Test : General Science - 10 - NDA MCQ

Cowper’s gland is related with reproductive system. Cowper’s gland is the bulbourethral gland found in human males. They are found in pair and secrete viscous secretion called pre ejaculate that helps in coitus.

Cloves are the flower buds of a tree in the family Myrtaceae. The tree is evergreen growing, contains large leaves and flowers grouped in terminal clusters. 

Rhizobium (a kind of bacteria) lives in plant roots of pulse plant (legumes) to fix nitrogen.

Asthma is a chronic lung disease. It inflames and narrows the air ways. Tuberculosis is a lung disease created by Mycobacterium tuberculosis. Workers in textile factories and carpet manufacturing units are the common suffers of asthma and tuberculosis.

Deficiency of vitamin-A (retinol) creates night blindness. It also creates keratomalacia, xerosis cornea and Bitot’s spot. High content of vitamin-A is obtained from Bitot’s spot. High content of vitamin-A is obtained from liver and butter.

Iodine is a powerful antiseptic. It is used as a tincture of iodine which is 2-3% iodine solution in alcohol water.

A chemical change a new substance is formed. During crystallization of table salt from sea water no new substance is formed hence, it is not a chemical change.

Addition of water to an aqueous solution of HCI decreases the pH because on dilution the number of H^+ ions (from water) increases. Now since [H+ ]=(10)^(-pH)∴As [H^+] increases pH decreases.

Fluorescent coating on the glass is the secondary source of light in a fluorescent lamp.

Setting of plaster of Paris is the hydration leading to another hydrate i.e., gypsum.

Potassium ions (K^+) are responsible for protein synthesis, opening and closing of stomata in plants. 

Colour temperature is a measurement relating the colour of the light radiated by an object to its temperature. No matter whatever the temperature is the hottest would only radiate to blue-white light radiation. 

Airbag used for safety and protection of car driver possesses sodium azide. 

Horizontal range R = (u^2  sin⁡2θ)/g

For maximum horizontal range, θ should be 45°

R_max=u^2/g[∵sin⁡(2θ=sin⁡ (90°=1)]  

By the relation in different temperature scales 

(C-0)/5=(F-32)/9=(K-273)/5=(R-0)/4 

We can calculate that temperature which differ by 10° on the Fahrenheit scale. 

Diffraction pattern becomes narrower and crowded together.

Raw mangoes shrivel when pickled in brine due to osmosis i.e. flow of water from higher concentration to lower concentration through a semi-permeable membrane. 

When a body immersed in a liquid, then the apparent weight of the body depends upon the densities of the liquids and volume of the portion of the solid immersed in liquid. So, the apparent weight of a steel sphere will be greatest for the liquid with the smallest density.

Benzene (C_6 H_6 ) is casue of bone marrow failure.

Somatotrophin is produced by the anterior pituitary. It is a peptide hormone that induces growth, cell reproduction and regeneration.