Jamb Physics 2020 Past Questions and Answers

Question 31:

• JAMB 2020

Two divers G and H are at depths 20m and 40m, respectively below the water surface in a lake. The pressure on G is O${}_1$ while the pressure on H is P${}_2$, If the atmospheric pressure is equivalent to 10m of water, then the value of P${}_2$/P${}_1$ is

A. 0.50
B. 0.60
C. 1.67
D. 2.00

Question 32:

• JAMB 2020

The figure above represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0N. If the efficiency of the machine is 40${}^o$, then the value of W is

A. 28.0N
B. 48.0N
C. 288.0N
D. 50.0N

Question 33:

• JAMB 2020

In an experiment in which molten naphthalene is allowed to cool, the cooling curve i n the figure was obtained. The temperature 80${}^o$C is known as the

A. Cooling temperature
B. Boiling point
C. Melting point
D. Vaporization point

Question 34:

• JAMB 2020

In the figure, the value of R is

A. 3$\mathrm{\Omega }$
B. 6$\mathrm{\Omega }$
C. 4$\mathrm{\Omega }$
D. 5$\mathrm{\Omega }$

Question 35:

• JAMB 2020

Which of the following instruments consumes the highest current?

I. Electric iron	250v	1kW
II. Television set	220v	110W
III. Torch light	6v	30W
IV. Immersion heater	110v	500W

A. I
B. II
C. III
D. IV