Home
Class 12
PHYSICS
Statement-I: The power delivered to a li...

Statement-I: The power delivered to a light bulb is more just after it is switched ON and the glow of the filament is increasing as compared to when the bulb is glowing steadily, i.e. after sometime of switching ON. Statement-II: As temperature decreases, resistance of conductor increases

A

If both Statement- I and Statement- II are true, and Statement - II is the correct explanation of Statement– I.

B

If both Statement - I and Statement-II are true but Statement - II is not the correct explanation of Statement – I.

C

If Statement-I is true but Statement-II is false

D

If Statement-I is false but Statement-II is true.

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    MOTION|Exercise EXERCISE -3 SECTION -B (PREVIOUS YEAR PROBLEMS JEE MAIN)|42 Videos

  • CURRENT ELECTRICITY

    MOTION|Exercise EXAMPLE|79 Videos

  • CURRENT ELECTRICITY

    MOTION|Exercise EXERCISE -2 (OBJECTIVE PROBLEMS NEET)|41 Videos

  • CONSTRAINED MOTION

    MOTION|Exercise EXAMPLES|12 Videos

  • ELASTICITY

    MOTION|Exercise EXERCISE -3|60 Videos

Similar Questions

Explore conceptually related problems

When is more power delivered to a light bulb, just after it is turned on and the glow of the filament is increasing or after it has been ON for a few seconds and the glow is steady?

(a) what is the rate at which energy being delivered to a light bulb higher : just after it is turned on , the glow of the filament is increasing , or after it has been on for a few seconds and the glow is steady ? (b) IF a piece of wire is used to connect points b and c in Fig. 7.9, does the brightness of bulb R_(1) increase , decrease or stay constant ? What happens to the brightness of bulb R_(2) ? (I_(1) = I_(2) = I) (c) Compare the brightness of four identical light bulbs in Fig. 7.10 . What happens if the bulb A fails so that it cannot conduct ? What if C fails ? What if D fails? (d) If electric power is transmitted over long distances, the resistance of the wires becomes significant. Why ? Which mode of transmission would result in less energy losss: high current and low voltage or low current and high voltage ? Discuss. (e) In Fig. 7.11 , describe wha happens to the light bulb after the switch is closed . Assume the capacitor has a large capacitance and is initially uncharged. (f) Astuident claims that a second light bulb in series is less bright than the first , because the first bulb uses up some of the current . How would you respond to this statement ? (g) If you were to design an electeric heater using nichrome wire as the heating element , what parameters of the wire would you vary to meet a specific power output , sch as 1000 W ?

Statement-1: Knowing that rating is done at steady state of the filament, an electric bulb connected to a source having rated voltage consumes more than rated power just after it is switched on. Statement-2: When filament is at room temperature its resistance is less than its resistance is less than its resistance when the bulb is fully illuminated

The two electric bulbs of same power are connected in parallel circuit. If one bulb is glowing and then another bulb is switched on, then brightness of the first bulb increases, decreases or remians unchanged. Expalin.

Two electric bulbs of 50 W and 100 W are given. When they are (i) connected in series (ii) connected in parallel, which bulb will glow more ?

MOTION-CURRENT ELECTRICITY-EXERCISE -3 SECTION -A (PREVIOUS YEAR PROBLEMS NEET)
  1. A steady current is set up in a metalic wire of non- uniform cross-sec...

    Text Solution

    |

  2. Seven resistance are connected as shown in the firgure. The equivalent...

    Text Solution

    |

  3. Statement-I: The power delivered to a light bulb is more just after it...

    Text Solution

    |

  4. A student measures the terminal potential difference (V) of a cell (of...

    Text Solution

    |

  5. If voltage across a bulb rated 220 V – 100 W drops by 2.5% of its rate...

    Text Solution

    |

  6. The power dissipated in the circuit shown in the figure is 30 W. The v...

    Text Solution

    |

  7. A ring is made of a wire having a resistance R(0) = 12 Omega. Find the...

    Text Solution

    |

  8. 6Omega and 12Omega resistors are connected in parallel. This combinati...

    Text Solution

    |

  9. Charge passing through a conductor of cross-section area A=0.3 m^2 is...

    Text Solution

    |

  10. A cell having an emf E and internal resistance r is connected across a...

    Text Solution

    |

  11. In the circuit shown the cells A and B have negligible resistance. For...

    Text Solution

    |

  12. A current of 2 A flows through a 2 Omega resistor when connected acros...

    Text Solution

    |

  13. The resistance t R of a conductor varies with temperature t as shown ...

    Text Solution

    |

  14. A 100 V voltmeter of internal resistance 20 k Omega n series with a hi...

    Text Solution

    |

  15. A,B and C are voltmeters of resistance R, 1.5 R and 3R respectively as...

    Text Solution

    |

  16. A cross a metallic conductor of non-uniform cross-section, a constant ...

    Text Solution

    |

  17. The charge flowing through a resistance R varies with time t as Q = at...

    Text Solution

    |

  18. A potentiometer wire is 100 cm long hand a constant potential differen...

    Text Solution

    |

  19. The potential difference (VA – VB) between the points A and B in the g...

    Text Solution

    |

  20. A filament bulb (500 W, 100 V) is to be used in a 230 V main supply. W...

    Text Solution

    |