Two forces are acting at an angle of 120°. The bigger force is 40 N and the resultant is perpendicular to the smaller one. The smaller force is

Question

Two forces are acting at an angle of 120°. The bigger force is 40 N and the resultant is perpendicular to the smaller one. The smaller force is

A. 20 N

B. 40 N

C. 120 N

Correct Answer :

A. 20 N

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The velocity ratio of a first system of pulleys with 4 pulleys is

A. 4

B. 8

C. 16

D. 20

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The force required to move the body up the plane will be minimum if it makes an angle with the inclined plane __________ the angle of friction.

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If two bodies having masses m₁ and m₂ (m₁>m₂) have equal kinetic energies, the momentum of body having mass m₁ is _________ the momentum of body having mass m₂.

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The mechanical advantage of a lifting machine is the ratio of

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In a framed structure, as shown in the below figure, the force in the member BC is

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The maximum efficiency of a lifting machine is

A. 1/m

B. V.R./m

C. m/V.R.

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A framed structure, as shown in the below figure, is a

Discuss this answer

A redundant frame is also called __________ frame.

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Coulomb friction is the friction between

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The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction in which the force acts. This statement is known as

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The motion of a wheel of a car is

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The term 'Centroid' is

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The maximum efficiency of a screw jack is

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The resultant of two equal forces P making an angle θ, is given by

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The law of the machine is (where P = Effort applied to lift the load, m = A constant which is equal to the slope of the line, W = Load lifted, and C = Another constant which represents the machine friction.)

Discuss this answer

A trolley wire weighs 1.2 kg per meter length. The ends of the wire are attached to two poles 20 meters apart. If the horizontal tension is 1500 kg find the dip in the middle of the span

A. 2.5 cm

B. 3.0 cm

C. 4.0 cm

D. 5.0 cm

Discuss this answer

The frequency of oscillation of a compound pendulum is (where kG = Radius of gyration about the centroidal axis, and h = Distance between the point of suspension and C.G. of the body.)

Discuss this answer

The range of a projectile is maximum, when the angle of projection is

A. 30°

B. 45°

C. 60°

D. 90°

Discuss this answer

One watt is equal to

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A projectile is fired at an angle θ to the vertical. Its horizontal range will be maximum when θ is

A. 0°

B. 30°

C. 45°

D. 60°

Discuss this answer

The total momentum of a system of masses (i. e. moving bodies) in any one direction remains constant, unless acted upon by an external force in that direction. This statement is called

Discuss this answer

A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to

A. 25

B. 50

C. 100

D. 250

Discuss this answer

A machine having an efficiency greater than 50%, is known as

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One kg force is equal to

A. 7.8 N

B. 8.9 N

C. 9.8 N

D. 12 N

Discuss this answer

The motion of a particle round a fixed axis is

B. Rotary

Discuss this answer

The resultant of two forces P and Q (such that P > Q) acting along the same straight line, but in opposite direction, is given by

A. P + Q

B. P - Q

C. P / Q

D. Q / P

Discuss this answer

The forces, which meet at one point, but their lines of action do not lie in a plane, are called

Discuss this answer

The ratio of static friction to dynamic friction is always

Discuss this answer

The centre of percussion of a solid cylinder of radius r resting on a horizontal plane will be

