Post Utme Physics Past Questions and Answers

Question 946:

The force of a current carrying conductor in a magnetic field is greatest when the _____________

A. Conductor is at right angles within the field
B. Force is independent of the angle between the field and the conductor
C. Conductor is parallel with the field
D. Conductor makes an angle of 60°with the field

Question 947:

Shadows and eclipses result from the ____________

A. Refraction of light
B. Rectilinear propagation of light
C. Diffraction of light
D. Reflection of light

Question 948:

An object which is \(3 cm\) high is placed vertically \(10 cm\) in front of a concave mirror. If this object produlices an image \(40 cm\) from the mirror, the height of the image is ____________

A. \(0.75 cm\)
B. \(4.00 cm\)
C. \(.8 .00 cm\)
D. \(12.00 cm\)

Question 949:

A boy looks at the image of an object in a plane mirror. He observes two images, a manh bright ohe and the other faint. The observe image result from ____________

A. Reflection only
B. Refraction only
C. Diffraction and interference
D. Reflection and refraction

Question 950:

What must be the distance between an object and a converging lens of focal length \(20 cm\) to produce an erect image two times the object height?

A. \(20 cm\)
B. \(15 cm\)
C. \(10 cm\)
D. \(5 cm\)