QUESTION PAPER-1

1)_______ are materials in which electric charges do not move easily.A)InsulatorsB)ConductorsC)CircuitsD)Metals2)_____ can prevent damage caused to buildings by lightning strikes.A)InsulatingB)ConductingC)GroundingD)Charging3) The measure of how difficult it is for electrons to flow in an object is called the _______.A)electric circuitB)electric resistanceC)magnetic domainD)electric field4) When a portable radio is playing, the current in the radio is 0.3 A. If the resistance of the radio is 30.0 Ohm, what is the voltage supplied by the radio battery?A)12 VB)9 VC)6 VD)15 V5) _______ is a measure of the amount of electrical energy transferred by an electric charge as it moves from one point to another in a circuit.A)CurrentB)ChargeC)Electric circuitD)Voltage6)A(n) _______ is made of a current-carrying wire wrapped around an iron core.A)electric currentB)insulatorC)conductorD)electromagnet7) What is the unit of charge?A) CoulombB) Newton.C) Watt8)Which of the following does not describe the magnetic force between two magnets?A)The like poles attract.B)The like poles repel.C)It decreases as the magnets move apart.D)The unlike poles attract.9)The unit of electrical resistance is theA) joule.B) ampere.C) ohm.D) watt.10)In a flashlight two 1.5 volt batteries are connected in series. The result isA) an equivalent voltage of 1.5 volts, but more current will flow.B) an equivalent voltage of 3 volts.C) that no current will flow.

11)What is an electromagnet?A) A magnet that makes electricityB) a magnet made of coiled wire that works when electricity runs through itC) a permanent magnet that is made using electricity

12)The type of current in a battery powered radio isA) static currentB) alternating currentC) direct currentD) potential current13)If you increase the voltage across a resistor, what happens to the current.A) As the voltage increases, the current decreases.B) The current will not change if the resistor stays the same.C) As the voltage increases, the current increases.

14)One kilowatt hour of electrical energy is the same asA) 36 x 105 wattsB) 36 x 10s ergsC) 36 x 105 joulesD) 36 x 105 B.T.U.15)An electric current of 5 A is same asA) 5 J / CB) 5 V / CC) 5 C / secD) 5 w / sec.16)Which of the following quantities can be measured in the unit of kilowatt hour?A) PowerB) Electrical energyC) Fuse ratingD) Power rating17)Which of the following bulbs will have the least resistance ?A) 220 V, 60 WB) 220 V, 100 WC) 115 V, 60 WD) 115 V, 100 W.18)The resistance of a 100 W, 200 V lamp isA) 100 ohmB) 200 ohmC) 400 ohmD) 1600 ohm.19)The instrument used for measuring electric current is : A)ammeterB)galvanometer C)voltmeter D)potentiometer 20)In which device is a permanent magnet used?A) electric bellB)electromagnetC)plotting compassD)relayE)transformer21)A coil of copper wire wrapped around a core could be used as an electromagnet. Which of the following combinations would produce the strongest electromagnet?Number of turns CoreA) few soft-ironB) few steelC) many copperD) many soft-ironE) many steel22)A transformer which is 80% efficient gives an output of 12V and 4A. What is the input power?A) 13WB) 38WC) 60WD) 154W23)Why is electrical energy usually transmitted at high voltage?A) the resistance of the transmission cables is as small as possibleB) the transmission cables are safer to handleC) as little energy as possible is wasted in the transmission cablesD) the transmission system does not require transformersE) the current in the transmission cables is as large as possible24)The potential difference required to pass a current 0.2 A in a wire of resistance 20W is ____.

A)100 VB)4 VC).01 VD)40 V25)The work done in moving a unit positive charge across two points in an electric circuit is a measure of ___________.

A)currentB)potential differenceC)resistanceD)power26)When there is an electric current passing through a wire, the particles moving are _________.

A)electronsB)protonsC)atomsD)ions27)When a fuse is rated 8 A, it means _____________.

A)it will not work if current is less than 8 AB)it has a resistance of 8 WC)it will work only if current is 8 AD)it will melt if current exceeds 8 A28)Which of the following is a conductorA)GlassB)woodC)TungstenD) Plastic29)Which of the following is the best conductor for electricity?A) Distilled water B) Salt waterC) Tap waterD) Rain water30)Filaments of electric bulbs are usually made ofA) NichromeB) TungstenC) CopperD) Carbon. Training on Hamradio | Chennai-100 20/07/13