Jamb Physics 1980 Past Questions and Answers

Question 21:

• JAMB 1980

A stand-by generator is connected to fifteen 40 W lamps and musician's 600 W amplifying system. How much energy is used if the generator runs for 6 hours?

A. 3.84k Wh
B. 7.20k Wh
C. 8.40k Wh
D. 12.00k Wh
E. 14.56k Wh

Question 22:

• JAMB 1980

A tugboat is travelling from Asaba to Onitsha across the River Niger with a resultant velocity of 20 knots. If the river flows at 12 knots, the direction of motion of the boat relative to the direction of water flow is

A. 36.87^oC
B. 53.13^oC
C. 90^oC
D. 136^oC
E. 143.13^oC

Question 23:

• JAMB 1980

A milliameter of resistance 5$\mathrm{\Omega }$ and full scale deflection of 5m A is to used to measure a potential difference of 50 V. The resistance of the multiplier should be

A. 95$\mathrm{\Omega }$
B. 110$\mathrm{\Omega }$
C. 595$\mathrm{\Omega }$
D. 995$\mathrm{\Omega }$
E. 1005$\mathrm{\Omega }$

Question 24:

• JAMB 1980

An object of mass m and volume v, is totally immersed in a liquid of density p. The tension of a string holding it is

A. Mg
B. (m + pv)g
C. (m - pv)g
D. Pvg
E. [M/m-pv]g

Question 25:

• JAMB 1980

The relative densities of zinc, brass, copper, gold and silver are respectively 7.1, 8.5, 8.9, 19.3, 10.5. A metal ornament which weighs 0.425kg and can displace 50 x 10^-6m³m of water is made of

A. Zinc
B. Brass
C. Copper
D. Gold
E. Silver