A lift is on the ground floor. If it goes 5 floors down and then moves up 10 floor from there, then in which floor will the lift be?

An elevator is on the twentieth floor. It goes down 11 floors and then up 5 floors. What floor is the elevator on now?

In a three-storey building, there are four rooms on the ground floor, two on the first and two on the second floor. If the rooms are to be allotted to six persons, one person occupying one room only, the number of ways in which this can be done so that no floor remains empty is a. "^8P_6-2(6!) b. "^8P_6 c. "^8P_5(6!) d. none of these

Five persons entered the lift cabin on the ground floor of an 8-floor house. Suppose that each of them independently and with equal probability can leave the cabin at any floor beginning with the first. Find out the probability of all five persons leaving at different floors.

A metre stick is is held verticaly with one end on a rough horizontal floor. It is gently alowed to fal on the floor. Assuming that the end ast the floor does not slip find the angular speed of the rod when it hits the floor.

A person standing oin the floor of an elevator drops as coin. The coin reaches the floor of the elevator in a time t_1 if the elevator is stationary and in the t_2 if it is moving uniformly. Then

A uniform chain of mass M and length L is held verticallyi in such a way that its lower end just touches the horizontal floor. The chain is released from rest in this position. Any portion that strikes the floor comes to rest. Assuming that the chain does not form a heap on the floor, calculate the force exerted by it on the floor when a length x has reached the floor.

A boy of mass M is applying a horizontal force to slide a box of mass M on a rough horizontal surface. The the floor is mu and the between the box and the floor is mu' . In which of the following cases it is certainly not possible to slide the box?