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What is the correct answer?

4

The velocity ratio in case of an inclined plane inclined at angle θ to the horizontal and weight being pulled up the inclined plane by vertical effort is

A. sinθ

B. cosθ

C. tanθ

D. cosecθ

Correct Answer :

A. sinθ


Related Questions

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4

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

A. Perfect frame

B. Deficient frame

C. Redundant frame

D. None of the above

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4

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.

A. Equal to

B. Less than

C. Greater than

D. None of these

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4

Tension in the cable supporting a lift is more when the lift is moving __________ with an acceleration.

A. Upwards

B. Downwards

C. Horizontal

D. None of these

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4

The angle between two forces when the resultant is maximum and minimum respectively are:

A. 0° and 180°

B. 180° and 0°

C. 90° and 180°

D. 90° and 0°

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4

According to Lamis theorem

A. The three forces must be equal

B. The three forces must be at 120° to each other

C. The three forces must be in equilibrium

D. If the three forces acting at a point are in equilibrium, then each force is proportional to the sine of the angle between the other two

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4

The velocity of a particle moving with simple harmonic motion is __________ at the mean position.

A. Zero

B. Minimum

C. Maximum

D. None of these

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4

The static friction

A. Bears a constant ratio to the normal reaction between the two surfaces

B. Is independent of the area of contact, between the two surfaces

C. Always acts in a direction, opposite to that in which the body tends to move

D. All of the above

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4

In ideal machines

A. Mechanical advantage is greater than velocity ratio

B. Mechanical advantage is equal to velocity ratio

C. Mechanical advantage is less than velocity ratio

D. Mechanical advantage is unity

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4

A block of mass 20 kg lying on a rough horizontal plane is connected by a light string passing over a smooth pulley to another mass 5 kg, which can move freely in the Vertical direction, as shown in the below figure. The tension in the string will __________ with the increase in coefficient of friction.

A. Increase

B. Decrease

C. Not be effected

D. None of these

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4

The bellow figure shows the three coplanar forces P, Q and R acting at a point O. If these forces are in equilibrium, then

A. P/sin β = Q/sin α = R/sin

B. P/sin α = Q/sin β = R/sin

C. P/sin = Q/sin α = R/sin β

D. P/sin α = Q/sin = R/sin β

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4

Kinetic friction is the

A. Tangent of angle between normal reaction and the resultant of normal reaction and the limiting friction

B. Ratio of limiting friction and normal reaction

C. The friction force acting when the body is just about to move

D. The friction force acting when the body is in motion

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4

The moment of inertia of a square of side a about its diagonal is

A. a2/8

B. a3/12

C. a4/12

D. a4/16

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4

The periodic time (T) is given by (where, ω = Angular velocity of particle in rad/s.)

A. ω/2π

B. 2π/ω

C. 2π × ω

D. π/ω

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4

The Cartesian equation of trajectory is (where u = Velocity of projection, α = Angle of projection, and x, y = Co-ordinates of any point on the trajectory after t seconds.)

A. y = (gx²/2u² cos²α) + x. tanα

B. y = (gx²/2u² cos²α) - x. tanα

C. y = x. tanα - (gx²/2u² cos²α)

D. y = x. tanα + (gx²/2u² cos²α)

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4

The bellow figure shows the two equal forces at right angles acting at a point. The value of force R acting along their bisector and in opposite direction is

A. P/2

B. 2P

C. √2 × P

D. P/√2

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4

The amplitude is always __________ radius of the circle.

A. Equal to

B. Less than

C. Greater than

D. None of these

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4

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

A. 30°

B. 45°

C. 60°

D. 90°

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4

According to parallel axis theorem, the moment of inertia of a section about an axis parallel to the axis through centre of gravity (i.e. IP) is given by(where, A = Area of the section, IG = Moment of inertia of the section about an axis passing through its C.G., and h = Distance between C.G. and the parallel axis.)

A. IP = IG + Ah2

B. IP = IG - Ah2

C. IP = IG / Ah2

D. IP = Ah2 / IG

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4

A body of weight W is required to move up on rough inclined plane whose angle of inclination with the horizontal is α. The effort applied parallel to the plane is given by (where μ = tanφ = Coefficient of friction between the plane and the body.)

A. P = W tanα

B. P = W tan (α + φ)

C. P = W (sinα + μcosα)

D. P = W (cosα + μsinα)

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4

One kg force is equal to

A. 7.8 N

B. 8.9 N

C. 9.8 N

D. 12 N

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4

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. P = mW - C

B. P = m/W + C

C. P = mW + C

D. P = C - mW

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4

A semicircular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi circular disc and horizontal surface is μ. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will

A. Remain horizontal

B. Slant up towards direction of pull

C. Slant down towards direction of pull

D. None of the above

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4

The C.G. of a solid hemisphere lies on the central radius 3r

A. At distance from the plane base 3r

B. At distance from the plane base 3r

C. At distance from the plane base 3r

D. At distance from the plane base

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4

The friction experienced by a body, when in motion, is known as

A. Rolling friction

B. Dynamic friction

C. Limiting friction

D. Static friction

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4

The resultant of two forces P and Q acting at an angle θ is

A. √(P² + Q² + 2PQ sinθ)

B. √(P² + Q² + 2PQ cosθ)

C. √(P² + Q² - 2PQ cosθ)

D. √(P² + Q² - 2PQ tanθ)

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4

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

A. Reversible machine

B. Non-reversible machine

C. Neither reversible nor non-reversible machine

D. Ideal machine

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4

The time of flight of a projectile on downward inclined plane depends upon

A. Angle of projection

B. Angle of inclination of the plane

C. Both (A) and (B)

D. None of these

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4

The moment of the force P about O as shown in the below figure is

A. P × OA

B. P × OB

C. P × OC

D. P × AC

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4

The coefficient of restitution for inelastic bodies is

A. Zero

B. One

C. Between zero and one

D. More than one

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4

A framed structure is perfect, if the number of members are __________ (2j - 3), where j is the number of joints.

A. Equal to

B. Less than

C. Greater than

D. None of these