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1009 available questions

Physics · Question 481

Ten complete waves pass through a point in 2 seconds. If the wavelenght is 20cm, what is the speed of the wave?

  1. 1 m/s
  2. 10 cm/s
  3. 2 m/s
  4. 40 cm/s
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Correct answer: A

1 m/s

Physics · Question 482

The shortest possible wavelength Is

  1. Lyman series
  2. Balmer series
  3. Paschen series
  4. Brackett series
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Correct answer: A

Lyman series

Physics · Question 483

n physics it is observed that when matter and anti-matter combine, they form:

  1. Particles with zero charge
  2. Particles with positive charge
  3. Particles with negative charge
  4. Particles with Dual mass
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Correct answer: A

Particles with zero charge

Physics · Question 484

If an object is undergoing an orbital motion around another object it is called

  1. Revolution
  2. Rotation
  3. Both of them
  4. None of them
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Correct answer: A

Revolution

Physics · Question 485

An electron will have maximum kinetic energy when it has:

  1. Long wavelength
  2. Short wavelength
  3. Low frequency
  4. Circular motion
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Correct answer: B

Short wavelength

Physics · Question 486

The velocity of a wave is v, its time period is T and { is its frequency. Then the correct equation for frequency is:

  1. T=vf
  2. lf=v+T
  3. 1f=1/T
  4. T=v/T
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Correct answer: C

1f=1/T

Physics · Question 487

The half-life of a radio-active sample 108. Which one is not the unit of radio-activity? predicts about:

  1. Whole life of sample
  2. Disintegration time of half number of atoms
  3. Decay only
  4. Total time for stable atoms
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Correct answer: B

Disintegration time of half number of atoms

Physics · Question 488

In a lamp load when more than one lamp are switched on the total resistance of the load

  1. Increases
  2. Decreases
  3. Remains same
  4. None of the above
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Correct answer: B

Decreases

Physics · Question 489

The frequency of a stirng on a musical instrument can be change either by:

  1. varying the diameter or by changing the length
  2. varying the tension or by changing the thickness
  3. varying the tension or by changing the length
  4. vaying the thickenss or by changing the length
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Correct answer: C

varying the tension or by changing the length

Physics · Question 490

A body covers displacement of 10m towards North and returns back to initial point by covering 10m towards South, its total displacement is:

  1. 20m North
  2. 10m South
  3. 0m along North-South
  4. 0m
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Correct answer: C

0m along North-South