2020 - JAMB Physics Past Questions and Answers - page 4

Heat is supplied uniformly at the rate of 100W to 1.0 x 10\(^{-2}\)kg of a liquid for 20 seconds. If the temperature of the liquid rises by 5\(^o\)C, then the specific heat capacity of the liquid is 

Two drivers 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\(^2\) of water, then the value of P\(_2\)/P\(_1\) is

The fiqure 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 

In an experiment in which molten naphtha-line is allowed to cool, the cooling curve i n the figure was obtained. The temperature 80\(^o\)C is known as the 

In the figure, the value of R is 

Which of the following instruments consumes the highest current?

		<p>II. Television set</p>

		<p>III. Torch light</p>

		<p>IV. Immersion heater</p>
		</td>
		<td>
		<p>250v</p>

		<p>220v</p>

		<p>6v</p>

		<p>110v</p>
		</td>
		<td>
		<p>1kW</p>

		<p>110W</p>

		<p>30W</p>

		<p>500W</p>
		</td>
	</tr>
</tbody>

2

Which of the following pairs is NOT part of the electromagnetic spectrum? 

I. Radio waves

II. Beta rays

III. Gamma rays

IV. Alpha rays

A substance has half of 3 min. After 6 min, the count rate was observed to be 400. What was its count rate at zero time?