Physics Practice MCQ Page 50
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: 4058 The points of units angular magnification in a lens assembly are
- principal points
- focal points
- nodal points
- conjugate points
Question: 4060 A parallel beam of white light is allowed to fall axially on the slit of a spectrometer. A thin air film between parallel glass plates is placed in front of the slit. There are 250 fringes between 4000A0 and 6500A0. The order of the bright fringe corresponding to 500A0 is
- 200
- 250
- 400
- 500
Question: 4061 An astronomical telescope has an objective of focal length 80 cm and gives 8 × angular magnification. The focal length of the eye piece is
- 6.0 cm
- 8.0 cm
- 10.0 cm
- 12.0 cm
Question: 4062 Holograms can be constructed
- and viewed by white light
- by lasers but viewed by white light
- bu monochromatic light and viewed by lasers
- by white light and viewed by lasers
Question: 4063 In He0Ne laser the most favorable ratio of Helium to Neon for satisfactory laser action is
- 1:4
- 4:11
- 1:7
- 7:1
Question: 4064 The electric field at 20 cm from the centre of a uniformly charged dielectric sphere of radius 10 cm is E. Then at a distance 5 cm from the centre it will be
- 16 E
- 4 E
- 2 E
- zero
Question: 4065 When a current of 2A flows in a battery from negative to positive terminal, the p.s across it is 12V. If a produces a p.d. of 15 V, the emf of the battery is
- 12.6 V
- 13.2 V
- 13.5 V
- 14.0 V
Question: 4067 A coil, a capacitor and an AC source of rms voltage 24V are connected in series. By varying the frequency of the source, a maximum rms current of 6A is observed. If this coil is connected to a battery of emf 12 V and internal resistance 4ω the current through it will be
- 2.4 A
- 1.8 A
- 1.5 A
- 1.2 A
Question: 4068 Which one of the following statements is correct?
- voltage across L and C in series 180° out of phase, while for L and C in parallel the currents are 180° out of phase
- an inductor is used in series for effective filtering of low frequency ac
- in circuits used for transporting electric power, a high power factor implies power losses in transmission
- power factor can often be improved by the use of higher resistance in circuit
Question: 4070 When a current carrying thin rectangular copper sheet is placed in a magnetic field such that the direction of current and magnetic field are perpendicular to each other, voltage developed across the sheet will be
- int he direction of the current
- in the direction of the magnetic field
- in the plane containing the directions of current and the magnetic field
- in the direction perpendicular to both the direction of current and magnetic field
Question: 4072 If the temperature of the cold junction of a thermocouple is increased, then the
- temperature of inversion is increased
- temperature of inversion is lowered
- temperature of inversion does not change
- neutral temperature changes accordingly
Question: 4166 A body falling freely under gravity travels half its path in the last one second. The total time of fall is approximately
- 4.4s
- 3.4s
- 2.4s
- 2.0s
Answers to the questions of Physics on this page
Following list gives the correct choice for the answer of the Physics mcqs.
4058 . C
4060 . B
4061 . C
4062 . C
4063 . D
4064 . D
4065 . B
4067 . C
4068 . A
4070 . D
4072 . B
4166 . B
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MCQ for Practicing Subject Tests