Common Mechanical Comprehension Practice Test 1

Question – 1

1. When an object is moved using casters or bearings,

A. rolling friction is converted to sliding friction
B. sliding friction is converted to rolling friction
C. the object is difficult to move
D. no friction occurs
Answer:B
Answer Explanation:

Question – 2

2. When water flows from a 3-inch pipe to a 1-inch pipe,

A. pressure in the 3-inch pipe decreases
B. pressure in the 1-inch pipe increases
C. more water flows through the1-inch pipe than the 3-inch pipe
D. no change occurs in the amount of water passing through the pipes
Answer:D
Answer Explanation:

Question – 3

3. A tank has a base of 4ft x 8ft and holds 3200 pounds of water. The water pressure at the base of the tank will be

A. 400 lb/ft²
B. 200 lb/ft²
C. 600 lb/ft²
D. 100 lb/ft²
Answer:D
Answer Explanation:
4ft x 8ft = 32ft²
3200/32= 100 lb/ft²

Question – 4

4. If the speed of a liquid increases, its pressure __________.

A. increases
B. decreases
C. remains constant
D. increases initially and then gradually decreases
Answer:B
Answer Explanation:

Question – 5

5. When two pulleys are connected by a belt, they will run at same speed only if they are ________.

A. of the same size
B. of different sizes
C. large in size
D. small in size
Answer:A
Answer Explanation:

Question – 6

6. There are 2 pulleys A and B of diameters 18 inch and 6 inch respectively. If pulley A rotates at a speed of 2400 rpm, what will be the speed of pulley B?

A. 3600 rpm
B. 2400 rpm
C. 7200 rpm
D. None of the above
Answer:C
Answer Explanation:
speed_A x diameter_A = speed_B x diameter_B
2400 x 18 = speed_B x 6
speed_B= 2400 x 3 = 7200 rpm.

Question – 7

7. In a system of gears, there are 2 gears having 12 teeth and 36 teeth respectively. If gear A rotates 6 times, how many rotations will gear B make?

A. 12
B. 24
C. 2
D. 6
Answer:C
Answer Explanation:
The ratio of teeth on gears A and B is 12:36 or 1:3
Gear A must rotate 3 times to make gear B rotate once. Therefore, if gear A rotates 6 times, then the gear B will rotate twice.

Question – 8

8. A gas _________ when it is compressed.

A. warms up
B. cools down
C. remains of the same temperature
D. initially warms up and then gradually cools down
Answer:A
Answer Explanation:

Question – 9

9. Triangular shapes are used for constructing bridges because _________.

A. they are easy to manufacture
B. they are flexible
C. they are attractive
D. triangles are sturdier than any other shapes
Answer:D
Answer Explanation:

Question – 10

10. An effort arm of length 10 feet and a resistance arm of length 5 feet are used in a first-class lever. The mechanical advantage is ________.

A. 5
B. 15
C. 2
D. 50
Answer:C
Answer Explanation:

Question – 11

11. ________ is an alloy of copper and steel.

A. Brass
B. Bronze
C. Aluminium
D. Nickel
Answer:A
Answer Explanation:

Question – 12

12. Steel has a lower critical point of ________.

A. 623^oC
B. 723^oC
C. 823^oC
D. 923^oC
Answer:B
Answer Explanation:

Question – 13

13. If a material is ________ it can easily break with little distortion.

A. ductile
B. malleable
C. brittle
D. durable
Answer:C
Answer Explanation:

Question – 14

14. _________ space lattice is found in gamma-iron.

A. Body centred cubic
B. Face centred cubic
C. Hexagonal
D. Triclinic
Answer:B
Answer Explanation:

Question – 15

15. Dead mild steel contains ______ of carbon.

A. 15%
B. 1.5%
C. 2%
D. 0.15%
Answer:D
Answer Explanation:

Common Mechanical Comprehension Practice Test 1

Score: 0/10

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