Cambridge IGCSE Physics - 0625 - Core Paper 1 2010 Winter Zone 3

A student is trying to find the density of water and of a large, regularly shaped concrete block.
Which apparatus is needed to find the density of both the water and the concrete block?

Liquid X has a density of 1010 kg/m^3. Liquid Y has a density of 950 kg/m^3.
The liquids are poured into tubes as shown.
Which tube has the greatest pressure on its base?

What is a simple mercury barometer designed to measure?

The diagrams show an experiment to determine the volume of a stone.

What is the volume of the stone?

The reading on a spring balance with a holder and eight identical discs is 3.0 N. Six discs are removed and the reading becomes 1.2 N.

What is the weight of one disc?

The extension/load graph for a spring is shown. The unloaded length of the spring is 15.0 cm.

When an object of unknown weight is hung on the spring, the length of the spring is 16.4 cm.
What is the weight of the object?

Four athletes run twice around a track. The table shows their times at the end of each lap.
Which athlete runs the second lap the fastest?
[Table_1: athlete time at end of first lap/s time at end of second lap/s
A 22.99 47.04
B 23.04 47.00
C 23.16 47.18
D 23.39 47.24]

A car travels along the route PQRST in 30 minutes.
What is the average speed of the car?

The diagram shows the speed/time graph for an object moving at constant speed.

What is the distance travelled by the object in the first 3 s?

Which list contains the name of a force?

A force acts on a moving rubber ball.
Which of these changes could not happen to the ball because of the force?

A car is driven on a long journey along a flat, horizontal road. The car stops several times on the journey and its engine becomes hot.
Which type of energy does not change during the journey?

Which of these is designed to change electrical energy into kinetic energy?

An electric heater is placed inside a metal box which has one side open. The diagram shows four possible positions for the box.
The heater is switched on for several minutes.
In which position does the box become the hottest?

Some gas in a sealed plastic bag is cooled. How do the gas molecules behave when this happens?

Which change is condensation?

A block of ice cream is prevented from melting by wrapping it in newspaper soaked in water. The water evaporates from the newspaper.
Which molecules escape from the water and what happens to the average speed of the water molecules that remain in the newspaper?

A beaker containing ice and a thermometer is left in a warm room for 15 minutes. No water is visible in the beaker until 5 minutes has passed. After 15 minutes some ice is still visible. Which graph shows how the thermometer reading changes?

A piece of wood has some iron nails pushed through it. One side of the wood is covered with heat sensitive paper which turns from pink to blue when heated. The wood is heated as shown for a few minutes and blue dots appear on the heat sensitive paper where it touches the nails.

This experiment shows that, compared to wood, iron is a good

Which group contains only transverse waves?

The diagrams represent two different sound waves. How do the frequency and pitch of P compare with the frequency and pitch of Q?

A ship sends a pulse of sound vertically downwards to the sea bed. An echo is heard 0.4 seconds later. If the speed of sound in the water is 1200 m/s, how deep is the water below the ship?

A girl writes the word LEFT on a piece of card. She looks at the image of this card, made by reflection by a plane mirror. What does she see?

Water waves in a tank pass over a thin plastic block as shown.

What happens to the waves as they reach the plastic block?

A scientist is trying to direct a ray of light through a glass block without any light leaving the top of the block. However, some light does leave the top.
The scientist changes angle X and stops the ray of light leaving the top.
Which row in the table describes the change to angle X and the name of the effect produced?

Which statement about a magnet is not correct?

A chain of steel nails and a chain of iron nails hang from a strong magnet. The chains are then carefully removed from the magnet.

What happens to the chains?

The diagram shows a circuit containing two ammeters and three resistors.

Which of the ammeters will show the current in resistor $R_2$?

A circuit contains two resistors connected in parallel with a battery.
Which of the following statements about the currents at P, Q and R is true?

A potential difference (p.d.) across a resistor causes a current in it.

The p.d. and the resistance of the resistor can both be changed.
Which row shows two changes that will both increase the current in the resistor?
[Table_1]

The potential divider shown is connected across a constant 12V supply.



When R has a value of 20\( \Omega \), the voltmeter readings are equal.
How do these readings change when the value of R is reduced to 10\( \Omega \)?

Which component can store energy and can be used in time-delay circuits?

A coil is rotated steadily between the poles of a magnet. The coil is connected to an oscilloscope.
Which graph shows the output voltage $V$ against time $t$?

A fuse is a safety device for use in an electrical appliance.
How does a fuse affect a circuit when the current in it becomes higher than the correct value for the appliance?

Some electrical equipment is connected to a 230 V supply. It is kept inside a metal case which is not earthed. The case is fixed to a plastic support. A strand of wire has become loose and touches the metal case as shown. Which statement about this situation is correct?

A village has to be supplied with electricity from a power station that is a long way from the village.
Which type of current should be used, and at which voltage?[Table_1]

An electric field is set up between two parallel plates.
Cathode rays are directed into this field, parallel to the plates.


In which direction are the cathode rays deflected by the electric field?

S is a radioactive source emitting $\alpha$-particles, $\beta$-particles and $\gamma$-rays. A detector is placed 5 cm away from S. A thin sheet of paper is placed as shown in the diagram.

Which radiations can be detected?

A radioactive element has a half-life of 70s.
The number of emissions per second, $N$, of a sample of the element is measured at a certain time.
What was the number of emissions per second 70s earlier?

In the atomic model, an atom consists of a central mass, orbited by much smaller particles. What is the name of the central mass and of the orbiting particles? [Table_1]