The Queen and the Duke of Edinburgh observed the silence as they visited the University of Strathclyde's Technology and Innovation Centre.
Friends and family are gathering at St Barnabas Church in Barnetby for a service to remember Tunisia victim Claire Windass.
Claire, who was 54, was born and grew up in Barnetby and then lived in Scunthorpe for 35 years, before moving to Hull in 2012 after getting married.
A minute's silence will be held across the UK today to honour the people killed in the Tunisian beach attack a week ago.
Thirty-eight people - including 30 Britons - were killed when gunman Seifeddine Rezgui opened fire in the resort of Sousse. Among them were Carly Lovett from Gainsborough, Claire Windass from Hull, Bruce Wilkinson from Goole, John Stollery from Newark and Christopher and Sharon Bell from Leeds.
The Queen and David Cameron will be among those to join the silence.
Emergency services are at the scene of an accident near Grantham in which a cyclist has received serious head injuries.
The collision between the male cyclist and a car happened at around 8.25am on on Sand Lane at Marston. He has been flown to the Queens Medical Centre in Nottingham. The road is likely to remain closed for some time. Any witnesses area asked to contact police.
David Cameron has confirmed he will be "joining millions" in remembering the victims of the Tunisia beach atrocity in a minute's silence later today.
At midday I'll be joining millions stopping for a minute to remember the people murdered in Tunisia last week.
The Number 10 Twitter account has changed its profile picture to honour the victims of the Tunisia attack ahead of a national minute's silence at midday.
Leeds Rhinos have been given a major boost ahead of tonight’s First Utility Super League clash with St Helens with the news that England international Zak Hardaker has agreed a new four year contract with the club that will keep him at Headingley Carnegie until at least the end of the 2019 season.
Hardaker, who made his debut for the Rhinos back in 2011, has pledged his future to the club and the Super League competition. He has now made 124 appearances for the club since joining from Featherstone Rovers and last week scored his 60th try in the crucial Ladbrokes Challenge Cup Quarter Final win at Hull FC.
“I am really pleased to have signed the new deal. I would like to say thank you to Gary Hetherington for the faith he has shown in me and also the club’s supporters, especially our members who every year show their support for the team and certainly were a big part in why I have committed my future to the club.
“Over the last decade, the fans have been used to a team that grew up together with Kevin Sinfield, Danny McGuire, Rob Burrow and Jamie Jones-Buchanan but obviously things are going to change over the next few years but there is a group of young players here now who want to follow in their footsteps and make our own history here with the Rhinos. It is a really exciting time to be at the club and I am looking forward to the future and achieving more success over the years ahead.”
“I am really pleased for Zak himself that he has agreed this new contract and committed his future to the club and our competition. Zak has had some well publicised ups and downs in his career but there is no doubting his ability on the field. His work ethic and commitment on and off the field this season cannot be questioned and I think over the next few years he will mature into a world class player.
“It should not be underestimated how big an achievement it is by the club to keep the likes of Zak, Kallum Watkins, Ryan Hall, Joel Moon and Tom Briscoe at our club on long term contracts. Our members and the fanbase are a huge part of that, the support the players get creates a bond between the players and the club, a bond that is very hard to break and makes staying at this club a great option for all our players."
A national minute's silence will be held at midday in memory of 30 Britons killed in an attack on a beach in Tunisia last week.
Thirty-eight people in total died when a gunman opened fire at the coastal resort in Sousse. The gunman was killed by Tunisian police and 12 people have been arrested in connection with the attack
Flags have been lowered to half-mast at Downing Street and Buckingham Palace ahead of a one minute's silence for the victims of the Tunisia terror attack at midday today.
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