NDA General Ability 16 April 2023 | Chemistry Question 188 | General Science

General Science

Physics

Chemistry

Biology

NDA General Ability 16 April 2023

MCQ (Single Correct Answer)

-1.33

Which one of the following apparatus is used for separating benzene and water mixture?

Round bottom flask

Conical flask

Separating funnel

Dean and Stark apparatus

NDA General Ability 16 April 2023

MCQ (Single Correct Answer)

-1.33

An iron nail dipped in copper sulphate solution turns brown. This is due to which one of the following types of reactions?

Addition reaction

Decomposition reaction

Substitution reaction

Displacement reaction

NDA General Ability 16 April 2023

MCQ (Single Correct Answer)

-1.33

Toothpaste prevents tooth decay by:

neutralizing the excess acidity.

means of emulsification.

the action of fluoride.

making a coat of calcium over the teeth surface.

NDA General Ability 16 April 2023

MCQ (Single Correct Answer)

-1.33

Which one of the following statements about X-rays is not true?

They have wavelengths of about 1 Å.

These can be generated by bombarding a metal target by high energy electrons.

Due to their wavelengths being shorter, these can be used for radar systems.

These are also used for the treatment of certain forms of cancer.

Questions Asked from Marks 4