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

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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. The magnetic moment of a circular coil carrying current is

directly proportional to the length of the wire in the coil inversely proportional to the length of the wire in the coil directly proportional to the square of the length of the wire in the coil inversely proportional to the square of the length of the wire in the coil

2. The primary origin (s) of magnetism lies in

atomic currents polar nature of molecules extrinsic spin of electron None of these

3. The AC voltage across a resistance can be measured using a

hot wire voltmeter moving coil galvanometer potential coil galvanometer moving magnet galvanometer

4. In a cyclotron, a charged particle

undergoes acceleration all the time speeds up between the dees because of the magnetic field speeds up in a dees slows down within a dee and speeds up between dees

5. A deuteron of kinetic energy 50 keV is describing a circular orbit of radius 0.5 metre in a plane perpendicular to the magnetic field B. The kinetic energy of the proton that describes a circular orbit of radius 0.5 metre in the same plane with the same B is

25 keV 50 keV 200 keV 100 keV

6. Magnetic field inside a solenoid is

directly proportional to its length directly proportional to current inversely proportional to total number of turns inversely porportional to current

7. Materials suitable for permanent magnet, must have which of the following properties?

High retentivity, low coercivity and high permeability. Low retentivity, low coercivity and low permeability. Low retentivity, high coercivity and low permeability. High retentivity, high coercivity and high permeability.

8. A current carrying loop is placed in a uniform magnetic field. The torque acting on it does not depend upon

shape of the loop area ot the loop value of the current magnetic field

9. A milli voltmeter of 25 milli volt range is to be converted into an ammeter of 25 ampere range. The value (in ohm) of necessary shunt will be

0.001 0.01 1 0.05

10. A current carrying circular loop of radius R is placed in the x-y plane with centre at the origin. Half of the loop with x > 0 is now bent so that it now lies in the y-z plane.

The magnitude of magnetic moment now diminishes The magnetic moment does not change The magnitude of B at (0, 0, z), z > R increases The magnitude of B at (0, 0, z), z >> R is unchanged

11. Two parallel circular coils of equal radii having equal number of turns placed coaxially and separated by a distance equal to the radii of the coils carrying equal currents in same direction are known as

Biot-savart’s coils Ampere’s coils Helmholtz coils Oersted’s coils.

12. If a long hollow copper pipe carries a direct current, the magnetic field associated with the current will be

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

13. In a moving coil galvanometer, the deflection of the coil θ is related to the elecrical current i by the relation

i ∝ tan θ i ∝θ i ∝ θ2 i ∝ θ

14. The current sensitivity of a galvanometer is defined as

the current flowing through the galvanometer when a unit voltage is applied across its terminals. current per unit deflection. deflection per unit current. dflection per unit current when a unit voltage is applied across its terminals

15. A proton and an alpha particle both enter a region of uniform magnetic field B, moving at right angles to field B. If the radius of circular orbits for both the particles is equal and the kinetic energy acquired by proton is 1 MeV the energy acquired by the alpha particle will be:

0.5 MeV 1.5 MeV 1 MeV 4 MeV

16. Ampere’s circuital law is equivalent to

Biot-Savart law Coulomb’s law Faraday’s law Kirchhoff’s law

17. If a current is passed through a spring then the spring will

expand Answer: compress remains same None of these

18. Two parallel wires carrying currents in the same direction attract each other because of

potential difference between them mutual inductance between them electric forces between them magnetic forces between them

19. The magnetic dipole moment of a current loop is independent of

magnetic field in which it is lying number of turns area of the loop current in the loop'

20. A charged particle enters in a uniform magnetic field with a certain velocity. The power delivered to the particle by the magnetic field depends on

force exerted by magnetic field and velocity of the particle. angular speed w and radius r of the circular path. angular speed w and acceleration of the particle. None of these

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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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