Question 4816:

A concave mirror has a radius of curvature of \(36 \mathrm{~cm}\) at what distance from the mirror should an object be placed to give three times the size of the object?

A. \(12 \mathrm{~cm}\)
B. \(24 \mathrm{~cm}\)
C. \(48 \mathrm{~cm}\)
D. \(108 \mathrm{~cm}\)

Question 4817:

When an ebonite rod is rubbed with fur, it has ____________

A. No charge at all
B. A negative charge
C. A positive charge
D. Negative and positive charges

Question 4818:

The angle between the direction of the earth's magnetic field and the horizontal is called the ____________

A. Angle of deviation
B. Magnetic declination
C. Magnetic meridian
D. Angle of dip

Question 4819:

Calculate the force acting on an electron of charge \(1.6 \times 10^{-19} \mathrm{c}\) placed in an electric field of intensity \(10^{8} \mathrm{Vm}^{-1}\)

A. \(1.6 \times 10^{-14} \mathrm{~N}\)
B. \(1.6 \times 10^{-11} \mathrm{~N}\)
C. \(1.6 \times 10^{-13} \mathrm{~N}\)
D. \(1.0 \times 10^{-16} \mathrm{~N}\)

Question 4820:

Which of the following is the most suitable for use as an altimeter?

A. A mercury barometer
B. A Fortin barometer
C. A mercury manometer
D. An aneroid barometer