Jamb Physics Past Questions (2010)

A machine of velocity ratio $6$ requires an effort of $400 \text{N}$ to raise a load of $800 \text{N}$ through $1 \text{m}$. Find the efficiency of the machine.

During a thunderstorm, the sound is heard over a long time. This phenomenon is referred to as

Heat is radiated by objects in the form of

In the diagram above, a $200 \text{ W}$ bulb is lighted by a $240 \text{ V}$ a.c. mains supply. If $1 \text{ kWh}$ is sold at $\text{N}40$, the cost of keeping the bulb lighted for a day is.

A stone and a feather drop from the same height above earth surface. Ignoring air resistance, which of the following is correct?

An object is embedded in a block of ice, $10 \text{cm}$ below the surface. If the refractive index of the ice is $1.50$, the apparent depth of the object below the surface is

In an alternating current circuit at resonance, the angle of lead or lag is_.

The density of a certain oil on frying becomes $0.4 \text{ kgm}^{-3}$ with a volume of $20 \text{m}^3$. What will be its initial volume when its initial density is $0.8 \text{ kgm}^{-3}$ assuming no loss of oil due to spillage?

Two cars moving in the same direction have speeds of $100 \text{ kmh}^{-1}$ and $130 \text{ kmh}^{-1}$. What is the velocity of the faster car as measured by an observer in the slower car?

In comparing the camera and the human eye, the film of the camera functions as the