Physics 1994 Waec Past Questions and Answers

Question 26 :

• WAEC 1994

Beta particles are

A. Electrons
B. Protons
C. Neutrons
D. Helium nuclei
E. Tritium nuclei

Question 27 :

• WAEC 1994

Which of the following substances is not an insulator?

A. Aluminium
B. Glass
C. Plastic
D. Clay
E. Cork

Question 28 :

• WAEC 1994

When an atom loses or gains a charge, it becomes an

A. Ion
B. An electron
C. A neutron
D. A proton
E. A deuteron

Question 29 :

• WAEC 1994

In 24 days a radioactive isotope decreases in mass from 64g to 2g. What is the half life of the radioactive material

A. 0.75 days
B. 2.58 days
C. 4 days
D. 4.80 days
E. 6 days

Question 30 :

• WAEC 1994

The nucleon number and the proton number of a neutral atom of an element are 238 and 92 respectively. What is the number of neutrons in the atom?

A. 330
B. 238
C. 146
D. 119
E. 73