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Mechanical - 540 UNIT 3 Mass Weight Volume Density Speed - MCQ

26)   

SI unit of work is: 

A.
B.
C.
D.
Answer: C
27)   

Power is defined as: 

A.
B.
C.
D.
Answer: B
28)   

1 Horse Power =

A.
B.
C.
D.
Answer: C
29)   

Efficiency = 

A.
B.
C.
D.
Answer: A
30)   

 If input = 500 W and output = 400 W, what is the efficiency?

A.
B.
C.
D.
Answer: C
31)   

 BHP is always: 

A.
B.
C.
D.
Answer: C
32)   

Kinetic energy depends on:

A.
B.
C.
D.
Answer: B
33)   

Potential energy is: 

A.
B.
C.
D.
Answer: A
34)   

A 2 kg object at 10 m height has potential energy = ? (g = 10 m/s²)

A.
B.
C.
D.
Answer: A
35)   

The unit of power is: 

A.
B.
C.
D.
Answer: C
36)   

 Power is the rate of:

A.
B.
C.
D.
Answer: C
37)   

 An electric motor does 3000 J of work in 10 seconds. Power = ?

A.
B.
C.
D.
Answer: D
38)   

What is the efficiency of a machine that delivers 90 J from 120 J input?

A.
B.
C.
D.
Answer: B
39)   

The efficiency of an ideal machine is:

A.
B.
C.
D.
Answer: D
40)   

 Brake horsepower (BHP) is measured using a: 

A.
B.
C.
D.
Answer: A
41)   

Work done is zero when: 

A.
B.
C.
D.
Answer: A
42)   

Energy stored due to motion is called

A.
B.
C.
D.
Answer: C
43)   

The SI unit of energy is: 

A.
B.
C.
D.
Answer: B
44)   

What is the kinetic energy of a 2 kg body moving at 3 m/s? 

A.
B.
C.
D.
Answer: A
45)   

A body has maximum potential energy when: 

A.
B.
C.
D.
Answer: A
46)   

Potential energy is zero at: 

A.
B.
C.
D.
Answer: A
47)   

A 5 kg body is 2 meters above ground. PE = ? (g = 10 m/s²) 

A.
B.
C.
D.
Answer: C
48)   

If velocity is doubled, kinetic energy becomes: 

A.
B.
C.
D.
Answer: D
49)   

A boy lifts a 10 kg object to a height of 3 m. How much work is done? (g = 10 m/s²) 

A.
B.
C.
D.
Answer: B
50)   

 Force is measured in: 

A.
B.
C.
D.
Answer: C