Acids, Bases and Salts Sample Questions for Class 7
Question 1
The twisted shape of DNA is a
A. double ladder.
B. double helix.
C. nucleotide.
D. base pair.
Question 2
Which of the following has the greatest concentration of hydroxide ions?
A. 8
B. 10
C. 9
D. 8.1
Question 3
Bleach is a
A. weak acid.
B. weak base.
C. strong acid.
D. strong base.
Question 4
Which planet is known as the "Red Planet"?
A. Earth
B. Mars
C. Uranus
D. Venus
Question 5
DNA is an acronym for
A. deoxynitrogenous acid.
B. decomponutrient acid.
C. deoxyribonucleic acid.
D. dinoribonucleic acid.