SUMMATIVE ASSESSMENT –I SCIENCE Class – X Time allowed: 3 hours Maximum Marks: 90 General Instructions: (i) All questions are compulsory. (ii) The question paper comprises of two sections‚ A and B. You are to attempt both the sections. (iii) Questions 1 to 4 in section A are one mark questions. These are to be answered in one word or in one sentence. (iv) Questions 5 to 11 in section A are two marks questions. These are to be answered in about 30 words each. Questions 12 to 23 in section A are three
Premium Chemical reaction Chemistry Magnetic field
proving that rotary mechanical power can be converted into electric power. The race for a practical generator begins. • Faraday’s disk 1832-1860 Various generator schemes are tried‚ mostly employing permanent magnets to create the necessary magnetic field. Ampère and Pixii make the first hand-cranked version (1832); C.G. Page proposed a reciprocating analogue of the steam engine (1850); and H. Wilde made the commercially successful Alliance generator (1866) for powering arc lamps in lighthouses
Premium Electromagnetism Electricity Magnetic field
wattmeter is used to measure (Useful) power taken from ac power supplies. The electrodynamic wattmeter uses the reaction between the magnetic fields of two current-carrying coils‚ one fixed and the other movable. The voltage and current coils are wound around a laminated iron core to produce a magnetic field across the air gap. When the current through the fixed-position field windings is the same as current through the load and the current through the moving coil is proportional to the load voltage‚ then
Free Magnetic field Alternating current
passing an electrical current through a magnetic field creates a force. In an MHD propulsion system‚ a magnetic field is created within the hull‚ and sea water is used to conduct the electric current‚ as shown in the illustrations accompanying this story. The underlying principle is known as Fleming’s Left-Hand Rule‚ which is demonstrated by taking the thumb‚ index‚ and middle finger of the left hand and holding them perpendicular to each other. If a magnetic field is created in the direction of the index
Premium Magnetic field Battery Electric current
MINISTRY OF EDUCATION FIJI SEVENTH FORM EXAMINATION – 2004 EXAMINER’S REPORT PHYSICS GENERAL COMMENTS PAPER I The format for 2004 FSF Physics Examination paper has been similar to 2003 . The examination paper on the whole had tested knowledge and concepts expected to be learned by seventh form physics students in Fiji‚ particularly : - familiarity with basic concepts ; - problem solving techniques ; - knowledge of practical situations encountered during practical lessons
Premium Magnetic field Question Answer
h 6.6 1034 J s o 4 107 T ma -1 K B 1.38 1023 J K -1 N A 6.023 1023 /mole mn 1.6 1027 kg Q1. Define the electric dipole moment. What is the direction of this vector? (1) Q2. What is the SI unit of electric flux and electric field? (1) Q3. The number of turns in the secondary of a transformer is 100 times the number of turns in the primary. If 1kW of power is supplied to the primary‚ how much power is obtained at the secondary? (1) Q4. Arrange these in decreasing order of
Free Magnetic field Magnetism Wavelength
A.C. P7 Describe the properties and an application of two different magnetic materials commonly used in electrical and electronic engineering Task 1 By research and investigation; a) Identify and name two magnetic materials used in electrical engineering b) Give an application of each of the two materials c) Define two of the magnetic properties terms listed below: B-H curve*‚ retentivity (a.k.a. remanence)‚ coercivity (a.k.a. coercive force)‚ hysteresis‚ absolute permeability*‚ relative
Free Magnetic field Alternating current Electromagnetism
rota ling screws. Since the di d magnetic f should be pl IEMS lvanometer eter: the principle h other in w component o n is produce t at the cent unted on the n conducting another. On r end of all a ated about a rection of th field due to aced along N Tangen S ‐ High Scho (Pivoted Typ e of tangents which a magn of magnetic d by passing tre of the co e spindle is k g circular coi ne end of all are connecte vertical axis he magnetic the circular N‐S direction nt Galvan
Free Magnetic field Magnetism Magnet
"echolocation‚" but bats aren’t the only animals that use echolocation. Dolphins also use echolocation to navigate themselves in murky water. Sharks were also discussed in class. Sharks have special cells in their brains that are sensitive to the electrical fields other creatures generate. This ability is so refined in some sharks that they can find fish hiding under sand by the weak electric signals their twitching muscles emit. They pick any electrical signal around them and even the weakest of electrical
Premium Sense Olfaction Perception
“Meissner effect” was discovered. It told of a magnet moving by a conductor by electrical currents in a conductor. This effect is the basis for conventional generators. However‚ superconductors the magnet is repulsed. The current is mirrored through the field that would have been penetrated. This is called magnetism and causes magnet to be levitated above superconductor material. In 1989‚ the Illinois Superconductor was the first to commercialize “high temperature” superconductors. They introduced medical
Premium Superconductivity Magnetic field Electric current