Physics 2020 JAMB Past Questions

1

A few grains of table salt were put in a cup of cold water, kept at constant temperature and left undistributed. Eventually all the water tested salty. This action is due to?

• A. convection
• B. osmosis
• C. capillarity
• D. diffusion
JAMB 2020
2

The force required to make an object of mass m, travelling with velocity v, turn in a circle of radius r is

• A. $$\frac{mv^2}{r}$$
• B. $$\frac{mr^2}{x}$$
• C. $$\frac{mr}{v}$$
• D. $$\frac{mv}{r^2}$$
JAMB 2020
3

A machine gun with a mass of 5kg fires a 50g bullet at a speed of 100 ms$$^{-1}$$. The recoil speed of the machine gun is

• A. 0.5 ms$$^{-1}$$
• B. 1.5 ms$$^{-1}$$
• C. 1 ms$$^{-1}$$
• D. 2ms$$^-1$$
JAMB 2020
4

If in a simple pendulum experiment the length of the inextensible string is increased by a factor of four, its period is increased by a factor of?

• A. 4
• B. $$\frac{\pi}{2}$$
• C. $$\frac{1}{4}$$
• D. 2
JAMB 2020
5

In what range of temperature is the expansion of water anomalous?

• A. +208$$^o$$C to +212$$^o$$C
• B. -80$$^o$$C + -76$$^o$$C
• C. 0$$^o$$C to +4$$^o$$C
• D. -4$$^o$$C to +0$$^o$$C
JAMB 2020