Jamb Physics 1998 Past Questions and Answers

Question 31:

• JAMB 1998

The displacement d produced in a glass block of thickness t and refractive index n when an object is viewed through it is

A. T – n
B. T (1 + 1/n)
C. T (1-1/n)
D. T (1/n - 1)

Question 32:

• JAMB 1998

A man wears convex lens glasses of focal length 30cm in order to correct his eye defect. instead of the optimum 25cm, his least distance of distinct vision is

A. 14cm
B. 28cm
C. 75cm
D. 150cm

Question 33:

• JAMB 1998

Which of the following are true about the infra-red radiation? i. it is invisible ii. it is called heat ray iii. its frequency is higher than that of blue light iv. it travels as a transverse wave

A. I, ii, iii and iv
B. I, ii, iv only
C. I, iii, iv only
D. Ii, iii, iv only

Question 34:

• JAMB 1998

The force of repulsion between two point positive charges 5\(\mu\)C and 8\(\mu\)C separated at a distance of 0.02 map art is. [\(\frac{1}{4{\pi}{\varepsilon}_o}\) = 9 x 10⁹Nm²C^-2]

A. 1.8 x 10^-10N
B. 9.0 x 10^-8N
C. 9.0 x 10²N
D. 4.5 x 10³N

Question 35:

• JAMB 1998

An ebonite rod rubbed with fur attracts a glass rod rubbed with silk because

A. Ebonite has a negative charge while glass has a positive charge
B. Ebonite has a positive charge while glass has a negative charge
C. Both have negative charges
D. Both have positive charges