Jamb Physics 1999 Past Questions and Answers

Question 6:

• JAMB 1999

A ball of mass 0.1kg is thrown vertically upwards with a speed of 10ms-1 from the top of a tower 10m high. Neglecting air resistance, its total energy just before hitting the ground is
(take g = 10ms-2)

A. 5 J
B. 10 J
C. 15 J
D. 20 J

Question 7:

• JAMB 1999

A car of mass 800kg attains a speed of 25m/s in 20 secs. The power developed in the engine is

A. 1 . 25 x 10⁴ W
B. 2 . 50 x 10⁴ W
C. 1 . 25 x 10⁶W
D. 2 . 50 x 10⁶ W

Question 8:

• JAMB 1999

When the brakes in a car are applied, the frictional force force on the tyres is

A. Is a disadvantage because it is in the direction of the motion of the car
B. Is a disadvantage because it is in the opposite direction of the motion of the car
C. Is an advantage because it is in the direction of the motion of the car
D. Is an advantage because it is in the opposite direction of the motion of the car

Question 9:

• JAMB 1999

If the stress on a wire is 10⁷NM^-2 and the wire is stretched from its original length of 10.00 cm to 10.05 cm. The young's modulus of the wire is

A. 5 . 0 x 10⁴ Nm^-2
B. 5 . 0 x 10⁵ Nm^-2
C. 2 . 0 x 10⁸ Nm^-2
D. 2 . 0 x 10⁹ Nm^-2

Question 10:

• JAMB 1999

A solid weigh 10 .00 N in air, 6 N when fully immersed in water and 7 . 0 N when fully immersed in a liquid X. Calculate the relative density of the liquid, X.

A. 5/3
B. 4/3
C. 3/4
D. 7/10