Elementary Modern Physics - Jamb Physics Past Questions and Answers

Question 1:

• JAMB 1978

Of the following which is different from the other?

A. X-rays
B. Gamma-rays
C. Cathode rays
D. Ultra violet rays
E. Infrared rays

Question 2:

• JAMB 1979

Which of the following is the correct definition of 'half-life'?

A. The average life-time of a radioactive material
B. The time it takes a radioactive material to decay to half of its original quantity
C. Half the period a radioactive material decays completely
D. Half of the decay constant
E. The decay constant times life-time

Question 3:

• JAMB 1979

Which of the following statements about radioactivity are true? i. alpha particle is positively charged ii. Beta particle is negatively charged iii. Gamma ray is neutral iv. Beta particle has the same mass as helium atom v. Gamma ray is charged

A. I, ii, iii and iv only
B. Iv and v only
C. I, ii and iii only
D. I, ii and v only
E. All

Question 4:

• JAMB 1980

Which of the following statements are true in the structure of atoms?

A. The atoms of the differnt element differ only in the number of protons and electrons
B. The num,ber of protons equals the number of electrons
C. Atoms are constructed according to the plan of our solar system
D. All of the above
E. A and C only

Question 5:

• JAMB 1980

Which of the following are true of atom?

A. Atoms are indestructible
B. All atoms of a pure substance, or elements are identical
C. Atoms of different substance have different weights
D. All of the above
E. A and B only