Jamb 1998 Physics Past Questions And Answers
The most suitable type of mirror used for the construction of the search light is the?
- A. concave mirror
- B. convex mirror
- C. spherical mirror
- D. parabolic mirror
The iron core of an induction coil is made from bundles of wire so as to
- A. minimize eddy-currents
- B. generate eddy-current
- C. prevent sparking at the contact breaker
- D. get the greatest posible secondary voltage
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
- B. t (1 + 1/n)
- C. t (1-1/n)
- D. t (1/n - 1)
Which of the following can be used to reduce local action in a Laclanche cell?
- A. A carbon rod as the positive pole
- B. Pure zinc as the negative pole
- C. Potassium permanganate solution in contact with the positive pole
- D. common salt solution
A ball of mass 0.15kg is kicked against a rigid vertical wall with a horizontal velocity of 50ms-1. If it rebounced with a horizontal velocity of 30ms-1, Calculate the impulse of the ball on the ball · ·
- A. 3.0Ns
- B. 4.5Ns
- C. 7.5Ns
- D. 12.0Ns
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
The velocity of a sound wave at 27oC is 360ms-1. Its velocity at 127oC is
- A. 120?3 ms-1
- B. 240 ms-1
- C. 240?3 ms-1
- D. 720?3 ms-1
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
In a closed organ pipe producing a musical note, an antinode will always be produced at
- A. the closed end
- B. the open end
- C. the middle
- D. all the parts of the pipe
A body on the ground is acted on by a force of 10N at a point P as shown in the fig below. What force is needed to stop the body from moving eastwards?
- A. 5N in the direction of east
- B. 5N in the diretion of west
- C. 5V3N in the direction of west
- D. 10N in the southwest direction