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 
  
 

 

Subtopic:  Capacitance |
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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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A thin prism P1 of angle 4 ° and refractive index 1.54 ° is combined with another thin prism P2 of refractive index 1.72 to produce dispersion without deviation. The angle of P2 is
 

 

Subtopic:  Prisms |
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What will be the number of photons emitted per second by a 10 W sodium vapour lamp assuming that 90% of the consumed energy is converted into light [Wavelength of sodium light is 590 nm, and h = 6.63×10-34 J –s]
 

 

Subtopic:  Photoelectric Effect: Experiment |
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200 MeV of energy may be obtained per fission of U235. A reactor is generating 1000 kW of power. The rate of nuclear fission in the reaction is
 

 

Subtopic:  Nuclear Energy |
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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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Two tangent galvanometer having coils of the same radius are connected in series. A current flowing in them produces deflection of 60 ° and 45 ° respectively. The ratio of the number of turns in the coils is
 

 

Subtopic:  Moving Coil Galvanometer |
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