Daily NEET MCQ- March 30, 2022 - NEET MCQ

The withdrawal of the body part can be due to our contact with extremely hot or cold objects, pointed objects, animals that are scary, or are poisonous.

The efferent neurons carry the signals from the central nervous system to the effector organs. The stimulus and response thus form a reflex arc, for example; the knee jerk reflex.

The nose contains mucus coated receptors that are specialised for receiving the sense of smell and are called olfactory receptors. These are made up of olfactory epithelium.

The neurons of the olfactory epithelium extend from the outside environment directly into a pair of broad bean-sized organs, called olfactory bulb, which are extensions of the brain’s limbic system.

The coefficient of a refrigerator is defined as α = Q₂/W,
where Q₂ is heat extracted from a cold reservoir and W is work done.
α = 20/30 = 2/3.

Volume of drop = 4/3πR².
Let the radius of droplets be ‘r’. Volume of big drop will be equal to volume of 10 droplets.
10*4/3πr³ = 4/3πR³ ⇒ r = 10^1/3 *R.
Surface area of big drop = 4πR² & surface area of 10 droplets = 10 * 4πr² = 40πR²(10^2/3).
Surface energy of big drop = 4πR² *S = 4π(0.0025)*0.08 = 0.0025
Surface energy of droplets = 40πR²(10^2/3) *S = 40π(0.0025)(10^2/3)*0.08 = 0.1166.
Change in surface energy = 0.1166 – 0.0025 = 0.1141 J.

Systematic errors arise due to high use of the instrument. It can also be present because of careless handling.

Accuracy is the degree to which a value is near to the actual or standard value. Hence if the experimental value is very close to the actual value, the measurement can be called accurate.

Electrolytes which dissociate almost completely into constituent ions in aqueous solutions are known as strong electrolytes. Therefore ammonia is not a strong electrolyte because it can’t dissociate completely.

Aqueous solution of sugar does not conduct electricity, but Aqueous solution of sugar conducts electricity. This is because the aqueous solution of sugar is a nonelectrolyte, whereas the salt solution is an electrolyte.