Question 4446:

• NECO 2002

Which device does NOT make use of the magnetic effects of an electric current?

A. Hot-wire ammeter
B. Moving-coil ammeter
C. Moving-coil loudspeaker
D. Moving-iron ammeter
E. Telephone earpiece

Question 4447:

• NECO 2002

In the normal use of a simple microscope, a person sees an ____________

A. Erect, real and magnified image
B. Erect, virtual and magnified image
C. Inverted, virtual and magnified image
D. Inverted, real and magnified image
E. Inverted and real image the same size as the object

Question 4448:

• NECO 2002

What is the escape velocity of a satellite launched from the earth’s surface? (Take g as 10ms^-2 and the radius of the earth as 6.4 × 10⁶m)

A. 7.80 × 10-3ms^-1
B. 1.13 × 10-4ms^-1
C. 3.56 × 107ms^-1
D. 6.00 × 107ms^-1
E. 1.20 × 108ms^-1

Question 4449:

• NECO 2002

A body of mass 4 kg is accelerated from rest by a steady force of 9N. What is its speed when it has travelled a distance of 8m?

A. 6 ms^-1
B. 18 ms^-1
C. 32 ms^-1
D. 36 ms^-1
E. 48 ms^-1

Question 4450:

• NECO 2002

A brass cube of side 10cm is heated through 30°C. If the linear expansivity of brass is 2.0 × I0\(^{-5}\) K-1 , what is the increase in its volume?

A. 0.06 cm³
B. 0.18cm³
C. 0.60cm³
D. 1.20cm³
E. 1.80cm³