Question 4196:

• WAEC 2019

Calculate the quantity of heat needed to change the temperature of 60g of ice at 0 °C to 80 °C. [specific latent heat of fusion of ice= 3.36 x 10\(^5\) Jkg\(^{-1}\) specific heat capacity of water 4.2 x 10\(^3\) J kg\(^{-1}\) K\(^{-1}\)]

A. 4.80 kJ
B. 20.16 kJ
C. 40.32 kJ
D. 22.17 kJ

Question 4197:

• WAEC 2019

The wire of a platinum resistance thermometer has d resistance of 3.5\(\Omega\) at 0 °C and 10.52\(\Omega\) at 100°C. Calculate the temperature of the wire when its resistance is 7.5\(\Omega\).

A. 78 °C
B. 25 \(^o\)C
C. 30\(^o\)C
D. 57 \(^o\)C

Question 4198:

• WAEC 2019

A transverse pulse of frequency 9 Hz traves 4.5m in 0.6 s. Calculate the wavelength of the pulse.

A. 3.33 m
B. 0.30 m
C. 0.83 m
D. 1.20 m

Question 4199:

• WAEC 2019

In which of the following media is the speed of sound the least?

A. Air
B. Brass
C. Water
D. Wood

Question 4200:

• WAEC 2019

Which of the following characteristics of waves can a ripple tank be used to demonstrate?
I. Reflection
II. Refraction
III. Diffraction

A. I, II and Ill
B. Ll and ll only
C. L and lII only
D. I and II only