetic poles. In which direction must the wire be moved so that the induced current is in the direction shown?

A step-up transformer produces a 60V a.c. output from a 12V a.c. input.
There are 50 turns on the secondary coil.
How many turns are there on the primary coil?

An a.c. generator contains a coil that rotates at a rate of 4500 revolutions per minute.
What is the frequency of the alternating current?

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

The diagram represents a neutral atom.

Which row identifies each type of particle in the diagram?
[Table_1]

A thin metal foil is placed in a vacuum. $\alpha$-particles are fired at the foil and most go straight through. A very small proportion of the $\alpha$-particles are deflected through large angles.
What does this provide evidence for?

The background count rate measured by a radiation counter is 40 counts per minute.
With the counter close to a radioactive source, the counter reading is 960 counts per minute.
The half-life of the source is 20 minutes.
What is the counter reading one hour later?