SIFT Mechanical Comprehension 2

Question 1

What type of simple machine is a bottle opener?

Accepted Answer

Lever

Answer

Inclined plane

Answer

Wheel and axle

Answer

Pulley

Question 2

Two blocks, A (10 kg) and B (5 kg), rest on a frictionless surface connected by a string. If a 30 N force is applied to block A, what is the tension in the string?

Accepted Answer

10 N

Answer

5 N

Answer

15 N

Answer

30 N

Question 3

Which material has the highest thermal conductivity (transmits heat best)?

Accepted Answer

Copper

Answer

Wood

Answer

Glass

Answer

Rubber

Question 4

What is 'mechanical advantage' of a single fixed pulley?

Accepted Answer

1

Answer

0

Answer

2

Answer

4

Question 5

If both ends of a horizontal pipe carry equal and opposite compressive forces, the pipe is under what type of stress?

Accepted Answer

Compression

Answer

Tension

Answer

Shear

Answer

Torsion

Question 6

Water is flowing through a pipe. If the pipe splits into two equal branches, what happens to the flow speed in each branch (assuming incompressible flow)?

Accepted Answer

Flow speed halves in each branch

Answer

Flow speed doubles in each branch

Answer

Flow speed stays the same

Answer

Flow speed triples in each branch