Test Series-16

## Instructions

• Your test contains 20 multiple choice questions with only one answer
• This is 30 min test.Please make sure you complete it in stipulated time
• You can Finish this test any time using 'Submit' button.
• Once finished you get a chance to review all question with correct answers and their solutions.

1.Which of these is false for electric charge?
• e (1.6X10-19 C) is the elementary charge
• charge can not be destroyed or created
• 1 Coulumb of charge contain 6.25X1017 electron
• Coulomb law of electric force between the charges follows Newton's third law of motion
• The net force on any charge equals the vector sum of the forces exerted on it by all the charges

A parallel plate capacitor has capacitance C. It is connected to a battery of EMF E until fully charged, and then disconnected. The plates are then pulled apart an extra distance d, during which the measured potential difference between them changed by a factor of i.
2) Did the potential difference increase or decrease by a factor of i?
• decrease
• increase

3. What is true about electric field between the plates
• electric field remains unchanged
• electric field decrease by the factor i
• electric field increase by the factor i
• None of these

4..What is true of energy stored in electric field?
• Energy remains unchanged
• Energy decrease by the factor i
• Energy increase by the factor i
• None of these

5.What happens the to the capacitance ?
• Capacitance increases
• Capacitance decreases
• Capacitance remains unchanged

6. Electromotive force represents
• Work
• Momentum
• Power
• Energy per unit change
• Force

7. Which of the following is False?
• Kirchoff's first law of electric circuit is law of conservation charge
• Kirchiff's second law of electric circuit is law of conservation of energy
• Kirchoff's second law is based on law of conservation of momentum
• None of these

8. Both electric forces and magnetic forces can deflect electron. Which of the following statement is false?
• Kinetic energy of the electron does not change in magnetic field
• Kinetic energy of the electron do change in electric field
• Kinetic energy neither changes in electric field nor in magnetic field
• None of these

9.A particle is moving vertically downward.it passes through a magnetic field directed from south to north in a horizontal plane.which of the following is false?
• If the particle is positively charged ,it will be deflected towards east
• If the particle is negatively charged ,it will be deflected towards east
• If the particle has no charge ,it will not be deflected
• None of these

10.A charged particle at rest experiences no forces. At the location of the particle
• electric field may or may not be zero, Magnetic Field must be zero
• electric field may or may not be zero, Magnetic Field may or may not be zero
• electric field must be zero,Magnetic Field must be zero
• electric field must be zero, Magnetic Field may or may not be zero

11. A Proton moving with constant velocity passes through a region without any change in its velocity. If E and B denote electric and magnetic field,this region cannot have
• E > 0, B >0
• E=0,B=0
• E > 0,B=0
• E=0,B > 0

12. A bar magnet falls verticall down through a coil placed in horizontal plane? What will be the acceleration of bar magnet?
• g
• greater than g
• less than g
• zero
13. which of these are true?
• A conducting rod XY moves parallel to the x-axis in a unform magnetic field poiting in +z direction.The end X is towards -y direction.The end X will be positiveely charged
• A square coil of metal wire is stationary in a non-uniform magnetic field,An Emf is induced in the coil
• The self inductance of the straight conductor is very large
• Lenz's law is a consequence of the law of conservation of charge
14. An inductor stores energy in its
• Magnetic field
• Electric field
• electric and magnetic field both
• None of these
15. which of these is not true for radioactive decay.
• The penetrating power of Gamma rays is highest among the radioative radiation
• alpha and beta particles are deflected by electric and magnetic field but gamma rays are not
• None of these
16. When a ray of light enters a glass slab from air
• Wavelenght decreases
• Frequency increase
• Neither wavelenght nor frequency changes
• None of these
17. Which of the these is true in Bohr model of hydrogen atom
• The total energy of electron in the mth orbit is inversely proportional to m
• radiation are emmited when electron jumps from lower orbit to higher orbit
• The radius of the mth orbit is inversely propotional to m
• Angular momentum of the electron in mth orbit is an integral multiple of h/2π
18. In an AC circuit, which of these is true?
• The applied instantanous voltage equal to the algebric sum of the instantanous voltages across the different element
• The applied instantanous voltage equal to the vector sum of the instantanous voltages across the different element
• Power dissipation happens in inductor and resistance in an AC circuit
• None of these
19. If the distance between the earth and sun were half its present value,the number of days in the years would have been
• 129
• 730
• 181
• 64.5
20. Which of these is false for movement of alpha and beta particles in electric and magnetic field
• Both the article move in circular path in magnetic field
• curvature of path of beta particle is more than the curvature of alpha particle in magnetic field
• Deflection of alpha particle is opposite to that beta particle in electric field
• None of these

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