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PHY 102 ELITES

Total questions: 16

Worksheet time: 17mins

Name
Class
Date
1.

Calculate the maximum amount of current flowing through a 5mH inductor, if it stores 50 joules of energy

a)
50 A
b)
100 A
c)

141 A

d)
200 A
2.

The current flowing through the primary windings of a 200/1200 step-up transformer is 6mA. Determine the secondary side current.

a)

0.5mA

b)

2.1mA

c)

1.0mA

d)

6mA

3.

A p-type semi-conductor is doped with a

a)

penta-valent atom

b)

tri-valent atom

c)

tetravalent atom

d)

mono-atomic element

4.

The phase angle of a series R.L.C circuit is usually positive when

a)

The capacitive reactance is greater than the inductive reactance

b)

The inductive reactance is greater than the capacitive reactance

c)

The inductive reactance is equal to the capacitive reactance

d)

None of the above

5.

A 5.08 x 10^-11 kg particle moved in an orbit perpendicular to a uniform magnetic field of 8.06wb/m². Take the charge of the particle to be 1.6 x 10^-19 and approximate radius of orbit as 80mm. Calculate its frequency of motion.

a)

3.4nHz

b)

4.0nHz

c)

5.3kHz

d)

4.1kHz

6.

An R.L.C circuit at resonance has its inductive reactance as 205.7ohm. Determine the capacitive reactance, if the resonance frequency is 62Hz.

a)

411.4ohms

b)

102.85ohms

c)

205.7ohms

d)

12,753 ohms

7.

An 8.0 x 10^-12 electrically charged particle moving at a speed of 50m/s is placed in a uniform magnetic field that is orthogonal to the angle of motion. Determine the magnitude of the magnetic field strength, if a force of 720N is experienced by the particle.

a)

5.4GT

b)

11GT

c)

3.2GT

d)

1.8GT

8.

A conducting material whose resistance is 71.212 at 27°C has its resistance decreased to 20.152 when the temperature reaches 330k. calculate the coefficient of resistance in per kelvin.

a)

-0.127k-1

b)

0.090k-¹

c)

-0.0033k

d)

0.08-*

9.

A cylindrical shape bar magnet produces a flux density of 1.12T through the cross-sectional area of the magnet as it radiates a flux of 197.3μwb all over its surface, Evaluate the diameter of the magnet.

a)

15mm

b)

1.49 m

c)

149cm

d)

0.15m

10.

The total number of diodes required for the construction of a bridged full wave rectifier is

a)

one

b)

two

c)

three

d)

four

11.

Two coils have their no. of turns to be 150 & 80 each. If the cross-sectional area and length of both coils is 10.1x 10^-3m² and 170mm respectively. What is the induced mutual inductance between the two coils?

a)

2.3mH

b)

0.9μH

c)

6.1mH

d)

1.21H

12.

An extrinsic semiconductor is a semiconductor in its state.

a)

excitation state

b)

pure state

c)

doped state

d)

valence state

13.

A covalent bonding is common to

a)

metals

b)

metalloids

c)

non-metals

d)

semi-conductors

14.

Given the phase angle of a house hold ELEPAQ generator to be 51.2", calculate its power factor.

a)

0.61

b)

0.63

c)

0.60

d)

0.62

15.

The magnetic flux generated by a 200 turns per meter wire when a current of 3.08A flows through it is?

a)

0.77mT

b)

0.88mT

c)

1.11mT

d)

0.66mT

16.

What is the full name of your Physic 102 Tutor?

a)

Okpala Ebube Wisdom

b)

Okpara Ebube Wisdom

c)

Okpala Emeke Wisdom

d)

Okoro Ebube Wisdom