Melanin is the natural pigment that gives colour to human skin, h

Subject

General Knowledge

Class

NDA Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

The Kashmir region receives additional amount of precipitation during the winter brought by:

  • South-west Monsoon

  • Western Disturbances

  • Retreating Monsoon

  • Temperate Cyclone


12.

Which part of India has the Kalakot tertiary coal field?

  • Brahmaputra river basin of Assam

  • Damodar river basin ofJharkhand and West Bengal

  • Himalayan mountain region

  • Cardamom hills in Kerala


13.

Tendons through which muscles are connected to bones are tightly compacted bundles of which one of the following long fibrous protein?

  • Fibrin

  • Collagen

  • Elastin

  • Cellulose


14.

Which one of the following is the scientific name of the causal organism of elephantiasis?

  • Ascaris lumbricoides

  • Culex pipiens

  • Wuchereria bancrofti

  • Fasciola hepatica


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15.

Melanin is the natural pigment that gives colour to human skin, hair and the iris. It provides protection against:

  • Ultraviolet radiation

  • Infrared radiation

  • X-ray radiation

  • Short wave radio radiation


A.

Ultraviolet radiation

Melanin is a broad term for a group of natural pigments found in most organisms. Melanin is produced by the oxidation of the amino acid tyrosine, followed by polymerization. The melanin pigments are produced in a specialized group of cells known as melanocytes.


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16.

Intake of which one of the following food components should be minimized by patients having Gouty Arthritis due to elevated serum uric acid level?

  • Food fibres

  • Nucleic acids

  • Lipids

  • Carbohydrates


17.

Which one of the following statements about microbes is not correct?

  • They are used in sewage treatment plants.

  • They are used in industrial fermenters for the production of beverages.

  • No antibiotic has been obtained from any microbe.

  • They are used to get many bioactive molecules for the treatment of diseases.


18.

Golden rice is a genetically-modified crop plant where the incorporated gene is meant for biosynthesis of:

  • Omega-3 fatty acids

  • Vitamin A

  • Vitamin B

  • Vitamin C


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19.

An object moves in a circular path with a constant speed. Which one of the following statements is correct?

  • The centripetal acceleration of the object is smaller for a gentle curve (i.e., curve of larger radius) than that for a sharp curve (i.e., curve of smaller radius).

  • The centripetal acceleration is greater for a gentle curve than that for a sharp curve.

  • The centripetal acceleration is the same for both, the gentle and sharp curves.

  • The centripetal acceleration causes the object to slow-down.


20.

The force acting on a particle of mass m moving along the x-axis is given by F(x) = Ax2 - Bx. Which one of the following is the potential energy of the particle?

  • 2Ax - B

  • -x262Ax - 3B

  • Ax3Bx2

  • Zero


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