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MCQ
321. A block sliding down an inclined plane has acceleration - acceleration due to gravity.
less than
greater than
same as
none of the above
322. Two force P and working in the same direction. Then the total force is
P+Q
R
P-Q
P/Q
323. The resultant of two force P & Q Such that P >Q) acting along the same straight line but in opposite direction is given by-
P+Q
P-Q
P/Q
Q/P
324. If a number of forces act simultaneously on a particle, it is possible-
not a replace them by a single force
to replace them by a single force
to replace them by a single force through CG
to replace them by a couple
325. Two non-collinear parallel equal forces acting in opposite direction-
balance each other
constitute a moment
constitute a couple
constitute a moment of couple
326. Which of the following is not a vertor quantity?
Weight
Velocity
Acceleration
Force
327. The ratio of static friction to dynamic friction Is always-
equal to one
stream line
steady
turbulent
None
The ratio of static friction to dynamic friction is always greater than one. Friction: Friction is an opposing force that comes into play when the body is actually moving (slide or roll) or even tries to move over the surface of another body. Static friction (Fs): The opposing force that is active when the body tends to move over the surface, but the actual motion is vet not started. Kinetic friction(Fk): Kinetic or dynamic force is an opposing force that is active when the body is actually moving on another surface.
328. A weight 'W' kg rest on a spring of spring constant K= 8kg/cm. The deflection of the spring due to weight is 4cm. The weight 'W' is-
16kg
32kg
64kg
128kg
W = δk = 4 x 8 = 32kg এখানে, δ = 4cm K= δ.kg/cm
329. Which of the following is a scalar quantity?
Velocity
acceleration
volume
force
330. If three forces acting in different planes can be represented by a triangle, these will be in-
non-equilibrium
partial equilibrium
full equilibrium
unpredictable
331. The resultant of two forces P and Q acting at an angle is
√P ² + Q ² + 2PQ sinθ
√P ² + Q ² + 2PQcosθ
√P ² + Q ² -2PQ sinθ
√P ² + Q ²- 2PQcosθ
332. The resultant of the following three couples 20 kg force, 0.5 m arm, + ve sense 30 kg force, 1 m arm - ve sense 40 kg force, 0.25 m arm, + ve sense having arm of 0.5 m will be-
20 kg. (-ve) sense
20 kg. (+ve) serse
10 kg. (+ve) sense
10 kg. (-ve) sense
30 ×1+R x 0.5 – 40 × 0.25 =20 x 0.5 ∴R = -20 kg
333. Which of the following is not a scalar quantity?
Time
Mass
Volume
Acceleration
334. The unit of force in SI system of units is-
Dyne
Kilogram
Newtch
Watt
335. The forces, which meet at one point, but their lines of action do not lie in a plane, are called-
coplanar non-concurrent forces
non-coplanar concurrent forces
non-coplanar non-concurrent forces
intersecting forces
336. Which of the following is the vector quantity?
Angular displacement
Angular velocity
Angular acceleration
All of these
337. The friction experience by a body, when at rest is known as-
static friction
dynamic friction
limiting friction
coefficient of friction
338. According to Lami's theorem-
three forces acting at a point will be in equilibrium
three forces acting at a point can be represented by a triangle, each side being proportional to force
if three forces acting upon a particle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium
if three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two
339. A single force and a couple acting in the same plane upon a rigid body-
balance each other
cannot balance each other
produce moment of a couple
are equivalent
340. The friction experienced by a body, when at rest, is known as-
station friction
dynamic friction
limiting friction
coefficient of friction