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Nursing Question Bank

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1265 available questions

Physics · Question 361

The Doppler effect is commonly observed as an apparent change in the frequency of:

  1. Sound waves due to relative motion
  2. A stationary direct current
  3. The mass of a body
  4. The charge on an electron
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Correct answer: A

Sound waves due to relative motion

Relative motion between a wave source and observer produces an apparent frequency shift.

Physics · Question 362

Periodic alternation between maximum and minimum sound intensity caused by two nearby frequencies is called:

  1. Resonance
  2. Beats
  3. Refraction
  4. Polarisation
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Correct answer: B

Beats

Superposition of two waves with slightly different frequencies produces beats.

Physics · Question 363

One weber per ampere is equal to one:

  1. Tesla
  2. Henry
  3. Farad
  4. Ohm
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Correct answer: B

Henry

Inductance is magnetic flux linkage per current, and its SI unit is the henry.

Physics · Question 364

One tesla is equal to how many gauss?

  1. 10
  2. 100
  3. 1,000
  4. 10,000
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Correct answer: D

10,000

One tesla equals 10^4 gauss.

Physics · Question 365

What are the dimensions of Planck's constant?

  1. MLT^-1
  2. ML^2T^-1
  3. ML^2T^-2
  4. M^-1L^2T
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Correct answer: B

ML^2T^-1

Planck's constant has the dimensions of energy multiplied by time: ML^2T^-1.

Physics · Question 366

The continuity equation for a steadily flowing fluid expresses conservation of:

  1. Charge
  2. Mass
  3. Angular momentum only
  4. Temperature
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Correct answer: B

Mass

The mass flow rate remains constant along a stream tube in steady flow.

Physics · Question 367

Force is equal to the rate of change of:

  1. Velocity only
  2. Kinetic energy
  3. Momentum
  4. Displacement
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Correct answer: C

Momentum

Newton's second law in general form is F = dp/dt.

Physics · Question 368

Which SI unit may be used for torsional rigidity, or torque per unit angular twist?

  1. N m rad^-1
  2. N m^-2
  3. N s
  4. J s^-1
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Correct answer: A

N m rad^-1

Torsional rigidity is torque divided by angular twist, giving N m per radian.

Physics · Question 369

What is the energy stored in an inductor of inductance L carrying current I?

  1. LI
  2. LI^2
  3. 1/2 LI^2
  4. 2LI^2
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Correct answer: C

1/2 LI^2

The magnetic energy stored in an inductor is U = 1/2 LI^2.

Physics · Question 370

After a freely falling object reaches terminal velocity, its acceleration is:

  1. g
  2. Zero
  3. Increasing
  4. Equal to its velocity
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Correct answer: B

Zero

At terminal velocity drag balances weight, so net force and acceleration are zero.