Which one of the following materials is useful for making bulb filaments ?

Related Mcqs:

1. There are three bulbs of 60W 100W and 200W which bulb has thickest filament ?

   A. 100W
   B. 200W
   C. 60W
   D. all

2. How much heat does a 40 W bulb generates in one hour ?

   A. 144000J
   B. 144J
   C. 1.44J
   D. 14J

3. Three bulbs are rating 40W 60W and 100W designed to work on 220V mains. Which bulb will burn most brightly if they are connected in series across 220 V mains ?

   A. 40 W bulb
   B. 60 W blub
   C. 100 W blub
   D. all will burn equally brightly

4. The consumption of energy by a 60 watt bulb in 2 sec is_________________?

   A. 120 J
   B. 60 J
   C. 30 J
   D. 0.02 J

5. If a glass plate is inserted in between the plate of a capacitor in series with a lighted bulb the brightness of the bulb________________?

   A. Remains same
   B. Brightness increases
   C. Brightness decreases
   D. No light

6. The most useful tracer is_________________?

   A. Sr-90
   B. I-131
   C. CA-41
   D. C-14

7. Which one of the following material is most suitable for making core of an electromagnet ?

   A. air
   B. steel
   C. Cu-Ni alloy
   D. soft iron

8. If a vector Ā is making an angle “∅” with positive y-axis then which of the following is correct.?

   A. Ax= ACos∅
   B. Ay= ASin∅
   C. Ay= ACos∅
   D. None

   Submitted by: Zahid Jagirani

9. Which one is the best material for making connecting wires ?

   A. iron
   B. tungsten
   C. silver
   D. copper

10. Radioactive materials can be identified by measuring their_______________?

    A. Hardness
    B. Density
    C. Mass
    D. Half life