PAST-QUESTION PHY112 ( PHYSICS112 CODE: PHY 112 COURSE TITLE: ELECTRICITY, MAGNETISM AND MODERN PHYSICS COURSE)

In this blog post, we provide you with a valuable resource for preparing for the PHY 112 examination. You'll have access to a collection of past questions and answers specifically compiled from the University of Delta, Agbor's previous tests. These questions are not only beneficial for students at this university but also for students across all Nigerian universities who are studying for the PHY 112 examination. Whether you're gearing up for an upcoming test or engaging in personal studies to deepen your understanding of electricity, magnetism, and modern physics, this compilation will serve as an excellent study tool.

These questions cover a wide range of topics within the course, offering insights into the types of questions you might encounter and the solutions you need to master. By practicing with these questions, you can enhance your problem-solving skills, reinforce your theoretical knowledge, and increase your confidence in tackling exam questions. This resource aims to support your academic journey, ensuring you are well-prepared for your examinations and your future studies in the field of physics. 

phys112 

PAST-QUESTIONS

 CODE: PHY 112
COURSE TITLE: ELECTRICITY, MAGNETISM AND MODERN PHYSICS COURSE

1.   Tesla is a unit of

A. Field strength

B. Inductance

C. Flux density

D. Flux

ANS= C

2.   A magnetic field exists around

A. Iron

B. Copper

C. Aluminum

D. Moving charges

ANS= D

3.   The direction of magnetic lines of force is:

A. from south pole to north pole

B. from north pole to south pole

C. from one end of the magnet to another

D. none of the above

ANS= B

4.   The ratio of permittivity of a material to that of free space is known as:

A. relative permittivity

B. susceptibility

C. flux density

D. relative permeability

ANS= A

5.   The most effective and quickest way of making a magnet from soft iron is by:

A. placing it inside a coil carrying current

B. induction

C. the use of permanent magnet

D. rubbing with another magnet

ANS= D

6.   Two equal and opposite charges are placed 40mm apart. If the force between them is 0.5N, calculate the magnitude of the charge (Assume 1 4𝜋𝜀0= 9.0 × 109𝑁𝑚2𝑐2).

A. 2.98 × 10−13𝐶

B. 2.98 × 10−15𝐶

C. 2.98 × 10−14𝐶

D. 2.98 × 10−12𝐶

ANS= A

7.   Determine the area of the parallel plate capacitor in the air if the capacitance is 25 × 10−9𝐹 and the

separation between the plates is 0.04𝑚. (𝐴𝑠𝑠𝑢𝑚𝑒 𝜀0 = 8.854 × 1012 𝑓 𝑚⁄ )

A. 122.94𝑚2

B. 114.94𝑚2

C. 113.94𝑚2

D. 112.94𝑚2

ANS= D

8.   A metal is illuminated with light of energy 4.4 × 10−19𝐽. If the work function of the metal is 3.04 ×10−19𝐽. Calculate the threshold wavelength. (𝐴𝑠𝑠𝑢𝑚𝑒 ◻ = 6.6 × 10−34𝐽𝑆, 𝑉𝑒𝑙𝑜𝑐𝑖𝑡𝑦 𝑜𝑓 𝑙𝑖𝑔𝑡 =3.0 × 108𝑚/𝑠).

A. 6.5 × 10−7𝑚 B. 6.8 × 10−8𝑚

C.6.5 × 10−9𝑚

D.6.8 × 10−7𝑚

ANS= C

9.   A 0.4nm diameter copper wire carries a current of 3μA. Find the current density

A. 89.23Am-2

B. 23.89Am-2

C. 38.29Am-2

D. 93.28Am-2

ANS= B

10.  Calculate the e.m.f induced in a coil of 200turns placed in a field were the rate of change of flux is

0.01wbs-1

A. -12V B.-0.12V

C. -1.2V

D. -2.0V

ANS= D

11.  The law which states that “the direction of the induced e.m.f is such that it tends to oppose the change

that produces it” is associated with

A. Maxwell’s law

B. Faraday’s law

C. Lenz’s law

D. Gauss’s law

ANS= C

12.   A 20mH inductor is connected in series with a 6μF capacitor. What is the angular frequency of the

circuit

A. 9132.4rad/s

B. 3219.42rad/s

C. 9321rad/s

D. 9421.32rad/s

ANS= C

13.   Calculate the binding energy for 2311Na Take ( Atomic mass = 22.98977iu , mass of proton =

1.007825u , mass of neutron = 1.008665u u=931mev)

