Atomic Structure, Conductors and Heat There was an error trying to submit your form. Please try again. What does an atom consist of? * A central nucleus only, with no orbiting particles A central nucleus surrounded by electrons revolving in definite orbits A cloud of neutrons surrounding a central electron A ring of protons surrounding an empty core This field is required. The dense core at the centre of an atom (the nucleus) is made up of: * Protons and electrons Neutrons and electrons Protons and neutrons Only protons This field is required. Which force holds the protons and neutrons together in the nucleus? * Strong nuclear force Gravitational force only Cohesive force Kinetic force This field is required. Which sub-atomic particle is electrically neutral? * Proton Electron Nucleus Neutron This field is required. What defines the size and shape of an atom? * The density of protons in the nucleus The cloud of negative charge formed by electrons in their orbits The number of neutrons alone The strong nuclear force This field is required. The atomic number of an element, which decides its position in the periodic table, is the number of: * Protons in the nucleus Neutrons in the nucleus Electrons plus neutrons Orbits around the nucleus This field is required. Why is the interaction of electrons between atoms important? * It produces the strong nuclear force It determines the atomic number It forms the bonds that create molecules and compounds It increases the number of protons This field is required. When a tungsten filament (as in an old bulb) is heated, what does it emit first? * Bright white visible light Infrared waves, felt as heat Radio waves X-rays This field is required. Why is copper a good conductor of electricity? * Its outer electrons are very tightly held It has no electrons in its outer layer Its protons move freely It has loosely held, free electrons in its outer layer This field is required. Which of the following is a non-conductor (insulator) of electricity? * Rubber Copper wire Metal rod Iron rod This field is required. Which two main forces affect the molecules of a substance? * Nuclear and gravitational forces Magnetic and electric forces Cohesive and kinetic forces Strong and weak forces This field is required. What is latent heat? * Heat that raises the temperature of a substance Hidden energy needed to change the state of a substance, e.g. ice to water at the same temperature Heat lost only by radiation Heat produced by friction This field is required. Heat is transmitted in which three ways? * Conduction, convection and expansion Conduction, radiation and thermionic emission Convection, radiation and evaporation Conduction, convection and radiation This field is required. Heat transfer by convection currents is seen in: * Liquids and gases Solids only A solid metal rod A vacuum only This field is required. What is thermionic emission? * Absorption of electrons by a cooled metal Creation of a potential difference by joining two metals Release of electrons from a heated material, forming a cloud of electrons (space charge) Conversion of ice into steam This field is required. Back Next Submit Quiz There was an error trying to submit your form. Please try again.Leave a ReplyYour email address will not be published. Required fields are marked *Comment * Name Email Website Δ
