Q1. In a series circuit,
(a) There are multiple paths for current
(b) All bulbs stop glowing together.
(c) Any number of bulbs can be added without affecting the glow of each bulb.
(d) The home appliances are generally connected.
Q2. In an electric bell, when the switch is turned on
(a) The electromagnet attracts the metal arm.
(b) The metal arm hits the gong.
(c) Both (a) and (b)
(d) None of these
Q3. The principle behind a lightning conductor is that
(a) It offers a low-resistance path of the ground for the charges.
(b) It offers a high resistance path to the charges.
(c) It uses a resistor to avoid movement of charges.
(d) Both (a) and (b)
Q4. An electric fuse should have
(a) Low melting point so that is melts when excessive current through it.
(b) High melting point so that is should not melt and allow the current to pass.
(c) Los resistance sot that is allows maximum current to pass.
(d) Both (a) and (b)
Q5. Which is the surest test to find whether a material is a magnet?
(a) Attraction
(b) Repulsion
(c) Both (a) and (b)
(d) Density of the substance
Q6. An electromagnet is
(a) Used in an electric bell.
(b) A permanent magnet.
(c) Dependent on passages of electric current.
(d) Both (a) and (b)
Q7. A lightning conductor consists of
(a) A pointed metal with high resistance.
(b) A pointed metal with low resistance.
(c) A non-metal with high resistance.
(d) A non-metal with low resistance.
Q8. A voltmeter is used to measure ______________ and is always connected in _______________ .
(a) Voltage, parallel
(b) Current, parallel
(c) Current, series
(d) Voltage, series
Q9. The electrical appliances that we use are
(a) Conductors offering zero resistance.
(b) Conductor offering some resistance.
(c) Conductors offering resistance dependent on the appliance.
(d) Conductors offering maximum resistance.
Q10. The appliances that are connected with each other in a circuit but still working independently of each other show that
(a) All appliances are connected in series.
(b) All appliances are connected in parallel.
(c) Each appliance has a separate circuit of its own.
(d) The appliance has different voltage.
S1. Ans.(b)
Sol.
S2. Ans.(c)
Sol.
S3. Ans.(a)
Sol. The lightning conductor provides a very low resistance path between the top of the lightning conductor rod via a substantial strip of metal to the ground so that the current as a result of a lightning strike does not flow through the building to which it is attached.
S4. Ans.(a)
Sol. The material used for fuse elements must be of low melting point, low ohmic loss, high conductivity (or low resistivity), low cost and free from detraction.
S5. Ans.(b)
Sol. Repulsion is the surest test of the magnets, because a magnetic substance also has attractive property.
S6. Ans.(d)
Sol.
S7. Ans.(b)
Sol.
S8. Ans.(a)
Sol. A voltmeter is connected in parallel with a device to measure its voltage.
S9. Ans.(c)
Sol.
S10. Ans.(b)
Sol.
