Mass vs Weight

Q. Weight of the block will be.

1. constant
2. increasing
3. decreasing
4. none of these

Q. Three weights W, 2W and 2W are connected to identical springs suspended form rigid lkhorizontal rod. The assembly of the rod and the weights fall freely. The positions of the weights from the rod are such that

1. 3W will be farthest
2. W will be farthest
3. All will be at the same distance
4. 2 W will be farthest

Q.

A man of mass M stands on a weighing machine in an elevator accelerating upwards with an acceleration $a_0$ . Calculate the reading of the weighing machine

1. Mg

2. M(g+a)

3. M(g-a)

4. Zero

Q. A body weighs 8 gm, when placed in one pan and 18gm, when placed in the other pan of a false balance. The beam is horizontal (when both the pans are empty), the true weight of the body is

1. 13 gm
2. 12 gm
3. 15 gm
4. 15.5 gm

Q. A man of mass $m$ is standing on weighing machine in an elevator accelerating upwards with an acceleration $a$. What will be the reading of weighing machine?

1. $m(g-a)\text{N}$
2. $m(g+a)\text{N}$
3. $\frac{m}{(g-a)}\text{N}$
4. $\frac{m}{(g+a)}\text{N}$

Q. A man of mass $m$ is standing on weighing machine in an elevator accelerating upwards with an acceleration $a$. What will be the reading of weighing machine?

1. $m(g-a)\text{N}$
2. $m(g+a)\text{N}$
3. $\frac{m}{(g-a)}\text{N}$
4. $\frac{m}{(g+a)}\text{N}$

Q. A rod AB of weight $W_1$ is placed over a sphere of weight $W_2$ as shown in the figure. If friction is absent, the number of forces to be shown on the sphere in its FBD is/are?

1. 3
2. 4
3. 5
4. 6