A. 186.5Mev

B. 168.5Mev

C. 185.6Mev

D. 156.8Mev

ANS= C

14.   The minimum energy needed to eject an electron from a metal surface is called

A. Work function

B. Threshold frequency

C. Threshold wavelength

D. Radiation intensity

ANS= A

15.   There resistors 2 Ω , 6 Ω and 9 Ω are connected in parallel. Calculate the equivalent resistance

A. 2.3Ω

B. 1.3 Ω

C. 1.0 Ω

D. 17.0 Ω

ANS= B

16.   What is the S.I. Unit of charge?

A. Ohms

B. Coulombs

C. Farads

D. Newtons

ANS= B

17.   Continuous flow of charge can be generated from the following except

A. Photo cells

B. Thermoelectricity

C. A.C. generator

D. Radio waves

ANS= D

18.   Which of the following is not a method of demagnetization?

A. Double touch

B. Heating

C. Hitting the magnet

D. Thermal agitation

ANS= A

19.   A transformer with 220V input and 12V output is a … transformer.

A. Step up

B. Normal

C. Step down

D. Power

ANS= C

20.   The overall resistance of A R-L-C Series circuit is called

A. Inductor

B. Capacitance

C Impedance

D. Voltage

ANS= B

21.   Current in a 60 W light bulb when it is connected to a 230 V power supply is

A. 0.26 A

B. 1.5 A

C. 2.6 A

D. 3.9 A

ANS= A

22.   Magnitude of induced e.m.f is proportional to

A. rate of change of current

B. rate of change of voltage

C. rate of change of magnetic flux linkage

D. rate of change of resistance

ANS= C

23.   When lightning strikes a lightning rod on top of a tall building, electrical energy flows through a wire

and into the           

A. cloud

B. ground

C. roof

D. Atmosphere

ANS= B

24.   If the resistivity of a wire is 4 x 107 m, the resistances of a pieces of wire of length 20m and

cross sectional area 8 x 10-6 M2 is

A. 1.0

B. 10.0

C. 0. 5

D. 5.0

25.   Calculate the power delivered by a 3-phase line, if its voltage and current are 120V and 60A

respectively.

A. 20kw

B. 7.2kw

C. 2.4kw

D. 0.2kw

ANS= B

26.   Capacitor is fully charged if potential difference is equal to

A. e.m.f

B. current

C. resistance

D. power

ANS= A

27.   A capacitor has capacitance of 2μF. Find the capacitive reactance if a frequency of 50Hz and 220V

a.c voltage are applied?

A. 5.2

B. 1.6

C. 1.3

D. 0.6

ANS= A

28.   In a                           circuit, the total resistance is smaller than the smallest resistance in the circuit.

A. Series 5

B. Parallel

C. Either series or parallel

D. Neither series nor parallel

ANS= B

29.   A 3A current passes through an electric circuit for 5 minutes and 900 J of work is done. Find the emf.

A. 2V

B. 3V

C. 5V

D. 1V

ANS= D

30. Kirchhoff's 2nd law deals with

A. current in circuit

B. voltage in circuit

C. e.m.f in circuit

D. both B and C

ANS= B

We hope this compilation aids you in your academic endeavors, supports your personal study efforts, and ultimately helps you achieve success in your examinations. Keep practicing, stay curious, and continue exploring the fascinating world of physics. Good luck!!!!