Post Utme Physics Past Questions and Answers

Question 601:

Which of the following shows the emission of beta particle?

A. \({ }_{88}^{226} \mathrm{Ra} \rightarrow{ }_{86}^{222} \mathrm{Ra}+{ }_{2}^{4} \mathrm{He}\)
B. \({ }_{7}^{14} \mathrm{~N}+{ }_{2}^{4} \mathrm{He} \rightarrow{ }_{8}^{17} \mathrm{O}+{ }_{1}^{1} \mathrm{H}\)
C. \({ }_{92}^{228} \mathrm{U}+{ }_{90}^{230} \mathrm{Th} \rightarrow 2_{4}^{2} \mathrm{He}+2_{-1}^{0} \mathrm{e}\)
D. \({ }_{84}^{210} \mathrm{Po} \rightarrow{ }_{82}^{206} \mathrm{~Pb}+{ }_{2}^{4} \mathrm{He}\)

Question 602:

The particle and wave nature of matter are demonstrated in the equation.

A. \(\lambda=\frac{c}{f}\)
B. \(\lambda=2 \mathrm{~d} \sin 0\)
C. \(\lambda=\frac{h c}{E}\)
D. \(\lambda=\frac{h}{p}\)

Question 603:

To make a highly sensitive galvanometer, ____________

A. The magnetic field should be made stronger
B. The number of turns of coil should be large
C. The coil should have a small area
D. Should be suspended so it can turn easily.

Question 604:

All these are devices that uses electromagnet in its mode of operation EXCEPT ____________

A. Cell phone
B. Transformers
C. Microphone
D. Induction coil

Question 605:

A coil of 50 turns is pulled in \(0.02\) secs from between the poles of \(a\) magnet where its area includes \(31 \times 10^{-5}\) weber to a place where its area includes \(1 \times\) \(10^{-5}\) weber. Determine the average emf induced in the coil.

A. \(0.75 \mathrm{~V}\)
B. \(0.075 \mathrm{~V}\)
C. \(75 \mathrm{~V}\)
D. \(7.5 \mathrm{~V}\)