IMSU Physics 2020/2021 Model Past Questions

Practice each question, then open it to see the full details.

Two lamps rated 40W and 220v, each are connected in series. The total power dissipated in both lamps is___

A.10W
B.20W
C.40W
D.80W
E.none

If PHCN charges 5K per kwh, what is the cost of operating for 24hours lamp requiring 1A on a 200V line.

A.24K
B.55K
C.40K
D.26K
E.32K

When a metal is heated to a high temperature, electrons are emitted from its surface. The process is known as __.

A.photoelectron
B.thermionic emission
C.field emission
D.secondary emission

An electric iron of resistance 20Ω takes a current 5A. Calculate the heat in Joule developed in 30s.

A.9.36 MJ
B.39.6 MJ
C.15 KJ
D.35 KJ

What is the critical angle for light passing from glass (n = 1.54) to water (n = 1.33)?

A.1.158°
B.0.864°
C.59.7°
D.2.05°