JAMB Physics Past Questions & Answers - Page 120

596.

When the sun, moon and the earth are as shown in the diagram above an observer standing in X is in

A.

Penumbra and sees a partial eclipse

B.

Penumbra and sees a total eclipse

C.

umbra and sees a partial eclipse

D.

umbra and sees a total eclipse

Correct answer is A

No explanation has been provided for this answer.

597.

The diagram above shows two wave forms P and Q at a particular instant in time. the two waves will interface

A.

destructively to produce a wave of larger amplitude

B.

destructively to produce a wave of smaller amplitude

C.

constructively to produce a wave of larger amplitude

D.

constructively to produce a wave of smaller amplitude

Correct answer is A

No explanation has been provided for this answer.

598.

For a rough inclined plane on which lies a body of weight W, the angle θ in the diagram above becomes the angle of friction if

A.

tan θ = coefficient of static friction

B.

cos θ = coefficient of dynamic friction

C.

sin θ = coefficient of sliding friction

D.

sec θ = limiting frictional force

Correct answer is A

No explanation has been provided for this answer.

600.

The fig above shows a block of mass m sliding down a rough inclined plane QP at angle \( \theta \) . The forces acting on the block along QP are

A.

mg sinθ and the normal reaction

B.

mg sinθ and the force of friction

C.

mg sinθ and the normal reaction

D.

mg cosθ and the normal reaction

Correct answer is B

No explanation has been provided for this answer.