531.combining of two nonmetal atoms by sharing one more pairs of electron is called?
A.ionic bond
B.covalent bond *
C.metal bond
D.none of these
532. Which method may not be considered as a food preservation method?
A.freezing
B.irradiations
C.sleeping *
D.none of these
533. What does RNA stand for?
A.ribonucleic acid *
B.russian national assembly
C.red nitric acid
D.none of these
534. Deficiency of iron in the human diet causes?
A.hepatitis
B.malaria
C.anemia *
D.none of these
535. Which of the following cannot be considered as a renewable source of energy?
A.petroleum *
B.wind
C.solar
D.none of these
536. Which of the following is not a part of quantities used to discuss computer memory?
A.bite *
B.bit
C.byte
D.none of these
536. Which of the following may be said be the most harmful radiation emitted by the sun?
A.infra-red
B.visible light
C.ultra-violet *
D.none of these
537. Which of the following may be considered as a factor having influence on intelligence?
A.hereditary *
B.dressing
C.smilihg
D.none of these
538. Which one is not a part of cell phone structure?
A.LCD
B.battery
C.water *
D.none of these
539. ____ advocate that the students be free to choose how and what they study
A. existentialism *
B. pragmatism
C. realism
D.idealism
540. John deveey said that education is a purely ______ process
A. friendly
B.common
C.Mental
D.social *