Cambridge IGCSE Physics - 0625 - Supplement Paper 2 2020 Winter Zone 3

A micrometer screw gauge reads 0.02 mm when the jaws are fully closed. It reads 0.56 mm when measuring the diameter of a metal wire.
What is the diameter of the wire?

Object P moves at a constant speed of 5 m/s repeatedly backwards and forwards in a straight line.
Object Q moves at a constant speed of 5 m/s vertically downwards.
Object R moves at a constant speed of 5 m/s in a circle.
Which objects are moving with uniform velocity?

The diagram shows a velocity–time graph for an object which is accelerating.



What is the acceleration of the object?

Which quantity is weight an example of?

An object of mass 1.0 kg is at rest on Earth. An identical object is at rest on a planet with a gravitational field strength of twice that on Earth.
Which row correctly compares the object on the planet to the object on Earth?
[Table below]

A square wooden raft floats on a lake. The density of the water in the lake is 1000\,\text{kg/m}^3.
The sides of the raft are 2.0\,\text{m} long and the thickness of the raft is 0.20\,\text{m}.
The mass of the raft is 700\,\text{kg}.
How many barrels, each of mass 100\,\text{kg}, could be placed on the raft before its surface sinks to the surface of the water?

The diagram shows a car moving along a road. The force due to the engine is 1500 N and the total drag force is 200 N. What is the motion of the car?

The diagram shows a trolley used to transport a load of 400 N.

A force $F$ vertically downwards is needed to balance the trolley as shown.

The centre of mass of the trolley is vertically above the pivot.



What is the value of $F$?

A ball of mass $m$ falls vertically and hits a hard surface. Its speed on hitting the surface is $v_1$. It rebounds vertically upwards with speed $v_2$. What is the change in momentum of the ball?

An object of mass 4.5 kg is travelling at 7.0 m/s.
How much kinetic energy does the object have?

A number of ways in which we use energy are listed. In which is the ultimate source of energy not the Sun?

To calculate the power produced by a force, the size of the force must be known. What else needs to be known to calculate the power? [Table_1]

A student calculates the pressure due to the liquid at point X.

The student takes four measurements.

1. density of the liquid
2. temperature of the liquid
3. depth of point X below the surface of the liquid
4. surface area of the liquid

The diagram shows a mercury barometer.
Which height is used as a measurement of atmospheric pressure?

A student splashes water on to her face. Here are three statements about the effects.
P The water uses energy to evaporate.
Q The water gains energy from the student.
R The face of the student cools.
Which statements are correct?

Equal volumes of solids and liquids experience different changes of volume when they are heated through the same temperature range. What is the reason for this?

Which physical property changes when temperature is measured with a liquid-in-glass thermometer?

The diagram shows steam being passed into water to raise the temperature of the water.



The specific latent heat of steam is 2200 J/g.
The specific heat capacity of water is 4.2 J/(g°C).
The mass of water being heated is 490 g.

Which mass of steam must be passed into the water to raise the water temperature from 19°C to 100°C?

The diagram shows the view of a room heated by a radiator. The arrowed line from X to Y is the path of the convection current in the air.

Which row about the air temperature and the air density at X and at Y is correct?

A warm dark-coloured surface emits radiation. It is decided to increase the amount of radiation produced.
Three suggestions are made.
1. Make the surface hotter.
2. Colour the surface white.
3. Increase the area of the surface.
Which suggestions are correct?

Which row correctly describes light waves?
[Table_1]

A water wave has a speed of 2.0 m/s.
4.0 complete waves pass a point every 10 seconds.
What is the wavelength of the wave?

A driver sits in a car. She has a rear-view plane mirror 0.5 m in front of her. A bus is 7.5 m behind the driver.

The driver looks at the image of the bus in her mirror.
How far is the image away from her?

The diagram shows white light passing through a prism.
Which description of what happens as the light passes into the prism is correct?

The diagram shows three types of electromagnetic radiation listed in a particular order. The electromagnetic radiation is travelling in a vacuum.

Which quantities increase in magnitude going from left to right across the list?

A sound wave travels through air. What name is given to a region in which the air molecules are further apart than normal?

A police car with its siren sounding is stationary in heavy traffic. A pedestrian notices that, although the loudness of the sound produced does not change, the pitch varies.
Which row describes the amplitude and the frequency of the sound?
[Table_1]

A piece of steel is slightly magnetised. It is hit several times with a hammer. What effect will this have on the steel? [Table_1]

A negatively charged cloud passes over a tall steel-framed building. A charge is induced on the building by the cloud because charges flow through the building.

What charge is induced on the building and in which direction do the charge carriers move?

Electromotive force (e.m.f.) is defined in terms of the energy supplied in driving which physical quantity around a complete circuit?

A student uses four ammeters P, Q, R, and S to measure the current in different parts of the circuit shown.
Which two ammeters read the largest current?

Three statements about a relay are given.
1. A relay has a coil that becomes a temporary magnet when in operation.
2. A large current in a relay coil is used to switch off a smaller current.
3. A small current in a relay coil is used to switch on a larger current.
Which statements are correct?

Which combination of logic gates gives the truth table shown?

[Table_1:

Graph X shows the output from an a.c. generator.

Which changes can be made so that the generator produces graph Y?

A transformer is needed to convert a supply of 240 V a.c. into 4800 V a.c..

Which pair of coils would be suitable for this transformer?
[Table_1]

The diagram shows a wire carrying a current in the direction shown. There is a magnetic field acting from left to right. The wire experiences a force acting out of the page. The current is now reversed. In which direction does the force on the wire now act?

Which statement is correct for the nucleus of any atom?

How many protons and how many neutrons are in a nucleus of $^{234}_{90}\text{Th}$?

Which statement about $\gamma$-rays is correct?

Which equation represents the $\beta$-decay of lead-209?