NEET Practice Questions (MCQs) with Answers & Solutions

The NCERT clearly states under 'EXERCISES', '(a)You can shield a charge from electrical forces by putting it inside a hollow conductor. Can you shield a body from the gravitational influence of nearby matter by putting it inside a hollow sphere or by some other means ?' and later, 'Gravitational shielding is not possible.' This highlights the difference between gravitational and electrical forces in this regard.

From 'POINTS TO PONDER' (Point 1 on page 151): 'A satisfactory understanding of magnetic phenomenon in terms of moving charges/currents was arrived at after 1800 AD. But technological exploitation of the directional properties of magnets predates this scientific understanding by two thousand years.'

Referring to the 'POINTS TO PONDER' table (page 151), the unit for Magnetic intensity (H) is listed as A m$^{-1}$. Also, on page 146, it states that H is measured in units of A m$^{-1}$.

From 'POINTS TO PONDER' (Point 6 on page 152): 'Diamagnetism is universal. It is present in all materials. But it is weak and hard to detect if the substance is para- or ferromagnetic.'

According to the NCERT text, 'Vitamins which are soluble in fat and oils but insoluble in water are kept in this group. These are vitamins A, D, E and K. They are stored in liver and adipose (fat storing) tissues.' Vitamin A is a fat-soluble vitamin.

Table 10.3 explicitly states that 'Pernicious anaemia (RBC deficient in haemoglobin)' is a deficiency disease of Vitamin B12.

The NCERT text states, 'Water soluble vitamins must be supplied regularly in diet because they are readily excreted in urine and cannot be stored (except vitamin B12) in our body.' Fat-soluble vitamins (A, D, E, K) are stored in the body, not water-soluble ones.

Table 10.3 lists 'Xerophthalmia (hardening of cornea of eye)' as a deficiency disease of Vitamin A.

The text explains, 'The term “Vitamine” was coined from the word vital + amine since the earlier identified compounds had amino groups.'.

Table 10.3 clearly states 'Cheilosis (fissuring at corners of mouth and lips), digestive disorders and burning sensation of the skin' as symptoms of Vitamin B2 (Riboflavin) deficiency.