Cambridge CIE IGCSE Past Papers and solutions.

Questions and Worked Solutions for IGCSE Physics 2020 0625/23 May/June Paper 2.

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- Diagram 1 shows a solid, rectangular-sided block.

Diagram 2 shows the same block from the front and from the side.

Metre rules have been shown close to the edges of the block.

What is the volume of the block? - A student investigates the motion of a ball rolling down a slope.

The diagram shows the speed v of the ball at different times t.

Which statement describes the motion of the ball?

A The acceleration is not constant.

B The acceleration is negative.

C The speed is decreasing.

D The velocity is constant. - Which statement about acceleration is correct?

A It is related to the changing speed of an object.

B It is the distance an object travels in one second.

C It is the force acting on an object divided by the distance it travels in one second.

D It is the force acting on an object when it is near to the Earth. - Which statement correctly describes the effects of placing a heavy load in a car?

A It is easier to accelerate the car and easier to bring the car to rest.

B It is easier to accelerate the car but more difficult to bring the car to rest.

C It is more difficult to accelerate the car and more difficult to bring the car to rest.

D It is more difficult to accelerate the car but easier to bring the car to rest. - Which row gives the correct weight for the mass shown?

The value of g is 10 N/ kg. - A rectangular gymnasium is 50 m long, 25 m wide and 8.0 m high.

The density of air is 1.2 kg / m^{3}.

What is the best estimate of the mass of air in the gymnasium?

A 0.00012 kg B 100 kg C 8300 kg D 12 000kg - Which moving object has a resultant force acting on it?

A a diver rising vertically through water at constant speed

B an aircraft circling an airport at constant speed

C a parachutist descending vertically at terminal velocity

D a train going up a straight slope at constant speed - Which quantity is not a vector?

A acceleration

B temperature

C velocity

D weight - A ball falls vertically to the floor and rebounds vertically upwards.

Just before it hits the floor, its speed is 4.0 m / s.

As it rebounds, its speed is 3.0 m / s.

The mass of the ball is 0.50 kg.

What is the change in momentum of the ball?

A 0.50 kgm / s downwards

B 0.50 kgm / s upwards

C 3.5 kgm / s downwards

D 3.5 kgm / s upwards - A mass bounces up and down on a steel spring. The diagram shows the mass and the spring at
different points during the motion.

At which point does the mass have the least gravitational potential energy and at which point is the most elastic energy stored in the spring?

- The velocity v of an object increases as it falls towards the ground.

Which quantity is directly proportional to v^{2}?

A the speed of the object

B the gravitational potential energy of the object

C the kinetic energy of the object

D the momentum of the object - The diagram shows a solid block resting on a bench. The dimensions of the block are shown.
On which labelled surface should the block rest to produce the smallest pressure on the bench?

A P

B Q

C R

D P, Q and R produce the same pressure - A pipe full of water connects a water supply on a hill to a tap lower down the hill.

The length of the pipe is 500 m. The height of the supply above the tap is 100 m.

The density of the water is 1000 kg /m3. The effect of atmospheric pressure is negligible.

What is the water pressure at the tap?

A 100 000Pa

B 500 000Pa

C 1 000 000Pa

D 5 000 000Pa - When a molecule rebounds from a wall, a force is exerted on the wall.

What causes this force?

A the kinetic energy gained by the molecule

B the kinetic energy lost by the molecule

C the change of momentum of the molecule

D the change of speed of the molecule - The relationship between pressure p and volume V of a gas is given as pV = constant.

Under which conditions for the mass of a gas and for its temperature does the equation hold? - The diagram shows a liquid-in-glass thermometer.

Which row gives the correct labels for the thermometer? - The diagrams show four blocks of steel. The blocks are all drawn to the same scale.

The same quantity of thermal energy is given to each block.

Which block shows the greatest rise in temperature? - Why are metals better conductors of thermal energy than non-metals?

A They contain free electrons.

B Their molecules are further apart.

C Their molecules vibrate at a higher frequency.

D They have smoother surfaces. - The diagram shows a vacuum flask used to keep a liquid warm.

Which methods of heat loss are reduced by the vacuum between the silvered walls?

