JAMB Physics Past Questions & Answers - Page 138

686.

Two mirrors of the same length are arranged as shown above, a ray of light NO strikes the system at O and emerges along PQ. The emergent ray has been deviated through

A.

220 degrees

B.

200 degrees

C.

210 degrees

D.

180 degrees

E.

230 degrees

Correct answer is D

No explanation has been provided for this answer.

687.

The value of the series resistor required to convert the above galvanometer into a voltmeter with a full range deflection of 15V is

A.

985 ohms

B.

990 ohms

C.

995 ohms

D.

1000 ohms

E.

1005 ohms

Correct answer is C

No explanation has been provided for this answer.

688.

A Uniform beam PQ of mass 20kg and length 5m is balanced as shown above, a man of weight 800N stands at M such that QM = 2m. The reaction at P and Q respectively are(take g = 10ms-2)

A.

300N and 500N

B.

420N and 580N

C.

220N and 380N

D.

580N and 420N

E.

382N and 220N

Correct answer is B

No explanation has been provided for this answer.

689.

a body is acted upon by forces applied at points P and Q as shown above their resultant is equal to

A.

2√5N in a direction N 56◦ E

B.

2√5N in a direction N 56◦ W

C.

2√13N in a direction N 56◦ E

D.

2√13N in a direction N 56◦ W

E.

√10N in a direction N 56◦ E

Correct answer is C

No explanation has been provided for this answer.

690.

what is the resultant resistance in the circuit given above

A.

11Ω

B.

8Ω

C.

4Ω

D.

3.6Ω

E.

4.3Ω

Correct answer is B

No explanation has been provided for this answer.