Neco Physics 2001 Past Questions and Answers

Question 11:

• NECO 2001

In 24 days a radioactive isotope decreases in mass from 128g to 2g. What is the half-life of the radioactive material?

A. 2.54 days
B. 4.00 days
C. 4.80 days
D. 6.00 days
E. 8.00 days

Question 12:

• NECO 2001

The invisible part of the spectrum of white light consists of ____________

A. Infra-red and ultra-violet only
B. Infra-red, ultra-violet and blue only
C. Red, orange and green only
D. Red and violet only
E. Yellow and indigo only

Question 13:

• NECO 2001

50cm³ of air at a pressure of 5Nm^-2 is enclosed in a metal tube by a piston. If the piston is pushed in a distance of 10cm, what will the pressure of the air become, if the cross-sectional area of the tube is 2cm^-2? (Assume that the temperature remains constant throughout)

A. 12.5 Nm^-2
B. 8.7 Nm^-2
C. 8.3 Nm^-2
D. 3.8Nm^-2
E. 3.0Nm^-2

Question 14:

• NECO 2001

Which scientist discovered natural radioactivity?

A. Enrico Fermi
B. Henri Becquerel
C. Marie Curie
D. Micheal Faraday
E. Niels Bohr

Question 15:

• NECO 2001

Totally reflecting prisms are preferred to mirrors in periscopes because

I. mirror givegive multiple images
II. silvering on mirrors is easy damaged
III. mirrors reflect less light than totally reflecting prisms

A. I only
B. I and II only
C. I and III only
D. II and III only
E. I,II and III