Mechanical Engineering

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.

Question: In a framed structure, as shown in the below figure, the forces in the members AB and BC are respectively
[A].

(tensile) and 2W (compressive)

[B].

2W(tensile) and (compressive)

[C].

(tensile) and (compressive)

[D].

none of the above

Answer: Option A

Explanation:

No answer description available for this question.

Question: In a framed structure, as shown in the below figure, the force in the member CD is tensile in nature.
[A].

Agree

[B].

Disagree

Answer: Option A

Explanation:

No answer description available for this question.

Question: In a framed structure, as shown in the below figure, the force in the member AB is __________ the force in member AC.
[A].

half

[B].

equal to

[C].

double

Answer: Option A

Explanation:

No answer description available for this question.