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1
NDA General Ability 16 April 2023
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which one of the following statements about X-rays is not true?
A
They have wavelengths of about 1 Å.
B
These can be generated by bombarding a metal target by high energy electrons.
C
Due to their wavelengths being shorter, these can be used for radar systems.
D
These are also used for the treatment of certain forms of cancer.
2
NDA General Ability 16 April 2023
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Mica is mainly used in:
A
food and beverage industry.
B
iron and steel industry.
C
aluminium industry.
D
electrical and electronic industries.
3
NDA General Ability 16 April 2023
MCQ (Single Correct Answer)
+4
-1.33
Change Language
What is the specific purpose of using potassium hydroxide during the saponification process?
A
To obtain soaps which are hard on the skin
B
To obtain soaps which are soft on the skin
C
To obtain natural fragrance
D
To make the saponification very economical
4
NDA General Ability 16 April 2023
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which one of the following is the correct arrangement of metals in the decreasing order of their reactivity?
A
Iron, Sodium, Silver, Copper
B
Silver, Copper, Iron, Sodium
C
Sodium, Copper, Silver, Iron
D
Sodium, Iron, Copper, Silver
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