Machine

Q.

Which simple machine is used by the laborers to load heavy barrels, etc., on a truck?

Q.

A door opening around a fixed hinge is an example of _________ (moment / pressure ).

Q.

If impulse = force x time and S.I. unit of force is newton (N), then S.I. unit of impulse is __________.

Q.

A machine is a device which can either overcome a large resistive force (or load) at some point by applying a small force (or effort) or by which we can obtain a gain in speed.

1. True

2. False

Q.

It is the easiest to open a closed door by applying force at the edge of the door.

Q. Which of the following spanner gives maximum couple for a given force applied?

1. Spanner a
2. Spanner d
3. Spanner c
4. Spanner b

Q.

Name a machine which is responsible for changing the point of application of force.

1. Screw

2. Scissors

3. Wheel

4. Wedge

Q. In the figure given below, the magnitude of normal reaction exerted by the floor on the 50 kg block is [The string and pulley are massless and all the surfaces are smooth] [Take $g=10m/s^2$]

1. 200 N
2. 300 N
3. 700 N
4. 500 N

Q.

Which of the following option is correct?

1. For an ideal machine, the work done by the machine is always equal to the work done on it.

2. For an ideal machine, the work done by the machine is always greater than the work done on it.

3. For an ideal machine, the work done by the machine is always less than the work done on it.

4. For an ideal machine, the work done by the machine is never equal to the work done on it.

Q.

Which statement is not true for a simple machine?

1. It makes work easy

2. It multiplies force

3. It saves energy

4. It saves time