CUET Physics Mock Test Unit III Magnetic Effects of Current and Magnetism Set A

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Mock Test for CUET Physics Unit III Magnetic Effects of Current and Magnetism

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Unit III Magnetic Effects of Current and Magnetism Mock Test for CUET Physics

1. Which of the following is true ?

Parallel currents repel, and antiparallel currents attract. Parallel currents attract, and antiparallel currents repel. Both parallel and antiparallel currents attract. Both parallel and antiparallel currents repel.

2. In cyclotron the resonance condition is

the frequency of revolution of charged particle is equal to the frequency of A.C. voltage sources the frequency of revolution of charged particle is equal to the frequency of applied magnetic field the frequency of revolution of charged particle is equal to the frequency of rotation of earth the frequency of revolution of charged particle, frequency of A.C. source and frequency of magnetic field are equal

3. Biot-Savart law indicates that the moving electrons (velocity v) produce a magnetic field B such that

B is perpendicular of B is parallel to it obeys inverse cube law it is along the line joining the electron and point of observationt

4. A charged particle moving in a uniform magnetic field and losses 4% of its kinetic energy. The radius of curvature of its path changes by

2% 4% 10% 12%

5. Magnetic field at the centre of a circular coil of radius r, through which a current I flows is

directly proportional to r inverseley proportional to I directly proportional to I directly proprotional to I2

6. A moving coil galvanometer has N number of turns in a coil of effective area A, it carries a current I. The magnetic field B is radial. The torque acting on the coil is

NA2B2I NABI2 N2ABI NABI

7. An electric charge in uniform motion produces

an electric field only a magnetic field only both electric and magnetic fields no such field at all

8. A wire is placed parallel to the lines of force in a magnetic field and a current flows in the wire. Then

the wire will experience a force in the direction of the magnetic field the wire will not experience any force at all the wire will experience a force in a direction opposite to the field it experiences a force in a direction perpendicular to lines of force

9. A particle of mass m and charge q enters a magnetic field B perpendicularly with a velocity v. The radius of the circular path described by it will be

Bq / mv mq / Bv mB / qv mv / Bq

10. Magnetic dipole moment of a rectangular loop is

inversely proportional to current in loop inversely proportional to area of loop parallel to plane of loop and porportional to area of loop perpendicular to plane of loop and porportional to area of loop

11. The deflection in a moving coil galvanometer is

directly proportional to the torsional constant directly proportional to the number of turns in the coil inversely proportional to the area of the coil inversely proportional to the current flowing

12. A metallic rod of mass per unit length 0.5 kg m–1 is lying horizontally on a smooth inclined plane which makes an angle of 30°with the horizontal. The rod is not allowed to slide down by flowing a current through it when a magnetic field of induction 0.25 T is acting on it in the vertical direction. The current flowing in the rod to keep it stationary is

7.14 A 5.98 A 11.32 A 14.76 A

13. The deflection in a moving coil galvanometer is

directly proportional to the torsional constant directly proportional to the number of turns in the coil inversely proportional to the area of the coil inversely proportional to the current flowing

14. An electron is projected with uniform velocity along the axis of a current carrying long solenoid. Which of the following is true?

The electron will be accelerated along the axis The electron path will be circular about the axis The electron will experience a force at 45° to the axis and hence execute a helical path The electron will continue to move with uniform velocity along the axis of the solenoid

15. If a copper rod carries a direct current, the magnetic field associated with the current will be

only inside the rod only outside the rod both inside and outside the rod neither inside nor outside the rod

16. Lorentz force is

electrostatic force acting on a charged particle. magnetic force acting on a moving charged particle. the vector sum of electrostatic and magnetic force acting on a moving charged particle. the vector sum of gravitational and magnetic force acting on a moving charged particle.

17. Energy in a current carrying coil is stored in the form of

electric field magnetic field dielectric strength heat

18. A charged particle moves through a magnetic field in a direction perpendicular to it. Then the

velocity remains unchanged speed of the particle remains unchanged direction of the particle remains unchanged acceleration remains unchanged

19. A charge q is moving with a velocity v parallel to a magnetic field B. Force on the charge due to magnetic field is

q v B q B/v zero B v/q

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CUET Physics Unit III Magnetic Effects of Current and Magnetism Mock Test

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Mock Tests for Physics CUET Unit III Magnetic Effects of Current and Magnetism

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