Home
Class 12
PHYSICS
A transformer is used to light a 100 W a...

A transformer is used to light a `100 W` and `110 V` lamp from a `220V` mains. If the main current is `0.5 A`, the Efficiency of the transformer is approximately:

A

`30%`

B

`50%`

C

`90%`

D

`10%`

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • NTA JEE MOCK TEST 62

    NTA MOCK TESTS|Exercise PHYSICS|25 Videos
  • NTA JEE MOCK TEST 64

    NTA MOCK TESTS|Exercise PHYSICS|25 Videos

Similar Questions

Explore conceptually related problems

A transformer is used to light a 140 W, 24 V lamp from 240 V AC mains. The current in mains cable is 0.7 A, find the efficiency of transformer.

NTA MOCK TESTS-NTA JEE MOCK TEST 63-PHYSICS
  1. A small block of mass m slides along a smooth frictional track as show...

    Text Solution

    |

  2. The length of the potentiometer wire is 600 cm and a current of 40 mA ...

    Text Solution

    |

  3. A transformer is used to light a 100 W and 110 V lamp from a 220V main...

    Text Solution

    |

  4. A point charge q is placed inside a conducting spherical shell of inne...

    Text Solution

    |

  5. A body is moving from rest under constant acceleration and let S1 be t...

    Text Solution

    |

  6. A body hanging from a massless spring stretches it by 3 cm on earth's ...

    Text Solution

    |

  7. A black body of mass 34.38 g and surface area 19.2cm^(2) is at an inti...

    Text Solution

    |

  8. During an adiabatic process, the pressure of a gas is found to be prop...

    Text Solution

    |

  9. A circular coil of radius R carries a current i. The magnetic field at...

    Text Solution

    |

  10. The masses m(1) m(2) and m(3) of the three bodies shown in fig . Are 5...

    Text Solution

    |

  11. Calculate the binding energy per nucleon of .(20)^(40)Ca. Given that ...

    Text Solution

    |

  12. A particle is subjected simultaneously to two SHMs, one along the x - ...

    Text Solution

    |

  13. If the work functions of three photosensitive materials are 1 eV, 2 eV...

    Text Solution

    |

  14. A uniform rod of length 2.0 m specific gravity 0.5 and mass 2 kg is hi...

    Text Solution

    |

  15. A fish looking up through the water sees the outside world contained i...

    Text Solution

    |

  16. A uniform circular disc of radius r placed on a rough horizontal plane...

    Text Solution

    |

  17. Heat energy is incident on the surface at the rate of 1000 J/min. If c...

    Text Solution

    |

  18. Dimensions of ohm are same as that of (where h is Planck's constant an...

    Text Solution

    |

  19. A shell bursts on contact with the gorund and pieces from it fly in al...

    Text Solution

    |

  20. For the circuit shown below, the current (in mA) through the Zener dio...

    Text Solution

    |