A. 40 W bulb
B. 60 W blub
C. 100 W blub
D. all will burn equally brightly
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Related Mcqs:
- There are three bulbs of 60W 100W and 200W which bulb has thickest filament ?
A. 100W
B. 200W
C. 60W
D. all - A 10Ω electric heater is connected to a 220V 50Hz mains supply. What is the peak value of the potential difference across the heater element ?
A. 220V
B. 220/ 2V
C. 110V
D. 220 √2V - Three equal resistors connected in series with a source of e m f together dissipate 10 W of power each. What will be the power dissipated if the same resistors are connected in parallel across the same source of e m f ?
A. 40 W
B. 90W
C. 100W
D. 120W - n an LCR series circuit, if V is the effective value of the applied voltage VR is the voltage across R VL is the effective voltage across L & Vc is the effective voltage across C then_______________?
IA. V = VR+VL+VC
B. V2 = VR2+VL2+VC2
C. V2 = VR2+(VL-VC)2
D. V2 = VL2+(VR-VC)2 - 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 - Which one of the following bulbs has the least resistance ?
A. 100 watt
B. 200 watt
C. 300 watt
D. 60 watt - When a pure inductor of inductance L and a pure capacitor of capacitance C are connected in parallel to a sinusoidal potential difference V the potential difference across both L & C will be_______________?
A. Same
B. Different
C. At L will be more than at C
D. At L will be less than at C - Which one of the following materials is useful for making bulb filaments ?
A. constantan
B. nichrome
C. copper
D. tungsten - How much heat does a 40 W bulb generates in one hour ?
A. 144000J
B. 144J
C. 1.44J
D. 14J - 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
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