4

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

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

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

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

All of the above

D. All of the above

4

bh3/4

bh3/8

bh3/12

bh3/36

4

# According to Lamis theorem

The three forces must be equal

The three forces must be at 120° to each other

The three forces must be in equilibrium

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

4

Equal to

Less than

Greater than

None of these

4

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

Static friction

Dynamic friction

Limiting friction

Coefficient of friction

4

# The range of projectile (R) on an upward inclined plane is

g. cos² β/2u². sin (α + β). cos α

2u². sin (α + β). cos α/g. cos² β

g. cos² β/2u². sin (α - β). cos α

2u². sin (α - β). cos α/g. cos² β

4

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

Angle of projection

Angle of inclination of the plane

Both (A) and (B)

None of these

4

# Non-coplanar non-concurrent forces are those forces which

Meet at one point, but their lines of action do not lie on the same plane

Do not meet at one point and their lines of action do not lie on the same plane

Do not meet at one point but their lines of action lie on the same plane

None of the above

4

# One joule is equal to

0.1 N-m

1 N-m

10 N-m

100 N-m

4

Compression or tension

Buckling or shear

Shear or tension

All of the above

4

# The ratio of limiting friction and normal reaction is known as

Coefficient of friction

Angle of friction

Angle of repose

Sliding friction

4

# The total energy possessed by a system of moving bodies

Is constant at every instant

Varies from point to point

Is maximum in the start and minimum at the end

Is minimum in the start and maximum at the end

4

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

(BD³/12) - (bd³/12)

(DB³/12) - (db³/12)

(BD³/36) - (bd³/36)

(DB³/36) - (db³/36)

4

# Two bodies of masses m1 and m2 are hung from the ends of a rope, passing over a frictionless pulley as shown in the figure below. The acceleration of the string will be

g (m1 - m2)/(m1 + m2)

2g (m1 - m2)/(m1 + m2)

g (m1 + m2)/(m1 - m2)

2g (m1 + m2)/(m1 - m2)

4

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

Perfect frame

Deficient frame

Redundant frame

None of the above

4

ω.y

ω2.y

ω2/y

ω3.y

4

9 cm4

12 cm4

16 cm4

20 cm4

4

Straight line

Parabola

Hyperbola

Elliptical

4

h/2

h/3

h/4

h/6

4

P = mW - C

P = m/W + C

P = mW + C

P = C - mW

4

# If a number of forces are acting at a point, their resultant is given by

(ΣV)2 + (ΣH)2

√[(ΣV)2 + (ΣH)2]

(ΣV)2 +(ΣH)2 +2(ΣV)(ΣH)

√[(ΣV)2 +(ΣH)2 +2(ΣV)(ΣH)]

4

# The moment of a force

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

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

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

All of the above

4

# Angle of friction is the

Angle between normal reaction and the resultant of normal reaction and the limiting friction

Ratio of limiting friction and normal reaction

The ratio of minimum friction force to the friction force acting when the body is just about to move

The ratio of minimum friction force to friction force acting when the body is in motion

4

# Effect of a force on a body depends upon

Magnitude

Direction

Position or line of action

All of the above

4

6t² - 8t

3t² + 2t

6f - 8

6f - 4

4

# The coefficient of friction depends on

Area of contact

Shape of surfaces

Strength of surfaces

Nature of surface

4

# If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either

Meet in a point

Be all parallel

At least two of them must meet

All the above are correct

4

mr2/3

2mr2/3

2mr2/5

3mr2/5

4

Nine times

Six times

Four times

Two times

4

# Which of the following statement is correct?

The periodic time of a particle moving with simple harmonic motion is the time taken by a particle for one complete oscillation.

The periodic time of a particle moving with simple harmonic motion is directly proportional to its angular velocity.

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

The acceleration of the particle moving with simple harmonic motion is maximum at the mean position.