Waec Physics 2009 Past Questions and Answers

Question 41:

• WAEC 2009

If the direction of the curent in a straight wire is reversed, the magnetic field

A. Remains the same
B. Becomes parallel to the wire
C. Ceases to exist
D. Is oppositely directed

Question 42:

• WAEC 2009

An inductor of inductance 1.0H is connected in series with a capacitor of capacitance 2.0\(\mu F\) in an a.c. circuit. to resonate

A. 112.5Hz
B. 225.0Hz
C. 323.5Hz
D. 707.1Hz

Question 43:

• WAEC 2009

An ammeter connected to an a.c circuit records 5.5. The peak current in the circuit is

A. 7.8A
B. 7.1A
C. 3.8A
D. 3.5A

Question 44:

• WAEC 2009

Two isotopes of uranium are designed as \(^{238}U\) and \(^{235}U\). The numbers 238 and 235 represent their

A. Atomic numbers
B. Nucleon numbers
C. Proton numbers
D. Neutron numbers

Question 45:

• WAEC 2009

The main difference between between x-rays and \(\gamma-rays\) lies in their

A. Ionizing ability
B. Absorption rate
C. Mode of production
D. Mode of propagation