Suspense

Examples of suspense
Imagine a scene in a film similar to this(classroom, students, teacher) . The camera reveals that there is a bomb under the table to the audience but we(students, teacher) are unaware of it

Sabotage
Verloc is a terrorist who is planning to plant a bomb at Picadilly Circus but because the police are after him he gets his wifes little brother to deliver the bomb.

Rope (1948)
Tells the story of two young wealthy men, Brandon and Philip, who strangle and murder a friend of theirs just to see if they can get awa with it.
Then the invite other close friends(including the murdered ans parents!) To their apartment or a dinner party, whilst hiding the body in a chest/box in their sitting room, just to see if they could get away with it.
The suspese is created through the body in the chest/box
Will the body(and the men) be bought to justice?
Do we the audience, even want his to happen.