In Young’s double-slit experiment carried out with wavelength λ=5000Å, the distance between the slits is 0.2 mm and the screen is 2 m away from the slits. The central maxima is at n = 0. The third maxima will be at a distance x (from central maxima) is equal to:
1.  5.0 cm
2.  0.5 cm
3.  4.67 cm
4.  1.5 cm

Subtopic:  Young's Double Slit Experiment |
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A gang capacitor is formed by interlocking a number of plates as shown in figure. The distance between the consecutive plates is 0.885 cm and the overlapping area of the plates is 5 cm2. The capacity of the unit is 
  
 

 


The freezer in a refrigerator is located at the top section so that
 

1.  the entire chamber of the refrigerator is cooled quickly due to convection
2.  the motor is not heated
3.  the heat gained from the environment is high
4.  the heat gained from the environment is low

Subtopic:  Convection |
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A choke is preferred to a resistance for limiting current in AC circuit because
 

1.  choke is cheap
2.  there is no wastage of power
3.  choke is compact in size
4.  choke is a good absorber of heat

Subtopic:  Transformer |
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As shown in the figure a magnet is moved with a fast speed towards a coil at rest. Due to this induced emf, induced current and induced charge in the coil is EI and Q respectively. If the speed of the magnet is doubled, the incorrect statement is-
1.  E increases
2.  I increases
3.  Q remains same
4.  Q decreases

 

Subtopic:  Faraday's Law & Lenz Law |
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Which one of the following is not made of soft iron?
 

1.  Electromagnet
2.  Core of transformer
3.  Core of dynamo
4.  Magnet of loudspeaker

Subtopic:  Magnetic Materials |
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