NEET Practice Questions (MCQs) with Answers & Solutions

The text (MAGNETISM_AND_MATTER, page 148, and page 152 summary point 5) explicitly states for a superconductor: '$\chi = -1$ and $\mu_r = 0$.'

The context (MAGNETISM_AND_MATTER, Figure 5.7 and accompanying text on page 147) states: 'Figure 5.7(a) shows a bar of diamagnetic material placed in an external magnetic field. The field lines are repelled or expelled and the field inside the material is reduced.'

While the text (The d - and f - Block Elements, page 102) states that for the first series transition metals the contribution of the orbital angular momentum is effectively quenched, Table 4.7 shows slight discrepancies between 'Calculated' and 'Observed' magnetic moments. These small differences are often attributed to the incomplete quenching of orbital angular momentum in some cases, or other complex interactions not accounted for by the simple 'spin-only' formula, which considers only spin contribution. The question from coordination compounds 5.7: '[Fe(H2O)6]3+ is strongly paramagnetic whereas [Fe(CN)6]3– is weakly paramagnetic. Explain.' highlights that environmental factors can influence magnetic properties.

The text (MAGNETISM_AND_MATTER, page 148, and page 152 summary point 6) states: 'Diamagnetism is present in all the substances. However, the effect is so weak in most cases that it gets shifted by other effects like paramagnetism, ferromagnetism, etc.' and 'Diamagnetism is universal. It is present in all materials. But it is weak and hard to detect if the substance is para- or ferromagnetic.'

The text explains (MAGNETISM_AND_MATTER, page 148): 'When magnetic field is applied, those electrons having orbital magnetic moment in the same direction slow down and those in the opposite direction speed up. This happens due to induced current in accordance with Lenz’s law...'

According to the NCERT text, 'These sequences normally do not code for any proteins, but they form a large portion of human genome.' Therefore, option o2 is incorrect.

The NCERT text states: 'As stated in the preceding section, 99.9 per cent of base sequence among humans is the same.'

The NCERT text explicitly mentions: 'The technique of DNA Fingerprinting was initially developed by Alec Jeffreys.'

The NCERT text states: 'The VNTR belongs to a class of satellite DNA referred to as mini-satellite.'

The context describes 'Souther n blot hybridisation using radiolabelled VNTR as a probe' and lists steps including isolation, digestion, separation, transferring, hybridisation, and detection. PCR amplification is not mentioned as part of the described technique.