Simple Machines Test

Result

Simple Machines Test - 1

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Question 1
1 / -0

Why lubrication is required time to time in the machines?

A
It increases the grip between the surfaces.

B
It increases the friction between the surfaces.

C
It decreases the friction between the surfaces.

D
It cleans the surface of the machine.

Solution

Lubrication is required in the machines because it decreases the friction between the surfaces and thus reduces the possibility of the wear and tear of the machine due to friction.
Question 2
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Which of the following is not a lever of first order?

A
Pair of tongs

B
Seesaw

C
Beam balance

D
Crowbar

Solution

In the levers of first order, the fulcrum is situated between the load in the effort. In the pair of tongs, the effort is situated between the load and the fulcrum so, it is not a lever of first order.
Question 3
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Which of the following simple machines is not an example of wheel and axel?

A
Needle

B
Door knob

C
Wind mill

D
Pencil sharpener

Solution

Wheel and axel comprise a wheel and a rod (axel) that passes through the centre of the wheel. The wheel is attached to the rod in such a way that when we turn the wheel, the axle also turns. A door knob, a wind mill and a pencil sharpener are examples of wheel and axel; however, a needle is an example of a wedge.
Question 4
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What does it mean when we say that the efficiency of an ideal machine is 100%?

A
The output energy is greater than input energy.

B
The output energy is equal to the input energy.

C
The output energy is less than the input energy.

D
The output energy is 100 times the input energy.

Solution

The efficiency of an ideal machine is 100% means that the output energy of the machine is equal to the input energy, i.e., there is no loss of energy.
Question 5
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Use the following information to answer the next question.

The given figure shows a mechanical tool. It works on the principle of leverage.

The given mechanical tool is used to

A
fix objects

B
cut objects

C
hold objects

D
connect objects

Solution

Levers are used to make a task easier. The given figure shows a tong. It is a lever. When effort is applied in the middle, both the horizontal bars of the tong turn about the connected end, and a load acts at its opening. An object can be held between the openings of the tong.