Engineering :: Engineering Mechanics

@ : Home > Civil Engineering > Engineering Mechanics

141.

The negative acceleration is called retardation.

True

False

142.

If the body falls freely under gravity, then the gravitational acceleration is taken as

A.	Plus 8.9 m/s2	B.	? 8.9 m/s2
C.	Plus 9.8 m/s2	D.	? 9.8 m/s2

143.

If a body is thrown upwards, then the gravitational acceleration is taken as zero.

Right

Wrong

144.

If the gravitational acceleration at any place is doubled, then the weight of a body will be

A.	g / 2	B.	g
C.	?2 g	D.	2g

145.

The acceleration of a body sliding down an inclined surface is

A.	g sin ?	B.	g cos ?
C.	g tan ?	D.	none of these

146.

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

147.

Newton's second law motion

gives

does not give

148.

A science teacher claimed that Newton's third law of motion is involved while studying the motion of rockets. His statement is

justified

not justified

149.

D' Alembert's principle basically depends upon Newton's second law of motion.

Correct

Incorrect

150.

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. This statement is known as

A.	Newton's first law of motion	B.	Newton's second law of motion
C.	Newton's third law of motion	D.	none of these