Physics Practice MCQ Page 40

Multiple Choice questions for Physics in the sets of 10 each on one page with questions and answers. All sets are useful in the preparation of subject tests for employment or admission.
Question: 3791   In class A amplifiers, current load flows for
  1. full-cycle of the signal
  2. half-cycle of the signal
  3. one-fourth cycle of the signal
  4. all are true
Question: 3792   Which of the following electronic devices is used for digital displays in electronic calculators?
  1. photodiodes
  2. zener diodes
  3. LEDs
  4. SRCs
Question: 3793   choose the incorrect statement
  1. the velocity of the photoelectrons is inversely proportional to the wave length of the light
  2. the velocity of the protoelectrons is directly proportional to the wave length of light.
  3. the number of photoeelctrons emitted is proportional tot he intensity of the light
  4. none of these
Question: 3794   The process of combining two or more of the lightest nuclei resulting in the liberation of large amount of energy is known as
  1. Fission
  2. Reactor
  3. Fusion
  4. none of the above
Question: 3795   cherenkov radiation occurs when
  1. A particle travels faster than the velocity of light in a given medium
  2. X-rays are produced
  3. A particle travels at the velocity of light in a given medium
  4. Electrons are released from the particle on striking the anti-cathode
Question: 3796   Which one of the following is a set of dimensionless physical quantities?
  1. Strain, specific gravity, angle
  2. strain, work, couple
  3. work, angle, specific gravity
  4. work, energy, frequency
Question: 3797   The centre of gravity of a massive hill coincides with its centre of mass, only if
  1. the acceleration due to gravity has the same value over the entire mass distribution
  2. its mass is distributed symmetrically about the centre of mass
  3. its moment of inertia has a minimum value about an axis through the centre of gravity
  4. its gravitational mass equals its inertial mass
Question: 3798   If the angular displacement of a body rotating with a constant angular acceleration is given by θ=14t + 4t2. Where θ is in radian and t in seconds, then its angualr acceleration will be
  1. 14 rad/s2
  2. 4 rad/s2
  3. 2 rad/s2
  4. 8 rad/s2
Question: 3799   Consider the following statements Assertion (A): The moment of intertia of a rigid body reduces to its minimum value, when the axis of rotation passes through its centre of gravity Reason (R): The weight of a rigid body always acts through its centre of gravity
  2. both A and R are true and R is the correct explanation of A
  3. both A and R are true but R is not a correct explanation of A
  4. A is true but R is false
  5. a is false but R is true
Question: 3800   Consider the following statements Assertion (A): The moment of intertia of a rigid body reduces to its minimum value, when the axis of rotation passes through its centre of gravity Reason (R): The weight of a rigid body always acts through its centre of gravity
  2. both A and R are true and R is the correct explanation of A
  3. both A and R are true but R is not a correct explanation of A
  4. A is true but R is false
  5. a is false but R is true
Question: 3946   Consider the following statements Assertion (A):The moment of inertia of a rigid body reduces to its minimum value, when the axis of rotation passes through its centre of gravity Reason (R): The weight of a rigid body always acts through its centre of gravity of these statement
  1. both A and R are true and R is the correct explanation of A
  2. both A and R are true but R is not a correct explanation of A
  3. a is true but R is false
  4. A is false but r is true
Question: 3947   a 10 kg body has a kinetic energy of 500 joules its momentum will be
  1. 25 kg-m/s
  2. 50 kg-m/s
  3. 100 kg-m/s
  4. 250 kg-m/s

Answers to the questions of Physics on this page

Following list gives the correct choice for the answer of the Physics mcqs.
3791 . B       3792 . C       3793 . A       3794 . C       3795 . A       3796 . A       3797 . B       3798 . D       3799 . A       3800 . A       3946 . A       3947 . C      

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