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4

If a body is acted upon by a number of coplanar non-concurrent forces, it may

A. Rotate about itself without moving

B. Move in any one direction rotating about itself

C. Be completely at rest

D. All of these

Correct Answer :

D. All of these


Related Questions

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4

If a body is acted upon by a number of coplanar non-concurrent forces, it may

A. Rotate about itself without moving

B. Move in any one direction rotating about itself

C. Be completely at rest

D. All of these

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4

Moment of inertia of a hollow circular section, as shown in the below figure about an axis perpendicular to the section, is __________ than that about X-X axis.

A. Two times

B. Same

C. Half

D. None of these

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4

Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the balls with velocity v is made to strike the second ball. Both the balls after impact will move with a velocity

A. v

B. v/2

C. v/4

D. v/8

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4

The wheels of a moving car possess

A. Potential energy only

B. Kinetic energy of translation only

C. Kinetic energy of rotation only

D. Kinetic energy of translation and rotation both

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4

The rate of change of displacement of a body is called

A. Velocity

B. Acceleration

C. Momentum

D. None of these

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4

The resultant of the two forces P and Q is R. If Q is doubled, the new resultant is perpendicular to P. Then

A. P = Q

B. Q = R

C. Q = 2R

D. None of these

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4

The time of flight (t) of a projectile on a horizontal plane is given by

A. t = 2u. sinα/g

B. t = 2u. cosα/g

C. t = 2u. tanα/g

D. t = 2u/g.sinα

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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

The force induced in the string AB due to the load W, as shown in the below figure is

A. W sinθ

B. W cosθ

C. W secθ

D. W cosecθ

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4

The necessary condition for forces to be in equilibrium is that these should be

A. Coplanar

B. Meet at one point

C. Both (A) and (B) above

D. All be equal

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4

Moment of inertia of a hollow rectangular section as shown in the below figure about X-X axis, is

A. (BD³/12) - (bd³/12)

B. (DB³/12) - (db³/12)

C. (BD³/36) - (bd³/36)

D. (DB³/36) - (db³/36)

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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 centre of percussion is below the centre of gravity of the body and is at a distance equal to

A. h/kG

B. h2/kG

C. kG2/h

D. h × kG

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4

The maximum frictional force which comes into play when a body just begins to slide over another surface is called

A. Limiting friction

B. Sliding friction

C. Rolling friction

D. Kinematic friction

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4

Coplanar non-concurrent forces are those forces which __________ at one point, but their lines of action lie on the same plane.

A. Meet

B. Do not meet

C. Either A or B

D. None of these

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4

In the shown figure, the tension (T) in the string will be

A. m₁. m₂. g/(m₁ + m₂)

B. 2m₁. m₂. g/(m₁ + m₂)

C. (m₁ + m₂)/ m₁. m₂. g

D. (m₁ + m₂)/2m₁. m₂. g

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4

The friction experienced by a body, when at rest, is known as

A. Static friction

B. Dynamic friction

C. Limiting friction

D. Coefficient of friction

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4

A lead ball with a certain velocity is made to strike a wall, it falls down, but rubber ball of same mass and with same velocity strikes the same wall, it rebounds. Select the correct reason from the following:

A. Both the balls undergo an equal change in momentum

B. The change in momentum suffered by rubber ball is more than the lead ball

C. The change in momentum suffered by rubber ball is less than the lead ball

D. None of the above

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4

Dynamic friction as compared to static friction is

A. Same

B. More

C. Less

D. May be less of more depending on nature of surfaces and velocity

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4

Moment of inertia of a circular section about its diameter (d) is

A. πd3/16

B. πd3/32

C. πd4/32

D. πd4/64

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4

Mass moment of inertia of a thin rod about its one end is __________ the mass moment of inertia of the same rod about its midpoint

A. Same as

B. Twice

C. Thrice

D. Four times

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4

If n = number of members and y = number of joints, then for a perfect frame, n = ?

A. 1/2

B. 2/3

C. 3/2

D. 2/4

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4

One joule means that

A. Work is done by a force of 1 N when it displaces a body through 1 m

B. Work is done by a force of 1 kg when it displaces a body through 1 m

C. Work is done by a force of 1 dyne when it displaces a body through 1 cm

D. Work is done by a force of 1 g when it displaces a body through 1 cm

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4

Which of the following is not a vector quantity?

A. Weight

B. Velocity

C. Acceleration

D. Force

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4

A framed structure is imperfect, if the numbers of members are __________ (2j - 3).

A. Equal to

B. Less than

C. Greater than

D. Either (B) or (C)

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4

Which of the following statement is correct?

A. The algebraic sum of the forces, constituting the couple is zero

B. The algebraic sum of the forces, constituting the couple, about any point is the same

C. A couple cannot be balanced by a single force but can be balanced only by a couple of opposite sense

D. All of the above

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4

The unit of work in S.I. units is

A. Newton

B. erg

C. kg-m

D. joule

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4

A machine having an efficiency less 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 moment of a force

A. Is the turning effect produced by a force, on the body, on which it acts

B. Is equal to the product of force acting on the body and the perpendicular distance of a point and the line of action of the force

C. Is equal to twice the area of the triangle, whose base is the line representing the force and whose vertex is the point, about which the moment is taken

D. All of the above

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4

If rain is falling in the opposite direction of the movement of a pedestrian, he has to hold his umbrella

A. More inclined when moving

B. Less inclined when moving

C. More inclined when standing

D. Less inclined when standing