A conduction only

B conduction and convection only

C convection and radiation only

D conduction, convection and radiation - An earthquake-monitoring station records the arrival of 16 complete waves of an earthquake
wave in 20 s.

The speed of the earthquake wave is 6.0 km /s.

What is the wavelength of the earthquake wave? - The diagram shows a wave.

What are the amplitude and the wavelength of this wave? - Which statement is correct?

A The speed of light in glass is equal to the speed of light in a vacuum multiplied by the refractive index of glass.

B The incident angle of a light ray at an air-glass surface is the angle between the ray and the glass surface.

C The sine of the critical angle at an air-glass surface is equal to 1/refractive index of glass.

D The angle of refraction for light passing through an air-glass surface is proportional to the angle of incidence at that surface. - Which statement about converging lenses is correct?

A A real image of an object projected onto a screen by a converging lens is always inverted.

B The image formed by a converging lens is always upright.

C The image formed by a converging lens when used as a magnifying glass is a real image.

D Parallel rays entering a converging lens are focused at a distance greater than the focal length from the lens. - An intruder alarm sensor detects that a person is warmer than his surroundings.

Which type of electromagnetic wave does the sensor detect?

A infrared

B radio

C ultraviolet

D visible light - Two people are standing outdoors on either side of a high wall.

Person 1 can hear person 2 talking although he cannot see her.

Which statement explains this?

A The sound waves have diffracted around the wall.

B The sound waves have passed unaffected through the wall.

C The sound waves have reflected around the wall.

D The sound waves have refracted around the wall. - Four nails A, B, C and D are tested to find which makes the strongest permanent magnet.

One of the nails is placed against a bar magnet and the number of paper clips which the nail can support is recorded.

The bar magnet is then removed and the number of paper clips remaining attached to the nail is recorded. Each nail is tested individually.

Which nail becomes the strongest permanent magnet? - The diagrams show a magnetised steel rod inside a solenoid connected to a potentiometer.

In diagram 1, the potentiometer is connected to a d.c. power supply.

In diagram 2, the potentiometer is connected to an a.c. power supply.

Which action would demagnetise the piece of steel? - The diagram shows a positively charged conducting sphere and a wire connected to earth.

What happens when the wire is touched onto the sphere?

A Electrons flow from earth to the sphere.

B Electrons flow from the sphere to earth.

C Positive charges flow from earth to the sphere.

D Positive charges flow from the sphere to earth. - A student uses the circuit shown to determine the resistance of two identical resistors.

The voltmeter reading is 2.2V and the ammeter reading is 0.25A.

What is the resistance of each resistor? - There is a current of 2.0A in a resistor of resistance 8.0Ω.

How much power is dissipated in the resistor? - The lamps, the diodes and the batteries in the circuits are identical.

In which circuit does the ammeter give the greatest reading? - Two resistors are connected in series with a power supply.

Which statement about the circuit is correct?

A The current from the supply is greater than the current in each resistor.

B The current from the supply is equal to the current in each resistor.

C The current from the supply is less than the current in each resistor.

D The current from the supply is the sum of the currents in each resistor. - Which two logic gates each have a high output when both of their inputs are high?

A AND and OR

B AND and NOR

C NAND and NOR

D NAND and OR - The diagram shows a series of logic gates and part of its corresponding truth table.

What are the missing values in row 2 of the truth table? - The graphs show how the currents in three circuits vary with time.

In which circuits is there a direct current? - The coil of a simple a.c. generator rotates steadily in a uniform magnetic field.

The diagram shows the position of the coil at time t = 0.

Which graph shows the output voltage for one revolution of the coil? - What occurs during nuclear fusion?

A Two light atomic nuclei join together and emit energy.

B Two light atomic nuclei join together and absorb energy.

C A heavy atomic nucleus splits and emits energy.

D A heavy atomic nucleus splits and absorbs energy. - A radioactive material has a half-life of 20 days.

A sample of the material contains 8.0 × 10^{10}atoms.

How many atomic nuclei have decayed after 60 days? - A thin sheet of paper is placed between a radioactive source and a radiation detector. The count rate falls to a very low reading.

From this result, which type of radiation is the source emitting? - α-particles, β-particles and γ-rays are emitted by radioactive nuclei when they decay.

Which emissions can be deflected by an electric field?

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