A. r/2

B. 2r/3

C. r/A

D. 3r/2

Discuss this answer

Answer 1

D. None of these

Answer 2

A. Equal to

Answer 3

B. Less than

Answer 4

C. Greater than

Answer 5

D. None of these

Answer 6

A. Concurrence of the medians

Answer 7

B. Intersection of its altitudes

Answer 8

C. Intersection of bisector of angles

Answer 9

D. Intersection of diagonals

Answer 10

A. Equal to

Answer 11

B. Less than

Answer 12

C. Greater than

Answer 13

D. None of these

Answer 14

A. Distance moved by effort to the distance moved by load

Answer 15

B. Load lifted to the effort applied

Answer 16

C. Output to the input

Answer 17

D. All of the above

Answer 18

A. W/√3 (compression)

Answer 19

B. W/√3 (tension)

Answer 20

C. 2W/√3 (compression)

Answer 21

D. 2W/√3 (tension)

Answer 22

D. 1/(m × V.R.)

Answer 23

A. Perfect frame

Answer 24

B. Deficient frame

Answer 25

C. Redundant frame

Answer 26

D. None of the above

Answer 27

A. Perfect

Answer 28

B. Imperfect

Answer 29

C. Deficient

Answer 30

D. None of these

Answer 31

A. Bodies having relative motion

Answer 32

B. Two dry surfaces

Answer 33

C. Two lubricated surfaces

Answer 34

D. Solids and liquids

Answer 35

A. Newton's first law of motion

Answer 36

B. Newton's second law of motion

Answer 37

C. Newton's third law of motion

Answer 38

D. None of these

Answer 39

A. Purely translation

Answer 40

B. Purely rotational

Answer 41

C. Combined translation and rotational

Answer 42

D. None of these

Answer 43

A. The same as centre of gravity

Answer 44

B. The point of suspension

Answer 45

C. The point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis

Answer 46

D. None of the above

Answer 47

A. (1 - sinφ)/(1 + sinφ)

Answer 48

B. (1 + sinφ)/(1 - sinφ)

Answer 49

C. (1 - tanφ)/(1 + tanφ)

Answer 50

D. (1 + tanφ)/(1 - tanφ)

Answer 51

A. 2P sinθ/2

Answer 52

B. 2P cosθ/2

Answer 53

C. 2P tanθ/2

Answer 54

D. 2P cotθ/2

Answer 55

A. P = mW - C

Answer 56

B. P = m/W + C

Answer 57

C. P = mW + C

Answer 58

D. P = C - mW

Answer 59

A. 2π. √(gh/kG² + h²)

Answer 60

B. 2π. √(kG² + h²/gh)

Answer 61

C. 1/2π. √(gh/kG² + h²)

Answer 62

D. 1/2π. √(kG² + h²/gh)

Answer 63

A. 0.1 joule/s

Answer 64

B. 1 joule/s

Answer 65

C. 10 joules/s

Answer 66

D. 100 joules/s

Answer 67

A. Newton's first law of motion

Answer 68

B. Newton's second law of motion

Answer 69

C. Principle of conservation of energy

Answer 70

D. Principle of conservation of momentum

Answer 71

A. Reversible machine

Answer 72

B. Non-reversible machine

Answer 73

C. Neither reversible nor non-reversible machine

Answer 74

D. Ideal machine

Answer 75

A. Translatory

Answer 76

C. Circular

Answer 77

D. Translatory as well as rotary

Answer 78

A. Coplanar non-concurrent forces

Answer 79

B. Non-coplanar concurrent forces

Answer 80

C. Non-coplanar non-concurrent forces

Answer 81

D. Intersecting forces

Answer 82

A. Equal to one

Answer 83

B. Less than one

Answer 84

C. Greater than one

Answer 85

D. None of these

Two forces are acting at an angle of 120°. The bigger force is 40 N and the resultant is perpendicular to the smaller one. The smaller force is

Correct Answer :

Show all Engineering Mechanics MCQ

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Also checkout

Two forces are acting at an angle of 120°. The bigger force is 40 N and the resultant is perpendicular to the smaller one. The smaller force is

Correct Answer :

Show all Engineering Mechanics MCQ

Related Questions

The velocity ratio of a first system of pulleys with 4 pulleys is

The force required to move the body up the plane will be minimum if it makes an angle with the inclined plane __________ the angle of friction.

The centre of gravity of a triangle lies at the point of

If two bodies having masses m1 and m2 (m1>m2) have equal kinetic energies, the momentum of body having mass m1 is _________ the momentum of body having mass m2.

The mechanical advantage of a lifting machine is the ratio of

In a framed structure, as shown in the below figure, the force in the member BC is

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A framed structure, as shown in the below figure, is a

A redundant frame is also called __________ frame.

Coulomb friction is the friction between

The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction in which the force acts. This statement is known as

The motion of a wheel of a car is

The term 'Centroid' is

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The law of the machine is (where P = Effort applied to lift the load, m = A constant which is equal to the slope of the line, W = Load lifted, and C = Another constant which represents the machine friction.)

A trolley wire weighs 1.2 kg per meter length. The ends of the wire are attached to two poles 20 meters apart. If the horizontal tension is 1500 kg find the dip in the middle of the span

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