Which standard time does India have?

Which of the following statements is/are correct concerning Time Zone in India?

$1.$There is one standard time for the whole country.
$2.$ Andaman and Nicobar Islands and Lakshadweep Islands have different Time Zones.
$3.$ Indian Standard Time (IST) is five and a half hours behind GMT.

Select the correct answer using the code given below :

Democracy is based on a fundamental principle of _____

The Indian Standard Time is ahead of GMT by _____.

Types of Clocks Based on Working Mechanism.

In kitchen applications a piezoelectric crystal is used for _____ (lighting a gas stove/ opening a refrigerator).

The piezo- electric transducer cannot measure