NDA General Ability 16 April 2023 | Chemistry Question 191 | General Science

General Science

Physics

Chemistry

Biology

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.

NDA General Ability 16 April 2023

MCQ (Single Correct Answer)

-1.33

Mica is mainly used in:

food and beverage industry.

iron and steel industry.

aluminium industry.

electrical and electronic industries.

NDA General Ability 16 April 2023

MCQ (Single Correct Answer)

-1.33

What is the specific purpose of using potassium hydroxide during the saponification process?

To obtain soaps which are hard on the skin

To obtain soaps which are soft on the skin

To obtain natural fragrance

To make the saponification very economical

NDA General Ability 16 April 2023

MCQ (Single Correct Answer)

-1.33

Which one of the following is the correct arrangement of metals in the decreasing order of their reactivity?

Iron, Sodium, Silver, Copper

Silver, Copper, Iron, Sodium

Sodium, Copper, Silver, Iron

Sodium, Iron, Copper, Silver

Questions Asked from Marks 4