Physics Practice MCQ Page 45
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: 3998 The Joule Thomson expansion produces cooling
- at all initial temperatures and pressures
- above certain initial temperature
- above certain initial pressure
- below certain initial temperature
Question: 3999 Consider the following statements
Assertion (A): the root mean square velocity of molecules of a gas having Maxwellian distribution of velocities, is higher than their most probable velocity, at any temperature
Reason (R): A very small number of molecules of a gas which posses very large velocities increase the root mean square velocity, without affecting the most probable velocity of these statement
- both A and R are true and R is the correct explanation of A
- both A and R are true but R is not a correct explanation of A
- A is true but R is false
- A is false but R is true
Question: 4000 A paramagnetic material is introduced into a current carrying toroid. The magnetization of this material dies not alter the
- magnetic field strength, H anywhere inside the toroid
- self inductance, L of the toroid
- reluctance, R of the magnetic circuit in the toroid
- energy stored in the toroid
Question: 4001 On a conductor of nonuniform curvature, the charge
- has the greatest concentration on the parts of greatest curvature
- has the greatest concentration on the parts of least curvature
- is distributed uniformly on the whole surface
- is distributed uniformly over its volume
Question: 4002 Theapplication of 'Gauss' theorem gives rise to an easy evaluation of electric field in the case of
- a charged body of any geometrical configuration
- charged bodies of regular geometrical configuration
- revolving charged bodies
- charges forming dipoles
Question: 4003 At a point on the axis of an electric dipole,
- the electric field is zero
- the electric potential is zero
- neither the electric field nor the electric potential is zero
- the electric field is directed perpendicular to the axis
Question: 4004 A wire carrying a 30 A current has a length of 12 cm between the pole pieces of a magnet at an angle of 60° with respect to the field direction. If the magnetic field has a uniform value of 0.90 T, then the force on the wire will be
- 280 N
- 28 N
- 2.8 N
- 0.28 N
Question: 4005 Kirchnoff's first law for electric circuits is based on the law of conservation of
- charge
- energy
- momentum
- mass as well as energy
Question: 4006 A current, i is set up in an n-type semiconductor which is placed in a uniform magnetic field, B. When i and B are directed along positive X axis and positive Z axis respectively, the hall electric field E will be established among
- positive Y axis
- negative Y axis
- negative Z axis
- positive Z axis
Question: 4007 A particle of charge 'e' and mass 'm' moves with a velocity 'v' in a magnetic fields 'B' applied perpendicular to its motion. The radius 'r' of its path in the field is
- r=mv/be
- =Be/mv
- r=ev/mB
- r=vB/me
Question: 4008 Rutherford's experiment on the atom demonstrated
- the presence of neutrons inside and atom
- the approximate size of the atom
- the approximate size of a nucleus
- the revolving of electrons in atomic orbits
Question: 4009 Which one of the following statements regarding photo-emission of electrons is correct?
- Kinetic energy of electrons increases with the intensity of incident light
- Electrons are emitted when the wavelength of the incident light is above a certain threshold
- photoelectric emission is instantaneous with the incidence of light
- photo electrons are emitted whenever a gas is irradiated with ultraviolet light
Answers to the questions of Physics on this page
Following list gives the correct choice for the answer of the Physics mcqs.
3998 . D
3999 . A
4000 . A
4001 . A
4002 . B
4003 . C
4004 . C
4005 . A
4006 . C
4007 . A
4008 . C
4009 . D
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MCQ for Practicing Subject Tests