The big bang occurred
about_____billion year ago.
A) 15
B) 05
C) 8
D) 20
The speed of sound in iron or steel (at 20o C) is ________
A) 322 m/s
B) 3962 m/s
C) 1570 m/s
D) 5130 m/s
The primary color of
light are_______
A) Red, Green, Orange
B) Green, Blue, Orang
C) Red, Blue, Green
D) Yellow, Red, Green
The propose of ______ is to increase the like hood that children will engage in appropriate behavior.
A) Money
B) Education
C) Positive feedback
D) Correction
For teaching science, which method is more effective?
A) Lecture method
B) Discussion method
C) Project method
D) Demonstration
