Cambridge IGCSE Physics - 0625 - Supplement Paper 2 2017 Summer Zone 1

What is the most accurate and precise method to measure the thickness of a coin?

On Earth, a ball is dropped and falls 2.0 m in a vacuum.
The acceleration of the ball at 1.0 m is 10 m/s².



What is the acceleration of the ball at 0.5 m?

A skydiver reaches terminal velocity. Then he opens his parachute.
What happens to the skydiver as the parachute opens?

A piece of steel is taken from the Earth to the Moon for an experiment. The gravitational field strength on the Moon is smaller than on the Earth.
Which statement about the piece of steel is correct?

A measuring cylinder containing only water is placed on an electronic balance. A small, irregularly shaped stone is now completely immersed in the water. The diagrams show the equipment before and after the stone is immersed.
[Image_1: Diagram of measuring cylinder and balance] What is the density of the material of the stone?

A boat is travelling at a steady speed in a straight line across the surface of a lake.
Which statement about the boat is correct?

A ball of weight 1.2 N drops through the air at terminal velocity.
A sudden gust of wind exerts a horizontal force of 0.5 N on the ball from the left.
Which diagram shows the resultant force on the ball while the wind is blowing?

The diagram shows a uniform bridge, 4.0 m long and weighing 10 000 N.
The bridge is pivoted at one end. A force at the other end gradually increases until the bridge begins to lift.
What is the lifting force as the bridge starts to move upwards?

A bullet of mass 0.10 kg travels horizontally at a speed of 600 m/s. It strikes a stationary wooden block of mass 1.90 kg resting on a frictionless, horizontal surface.
The bullet stays in the block.
What is the speed of the bullet and the block immediately after the impact?

A box of mass $m$ slides down a slope of length $l$ and vertical height $d$ against a frictional force $F$.

As the box slides down the slope, it loses gravitational potential energy and it does work against the friction.
Which row gives the loss in gravitational potential energy and the work done against friction?

The diagram represents the energy transfers for a device.
The device is 50% efficient. Which equation is correct?

A student carries out some simple exercises.
In which exercise is the most work done?

Four different liquids are poured into four containers.
The diagrams show the depth and the density of liquid in each container.
In which container is the pressure on its base the greatest?

Brownian motion is observed when using a microscope to look at smoke particles in air. What causes the smoke particles to move at random?

Gas molecules striking a container wall cause a pressure to be exerted on the wall. Which statement explains this?

Equal masses of two different liquids are put into identical beakers. Liquid 1 is heated for 100s and liquid 2 is heated for 200s by heaters of the same power. Each liquid has the same rise in temperature.
Which statement is correct?

Water of mass 100g at a temperature of 100°C is converted into steam at 100°C. The specific latent heat of vaporisation of water is 2300 J/g.
How much thermal energy is absorbed by the water?

A copper bar and a wooden bar are joined. A piece of paper is wrapped tightly around the join. The bar is heated strongly at the centre for a short time, and the paper goes brown on one side only.
Which side goes brown, and what does this show about wood and copper?

Different waves hit barriers with different sized gaps. The waves will diffract. In which diagram does the greatest spreading occur?

A converging lens is used as a magnifying glass to view an object. Which statement is correct?

Which diagram shows what happens when a ray of white light passes through a prism?

Light travels in a vacuum and then enters a glass block. The speed of the light in the glass block is $2.0 \times 10^8 \text{ m/s}$.
Which statement about the speed of light is correct?

A fire alarm is not loud enough and the pitch is too low. An engineer adjusts the alarm so that it produces a louder note of a higher pitch. What effect does this have on the amplitude and on the frequency of the sound?
[Table_1]

In a child's toy, metal fish are lifted out of a toy pond using a metal rod. The fish are magnetically attracted to the end of the rod. There is no magnetic force between the fish themselves.

What are possible materials from which the fish and the rod are made?

What is the most effective method of demagnetising a bar magnet?

A magnet near a coil of wire is attracted to the coil only when there is a current in the coil. Which statement explains this force of attraction?

A student rubs a plastic rod with a cloth. The rod becomes positively charged. What has happened to the rod?

Which quantity is measured in coulombs?

A cylinder of conducting putty has length $l$, diameter $d$ and resistance $R$. The putty is now moulded into a cylinder of diameter $2d$ that has the same volume.
By which factor does the resistance of the putty cylinder decrease?

The average current during a lightning strike between a cloud and the ground is $1.5 \times 10^4 \text{ A}$.
The lightning releases $3.0 \times 10^8 \text{ J}$ of energy and lasts for $2.0 \times 10^{-4} \text{ s}$.
What is the average electromotive force (e.m.f.) between the cloud and the ground?

A student connects a variable potential divider (potentiometer) circuit.
What happens to the reading on the voltmeter as the sliding terminal T is moved from R to S?

The circuit diagram shows a circuit with an a.c. supply, a diode and a resistor.

Which diagram shows how the current $I$ in the resistor varies with time $t$?

A light-dependent resistor (LDR) and a resistor R are connected in a series circuit. Light falls on the LDR.
The brightness of the light falling on the LDR decreases.
What happens to the resistance of the LDR and what happens to the reading on the ammeter?

[Table_1]

The diagram shows a logic gate.
Which input combinations at P and Q gives an output of 0 at R?
[Table_1]

A simple d.c. electric motor is fitted with a coil that rotates in a magnetic field. A commutator connects the power supply to the coil.
What is the purpose of the commutator?

What is the purpose of a relay?

Which row gives the relative charge of an electron, a neutron and a proton?
[Table_1]

A nuclide of element X undergoes $\beta$-decay.
Which statement is correct?

A sample of radioactive isotope is decaying. The nuclei of which atoms will decay first?

A detector of ionising radiation gives a background reading of 20 counts/minute. A radioactive isotope with a half-life of 2.0 days is brought near to the detector. The reading on the detector increases to 100 counts/minute. How long does it take for the reading on the detector to decrease to 40 counts/minute?