Physics Practice MCQ Page 48

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: 4029   A satellite is moving in a circular orbit rotating the earth with a diameter of the orbit 2R. At a certain point a rocked fixed to the satellite is fired such that it increases the velocity of satellite tangentially. The resulting orbit of the satellite would be
  1. same as before
  2. circular orbit with diameter greater than 2R
  3. elliptical orbit with minor axis 2R
  4. elliptical orbit with major axis 2R
Question: 4031   If u is the velocity of a particle and c the velocity of light, its relativistic mass m will exceed its rest mass m0 by 4% when the ratio u/c is
  1. 0.4
  2. 0.3
  3. 0.2
  4. 0.1
Question: 4033   Moderation or slowing-down of neutrons is achieved by collision of neutrons with moderator atoms such as deuterium atom. Assuming deuterium atoms to be at rest initially and the collisions as central and elastic, the fractional change in velocity of neutron due to a single collision is approximately
  1. 1/3
  2. 2/3
  3. 3/3
  4. 4/3
Question: 4034   A tennis ball revives a top spin when struck by a racket and describes a curved trajectory. The top spin implies that the rotatory motion of the top surface of the ball is in the direction of the translatory motion of the ball. Which one of the following statements is the best description of the trajectory?
  1. pressure on the top surface is lower; trajectory rises
  2. pressure on the top surface is lower; trajectory dips
  3. pressure on the top surface is higher; trajectory rises
  4. pressure on the top surface is higher; trajectory dips
Question: 4036   Gun shots are made by pouring down molten lead through a sleeve from the top of a tower. the molten liquid while descending breaks into spherical droplets due to
  1. terminal velocity
  2. friction between droplets
  3. viscosity
  4. surface tension
Question: 4038   In the case of beats, the amplitude varies at a frequency equal to
  1. average frequency of the two interfering sound waves
  2. twice the frequency difference of the two interfering sound waves
  3. the frequency difference of the two interfering sound waves
  4. half the frequency difference of the two interfering sound waves
Question: 4039   Two spherical metal balls (of the same material) with radii 0.2 cm and 0.3 cm are falling through a fluid at constant speeds. If the velocity of the 1 ball (radius = 0.2 cm) is 4 cm/sec, what is that of the other ball?
  1. 6 cm/s
  2. 8 cm/s
  3. 9 cm/s
  4. 12 cm/s
Question: 4041   A rocket, moving away from earth with a speed of 0.01 C, gives a signal of frequency 33.33 MHz, where C is the velocity of electromagnetic waves. The apparent frequency observed on earth is
  1. 32.67 MHz
  2. 33.00 MHz
  3. 33.67 MHz
  4. 34.00 MHz
Question: 4042   A wire under tension vibrates with a fundamental frequency of 460 Hz. If the length of the wire is halved, radius made twice and is made to vibrate under one-fourth the tension, then the fundamental frequency will now be equal to
  1. 920 Hz
  2. 460 Hz
  3. 230 Hz
  4. 115 Hz
Question: 4044   Pattern of maximum and minimum intensity distribution of light observed when a monochromatic light passes through a liquid traversed by ultrasonic wave is
  1. a standing wave pattern produced by the ultrasonic wave
  2. a resonance effect produced by the ultrasonic wave
  3. an interference effect produced by the ultrasonic wave
  4. a diffraction effect produced by the ultrasonic wave
Question: 4045   a quartz crystal is capable of generating ultrasonic waves of frequency
  1. varying directly with the length of the crystal along the optic axis
  2. varying inversely with the length of the crystal along the optic axis
  3. varying directly with the thickness of the thickness of the crystal along the electrical axis
  4. varying inversely with the thickness of the crystal increase of pressure increases the melting point
Question: 4047   the Clausius-Clapeyron equation indicates that the increase of pressure increases the melting point
  1. in the case of all substances
  2. in the case of substances which expand on solidification
  3. in the case of substances which contract on solidification
  4. in the case of substances which neither expand nor contract on solidification

Answers to the questions of Physics on this page

Following list gives the correct choice for the answer of the Physics mcqs.
4029 . D       4031 . B       4033 . A       4034 . A       4036 . D       4038 . C       4039 . C       4041 . A       4042 . C       4044 . A       4045 . B       4047 . B      

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