Machines

Q.

Abacus was the first

1. Electronic computer

2. Mechanical computer

3. Electronic calculator

4. Mechanical calculator

Q.

Who is called the father of computer?

Q.

What is control word? Give the structure of a control word.

Q. What is a machine? Explain the differences between simple and complex machines.

Q.

A computer work on the principle of input output

Q.

(a) Define machine.

(b) Name six types of simple machines.

Q.

Name the first mechanical computer.

Q.

What is Backlash Error and Why is it Caused?

Q.

Write the uses of wedges.

Q.

Define complex machines.

Q. What is a wedge? Give two examples.

Q. A porter keeps a towel on his head to carry a load to _____.

1. minimise the pressure due to the load
2. balance the load
3. increase the pressure due to the load
4. reduce the pressure to zero due to the load

Q.

A force multiplier is a simple machine that multiplies the ___.

1. load

2. speed

3. effort

4. work

Q.

If the mechanical advantage is greater than $1$, this means that the machine is a _______.

Q.

What is the abstract noun of speak?

Q.

Define Machine.

Q. The efficiency of an ideal machine is______.

1. 100 %
2. 150 %
3. 50 %
4. 70 %

Q. Consider a coolie carrying a heavy load on his head but standing still, then _____ work is said to be done.

1. Negative
2. Positive
3. Zero
4. Either zero or positive

Q. A single fixed pulley helps in changing the ____ of force.

1. type
2. effect
3. direction
4. magnitude

Q.

What is the advantage of simple machine?

Q. Write the uses of the following simple machines:

1. Inclined plane
2. Wedge
3. Screw
4. Wheel and axle

Q.

The force applied to move an object by the lever is called ________ .

Q.

Which energy transformation takes place in the household mixer-grinder?

Q. A push or pull that can move an object is _____.

1. effort
2. load
3. energy
4. fulcrum

Q.

A falling raindrop has

1. only kinetic energy

2. only potential energy

3. both kinetic and potential energy

4. none of these

Q.

Classify the following simple machines :

(a) a railway signal

(b) A door knob

(c) A jack screw

(d) a staircase

(e) a bread knife

(f) a wheel barrow

Q.

Define the efficiency of a machine.

Q.

Which of the following are examples of simple machines?

1. Lever

2. Pulley

3. Inclined plane

4. engine

Q.

State the energy changes in the following case: a stone dropped from a cliff

Q.

Which among the following is an example of wheel and axle?

1. See-saw

2. Tongs

3. Car steering

4. Scissors