Olympiad – Class X – Science - Phy - Electricity

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Question - 1

What is meant by 5 A?

  • A A charge of 5 C flows through a point in 1 second
  • B 5 V electricity flows across 1Q of resistance
  • C 5 V electricity is causing 1C of charge to flow
  • D A charge of 5 C flows through a point in 5 seconds

Question - 2

What is the charge flowing through a resistor R in 4 s? 

  • A 3C
  • B 6C
  • C 12C
  • D 18C

Question - 3

What is potential difference across e 2 Q resistor in the circuit shown below?

  • A 1 V
  • B 2 V
  • C 6 V
  • D 12 V

Question - 4

A 10 Q resistance wire AB of length 2 m is connected in a circuit as shown below.

What is the reading on the voltmeter when the jockey is at point C?

  • A 1.6V
  • B 2.4 V
  • C 9.6 V
  • D 12 V

Question - 5

When the temperature of a pure metallic conductor is increased, then what happens to its resistance?

  • A It decreases
  • B It increases
  • C It may increase or decrease
  • D It remains the same

Question - 6

What is the effective resistance of the four resistors in the circuit shown below?

  • A 1.5\(\Omega \)
  • B 8.0\(\Omega \)
  • C 8.2\(\Omega \)
  • D 3.3\(\Omega \)

Question - 7

The resistance of a metal wire of length 2 m is 40 Qat 20°C. If the diameter of the metal at that temperature?

  • A 1.28x 10-8\(\Omega \)m
  • B 1.57x 10-8\(\Omega \)m
  • C 1.75 x 10-9 \(\Omega \)m
  • D 1.88x 10-8\(\Omega \)m

Question - 8

An electric fan rated 50 W operates 20 hours in a day. What is the cost of the energy to operate it for 30 days at Rs.2 per kWh?

  • A Rs.50 
  • B Rs.60
  • C Rs.70
  • D Rs.80

Question - 9

What is the effective resistance between points P and Q in the circuit shown below?

 

  • A 0.15\(\Omega \)
  • B 0.66\(\Omega \)
  • C 1.5\(\Omega \)
  • D 1.75\(\Omega \)

Question - 10

Two resistors of 4 Q and 6 Q are connected in parallel with a 6 V battery of negligible resistance. Calculate the current flowing through the battery

  • A 1 A
  • B 2 A
  • C 1.5 A
  • D 2.5 A