Physics 2011 Jamb Past Questions and Answers

Question 16 :

• JAMB 2011

Which of the following electromagnetic waves has the highest frequency?

A. Utra - violet rays
B. Radio waves
C. X - rays
D. Infrared - rays

Question 17 :

• JAMB 2011

A perfect emitter or absorber of radiant energy is a

A. Conductor
B. Black body
C. White body
D. Red body

Question 18 :

• JAMB 2011

The ground is always cold at night because the

A. Atmosphere absorbs the sun's energy at night
B. Earth radiates heat to the atmosphere at night
C. Sun no longer shine at night
D. Atmosphere reflects the sun's energy at night

Question 19 :

• JAMB 2011

A cannon is fired from town X,after how long is the sound heard at a town Y 4.95 km away?
[velocity of sound in the air = 330 ms^-1]

A. 30 s
B. 10 s
C. 10 s
D. 15 s

Question 20 :

• JAMB 2011

The phenomenon that shows that increase in pressure lowers the melting point can be observed in

A. Sublimation
B. Condensation
C. Coagulation
D. Regelation