Question 4551:

• NECO 2005

Which of the following is used for shielding radioactive fallout?

A. Aluminum
B. Lead
C. Iron
D. Plastic
E. Wood

Question 4552:

• NECO 2005

The charge of an alpha particle can be neutralized by

A. 1 beta particle
B. 2 photons of gamma rays
C. 2 beta particles
D. 4 beta particles
E. 4 photons of gamma rays

Question 4553:

• NECO 2005

Which of the following statements is correct?

A. Alpha particles have a large mass and high penetrating power
B. Alpha particles have a small mass and a low penetrating power
C. Beta partials have no mass and a high penetrating power
D. Beta particles have a large mass and a low penetrating power
E. Gamma rays have no mass and a high penetrating power

Question 4554:

• NECO 2005

Which of the following will reduce the frequency of oscillation of a simple pendulum?

A. Decreasing the length of the string
B. Increasing the amplitude of oscillation
C. Increasing the length of the string
D. Increasing the mass of the bob
E. Reducing the mass of the bob.

Question 4555:

• NECO 2005

A box is pulled a distance s along a smooth horizontal floor by a force of magnitude F, inclined at an angle θ to the horizontal. The work done is

A. Fs cos θ
B. Fs cosec θ
C. Fs sec θ
D. Fs sin θ
E. Fs tan θ