Physics - Electricity and Magnetism

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Question - 1

A fuse wire is made of

  • A an alloy of tin and copper
  • B an alloy of tin and lead
  • C an alloy of tin and aluminium
  • D an alloy of nickel and chromium

Question - 2

Which one of the following is used in storage batteries?

  • A Copper
  • B Lead
  • C Tin
  • D Zinc

Question - 3

In electric supply lines in India, which parameter is kept constant?

  • A Voltage
  • B Current
  • C Frequency
  • D Power

Question - 4

Conversion of chemical energy into electrical energy occur in 

  • A atomic bombs
  • B electric heaters
  • C battery
  • D dynamo

Question - 5

What is  the most commonly used substance in fluorescent tubes?

  • A Sodium oxide and argon
  • B Sodium vapour and neon
  • C Mercury vapour and argon
  • D Mercury oxide and neon

Question - 6

Increasing the charge on the plates of a capacitor means

  • A increasing the capacitance
  • B increasing the potential difference between the plates
  • C Both (a) and (b)
  • D None of the above

Question - 7

The core of a transformer is laminated so that

  • A ratio of the voltages across the secondary and primary is doubled
  • B the weight of the transformer can be kept low
  • C the rusting of the core is prevented
  • D energy loss due to eddy currents is minimised

Question - 8

Wich of the following is not correctly matched?

  • A Voltameter - potential difference
  • B Ammeter - eletriv current
  • C Potentiometer - emf
  • D Meter bridge - electrical resistance

Question - 9

Consider the following statements 

A copper voltameter measures the

1. quantity of current passing through the circuit.

2. amount of copper deposited.

3. resistance of the circuit.

Which of the statements are correct?

  • A 1, 2 and 3
  • B 1 and 2
  • C 2 and 3
  • D 1 and 3

Question - 10

Imagine a current carrying wire with the direction of current downward or into the page. The direction of magnetic field lines is

  • A clockwise
  • B anti-clockwise
  • C into the page
  • D out of the page