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1009 available questions

Physics · Question 491

Electric power is:

  1. rate of electric work done per unit time
  2. voltage per unit time
  3. electric charge per unit time
  4. current per unit time
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Correct answer: A

rate of electric work done per unit time

Physics · Question 492

When AC is converted to DC, the process is called:

  1. Magnification
  2. Amplification
  3. Rectification
  4. Resolution
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Correct answer: C

Rectification

Physics · Question 493

In a stationary wave , the distance between a node and consecutive anitnode is:

  1. A quarter of wavelength
  2. 3/4 of wavelength
  3. One wavelength
  4. Half of wavelength
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Correct answer: A

A quarter of wavelength

Physics · Question 494

The source of x-rays generation is

  1. Cu
  2. H
  3. Na
  4. AI
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Correct answer: A

Cu

Physics · Question 495

Radioactivity does not depend upon:

  1. Initial number of atoms
  2. Temperature
  3. Nature of material
  4. Time
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Correct answer: B

Temperature

Physics · Question 496

A conductor has length equal to n meters and radius r meters. Its resistance will be equal to:

  1. R = pr-1
  2. R = pr-2
  3. R = pr-3
  4. R = pr-4
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Correct answer: B

R = pr-2

Physics · Question 497

Output current of a half wave rectifier is:

  1. AC current
  2. Unidirectional current
  3. Zero always
  4. Straight line parallel to vertical axis
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Correct answer: B

Unidirectional current

Physics · Question 498

Which of the following are component of half wave rectifier?

  1. Transformer
  2. Load resistance
  3. Power supply
  4. All of the above
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Correct answer: D

All of the above

Physics · Question 499

Magnetic force between two wires which are having current in opposite direction will:

  1. attract each other
  2. repel each other
  3. experience no force between them
  4. none of these
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Correct answer: B

repel each other

Physics · Question 500

If displacement = 15 m and time t=10 seconds , then average velocity is

  1. 12.5 m/s
  2. 1.5 m/s
  3. 2.5 m/s
  4. 3 m/s
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Correct answer: B

1.5 m/s