Question 4186:

• WAEC 2019

Which of the following waves is not mechanical?

A. Waves in pipes
B. Water waves
C. Radio waves
D. Sound waves

Question 4187:

• WAEC 2019

A loaded spring is set in simple harmonic motion. The force that tends to restore the load to its equilibrium position is

A. Adhesive
B. Elastic
C. Frictional
D. Gravitational

Question 4188:

• WAEC 2019

Which of the following cases cannot produce total internal reflection? A light ray travelling from

A. Glass to water
B. Kerosene to air
C. Air to water
D. Water to ice

Question 4189:

• WAEC 2019

The vacuum in a thermoflask reduces heat loss resulting from

A. Radiation only
B. Conduction and convection only
C. Radiation and convection only
D. Conduction only

Question 4190:

• WAEC 2019

The diagram above represents an experimental set-up for verifying

A. Lens formula
B. Refraction laws
C. Reflection laws
D. Mirror formula