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A plumber measures, as accurately as possible, the length and internal diameter of a straight copper pipe. The length is approximately 80 cm and the internal diameter is approximately 2 cm. What is the best combination of instruments for the plumber to use? internal diameter rule length rule, internal diameter rule length tape, internal
What is the correct unit for the quantity shown? quantity electromotive force (e.m.f.) unit N, quantity latent unit heat J, qua
Which vehicle has an acceleration of 5 m / s2? a bicycle, when its speed changes from rest to 2.5 m / s in 2 s, a car, when its speed changes from
A student collects stones and finds their density. Which apparatus is needed to measure the mass and the volume of the stones? mass newton meter volume measuring cylinder and water, mass newton meter volume r
The diagram represents parts of a power station. coal-fired boiler ? turbine ? electricity generator What is the order of the energy changes taking place? chemical ? heat ? kinetic ? electrical, chemical ? kinetic ? heat ? electrical, heat ? chemical ? k
The centre of the Sun produces large amounts of energy. What is the source of this energy? chemical reaction, nuclear fission, nuclear fusion, radioactive decay
A crane lifts a weight of 1000 N through a vertical height of 30 m. It uses 60 000 J of energy. What is the efficiency of the crane? 0.2, 0.3, 0.5, 2
According to the kinetic theory, matter is made up of very small particles in a constant state of motion. Which row best describes the particle behaviour in the liquid state? strong move randomly at high speed, strong vibrate but are free to move position, strong vibrate t
A balloon filled with air is gently heated.What happens to the mass and the density of the air inside the balloon? mass decreases density decreases, mass decreases density stays the same, mass st
A certain liquid is used in a liquid-in-glass thermometer. It does not expand uniformly with temperature. What effect will this have on the scale of the thermometer? It will be non-linear., It will have a small range., The markings will be close together., The ma
Fillings in teeth should be made from a material which does not expand when heated., expands by the same amount as the tooth when heated., expands less t
Which application may use the part of the electromagnetic spectrum called microwaves? cooking vegetables, detecting small cracks in metals, gaining a sun-tan, lighting a fluorescent t
Sound travels at different speeds in air, water and steel. For these materials, which row is correct? sound travels slowest in air sound travels fastest in steel, sound travels slowest in air
Which list contains an example of a non-magnetic material, a magnetic material and a magnetised material? copper, iron, a compass needle, copper, iron, polythene, iron, steel, a compass needle, iron, ste
To charge an isolated metal sphere by induction, the following four processes are required. P The sphere is earthed by touching it. Q The earth connection is removed from the sphere. R A charged rod is brought close to the sphere. S The charged rod is removed. P ? Q ? R ? S, P ? R ? S ? Q, R ? P ? Q ? S, R ? P ? S ? Q
Which changes both cause a decrease in the resistance of a copper wire? size of wire decrease in length temperature of wire lower, size of wire increase in le
A lamp rated 6 V, 2 A is switched on for 60 s. How much energy is used? 0.2 J, 20 J, 180 J, 720 J
The coil in an electric motor is wound onto a cylinder.Why is the cylinder made of soft iron? to deflect the magnetic field away from the coil, to increase the current through the coil, to inc
The electromotive force (e.m.f.) induced in a conductor moving at right-angles to a magnetic field does not depend upon the length of the conductor., the resistance of the conductor., the speed of the conductor., the
Tritium is a radioactive isotope of hydrogen with a half-life of 12 years. If a sample starts with 40 million atoms of tritium, how many atoms of tritium will be left after 12 years? 40 million, 20 million, 10 million, 5 million
A radioactive nuclide 238 / 92 U decays into thorium by emitting an alpha-particle. The thorium then decays into protactinium by emitting a beta-particle. What is the symbol for protactinium? 230 / 90 Pa, 234 / 89 Pa, 234 / 90 Pa, 234 / 91 Pa
A plumber measures, as accurately as possible, the length and internal diameter of a straight copper pipe.The length is approximately 80 cm and the internal diameter is approximately 2 cm.What is the best combination of instruments for the plumber to use? internal diameter rule length rule, internal diameter rule length tape, internal di
What is the correct unit for the quantity shown? quantity electromotive force (e.m.f.) unit N, quantity latent heat unit J, quantity
Which vehicle has an acceleration of 5 m / s2? a bicycle, when its speed changes from rest to 2.5 m / s in 2 s, a car, when its speed changes from
A student collects stones and finds their density. Which apparatus is needed to measure the mass and the volume of the stones? mass newton meter measuring volume cylinder and water, mass newton meter volume rule
The diagram represents parts of a power station. coal-fired boiler ? turbine ? electricity generator What is the order of the energy changes taking place? chemical ? heat ? kinetic ? electrical, chemical ? kinetic ? heat ? electrical, heat ? chemical ?
