Post Utme Physics Past Questions and Answers

Question 1171:

What is the magnitude of the electric field, \(E\) such that an clectron placed in the field would experience an electric force equal to its weight? \(\left( M _{ c }=9.1 \times 10^{-31} kg , g=9.8 m / s ^{2}\right)\).

A. \(5.6 \times 10^{-11} N / C\)
B. \(9.8 \times 10^{-11} N / C\)
C. \(1.6 \times 10^{-19} N / C\)
D. \(5.6 \times 10^{-19} N / C\)

Question 1172:

Which of the following instruments can be used to measure frequency?

A. Ammeter
B. Tachometer
C. Oscilloscope
D. Multimeter

Question 1173:

The spiral spring of a spring balance is \(25.0 cm\) long when \(5 N\) hangs on it and \(30.0 cm\) long, when the weight is \(10 N\). What is the length of the spring, if the weight is \(3 N\) assuming Hooke's Law is obeyed?

A. \(15.0 cm\)
B. \(17.0 cm\)
C. \(20.0 cm\)
D. \(23.0 cm\)

Question 1174:

A boy timed 30 oscillations of a certain pendulum thrice and obtained \(1 min .10 s , 1 min\). \(12 s\) and \(1 min 7 s\) respectively. the mean period of oscillation of the pendulum is

A. 0.14 s
B. 0.43 s
C. 2.32 s
D. 6.97 s

Question 1175:

A trough \(12.0 cm\) deep is filled with water of refractive index \(4 / 3\), by how would a coin at the bottom of the trough appear to be displaced when viewed vertically from above the water surface?

A. \(3.0 cm\)
B. \(6.0 cm\)
C. \(9.0 cm\)
D. 16.0 \(cm\)