A small coin is resting on the bottom of a beaker filled with a

Subject

Physics

Class

NEET Class 12

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsMultiple Choice Questions

31.

A charged particle (charge q ) is moving n a circle of radius R with uniform speed v. The associated magnetic moment μ is given by:

  • qvR/2

  • qVR2

  • qVR2/2

  • qVR2/2

2058 Views

32.

A steady current of 1.5 A flows through a copper voltameter for 10 min. If the electrochemical equivalent of copper is 30 x 10-5 g C-1, the mass of copper  deposited on the electrode will be:

  • 0.40 g

  • 0.50 g

  • 0.67 g

  • 0.67 g

970 Views

33.

A hollow cylinder has to charge q coloumb within it. Φ is the electric flux in a unit of voltmeter associated with the curved surface B, the flux linked with the plane surface A in a unit of voltmeter will be:

  • 1 half open parentheses q over epsilon subscript o minus capital phi close parentheses
  • fraction numerator straight q over denominator 2 straight epsilon subscript straight o end fraction
  • straight ϕ over 3
  • straight ϕ over 3
579 Views

34.

In mass spectrometer used for measuring the masses of ions, the are initially accelerated by an electric potential V and then made to describe semicircular paths of radius R using a magnetic field B. If V and B are kept constant, the ratio open parentheses fraction numerator charge space on space the space ion over denominator mass space of space the space ion end fraction close parentheses will be proportional to:

  • 1/R

  • 1/R2

  • R2

  • R2

800 Views

Advertisement
35.

Three resistances P, Q, R each of 2 Ω and an unknown resistance S form the four arms of a Wheatstone's bridge circuit. When a resistance of 6 Ω is connected in parallel  to S the bridge gets balanced. What is the value of S? 

  • 2 Ω

  • 3 Ω

  • 6 Ω

  • 6 Ω

380 Views

36.

The electric and magnetic field of an electromagnetic wave are:

  • in phase and parallel to each other

  • in opposite phase and perpendicular to each other

  • in opposite phase and parallel to each other

  • in opposite phase and parallel to each other

386 Views

37.

Charge +q and -q are placed at points A and B respectively which are distance 2L apart, C is the midpoint between A and B.The work done in moving a charge + Q along the semicircle CED is:

300 Views

38.

A common emitter amplifier has a voltage gain of 50, an input impedance of 100 Ω and an output impedance of 200 Ω. The power gain of the amplifier is:

  • 500

  • 1000

  • 1250

  • 1250

687 Views

Advertisement
39.

In radioactive decay process, the negatively charged emitted beta particles are:

  • the electrons present inside the nucleus

  • the electrons produced as a result  of the decay of neutrons inside the nucleus

  • the electrons produced as a result of collisions between atoms

  • the electrons produced as a result of collisions between atoms

424 Views

Advertisement

40.

A small coin is resting on the bottom of a beaker filled with a liquid. A ray of light from the coin travels up to the surface of the liquid and moves along its surface (see figure).



How fast is the light travelling in the liquid?

  • 1.8 x 108 m/s

  • 2.4 x 108 m/s

  • 3.0 x 108 m/s

  • 3.0 x 108 m/s


A.

1.8 x 108 m/s

The critical angle is the angle of incidence in the denser medium for which the angle of refraction in the rarer medium is 90o

As shown in figure, a light ray from the coin will not emerge out of liquid, if i> C


Therefore, minimum radius R corresponds to 

i= C. In ΔSAB,

1028 Views

Advertisement
Advertisement