The centre of the Sun produces large amounts of energy. What is the source of this energy? chemical reaction, nuclear fission, nuclear fusion, Radioactive decay
A crane lifts a weight of 1000 N through a vertical height of 30 m. It uses 60 000 J of energy. What is the efficiency of the crane? 0.2, 0.3, 0.5, 2
According to the kinetic theory, matter is made up of very small particles in a constant state of motion. Which row best describes the particle behaviour in the liquid state? forces between particles strong motion of particles move randomly at high speed, forces be
A balloon filled with air is gently heated. What happens to the mass and the density of the air inside the balloon? mass decreases density decreases, mass decreases density stays th
A certain liquid is used in a liquid-in-glass thermometer. It does not expand uniformly with temperature. What effect will this have on the scale of the thermometer? It will be non-linear., It will have a small range., The markings will be close together., The ma
Fillings in teeth should be made from a material which does not expand when heated., expands by the same amount as the tooth when heated., expands less th
Which application may use the part of the electromagnetic spectrum called microwaves? cooking vegetables, detecting small cracks in metals, gaining a sun-tan, lighting a fluorescent tu
Sound travels at different speeds in air, water and steel.For these materials, which row is correct? sound travels slowest in air sound travels fastest in steel, sound travels slowest i
Which list contains an example of a non-magnetic material, a magnetic material and a magnetised material? copper, iron, a compass needle, copper, iron, polythene, iron, steel, a compass needle, iron, ste
To charge an isolated metal sphere by induction, the following four processes are required.P The sphere is earthed by touching it.Q The earth connection is removed from the sphere.R A charged rod is brought close to the sphere.S The charged rod is removed.In which order can these stages P ? Q ? R ? S, P ? R ? S ? Q, R ? P ? Q ? S, R ? P ? S ? Q
Which changes both cause a decrease in the resistance of a copper wire? size of wire decrease in length temperature of wire lower, size of wire increase in l
A lamp rated 6 V, 2 A is switched on for 60 s.How much energy is used? 0.2 J, 20 J, 180 J, 720 J
The coil in an electric motor is wound onto a cylinder.Why is the cylinder made of soft iron? to deflect the magnetic field away from the coil, to increase the current through the coil, to inc
The electromotive force (e.m.f.) induced in a conductor moving at right-angles to a magnetic field does not depend upon the length of the conductor., the resistance of the conductor., the speed of the conductor., the st
Tritium is a radioactive isotope of hydrogen with a half-life of 12 years. If a sample starts with 40 million atoms of tritium, how many atoms of tritium will be left after 12 years? 40 million, 20 million, 10 million, 5 million
A radioactive nuclide 238 / 92 U decays into thorium by emitting an alpha-particle. The thorium then decays into protactinium by emitting a beta-particle. What is the symbol for protactinium? 230 / 90 Pa, 234 / 89 Pa, 234 / 90 Pa, 234 / 91 Pa
The diameter and the length of a thin wire, approximately 1 m in length, are measured as accurately as possible.What are the best instruments to use? micrometer rule, micrometer vernier calipers, rule tape, vernier calipers rule
A quantity is quoted as having a value of 6.2 ms.In what units is it measured? metres, metres per second, microseconds, milliseconds
The efficiency of an electrical generator is 65 %. The energy input to the generator is 12 kJ.What is the useful energy output? 4.2 kJ , 5.4 kJ, 7.8 kj, 780 kj
Coal is burned as fuel to heat water in a boiler, producing steam. The steam drives a turbine, which is connected to an electric generator.In which order do the major energy transformations take place? chemical energy ? heat energy ? electrical energy ? kinetic energy, chemical energy ? heat energy ?
Objects with different weights are placed on a rigid, horizontal surface.Which row shows the correct pressure acting on the surface? weight / N 10 area in contact / m2 N/m2 0.1 pressure 1 , weight / N 20 area in contact
How does heat transfer through a vacuum take place? by conduction, convection and radiation, by conduction only, by convection only, by radiation onl
Which row explains why a liquid has a fixed volume but does not have a fixed shape? large move throughout the liquid, large vibrate at fixed positions, small move throughout the liqu
To raise the temperature of a 2.0 kg block of metal by 20 °C, energy of 5.2 kJ is needed.What is the value of the specific heat capacity of the metal? 0.13 J / (kg °C), 52 J / (kg °C), 130 J / (kg °C), 52 000 J / (kg °C)
What makes a clinical thermometer suitable for measuring small changes in body temperature? The amount of mercury in the bulb is small., The bore of the capillary tube is narrow., The capillar
How do the speed and the wavelength of red light in air compare with the speed and the wavelength of violet light in air? speed of red light greater wavelength of red light greater, speed of red light greater
The current in a filament lamp is 0.25 A when working normally. The lamp is connected to a plug and the mains a.c. supply. When the lamp is switched on, it does not light.What is a possible cause for this? The earth wire in the plug is not connected., The fuse in the plug is 3 A., The lamp only works on
Which appliance used on a 240 V supply is most likely to burn out its fuse? appliance 100 W lamp fuse 1 A, appliance 1 kW vacuum cleaner fuse 5 A, appliance
One component of a simple d.c. motor is a split-ring commutator. Which metal is used to make the commutator, and why is this metal chosen? metal copper reason it is a good conductor of electricity, metal copper reason it is a
The isotope barium-140 has a half-life of 13 days. A sample of this isotope is kept for 13 days. Which quantity halves during this time? the number of atoms of barium-140 in the sample, the number of electrons in an atom of barium-140,
A crane lifts a weight of 1000 N through a vertical height of 30 m. It uses 60 000 J of energy. What is the efficiency of the crane? 0.2, 0.3, 0.5, 2
Which list contains an example of a non-magnetic material, a magnetic material and a magnetised material? copper, iron, a compass needle, copper, iron, polythene, iron, steel, a compass needle, iron, ste
The coil in an electric motor is wound onto a cylinder.Why is the cylinder made of soft iron? to deflect the magnetic field away from the coil, to increase the current through the coil, to inc
Tritium is a radioactive isotope of hydrogen with a half-life of 12 years. If a sample starts with 40 million atoms of tritium, how many atoms of tritium will be left after 12 years? 40 million, 20 million, 10 million, 5 million