CTR 1 What is the correct way to connect the battery to the light bulb to make it light up A B C D hollow metal insulator metal E None of these will work CTR 2 The instructor goes crazy and grabs the terminals of a fully charged 12V battery He will A immediately be killed B not be killed but he will start hollering because it really hurts C not feel anything This action is harmless CTR 3 Which graph of voltage vs current shows the behavior of an ohmic resistor a resistor obeying Ohm s Law V V A I V B I V C I E None of these D I CTR 4 Two cylindrical resistors are made of the same material same resistivity Resistor 2 is twice as long and has twice the diameter of resistor 1 What is the ratio 1 R2 R1 2 A 2 B 4 C 1 2 D 1 4 E 1 The arrow shows the direction of current flow CTR 5 A battery with emf or voltage V is attached to a resistor of resistance R The circuit diagram is shown below The point A is at zero volts B C V 5V R 10 A D The correct voltages at the points B C and D are A VB 0V VC 5V VD 0V B VB 5V VC 5V VD 0V C VB 5V VC 5V VD 0V D VB 5V VC 5V VD 0V E None of these CTR 6 Two light bulbs are connected to a battery in series in a chain one after another How does the current in upper light bulb A compare to the current in lower light bulb B A IA IB B IA IB C IA IB D answer depends on relative size o Ibat RA IA RB IB V CTR 7 A light bulb is attached to a battery with constant voltage V The light filament has resistance R The circuit diagram is shown below When the light bulb is first turned on by attaching to the battery the filament heats rapidly and as it heats its resistance R increases due to increased scattering of electrons by thermal vibrations V 5V I R As the light bulb filament heats up the current I in the filament A increases B decreases C stays the same CTR 8 A 60W light bulb and a 100W light bulb each has a filament with a certain resistance when the bulb is on and hot How do the resistances of the filaments compare A R60W R100W B R60W R100W C R60W R100W D Impossible to tell without further information Hint When a light bulb is plugged in it is essentially attached to a battery with constant voltage CTR 9 Two light bulbs A and B are in series so they carry the same current Light bulb A is brighter than B Which bulb has higher resistance HINT brighter means more power A A V B B C Same resistance A B CTR 10 Please answer now The voltage provided by your household wall sockets is A AC voltage B DC voltage C Depends on the appliance which you plug into the socket Answer B has lower resistance A has higher resistance Both bulbs have the same current I According to P I2R if the currents are the same the bulb with the larger R will have the larger power P
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