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1009 available questions

Physics · Question 511

Two forces of F1=5 N and F2=15 N are working on a body in opposite direction. If body displaced by 5 m in direction of net force, what will be the work done by F1:

  1. 25 J
  2. -25 J
  3. 50 J
  4. 75 J
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Correct answer: B

-25 J

Physics · Question 512

Work funciton depends on:

  1. Metals only
  2. Nature of surface only
  3. Both metals and nature of surface
  4. Threshold frequencey
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Correct answer: C

Both metals and nature of surface

Physics · Question 513

Which one is not the unit of radio-activity?

  1. Bq
  2. Ci
  3. Decay/second
  4. Tesla/m2
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Correct answer: D

Tesla/m2

Physics · Question 514

A 500 W electric heater is used to heat 1 kg of water without enery losses. The specific heat capacity of water is 402 KJ kg K. What is the time take to heat the water from 25°C to 75°C?

  1. 7 seconds
  2. 42 seconds
  3. 7 minutes
  4. 420 minutes
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Correct answer: B

42 seconds

Physics · Question 515

Which expression gives the energy stored in a capacitor of capacitance C charged to potential difference V?

  1. U = CV²
  2. U = ½CV²
  3. U = Q/C
  4. U = 2QV
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Correct answer: B

U = ½CV²

The energy stored in a charged capacitor is U = ½CV². Equivalent forms are U = ½QV and U = Q²/(2C).

Physics · Question 516

Which source is assoicated with a line emission spectrum?

  1. electric signal
  2. neon street signal
  3. red traffic liht
  4. signal
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Correct answer: B

neon street signal

Physics · Question 517

The shortest wavelength of Lyman series Is (Rx = Rydberg Constant.)

  1. RH
  2. 1/RH
  3. 3RH
  4. 5/RH
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Correct answer: B

1/RH

Physics · Question 518

The interference of green photon to read photon will cause

  1. Spectrum
  2. Interference
  3. Diffracton
  4. No effect
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Correct answer: D

No effect

Physics · Question 519

Velocity of an object changes from 20 m/s to 50 m/s in 5 sec. Wht is the acceleration of the object?

  1. 6 m/s
  2. 6m/sΛ2
  3. 10 m/s
  4. 10 m/sΛ2
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Correct answer: B

6m/sΛ2

Physics · Question 520

Which one is not a vector quantity?

  1. Angular displacement
  2. impulse
  3. Moment of inertia
  4. Momentum
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Correct answer: C

Moment of inertia