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Current Affairs January 2024

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4

The skidding away of the vehicle on a level circular path can be avoided if the force of friction between the wheels and the ground is __________ the centrifugal force.

A. Less than

B. Greater than

C. Equal to

D. None of these

Correct Answer :

B. Greater than


Related Questions

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4

The coefficient of friction depends on

A. Area of contact

B. Shape of surfaces

C. Strength of surfaces

D. Nature of surface

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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 algebraic sum of moments of the forces forming couple about any point in their plane is

A. Equal to the moment of the couple

B. Constant

C. Both of above are correct

D. Both of above are wrong

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4

A body will begin to move down an inclined plane if the angle of inclination of the plane is _________ the angle of friction.

A. Equal to

B. Less than

C. Greater than

D. None of these

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4

The moment of inertia of a solid cylinder of mass m, radius r and length l about the longitudinal axis or polar axis is

A. mr2/2

B. mr2/4

C. mr2/6

D. mr2/8

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4

The units of moment of inertia of an area are

A. kg-m²

B. m⁴

C. kg/m²

D.

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4

The maximum velocity of a particle moving with simple harmonic motion is

A. ω

B. ωr

C. ω2r

D. ω/r

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4

For a self locking machine, the efficiency must be

A. Equal to 50 %

B. Less than 50 %

C. Greater than 50 %

D. 100 %

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4

When trying to turn a key into a lock, following is applied

A. Coplanar force

B. Non-coplanar forces

C. Moment

D. Couple

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4

Which of the following is a scalar quantity?

A. Force

B. Speed

C. Velocity

D. Acceleration

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4

The power developed by a body acted upon by a torque T Newton metre (N - m) and revolving at ω radian/s is given by

A. T.ω (in watts)

B. T.ω/60 (in watts)

C. T.ω/75 (in kilowatts)

D. T.ω/4500 (in kilowatts)

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4

A rubber ball is dropped from a height of 2 m. If there is no loss of velocity after rebounding, the ball will rise to a height of

A. 1 m

B. 2 m

C. 3 m

D. 4 m

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4

If a number of forces act simultaneously on a particle, it is possible

A. Not a replace them by a single force

B. To replace them by a single force

C. To replace them by a single force through C.G.

D. To replace them by a couple

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4

Centre of gravity of a solid cone lies on the axis at the height

A. One fourth of the total height above base

B. One third of the total height above base

C. One-half of the total height above base

D. Three eighth of the total height above the base

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4

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

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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

Which of the following statement is correct in connection with projectiles?

A. A path, traced by a projectile in the space, is known as trajectory.

B. The velocity, with which a projectile is projected, is known as the velocity of projection.

C. The angle, with the horizontal, at which a projectile is projected, is known as angle of projection.

D. All of the above

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4

The range of projectile on a downward inclined plane is ________ the range on upward inclined plane for the same velocity of projection and angle of projection.

A. Less than

B. More than

C. Equal to

D. None of These

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4

The moment of inertia of a square of side (a) about an axis through its centre of gravity is

A. a4/4

B. a4/8

C. a4/12

D. a4/36

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4

The velocity ratio of a differential wheel and axle with D as the diameter of effort wheel and d1 and d2 as the diameters of larger and smaller axles respectively, is

A. D/(d₁ + d₂)

B. D/(d₁ - d₂)

C. 2D/(d₁ + d₂)

D. 2D/(d₁ - d₂)

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4

The maximum height of a projectile on a horizontal plane, is

A. u² sin²α/2g

B. u² cos²α/2g

C. u² sin²α/g

D. u² cos²α/g

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4

The forces which meet at one point, but their lines of action __________ on the same plane, are Known as non-coplanar concurrent forces.

A. Lie

B. Do not lie

C. Either A or B

D. None of these

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4

When a body of mass m attains a velocity v from rest in time t, then the kinetic energy of translation is

A. mv2

B. mgv2

C. 0.5 mv2

D. 0.5 mgv2

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4

Which of the following is not the unit of distance?

A. Angstrom

B. Light year

C. Micron

D. Milestone

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4

Two blocks A and B of masses 150 kg and 50 kg respectively are connected by means of a string as shown in the below figure. The tension in all the three strings __________ be same.

A. Will

B. Will not

C. Either A or B

D. None of these

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4

The total energy possessed by a system of moving bodies

A. Is constant at every instant

B. Varies from point to point

C. Is maximum in the start and minimum at the end

D. Is minimum in the start and maximum at the end

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4

Which one of the following statements is not correct?

A. The tangent of the angle of friction is equal to coefficient of friction

B. The angle of repose is equal to angle of friction

C. The tangent of the angle of repose is equal to coefficient of friction

D. The sine of the angle of repose is equal to coefficient to friction

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4

Coefficient of friction is the

A. 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

Coulomb friction is the friction between

A. Bodies having relative motion

B. Two dry surfaces

C. Two lubricated surfaces

D. Solids and liquids

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4

The motion of a wheel of a car is

A. Purely translation

B. Purely rotational

C. Combined translation and rotational

D. None of these