Quiz Questions 13 February 2023

Explanation:   From Gujarat to Arunachal Pradesh there is a time lag of two hours. Hence, time along the Standard Meridian of India (82°30’E) passing through Mirzapur (in Uttar Pradesh) is taken as the standard time for the whole country. The latitudinal extent influences the duration of the day and night, as one moves from south to north.

Explanation:

 

An Isochrone is defined as “a line drawn on a map connecting points at which something occurs or arrives at the same time”.

Explanation:

 

The earth rotates from west to east, so every 15° we go eastwards, local time is advanced by 1 hour.

Hence, statement 1 is not correct.

Conversely, if we go westwards, local time is retarded by 1 hour.

Hence, statement 2 is not correct.

Also, it can be concluded that places east of Greenwich see the sun earlier and gain time, whereas places west of Greenwich see the sun later and lose time.

Hence, statement 3 is correct.

Explanation:

 

An atomic clock at National Physical Laboratory (NPL) in New Delhi added ‘leap second’ (extra one second) to the Indian Standard Time (IST) on 1 January 2017 to synchronise with the Earth’s rotational clock.

The clock was programmed to add an extra second to the year 2017 in order to compensate for a slowdown in the Earth’s rotation.

• The Earth and rotation around its own axis is not regular, as sometimes slows down and sometimes speeds up due to various factors, including moon’s gravitational forces and earthquakes
• As a result, astronomical time (UT1) gradually falls out of sync with atomic time (UTC)

When the difference between UTC and UT1 approaches 0.9 seconds, a leap second is added to UTC through atomic clocks worldwide to match both times.

• This one second shift is critical for applications requiring time accuracies in the nanosecond scale, which are critical in the fields of astronomy, satellite navigation, communication networks etc.

Explanation:

 

Statement 1 is correct.

Established on September 1, 1947, IST corresponds to the time schedule along the 82.5°E longitude near Mirzapur in Uttar Pradesh.

States located to the west of this longitude have more daylight hours compared to those in the east.

Indian Standard Time is five and a half hours ahead of UTC / GMT. Tropic of cancer and IST meridian intersect at Koriya district in Chhattisgarh

Statement 2 is correct.

The Sri Lanka Time reverted on 15 April 2006 to match Indian Standard Time calculated from the Allahabad Observatory in India 82.5 ° longitude East of Greenwich, the reference point for GMT

Statement 3 is not correct.

India has no official Daylight Saving Time (DST) although the country spans more than 2000 Km East to West.

Some of the North eastern states have a different ‘Tea Garden Time’ to save Daylight. Chaibagaan or bagaan time was set one hour ahead of IST for tea estates, collieries and oil industry of Assam. Most tea estates still follow this time, so does the 112-year-old Digboi Refinery in eastern Assam.

Explanation:

 

Statement 1 is correct.

An Atomic clock is the most accurate type of clock which is regulated by the vibrations of an atomic or molecular system such as caesium or ammonia.

The principle of operation of an atomic clock is based on atomic physics; it uses the microwave signal that electrons in atoms emit when they change energy levels.

Atomic physics is the field of physics that studies atoms as an isolated system of electrons and an atomic nucleus.

It is primarily concerned with the arrangement of electrons around the nucleus and the processes by which these arrangements change.

 

Statement 2 is correct.

They provide accurate time and frequency standards and are used as primary standards for international time distribution services, to control the wave frequency of television broadcasts, and in global navigation satellite systems such as GPS.

 

Recently three atomic clocks onboard a single satellite of the NAVIC Indian regional navigation satellite system have failed and efforts are being taken to rectify/replace the clocks.

Explanation:

 

A solar day is nearly 4 minutes longer than a sidereal day. The mean solar day at present is 86400.002 seconds, It was 86400 in 1820

Explanation:

 

A time zone represents a geographic area. All the clocks in a given time zone have the same time being shown. That same time is often called as STANDARD TIME.

Many countries like USA & Russia have more than one time zone because these countries are so much big in terms of the width that having one common time zone will not work for them.

Daylight Saving is a procedure in which the time in the clock is adjusted forward in spring & is readjusted backward in autumn

Locations farther east inside the time zone benefit more from DST than locations farther west in the same time zone.