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
2.0 x 10\(^2\)Jkg\(^-1\)K\(^-1\)
2.0 x 10\(^2\)Jkg\(^-1\)
4.0 x 10\(^4\)Jkg\(^-1\)K\(^-1\)
4.0 x 10\(^4\)Jkg\(^-1\)
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
0.50
0.60
1.67
2.00
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
28.0N
48.0N
288.0N
50.0N
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
cooling temperature
boiling point
melting point
vaporization point
In the figure, the value of R is
3\(\Omega\)
6\(\Omega\)
4\(\Omega\)
5\(\Omega\)
Which of the following instruments consumes the highest current?
|
I. Electric iron II. Television set III. Torch light IV. Immersion heater |
250v 220v 6v 110v |
1kW 110W 30W 500W |
2
I
II
III
IV
Which of the following pairs is NOT part of the electromagnetic spectrum?
I. Radio waves
II. Beta rays
III. Gamma rays
IV. Alpha rays
I and II
III and IV
I and III
II and IV
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?
1600
1200
200
2400