Basic Quiz – 23rd September 2026 | Science & Tech

Answer: (a) 1 and 3 only

Explanation:
NFC is a short-range wireless communication technology that usually works over a distance of only a few centimetres. It generally consumes less power than Bluetooth, especially for simple contactless communication.

Statement 1 is correct. NFC generally requires lower power compared to Bluetooth.

Statement 2 is incorrect. Bluetooth usually offers a higher data-transfer speed than NFC.

Statement 3 is correct. Bluetooth generally works over a much longer distance, while NFC typically operates within about 4 to 10 cm.

Answer: (a) Only one

Explanation:
Statement 1 is correct. Bryophytes are often called the amphibians of the plant kingdom because they can live on land but require water for sexual reproduction.

Statement 2 is incorrect. Bryophytes generally occur in moist, humid and shaded environments rather than dry and desert regions.

Statement 3 is incorrect. The plant body of bryophytes is generally more differentiated than that of algae. Bryophytes may possess structures resembling stems, leaves and roots, although they do not have true vascular tissues.

Answer: (c) Statement-I is correct, but Statement-II is incorrect

Explanation:
A speed gun is an electronic device used to measure the speed of a moving object without physical contact. It is commonly used by traffic police and in sports.

Statement-I is correct because the device measures speed remotely.

Statement-II is incorrect because conventional speed guns work using electromagnetic waves and the Doppler effect, not necessarily artificial intelligence-based sensors.

The Doppler effect refers to the apparent change in frequency of a wave due to relative motion between the source and the observer.

Answer: (d) Neither 1 nor 2

Explanation:
Statement 1 is correct. The term junk DNA has traditionally been used for DNA sequences that do not code for proteins. Only a small proportion of the human genome directly codes for proteins.

Statement 2 is also correct. Some non-coding DNA has important functions and can produce non-coding RNAs, including regulatory RNAs, transfer RNA and ribosomal RNA.

Therefore, neither statement is incorrect.

Answer: (d) 1, 2 and 3

Explanation:
Statement 1 is correct. Adsorption is a surface phenomenon in which molecules accumulate on the surface of a solid or liquid rather than entering its bulk.

Statement 2 is correct. Silica gel adsorbs water molecules from the surrounding air, which helps reduce moisture.

Statement 3 is correct. During adsorption, surface particles interact with the adsorbed molecules, reducing the residual surface forces and surface energy. Since adsorption lowers surface energy, it is generally an exothermic process.