1
NDA General Ability 16 April 2023
MCQ (Single Correct Answer)
+4
-1.33
Change Language
An iron nail dipped in copper sulphate solution turns brown. This is due to which one of the following types of reactions?
A
Addition reaction
B
Decomposition reaction
C
Substitution reaction
D
Displacement reaction
2
NDA General Ability 16 April 2023
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Among the following, which is not the correct method for keeping the curd?
A
Keeping in stainless steel vessel
B
Keeping in copper vessel
C
Keeping in plastic vessel
D
Keeping in glass vessel
3
NDA General Ability 16 April 2023
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Toothpaste prevents tooth decay by:
A
neutralizing the excess acidity.
B
means of emulsification.
C
the action of fluoride.
D
making a coat of calcium over the teeth surface.
4
NDA General Ability 16 April 2023
MCQ (Single Correct Answer)
+4
-1.33
Change Language

A rectangle ABCD is kept in front of a concave mirror of focal length f with its corners A and B being, respectively, at distances 2f and 3f from the mirror with AB along the principal axis as shown in the figure. It forms an image A'B'C'D' in front of the mirror. What is the ratio of B'C' to A'D'?

NDA General Ability 16 April 2023 General Science - Physics Question 118 English

A
1
B
2
C
$\frac{1}{2}$
D
$\frac{2}{3}$
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