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1

Consider the following statements :

1. In a seismograph, P waves are recorded earlier than S waves.
2. In P waves, the individual particles vibrate to and fro in the direction of wave propagation whereas in S waves, the particles vibrate up and down at right angles to the direction of wave propagation.

Which of the statements given above is/are correct?

2

Consider the following statements:

1. Other than those made by humans, nanoparticles do not exist in nature.
2. Nanoparticles of some metallic oxides are used in manufacture of some cosmetics
3. Nanoparticles of some commercial products which enter environment are unsafe for humans.

Which of the statements given above is/are correct?

3

With reference to Visible Light Communication (VLC) technology, which of the following
statements are correct?
(1) VLC uses electromagnetic spectrum wavelengths 375 to 780 nm.
(2) VLC is known as long-range optical wireless communication.
(3) VLC can transmit large amounts of data faster than Bluetooth,
(4) VLC has no electromagnetic interference.
Select the correct using the code given below:

4

Consider the following statements :
Statement-I : �
India, despite having uranium deposits, depends on coal for most of its electricity production.
Statement-II :
Uranium, enriched to the extent of at least 60%, is required for the production of electricity.

Which one of the following is correct in respect of the above statements?

5

Consider the following actions :

1. Detection of car crash/ collision which results in the deployment of airbags almost instantaneously
2 . Detection of accidental free fall of a laptop towards the ground which results in the immediate turning off of the hard drive
3. Detection of the tilt of the smartphone which results in the rotation of display between portrait and landscape mode

In how many of the above actions is the
function of accelerometer required?

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