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4561

Which of the arrangements of radiations below shows decreasing order of wavelengths?   

  • A.   X-rays> radio waves > infrared radiations     
  • B. Radio waves> infrared radiations > X-rays     
  • C. Infrared radiations > radio waves > X-rays   
  • D.  X-rays> infrared radiations > radio waves
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4562

An electric pressing iron is connected to the mains using an insulated wire. wire becomes very hot.

The heat generated in the wire can be minimized by replacing the wire with one of?

 

  • A.  thinner insulation.     
  • B.  greater diameter.      
  • C. smaller diameter.       
  • D. thicker insulation.
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4563

 

 

 

In the diagram above, a bulb is lit by drawing 2.0A from 440V a.c. source.  Calculate the cost of keeping the bulb on for two days at $0.40 per kilowatt -hour . - SchoolNGR

 

In the diagram above, a bulb is lit by drawing 2.0A from 440V a.c. source. Calculate the cost of keeping the bulb on for two days at $0.40 per kilowatt-hour .                 

 

  • A.   $16.90               
  • B.   $84.48             
  • C. $1690.00     
  • D.   $8.48
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4564

A wire of cross-sectional area 2π *  10\(^-{8}\) m\(2\) and resistivity 1.1 x 10\(^-{8}\) Ω m, has a resistance of 21Ω.

Calculate the length of the wire. [π=22/7]     

  • A. 180 m     
  • B. 140 m   
  • C.  120 m   
  • D.  240 m
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4565

Which of the following statements best describes the particles in a solid at room temperature? They are    

  • A.  far apart and moving randomly.     
  • B. close together and vibrating.   
  • C.  close together and stationary.      
  • D. close together and moving randomly.
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