Neco Physics 2002 Past Questions and Answers

Question 21:

• NECO 2002

The silvered walls of a vacuum flask minimise loss of heat due to ____________

A. Conduction and convection
B. Conduction only
C. Convection and radiation
D. Convection only
E. Radiation only

Question 22:

• NECO 2002

The phenomenon of photoelectric effect is NOT used in ____________

A. Automatic doors
B. Bimetallic strip thermometers
C. Light meters in cameras
D. Setting off burglar alarms
E. Sound production from film tracks.

Question 23:

• NECO 2002

Which of the following is a percussion instrument?

A. Bell
B. Flute
C. Guitar
D. Piano
E. Organ

Question 24:

• NECO 2002

A transformer supplies 12V when connected to a 240V mains. If the transformer takes 0.120A from the mains when used to light a 12V, 24W lamp, what is its efficiency?

A. 57.20%
B. 66.60%
C. 83.30%
D. 92.50%
E. 100%

Question 25:

• NECO 2002

Which of the following is/are TRUE of nuclear fission?

I. A heavy nucleus is split into two nuclei of comparable masses.
II. Two light nuclei are joined together to form a heavier nucleus.
III. The total mass of the products is less than that of the reactants.

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