1.

Biodiversity forms the basis for human existence in the following ways:

1. Soil formation

2. Prevention of soil erosion

3. Recycling of waste

4.Pollination of crops

Select the correct answer:

A

1, 2 and 3

B

2, 3 and 4

C

1 and 4

D

1, 2, 3 and 4

E

Answer

D

Instruction

Solution

Biodiversity is fundamental to human survival because it underpins essential ecosystem functions: soil is formed and kept in place, waste is recycled back into nutrients, and crops are pollinated for food production.

PYQ

Yes

2.

What is the difference between Bluetooth and Wi-Fi devices?

A

Bluetooth uses 2.4 GHz radio frequency band whereas Wi-Fi can use 2.4 GHz or 5 GHz frequency band.

B

Bluetooth is used for Wireless Local Area Networks (WLAN) only, whereas Wi-Fi is used for Wireless Wide Area Networks (WWAN) only.

C

When information is transmitted between two devices using Bluetooth technology, the devices have to be in the line of sight of each other, but when Wi-Fi technology is used the devices need not be in the line of sight.

D

Both (a) and (b) are correct

E

Answer

A

Instruction

Solution

The key difference is the frequency bands they use: Bluetooth uses only the 2.4 GHz band, while Wi-Fi can utilize 2.4 GHz, 5 GHz, and even 6 GHz bands for faster data transfer.

PYQ

Yes