JAMB Physics Past Questions & Answers - Page 73

361.

What effort will a machine of efficiency 90% apply to a load of 180N if its efforts arm is twice as long as its load arm?

A.

100N

B.

90N

C.

80N

D.

120N

Correct answer is A

No explanation has been provided for this answer.

362.

An object moves in a circular path of radius 0.5m with a speed of 1ms\(^{-1}\). What is its angular velocity?

A.

8rads\(^{-1}\)

B.

4rads\(^{-1}\)

C.

1rads\(^{-1}\)

D.

2rads\(^{-1}\)

Correct answer is D

No explanation has been provided for this answer.

363.

In homes, electrical appliances and lamps are connected in parallel because

A.

less current will be used

B.

less voltage will be used

C.

parallel connection does not heat up the wires

D.

series connection uses high voltage

Correct answer is D

No explanation has been provided for this answer.

364.

In the diagram shown, If the south-poles of two magnets stroke a steel bar, the polarities at T and V will respectively be

A.

north and south

B.

south and south

C.

north and north

D.

south and north

Correct answer is C

No explanation has been provided for this answer.

365.

Musical instruments playing the same note can be distinguished from one another owing to the difference in their

A.

quality

B.

pitch

C.

intensity

D.

loudness

Correct answer is A

Sound "quality" or "timbre" describes those characteristics of sound which allow the ear to distinguish sounds which have the same pitch and loudness