NEET Physics Magnetic Equipments MCQs Set A

a) both

b) None of these

c) deflection magnetometer

d) vibration magnetometer

Answer: both

Question:  A dip circle is taken to geomagnetic equator. The needle is allowed to move in a vertical plane perpendicular to the mangetic meridian. the needle will stay in

a) any direction it is released

b) any direction except vertical and horizontal

c) vertical direction only

d) horizontal direction only

Answer: any direction it is released

Question:  Two short magnets with their axes horizontal and perpendicular to the magnetic maridian are placed with their centres 40 cm east and 50 cm west of magnetic needle. If the needle remains undeflected, the ratio of their magnetic moments M₁ : M₂ is

a) 64 : 125

b) 16 : 25

c) 4 : 5

d) None of these

Answer: 64 : 125

Question: Tangent galvanometer is an instrument is used to measure

a) current

b)emf

c) magnetic field

d) None of these

Answer: current

Question: Two tangent galvanometers having coils of the same radius are connected in series. A current flowing in them produces deflections of 60º and 45º respectively. The ratio of the number of turns in the coils is

a)

b)

c)

d) 4/3

Answer:

Question:  The period of oscillation of a magnet in a vibration magnetometer is 2 sec. The period of oscillation of a magnet whose magnetic moment is four times that of the first magnet is

a) 1 sec

b) 5 sec

c) 8 sec

d) 0.5 sec

Answer: 1 sec

Question:   Two short magnets have equal pole strengths but one is twice as long as the other. The shorter magnet is placed 20 cms in tan A position from the compass needle. The longer magnet must be placed on the other side of the magnetometer for no deflection at a distance equal to

a) 20 (2)^1/3 cms

b) 20 (2)^3/3 cms

c) 20 cms

d) None of these

Answer: 20 (2)^1/3 cms

Question:  A compass needle placed at a distance r from a short magnet in Tan A position shows a deflection of 60º. If the distance is increased to r (3)^1/3, then deflection of compass needle is

a)

b)

c) Both

d) None of these

Answer:

Question:

a)

b)

c)

d) None of these

Answer:

Question:  The magnetic needle of a tangent galvanometer is deflected at an angle 30° due to a magnet. The horizontal component of earth¢s magnetic field 0.34 × 10^–4 T is along the plane of the coil. The magnetic intensity is

a) 1.96 × 10^–5 T

b) 1.96 × 10⁵ T

c) 1.96 × 10^–4 T

d) None of these

Answer: 1.96 × 10^–5 T