Post Utme Physics Past Questions and Answers

Question 1076:

An object is \(5 cm\) away from the pole of a convex lens whose radius of curvature is \(30 cm\). What is the nature of the object's image?

A. Real and magnified
B. Real and diminished
C. Virtual and magnified
D. Virtual and diminished

Question 1077:

When white light passes through a glass prism, the colours of light coming out arranged in the order of decreasing angle of deviation are ____________

A. Red, orange, yellow
B. Violet, green, red
C. Yellow, red, blue
D. Blue, orange, green

Question 1078:

A man standing at some distance from a sharp cliff, hears the echo of his clap \(1.2\) seconds after he claps. How far from the cliff is the man?
The speed of sound in air is \(340 m / s\)

A. \(283.3 m\)
B. \(204.0 m\)
C. \(408.0 m\)
D. \(566.7 m\)

Question 1079:

Both proton and electron carry charges whose magnitude equals \(1.6 \times 10^{-19}\). Calculate the electrostatic potential between the electron and the proton in a hydrogen atom when the separation between them is \(0.5 \times 10^{-10} m\). \(\left[\varepsilon_{0}=\right.\) \(\left.8.85 \times 10^{-12} N \cdot m ^{2} / C ^{2}\right]\)

A. \(1.84 \times 10^{3} J \)
B. \(2.1 \times 10^{-7} J\)
C. \(9.2\) \(\times 10^{-8 J }\)
D. \(4.6 \times 10^{-18 J }\)

Question 1080:

A uniform magnetic field lies in the positive \(x\)-direction. An electron moving in the negative \(y\)-direction enters the region of the magnetic field. Which of the following statements is true about the direction of motion of the electron?

A. Electron moves in a circle whose plane is parallel to the \(x-y\) plane
B. Electron moves in a circle whose plane is parallel to the \(y-z\) plane
C. Electron moves faster in the negative \(y\)-direction
D. Electron changes direction and begins to move in the positive \(x\)-direction