Cambridge IGCSE Physics - 0625 - Core Paper 1 2011 Summer Zone 2

A tennis player hits a ball hard and 0.40s later hears the echo from a wall.
The speed of sound in air is 330 m/s.
How far away is the player from the wall?

The diagram shows an enlarged drawing of the end of a metre rule. It is being used to measure the length of a small feather.
What is the length of the feather?

Water waves can be used to show reflection, refraction, and diffraction. For each of these, which row shows whether or not the speed of the water waves changes? [Table_1]

The diagram shows a balance being used to find the weight of a baby. The weight of the basket can be ignored. At equilibrium, the pivot is nearer to the weight $W$ than to the baby.

What is the weight of the baby?

Which statement about mass and weight is correct?

An object moves initially with constant speed and then with constant acceleration. Which graph shows this motion?

A cube of side 2.0 cm is placed on a balance.
What is the density of the cube?

An ice cube at a temperature of 0°C is put into a drink at a temperature of 10°C.
After a short time, some of the ice has melted and the drink has cooled to a temperature of 8°C.
What is the temperature of the remaining ice?

The diagram shows a thermometer calibrated in degrees Celsius. What are the values of the lower fixed point and of the upper fixed point on the Celsius scale?

An experiment is set up to find out which metal is the best conductor of heat. Balls are stuck with wax to rods made from different metals, as shown in diagram 1. The rods are heated at one end. Some of the balls fall off, leaving some as shown in diagram 2. Which labelled metal is the best conductor of heat?

Objects with different masses are hung on a spring. The diagram shows how much the spring stretches. The extension of the spring is directly proportional to the mass hung on it. What is the mass of object M?

When a liquid evaporates, some molecules escape from it and its temperature changes.
From where do the molecules escape and what is the effect on the temperature of the liquid?
[Table_1]

A sealed gas cylinder is left outside on a hot, sunny day. What happens to the average speed of the molecules and to the pressure of the gas in the cylinder as the temperature rises? [Table_1]

The diagram shows two mercury barometers.
Barometer 1 is measuring atmospheric pressure on day 1.
Barometer 2 is measuring atmospheric pressure on day 2.

Which statement is true?

Which row gives an example of the stated form of energy?
[Table_1: A. gravitational - the energy due to the movement of a train along a level track]
[Table_1: B. internal - the energy due to the flow of cathode rays in a cathode-ray tube]
[Table_1: C. kinetic - the energy due to the position of a swimmer standing on a high diving board]
[Table_1: D. strain - the energy due to the compression of springs in a car seat]

A brick with flat, rectangular sides rests on a table.

The brick is now turned so that it rests on the table on its smallest face.

How has this affected the force and the pressure exerted by the brick on the table?
[Table_1]

Two farmers use an electrically powered elevator to lift bales of hay. All the bales of hay have the same mass.

As sunset approaches, they increase the speed of the motor so that more bales are lifted up in a given time.
How does this affect the work done in lifting each bale and the useful output power of the motor?

Which energy resource is used to generate electricity by first boiling water?

A thin converging lens is used to produce, on a screen, a focused image of a candle.

[Image_1: Diagram showing a candle, lens, and screen with focused image]

Various focused images are produced on the screen by moving the lens and the screen backwards and forwards.

Which statement is always correct?

Food is kept in a cool-box which uses two ice packs to keep it cool.
Where should the ice packs be placed to keep all the food as cool as possible?

Sound travels by wave motion.
Which property of waves causes echoes?

A student listens to a machine that makes sounds of different frequencies. He can only hear one of the sounds. Which frequency of sound is the student able to hear?

The diagram shows the dispersion of white light by a glass prism.

Why does dispersion occur when white light enters the glass?

A vertical stick is dipped up and down in water at P.
In two seconds, three wave crests are produced on the surface of the water.

Which statement is correct?

An ammeter and an 18\,\Omega resistor are connected in series with a battery. The reading on the ammeter is 0.50\,\text{A}. The resistance of the battery and the ammeter can be ignored.

What is the electromotive force (e.m.f.) of the battery?

In two separate experiments, a magnet is brought near to an unmagnetised iron bar. This causes the bar to become magnetised.



Which magnetic poles are induced at X and at Y?

Which circuit includes a capacitor and what does the capacitor do in this circuit?

[Table_1]

Which test could be used to find which end of a magnet is the north pole?

The diagram shows a thermistor in a potential divider. A voltmeter is connected across the thermistor.

The graph shows how the resistance of the thermistor changes with temperature.
[Graph]
As the thermistor becomes warmer, what happens to its resistance and what happens to the reading on the voltmeter?
[Table_1]

A polythene rod repels an inflated balloon hanging from a nylon thread.
What charges must the rod and the balloon carry?

A student sets up the circuit shown. The switch is open (off).



Which lamps are on and which lamps are off?

A magnet is suspended from a spring so that it can move freely inside a coil. The coil is connected to a sensitive centre-zero ammeter.
What does the ammeter show when the magnet repeatedly moves slowly up and down?

Which graph shows how the output voltage varies with time for a simple a.c. generator?

The diagram shows a simple step-down transformer used to decrease a voltage.
Which part is the primary coil?

In this circuit, a component at X automatically protects the wiring from overheating if there is a fault.
Which components are suitable to use at X?

An atom of the element lithium has a nucleon number of 7 and a proton number of 3. Which diagram represents a neutral atom of lithium?

A powder contains 400mg of a radioactive material that emits $\alpha$-particles.
The half-life of the material is 5 days.
What mass of that material remains after 10 days?

Which row shows the relative ionising effects and penetrating abilities of $\alpha$-particles and $\beta$-particles?
[Table_1]

A beam of cathode rays passes between two parallel metal plates connected to a high-voltage d.c. power supply.
Which path does the beam follow?

The diagram shows a cathode-ray tube.

What are the correct labels for X and for Y?