249
Q:

Two electric bulbs marked 25W – 220V and 100W – 220V are connected in series to a 440Vsupply. Which of the bulbs will fuse?

A) 25 W B) Both
C) 100 W D) Neither

Answer:   A) 25 W



Explanation:

Resistances of both the bulbs are

 

R1=V^2/P1 = 220^2/25

 

R2 = V^2/P2 = 220^2/100

 

Hence  R1gt ; R2

 

When connected in series, the voltages divide in them in the ratio of their resistances. The voltage of 440 V devides in such a way that voltage across 25 w bulb will be more than 220 V. Hence 25 w bulb will fuse.

Subject: Physics
Exam Prep: AIEEE
Q:

0 deg K is equivalent to

A) 273 deg C B) -273 deg C
C) 0 deg C D) 100 deg C
 
Answer & Explanation Answer: B) -273 deg C

Explanation:
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0 69
Q:

The component used for tuning a radio is basically a variable ___.

A) Resistor B) Condenser
C) Inductor D) Transformer
 
Answer & Explanation Answer: B) Condenser

Explanation:
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Exam Prep: AIEEE , Bank Exams

0 53
Q:

The Beaufort scale is used to measure

A) Atmospheric pressure B) Altitudes of mountains
C) Wind velocity D) Intensity of earthquakes
 
Answer & Explanation Answer: C) Wind velocity

Explanation:
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0 54
Q:

What is the name of the phenomena (driven by the scattering of light) in which mountain tops acquire a rosy or orange hue around sunrise and sunset?

 

A) Brillouin scattering   B) Circle of confusion  
C) Alpenglow   D) Barrel distortion  
 
Answer & Explanation Answer: C) Alpenglow  

Explanation:
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1 200
Q:

What is the name of the phenomena in physics and astronomy which involves the splitting of a spectral line into two or morecomponents of slightly different frequency when the light source is placed in a magnetic field?

 

A) Lumen Effect   B) Alpenglow Effect  
C) Zeeman Effect   D) Raman Effect  
 
Answer & Explanation Answer: C) Zeeman Effect  

Explanation:
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Filed Under: Physics
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2 149
Q:

The product of mass and velocity is called:

 

A) Potential energy B) Momentum
C) Force D) Kinetic energy
 
Answer & Explanation Answer: B) Momentum

Explanation:
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Filed Under: Physics
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1 1229
Q:

Complete the following.
1 kwh = ..........?

 

A) 36 × 10-6 J B) 3.6 × 10-6 J
C) 3.6 × 106 J D) 36 × 106 J
 
Answer & Explanation Answer: C) 3.6 × 106 J

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0 1194
Q:

A body is falling from a height of 200 m. After it has fallen 100 m, the body will possess:

 

A) less kinetic energy and more potential energy. B) Zero potential energy and half Kinetic energy
C) more kinetic energy and less potential energy. D) half potential energy and half kinetic energy.
 
Answer & Explanation Answer: D) half potential energy and half kinetic energy.

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1 179