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MDCAT Question Bank

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1009 available questions

Physics · Question 801

Which rectifier has the lower ripple factor?

  1. full wave
  2. half wave
  3. both A and B
  4. none of them
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Correct answer: A

full wave

The correct choice is full wave.

Physics · Question 802

A particle of charge 2e moves at 2 m/s through a magnetic field B at 45°. What is the magnetic force?

  1. 2√2 eB
  2. 4eB
  3. 2eB
  4. eB
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Correct answer: A

2√2 eB

The correct choice is 2√2 eB.

Physics · Question 803

A fixed mass of ideal gas expands isothermally as its pressure decreases. What happens to collisions with the container walls?

  1. theirmean square speeddecreases
  2. Number of collision between molecules and walls of container decreased
  3. The force of attraction between them increase
  4. Their size decreases
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Correct answer: B

Number of collision between molecules and walls of container decreased

The correct choice is Number of collision between molecules and walls of container decreased.

Physics · Question 804

Electric field lines due to a positive charge are:

  1. Always horizontal
  2. Always vertical
  3. Radially towards the charge
  4. Radially away from the charge
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Correct answer: D

Radially away from the charge

The correct choice is Radially away from the charge.

Physics · Question 805

A step-up transformer has how many turns in its secondary coil relative to its primary coil?

  1. more
  2. less
  3. equal
  4. zero
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Correct answer: A

more

The correct choice is more.

Physics · Question 806

For an ideal transformer with a fixed turns ratio and input voltage, increasing the supply frequency makes the secondary voltage:

  1. Increases
  2. Decreases
  3. Remains unchanged
  4. Any of above
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Correct answer: C

Remains unchanged

The correct choice is Remains unchanged.

Physics · Question 807

Instantaneous velocity is

  1. Always positive
  2. Always negative
  3. Positive and negative
  4. Not enough info
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Correct answer: C

Positive and negative

The correct choice is Positive and negative.

Physics · Question 808

For anticlockwise rotation, the angular-velocity vector is directed:

  1. Towards the centre
  2. Along the linear velocity
  3. Away from the centre
  4. Perpendicular to both radius and linear velocity
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Correct answer: D

Perpendicular to both radius and linear velocity

The correct choice is Perpendicular to both radius and linear velocity.

Physics · Question 809

What is the basic purpose of a filter in a rectifier circuit?

  1. Minimize variation in ac signal
  2. Suppress harmonics in rectified output
  3. Remove ripples from therectified output
  4. Stabilize dc output voltage
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Correct answer: C

Remove ripples from therectified output

The correct choice is Remove ripples from therectified output.

Physics · Question 810

In an isochoric process, which listed quantity remains zero?

  1. Total heat
  2. Work done
  3. Entropy
  4. Internal energy
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Correct answer: B

Work done

The correct choice is Work done.