Explanation

Gamma rays are the highest energy photons, with energies typically above 100,000 electronvolts (eV).

They are a type of electromagnetic radiation, like X-rays and visible light, but with much shorter wavelengths and higher frequencies.

Explanation

A pinhole camera works without lenses.

It uses a small aperture (pinhole) to project an inverted image of the scene onto the opposite surface.

Explanation

James Watson is an American molecular biologist, geneticist, and zoologist.

In 1953, he co-authored with Francis Crick the academic paper proposing the double helix structure of the DNA molecule. 

ND13-07-2023

Explanation

Organic chemistry is the branch of chemistry that focuses on the structure, properties, composition, reactions, and preparation of compounds containing carbon.

While many organic compounds also contain hydrogen, oxygen, nitrogen, and other elements,

The defining element in organic chemistry is carbon.

Explanation

Zoology, branch of biology that studies the members of the animal kingdom and animal life in general.

Explanation

A capacitor is a passive two-terminal electrical component that can store energy in an electric field electrostatically.

Explanation

Mercury is used as a thermometric fluid because it has several ideal properties:

1. High Boiling Point (B.P)

   • Mercury doesn't evaporate easily, which makes it suitable for measuring high temperatures.

2. Low Freezing Point (not high M.P)

   • Mercury has a low melting point (−38.83°C), which helps in measuring low temperatures, though this limits it in very cold environments.

3. Stable and Uniform Coefficient of Expansion

   • Mercury expands uniformly with temperature, which gives accurate and consistent readings.

4. Visibility and Non-wettability

   • Mercury is shiny and opaque, so it's easy to see in a glass tube.

   • It doesn't stick to glass, which keeps the readings clean and precise.

Explanation

Scotograph is an instrument used for aiding the blind to write.

It helps visually impaired individuals in forming letters and words by providing a tactile guide.

Explanation

The principal methods of measuring hospital performance are:

• regulatory inspection
• public satisfaction surveys
• third-party assessment
• and statistical indicators

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ND1-2-2023

Explanation

The guitar is a musical instrument of the chordophone family.

The standard guitar has following six strings:

1. E

2. A

3. D

4. G

5. B

6. E