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? $(M_c=9.1\times {10}^{-31}kg,g=9.8m/s^2)$.

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 $25.0cm$ long when $5N$ hangs on it and $30.0cm$ long, when the weight is $10N$. What is the length of the spring, if the weight is $3N$ assuming Hooke's Law is obeyed?

A. $15.0cm$
B. $17.0cm$
C. $20.0cm$
D. $23.0cm$

Question 1174:

A boy timed 30 oscillations of a certain pendulum thrice and obtained $1min.10s,1min$. $12s$ and $1min7s$ 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 $12.0cm$ 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. $3.0cm$
B. $6.0cm$
C. $9.0cm$
D. 16.0 $cm$