Engineering Mechanics

Question: If a number of forces are acting at a point, their resultant is given by
[A].

(∑V)2 + (∑H)2

[B].

[C].

(∑V)2 +(∑H)2 +2(∑V)(∑H)

[D].

Answer: Option B

Explanation:

No answer description available for this question.

Question: If P is the force acting on the body, m is the mass of the body and a is the acceleration of the body, then according to Newton’s second law of motion,
[A].

P + m.a = 0

[B].

P – m.a = 0

[C].

P x m.a = 0

[D].

P/m.a = 0

Answer: Option B

Explanation:

No answer description available for this question.

Question: D’ Alembert’s principle basically depends upon Newton’s second law of motion.
[A].

Correct

[B].

Incorrect

Answer: Option A

Explanation:

No answer description available for this question.

Question: A science teacher claimed that Newton’s third law of motion is involved while studying the motion of rockets. His statement is
[A].

justified

[B].

not justified

Answer: Option A

Explanation:

No answer description available for this question.

Question: Newton’s second law motion __________ a relation between force and mass of a moving body.
[A].

gives

[B].

does not give

Answer: Option A

Explanation:

No answer description available for this question.

Question: According to Newton’s first law of motion,
[A].

every body continues in its state of rest or of uniform motion, in a straight line, unless it is acted upon by some external force

[B].

the rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts

[C].

to every action, there is always an equal and opposite reaction

[D].

none of the above

Answer: Option A

Explanation:

No answer description available for this question.

Question: A number of forces acting at a point will be in equilibrium, if
[A].

all the forces are equally inclined

[B].

sum of all the forces is zero

[C].

sumof resolved parts in the vertical direction is zero (i.e. ∑V = 0)

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: If the gravitational acceleration at any place is doubled, then the weight of a body will be
[A].

g/2

[B].

g

[C].

2g

[D].

2g

Answer: Option D

Explanation:

No answer description available for this question.

Question: If a body is thrown upwards, then the gravitational acceleration is taken as zero.
[A].

Correct

[B].

Incorrect

Answer: Option B

Explanation:

No answer description available for this question.

Question: If the body falls freely under gravity, then the gravitational acceleration is taken as
[A].

+8.9 m/s2

[B].

-8.9 m/s2

[C].

+9.8 m/s2

[D].

-9.8 m/s2

Answer: Option C

Explanation:

No answer description available for this question.