Waec Physics 1995 Past Questions and Answers

Question 51:

• WAEC 1995

A cell of e.m.f 1.5V and internal resistance 2.552 is connected in series with an ammeter resistance 0.50 and a load of resistance 7.00. Calculate the current in the circuit

A. 0.15A
B. 0.20A
C. 2.1OA
D. 3.00A
E. 6.67A

Question 52:

• WAEC 1995

Which of the following statements are not true of a moving-coil milliammeter? I. It can be used to measure alternating current II. It has a linear scale III. It can be adapted to read higher values of currents IV. A resistor connected in parallel with the milliammeter would convert it to a voltmeter

A. I and IV only
B. II and III only
C. III and IV only
D. I, II and III only
E. I, III and IV only

Question 53:

• WAEC 1995

A radioactive nuclide of mass 6.09 has a half-life of 8 days. Calculate the time during which 5.25g of the nuclide would have decayed

A. 1 day
B. 2 days
C. 8 days
D. 24 days
E. 42 days.

Question 54:

• WAEC 1995

A moving-coil meter with an internal resistance of 100Ω has a full-scale deflection when a current of 10m2 flows through it. What value of resistance would convert it to read 10V at full- scale deflection?

A. 20
B. 100
C. 600
D. 900
E. 1000

Question 55:

• WAEC 1995

Which of the following are emitted from a radioactive substance without altering either the nucleon number or the proton number of the substance?

A. Protons
B. Neutrons
C. Gamma rays
D. Beta particles
E. Alpha particles